Embed Size (px)
Citation preview
Floods of July 18-20, 1996, in Northern Illinois
By Robert R. Holmes, Jr., and Amanda L. Kupka
U.S. GEOLOGICAL SURVEY
Open-File Report 97-425
Prepared in cooperation with the
ILLINOIS DEPARTMENT OF NATURAL RESOURCES, OFFICE OF WATER RESOURCES
Urbana, Illinois 1997
U.S. DEPARTMENT OF THE INTERIOR BRUCE BABBITT, Secretary
U.S. GEOLOGICAL SURVEY
Mark Schaefer, Acting Director
The use of firm, trade, and brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey
For additional information write to:
District Chief U.S. Geological Survey 221 North Broadway Avenue Urbana, Illinois 61801
Copies of this report can be purchased from:
U.S. Geological Survey Branch of Information Services Box 25286 Federal Center Denver, CO 80225
CONTENTS
Abstract.................................................................................................................................................................................. 1Introduction........................................................................................................................................................................... 1Rood of July 18-20, 1996..................................................^ 1
Meteorological Setting................................................................................................................................................ 1Storm Rainfall.............................................................................................................................................................. 2Hooding....................................................................................................................................................................... 2
Summary................................................................................................................................................................................ 2References..........................................................................................................................._^ 25Appendix 1 ........................................................................................................................................................................... 29
PLATE
[Plate is in pocket]
1. Rain-gage locations, point-rainfall observations, rainfall isohyets, U.S. Geological Survey streamflow-gaging station locations, and flood-frequency estimates in the northern Illinois flood area
FIGURES
1. Map showing point-rainfall observations and Illinois State Water Survey rainfall isohyets in the northernIllinois flood area........................................................................................................................................................ 3
2. Photographs showing aerial views of flooding in Kane County, 111........................................................................... 53. Graph showing cumulative rainfall amounts from midnight July 17, 1996, at selected U.S. Geological Survey
rain gages in the northern Illinois flood area.............................................................................................................. 114. Map showing U.S. Geological Survey streamflow-gaging stations in the northern Illinois flood area...................... 125. Graph showing flood-discharge hydrographs for selected U.S. Geological Survey streamflow-gaging stations
in the northern Illinois flood area................................................................................................................................ 24
TABLES
1. Rainfall data for a 24-hour period at selected rain gages in northern Illinois, July 17-18, 1996........................... 72. Peak-flow data at selected U.S. Geological Survey streamflow-gaging stations in the northern Illinois
flood area................................................................................................................................................................. 153. High water marks from Illinois Department of Natural Resources crest-stage gages in the northern
Illinois flood area..................................................................................................................................................... 18
Contents
CONVERSION FACTORS
Multiply By To obtain
Length
inch (in.) foot (ft)
square mile (mi2)
2.54 0.3048 2.590
centimeter meter square kilometer
Flow rate
cubic foot per second (ft3/s) 0.02832 cubic meter per second
Sea level: In this report, "sea level" refers to the National Geodetic Vertical Datum of 1929 (NGVD of 1929) a geodetic datum derived from a general adjustment of the first-order level nets of both the United States and Canada, formerly called Sea Level Datum of 1929.
IV Contents
Floods of July 18-20, 1996, in Northern Illinoisby Robert R. Holmes, Jr., and Amanda L. Kupka
ABSTRACT
Record flooding occurred on many streams in northern Illinois during July 18-20,1996. Over 16 inches of rain fell at some locations during and just prior to this period. Peak of record discharges were recorded at 19 U.S. Geological Survey (USGS) streamflow-gaging stations. The USGS, in cooperation with the Illinois Department of Natural Resources, Office of Water Resources (IDNROWR), has compiled the available hydro- logic data from the July 1996 flood in northern Illinois, and the data are presented in this report.
INTRODUCTION
Record rainfall amounts over 16 in. were reported for the 24-hour period ending at 7:00 a.m. on July 18, 1996, in northern Illinois. These amounts resulted from several subsequent thunderstorms track ing along the same west to east stalled low-pressure front. This rainfall produced record flooding in highly urbanized northern Illinois (fig. 1) from July 18 through July 20, 1996. This flooding caused hundreds of millions of dollars worth of damage and two deaths (Chicago Tribune, July 21 and July 26, 1996). Numer ous houses were inundated (fig. 2), and roadway infra structure in the area was damaged as many roads and bridges were washed out. Three dams in the region experienced complete failure, whereas numerous other dams were overtopped experiencing varying degrees of damage. Illinois Governor Jim Edgar declared 15 northern Illinois counties State disaster areas, followed
by a Federal disaster declaration of 11 Illinois counties by President Bill Clinton.
Because of the extreme nature of this flood, documenting and archiving the data collected during this flood are valuable for future engineering, environ mental, and hydrologic studies. Various Federal and State agencies collected hydrologic data in the flood area. The U.S. Geological Survey (USGS), in coopera tion with the Illinois Department of Natural Resources, Office of Water Resources (IDNROWR), has compiled the available data from the July 18-20,1996, flood in northern Illinois. The purpose of this report is to document and present these data.
FLOOD OF JULY 18-20,1996
Meteorological Setting
Beginning midmorning on July 17,1996, a slow moving low-pressure system stalled over northern Illinois (fig. 1). Because abundant moisture from the Gulf of Mexico was available in the upper atmosphere, convective heating by the sun caused atmospheric instability over the area. Over the next 24 hours, winds at the 10,000-20,000 feet level running parallel to the front along a west to east track was the mechanism for channeling each developing thunderstorm along the same track, roughly from Rockford to Joliet, 111. This effect has been referred to as the "train echo." This weather system caused appreciable rainfall along the storm track. Chagnon (1997) gives a more detailed discussion of the meteorological setting for this flood event.
Introduction
Storm Rainfall
Rainfall amounts were heaviest in Du Page, Kane, Kendall, and Will Counties: the National Weather Service (NWS) rain gage in Aurora officially recording 16.91 in. This amount is a new State of Illinois record for 24-hour rainfall, surpassing the former record of 16.64 in. officially recorded in East St. Louis in southwestern Illinois in 1957. Based on Bulletin 70 (Huff and Angel, 1989), recurrence intervals of greater than 100 years were estimated for long-term NWS rain gages at De Kalb (8.09 in.) and Aurora (16.91 in.). The observations of point rainfall from 117 locations were recorded by NWS, USGS, Illinois State Water Survey (ISWS), and other local agency rain gages in the flood area listed in table 1. Point-rainfall observations and isohyets of rainfall, modified from Chagnon (1997), are shown in figure 1. The isohyets of rainfall were drawn based on weather radar data and from observations of point rainfall recorded at rain gages. The larger amounts of rain fell along a line from Rockford to Joliet, coinciding with the stalled low-pressure front.
The time distribution of rainfall was nonuniform during the period because rain fell during scattered thunderstorms. The time distribution of rainfall meas ured at two USGS continuous tipping-bucket rain gages, Du Page County Airport near St. Charles, 111. (415457088150600, map reference number R87), and Sawmill Creek near Lemont, 111. (05533400, map reference number R102), are shown in figure 3. The digital time-series rainfall data (in 5-, 15-, or 60-minute increments) for all USGS and ISWS rain gages in the study area are given in appendix 1. The rainfall data presented in this report are the recorded values from the rain gage and have had no corrections applied for intense rainfall.
Flooding
Large amounts of rain fell in some of the most heavily urbanized areas in Illinois. Urbanization tends to worsen flooding during rainstorms because the amount of pervious surfaces to absorb rainfall is decreased. The USGS operates over 65 continuous- recording streamflow-gaging stations in northern Illinois (fig. 4) to address flooding problems in this area. The runoff from this rainfall produced record flood discharges at 19 USGS streamflow-gaging stations (table 2), with near record discharges at several
more stations. IDNROWR operated 6 continuous- recording stage gages and 60 crest-stage gages in the flood area. The crest-stage gages record only the peak stage (elevation) of the stream. The digital-time series (in 15-minute increments) of discharge and(or) stage for all USGS and IDNROWR gages are listed in appendix 1. Peak stage data for the IDNROWR crest-stage gages in the flood area are listed in table 3.
Using methods outlined in Bulletin 17B (Hydrology Subcommittee of Interagency Advisory Committee on Water Data, 1982), a Log Pearson Type III distribution was fit to the annual peak data set for each USGS continuous streamflow-gaging station to obtain the flood-frequency estimates. Where appli cable, using the weighting scheme recommended in Curtis (1987, p. 4), the station frequency estimates were weighted with the regional flood-frequency estimates of Curtis (1987) to produce the flood- frequency estimates for each station. Eleven stations had peak discharges that were greater than the 100-year flood discharge, which is defined as the discharge with a 1-percent chance of occurrence in any one year. The frequency estimate for each station, peak discharge, and stage are listed in table 2.
The discharge peaks for the streams and rivers in the flood area occurred anywhere from a few hours to a day after the rainfall, depending on the size of the stream. Discharge hydrographs for five selected streamflow-gaging stations in the flood area are shown in figure 5.
Most of the available hydrologic data collected in the flood area are shown on plate 1. The data include rain-gage locations, point-rainfall observations and isohyets, USGS streamflow-gaging station locations, and flood-frequency information.
SUMMARY
Record flooding occurred on many streams in northern Illinois during July 18-20, 1996. This flooding was caused by record rainfall from several subsequent thunderstorms tracking along the same west to east stalled low-pressure front. A new State of Illinois 24-hour record rainfall of 16.91 in. was recorded at Aurora. The National Weather Service rain gages at Aurora and De Kalb had frequency estimates greater than the 100-year recurrence interval. Peaks of record were recorded at 19 U.S. Geological Survey streamflow-gaging stations. Peak discharges in excess
Floods of July 18-20,1996, in Northern Illinois
GO O
GO O
I
F D ^
P!
3 m,
co m
§?CD 33
m x-o
o
Figure 1. Point-rainfall observations and Illinois State Water Survey rainfall isohyets in the northern Illinois flood area.
Figu
re 2
. A
eria
l vie
ws
of fl
oodi
ng in
Kan
e C
ount
y, I
II. (
cour
tesy
of P
aul S
huch
, K
ane
Cou
nty
Dev
elop
men
t D
epar
tmen
t).
Ui
Figu
re 2
. A
eria
l vie
ws
of fl
oodi
ng in
Kan
e C
ount
y, I
II. (
cour
tesy
of P
aul S
huch
, K
ane
Cou
nty
Dev
elop
men
t D
epar
tmen
t) C
ontin
ued.
Tabl
e 1.
R
ainf
all d
ata
for
a 24
-hou
r pe
riod
at s
elec
ted
rain
gag
es in
nor
ther
n Ill
inoi
s, J
uly
17-1
8,19
96
[NW
S, N
atio
nal
Wea
ther
Ser
vice
; ~ n
ot a
vaila
ble;
>, g
reat
er th
an; N
/A, n
ot a
pplic
able
; <, l
ess
than
; ISW
S, I
llino
is S
tate
Wat
er S
urve
y; U
SGS,
U.S
. Geo
logi
cal S
urve
y; M
ISC
, mis
cella
neou
s;
IDN
RO
WR
, Ill
inoi
s D
epar
tmen
t of N
atur
al R
esou
rces
, Off
ice
of W
ater
Res
ourc
es]
c 3 3 Q> -J
Map
re
fer
en
ce
num
ber
(see
fig.
1
and
pl.1
)
I R
lR
2R3 R
4I
R5 R6
: R
7 R8
R9
RIO Rll
R12
R13
R14
R15
R16
.,; R
17R
18 R19
R20
: R2
1:
R22
R23 R24
R25
R26
R27
R28
R29
R30
R31
R32
R33
R34
R35
R36
Stat
ion
num
ber
1101
4611
0203
1103
3811
0442
1105
83N
/A11
0803
1114
2011
1447
1114
5511
1577
""""
1115
4911
1835
1121
7811
2223
1123
4811
2500
1127
3611
2763
1128
3011
3738
1137
82N
/A11
4530
1146
0311
4837
1149
231 L
5059
1151
1011
5326
1153
7211
5493
1157
5811
5763
1158
2511
6490
Stat
ion
nam
eA
mbo
y ''""'"
'fcW
:i"is*:"
<i;'"ii
;* *MI
*
Ant
ioch
Aur
ora
" "" "
"^"ws
M* *a d
ftii
i.'.'
j.#>;
j
Bar
ringt
on 3
Sou
thw
est
Belv
ider
e 1 N
orth
Bot
anic
Gar
dens
Gle
ncoe
Bou
rbon
nais
3 N
orth
wes
tC
hann
ahon
Dre
sden
Isl
and
Cha
tsw
orth
Che
bans
eC
hica
go M
idw
ay"
'""" '
"''"'"'*
Chi
cago
O'H
are
Com
pton
1 N
orth
wes
tD
ayto
nD
eKal
b '*
^D
ixon
1 N
orth
wes
tD
wig
ht
"'''""""
"*
"!"5::
Elgi
nEl
k G
rove
Vill
age
Fire
hous
e"""
""'"
Elw
ood
8 N
orth
wes
t (Jo
liet J
unio
r Col
lege
)G
umee
Pub
lic W
orks
Ham
pshi
re 8
Sou
thea
stH
arva
rd
_ ~
j^
_Jo
liet B
rand
on R
oad
Dam
Kan
kake
e 'M
etro
Was
tew
ater
Lake
Vill
a 2
Nor
thea
stLa
Sal
le 1
Sou
th
8*^
Libe
rtyvi
lleLi
ttle
Red
Sch
ool (
Will
ow S
prin
gs)
m "
""M
aren
goM
arse
illes
Loc
k '
" '*
i"BMJK
im---
McH
enry
W.G
. Stra
tton
Lock
& D
amM
omen
ce .
*..
..,x
'* 1
m .
.....H
Vfat
......
SS
S Si
ii'S
Mon
ee R
eser
voir
Mor
ris 1
Nor
thw
est "
"JJ^
Ore
gon
2 Ea
st
Dat
a-
colle
ctio
n ag
ency
..... ^ ..
..
mf$
,,,
,...
j^y<
.w
m
SSS*
H
* «.
,, j^yg
NW
S' ""
" N
WS
'""**
"*""
"""* N
WS
"""""
~ "
""N
WS
" """'
"
NW
SN
WS
NW
S """
" '
msBi?!
i:"siiii;
,NW
S
NW
ST
""" "
"" -N
WS
NW
SN
WS
'"'"-
NW
Srf
ttH
MM
'
:NW
S
IS
"" N
WS
"i"°:"1"
"'S!lSi:::
:'mB!!!"
< ,.N
WS
mff"
NW
S"""
"'"
"ISNWS
-.......,;"
NW
Sw
!;'''
1'""
""
" '.N
WS
NW
S«i
!Si!!
iSS5
*BS
SS
SS
S
\T
\V
?
^8S
"
"**
"" N
WS
",,,
,sZ
~^
,,,-NW
St*N
WS
'"""^
IL"
'*""
""'~
.NW
S '""
'"T8
NW
Sm
'
.:W
-
' "
" j^
^g
-'S
W '-
,,,,,,,,,.
^.w
s
* TZ, ~
!*!i M
sf Bi "NW
S^M
WMWMhM
,,,,,,
Nws .,
,,.....
..x,.,.
.. ,,,^
^,,^.,
,,,.,,.,
!}«
^ys
NW
S
Lat
itude
41«4
4'42
°29'
41*4
5'42
*04*
42° 1
6'42
°09'
" ' 41
*10*
41°2
4'""
40*4
5*41
°00'
4P44
742
°00'
4104
2'41
°23'
41*5
7'41
°50'
" 4P
05'
42*0
2*i:>
42*0
2'41
*31'
'':s';':i:
:':42°
22/
42°0
3'" 4
2*25
*- '
41*3
0'"
41°0
8*42
°25V
41*1
9'42
° 18'
w" 4
1*43
' "
Mii42
°15'
4ltf2
0'42
° 17'
41flO
*:::
4i°2
5'
41°2
2'42
°00'
24-H
our
rain
fall
tota
l (f
rom
7:0
0 a.
m.,
July
17,
199
6,
to 7
:00
a.m
., Ju
ly 1
8, 1
996)
L
ongi
tude
(i
nche
s)
89*2
0*88
°07'
-
ggo2
i'88
*08*
88*5
0*87
*48*
****»
87°5
5'88
° 17'
88° 1
7'87
°54'
87°4
6'"8
7*53
*89
°05'
88°4
7'88
°46'
89*3
1*88
°25'
88°1
7'87
°57*
88° 1
0'87
°55'
88°2
7'7"
88*3
8*88
°06'
" 87°
53'
88°0
3'"
89°0
6'::""
87°
58'
ffl'K
'K-.W
.VS)
1 Q
Jtm
.Q »
/
88°3
6'"
88°4
5'88
*14*
87D4
0*87
°44/
oo 2u
89°1
7'
3.40
8.10
16,9
12.
682.
733.
03B.
812.
29 .19
1.61
2.36 .7
32.
834.
218.
093.
151.
973.
113.
057.
821.
604.
45 1.89
5.00
2.95 .6
61.
461.
4210
.00
2.35
2.25
2.20
4.04
3.34
3.14
3.45
Rec
urre
nce
inte
rval
fr
eque
ncy1
(y
ears
)
>1
00 -- - ., <2 -- ~>1
00 >2 -- "-- - ,- - .. >1
0 <2:
- -- -- <2 -- .. -- ,. -
Tabl
e 1.
R
ainf
all d
ata
for
a 24
-hou
r per
iod
at s
elec
ted
rain
gag
es in
nor
ther
n Ill
inoi
s, J
uly
17-1
8,19
96 C
ontin
ued
Floodsof
July
18- P CO § 5' 0 jj n 3 5' o 55'
Map
re
fer
en
ce
num
ber
(see
fig
. 1
and
pl.1
)
R37
R38
R39
R40
R41
R42
R43
R44
R45
R46
R47
R48
R49
R50
I R
51R
52::
R53
R54
R55
R56
R57
R58
R59
R60
R61 R62
R63
R64
R65
R66
R67
R68
1 R
69R
70>
R71
" R
72R
73R
74
Stat
ion
num
ber
1165
2611
6616
1166
6111
6725
1167
5311
6819
1168
9711
6910
1173
5411
7376
1174
5711
7916
1183
2411
8353
1187
5611
9021
1190
2911
9030
1192
21G
lG
2G
3G
4G
6G
7G
8G
9G
10G
ilG
12G
13G
14G
15G
16G
17G
18G
19G
20
Stat
ion
nam
e
Otta
wa
4 So
uthw
est :
:!Pa
rk F
ores
tPa
w P
aw 1
Eas
t "s"
:* '*.
_Pe
oton
ePe
ruPi
per
City
Polo
5 N
orth
wes
tPo
ntia
cR
oche
lle
*::::s
m
Roc
kfor
d A
irpo
rtR
omeo
ville
*»
*«*>
Shir
land
Stre
amw
ood
""""'
Stre
ator
3 S
outh
east
Utic
a St
arve
d R
ock
Dam
Wat
seka
2 N
orth
wes
tW
auke
gan
-^
»^«
*W
auke
gan
Num
ber
2W
heat
on 3
Sou
thea
st
Coo
k C
ount
y R
ain
Gag
e N
etw
ork
Site
1C
ook
Cou
nty
Rai
n G
age
Net
wor
k Si
te 2
Coo
k C
ount
y R
ain
Gag
e N
etw
ork
Site
3C
ook
Cou
nty
Rai
n G
age
Net
wor
k Si
te 4
Coo
k C
ount
y R
ain
Gag
e N
etw
ork
Site
5C
ook
Cou
nty
Rai
n G
age
Net
wor
k Si
te 6
Coo
k C
ount
y R
ain
Gag
e N
etw
ork
Site
7C
ook
Cou
nty
Rai
n pa
ge N
etw
ork
Site
8C
ook
Cou
nty
Rai
n G
age
Net
wor
k Si
te 9
Coo
k C
ount
y R
ain
Gag
e N
etw
ork
Site
10
Coo
k C
ount
y R
ain
Gag
e N
etw
ork
Site
1 1
Coo
k C
ount
y R
ain
Gag
e N
etw
ork
Site
12
Coo
k C
ount
y R
ain
Gag
e N
etw
ork
Site
13
Coo
k C
ount
y R
ain
Gag
e Net
wor
k Si
te'1
4C
ook
Cou
nty
Rai
n G
age
Net
wor
k Si
te 1
5C
ook
Cou
nty
Rai
n G
age
Net
wor
k Si
te 1
6C
ook
Cou
nty
Rai
n G
age
Net
wor
k Si
te 1
7C
ook
Cou
nty
Rain
Gag
e N
etw
ork
Site
18
Coo
k C
ount
y Ra
in G
age
Net
wor
k Si
te 1
9
Dat
a-
colle
ctio
n ag
ency
La
titud
e ~
" "1"
""N
WS"
NW
S"
NW
SN
WS
mm
m *
^y
g'
: ""'N
WS
'
:"E"::::
:'::: SB--
~jq
Wg
:..
mm
m* -
"' j^g
..1|r
.:,,,,,.,, _
___,,,,,,, .j^^g
NW
S'"
.NW
S
N
WS
I::*
::::;:
;:*
::»:::
« J^yj,
NW
S .., :,
~
'N
WS
NW
S"
*'"
""
"""NW
S'"N
WS
NW
SIS
WS
^
isws
ISW
Sisw
sisw
s",,_
, ...
'*is
ws
ISW
S^aasa
m «
mm
mm
m-m
Jg^yg
ISW
SZZ
T"" T
!ri i
sws
ISW
Sm
'
-'
":'"is
wsis
ws
mm
^m
mm
m
'&
£JJ
^«
5
isw
s,,«,,:»
^m
^xm
.. i.
|§^g
ISW
S , "'
',,, 'IS
WS
BWis
ws
4P20
'41
°30'
4P42
'41
°20'
41°2
0'40
°42'
42°0
2'40
°53'
41°5
4'42
° 12'
41*3
6'""""
""""""""
""' 42
628'
42°0
1'41
°06'
41° 1
9'40
°47'
""'""""
"" '-
42°2
1'42
°22'
mm
- 4
i°49
/42
°06'
39"
"" 42
°06'
29"
4200
1'2i
"42
°01'
37*
41°5
6'16
"4]
e>56'
33ff
4165
0'42
"'
WSV
W"
4l°5
Q'4
2"!:4
1°45
'29'
'41
°45'
32"
"7
4P
45'3
'r4r
45'2
7"' r
w' 4
i°40
'47'
'4i
039'
46"
:i 41°
40'3
2"4l
°46'
36"
:":':^: 4
ie40'2
ri!
41°3
5'09
"
24-H
our
rain
fall
tota
l (f
rom
7:0
0 a.
m.,
July
17,
199
6,
to 7
:00
a.m
., Ju
ly 1
8, 1
996)
L
ongi
tude
(i
nche
s)
88°5
5'87
°41'
88°5
8'87
°48'
89°0
8'88
°ir
m*3r
88°3
8'89
°04/
89°0
6'
SS
^S'
89°1
3'88
° 10'
88°4
9'SS
^SP'
87°4
6','8
7°53'
:«*
87°4
9'88
°04'
87°5
2/06
"87
°45'
06"
87°5
2/39
"87
°45'
20W
87°4
5'39
/>87
°38'
42/'
87°5
2'53
"87
?I45'
28;*
87d3
8/27
"87
°52'
20"
8704
6/06
"87
°38'
29"
87°3
2'38
"87
ti57'
55/'
87°5
2'13
"87
°45'
00W
87°3
9'07
"87
°32/
22//
87°5
2'35
//
3.50
6.55
4.84
4.27
2,95 .6
3.4
51.
205.
113.
874.
614.
752.
51 .91
3.10
1.04
2.40
2.35
9.24
2.51
2,47
2.39
2.47
2.36
2.24
"4.
193,
97 *
3.95
6.57
"6.
184,
873.
75 '
10.9
07.
61"" 6
,34,
"
5.47
4.57
5.60
Rec
urre
nce
inte
rval
fr
eque
ncy1
(y
ears
)>2
"
... - -- ._ >2 >2 - ^ - ._ -- -- .. -- - -- .. -- - -- --1 -- - -- - --
Tab
le 1
. Ra
infa
ll da
ta fo
r a 2
4-ho
ur p
erio
d at
sel
ecte
d ra
in g
ages
in n
orth
ern
Illin
ois,
July
17-
18
c 3 3 D> 5
Map
re
fer
en
cenu
mbe
r(s
ee fi
g. 1
and
pl.1
)
R75 R76
1 R
77R
78R
79R
80!
R81
R82
R83
R84
R85
R86
R87
R88 R89
R90
R91
R92
R93
R94
R95
R96
(not
sho
wn)
I R
97R
98I
R99
RIO
O:R
10
1
R10
2IR
103
R10
4R
105
R10
6R
107
R10
8R
109
R11
0R
ill
Stat
ion
num
ber
G2L
:
G22
G23
G24
G25
N/A
N/A
N/A
N/A
N/A
4087
4126
4145
5208
7585
600
4154
5708
8150
600
4211
1308
8042
200
4212
1508
7573
400
4214
2808
8012
900
4215
3308
8084
600
4221
0008
8062
800
4221
1808
8014
700
4223
1508
8091
800
4224
5908
7520
700
4235
2608
7551
800
0552
7800
0552
7940
0552
8000
0552
8030
0552
8500
0553
3400
0553
4500
0553
5070
0554
0060
0554
0195
0554
8105
0554
8280
0554
9850
N/A
N/A
Stat
ion
nam
e
Coo
k C
ount
y R
ain
Gag
e N
etw
ork
Site
20
Coo
k C
ount
y R
ain
Gag
e N
etw
ork
Site
21
Cook
Cou
nty
Rain
Gag
e Net
wor
k Si
te 2
2 "'""
""" ^
;'*C
ook
Cou
nty
Rai
n G
age
Net
wor
k Si
te 2
3Co
ok C
ount
y Ra
in G
age
Net
wor
k Si
te 2
4D
e K
alb
Free
port
tT
"^'
""""
""*"
Mid
way
Chi
cago
Stel
le
^ "' '"
""""" '
"' ***
"* SW
M!"
St. C
harle
s '
Sout
hwes
t For
k of
Sou
th B
ranc
h Ra
vine
10 a
t Hig
hlan
d Pa
rk,ll
l. "
C
lare
ndon
Hill
s C
emet
ery
at D
arie
n, 1
11.D
u Pa
ge C
ount
y A
irpor
t nea
r St.
Cha
rles,
111.
Lake
Zur
ich
Was
tew
ater
Tre
atm
ent F
acili
ty a
t Lak
e Zu
rich,
111.
Ver
non
Hill
s R
ain
Gag
e at
Pra
irie
Vie
w, 1
11.D
iam
ond
Lake
Was
tew
ater
Tre
atm
ent F
acili
ty a
t Dia
mon
d La
ke, 1
11.W
auco
nda
Was
tew
ater
Tre
atm
ent F
acili
ty a
t Wau
cond
a, II
I.R
ound
Lak
e R
ain
Gag
e at
Rou
nd L
ake,
111.
Gra
y sla
ke W
aste
wat
er T
reat
men
t Fac
ility
at G
rays
lake
, 111.
Fox
Lake
Rai
n G
age
at F
ox L
ake,
111.
Wau
kega
n A
irpor
t at W
auke
gan,
III
*
Ken
osha
Airp
ort a
t Ken
osha
, Wis
.
Des
Pla
ines
Riv
er a
t Rus
sell,
111,
Tem
pel F
arm
s D
itch
near
Old
Mill
Cre
ek, 1
11.D
es P
lain
es R
iver
nea
r Gur
nee,
111,
» ««
-»
**ts
ttam
mxl
K
Bul
l Cre
ek n
ear L
iber
tyvi
lle, 1
11.Bu
ffalo
Cre
ek n
ear W
heel
ing,
01
m"
j. <
.,~
Saw
mill
Cre
ek n
ear
Lem
ont,
111.
Nor
th B
ranc
h Ch
icag
o Ri
ver a
t Bee
rfiel
d, 11
1.Sk
okie
Riv
er n
ear H
ighl
and
Park
, 111
.K
ress
Cre
ek a
t 'Wes
t Chi
cago
, 111
, ""
' Z
. ~
St. J
osep
h C
reek
at S
tate
Hig
hway
34
at L
isle
, 111.
""'"
""'*"
""" """
"" """
Nip
pers
ink
Cree
k ab
ove
Won
der L
alce,
111.
~^*»
»**«
»**-
« *
*
-.-.
,,.
...::.
.,«
iS^S
S'J'J
!1;!!!
! tti
fi'M
'ti-X
ttMM
''-''^
Nip
pers
ink
Cre
ek n
ear
Sprin
g G
rove
, 111.
Flin
t Cre
ek n
ear F
ox R
iver
Gro
ve, I
II.
?wA
ddis
on N
orth
Was
tew
ater
Tre
atm
ent F
acili
tySc
haum
burg
Pub
lic W
orks
; ""
" '
_^ ^
mm "
"mm
", 199
6 C
ontin
ued
Dat
a-co
llect
ion
agen
cy
ISW
SIS
WS
s,«,
jg^r
g
ISW
SIS
WS
ISW
S""
' IS
WS'
ISW
SIS
WS
^IS
WS
*""
111 " "
USGS
*"""
'!! :
Wi
USG
SU
SGS
USG
SU
SGS
USG
SU
SGS
:smi'f
USG
SU
SGS
USG
SU
SGS
USG
S
USG
SU
SGS
i; U
SGS
USG
SU
SGS
"~"
USG
SU
SGS
USG
S""
"USG
S
USG
S"'
U
SGS
""""""
"USGS
,,.:.. U
SGS
"""M
ISC
""'"jM
isc;,;b
;;;'
Latit
ude
41°3
5'15
"41
035'
11"
41?3
5'09
"41
°31'
05"
41°3
ri4"
4105
0'40
"42
°16'
47"
41°4
7'12
":
40°5
7A02
V41
°54'
14>/
" 420
ir40
"41
°45'
52"
41°5
4'5
r42
°H'1
3"42
°12>
15"
4201
4'28
"''"'
42°1
5'33
"42
°21/
00"
42°2
1'18
"42
°23'
15"
4282
4'59
"
42°3
5'26
"
42°2
9'22
"42
°26'
39//
42°2
0/39
"42
°18'
22"
42°0
9'05
"41
°42'
28"
42W
10"
42°0
9'34
"41
°51'
23"
41S4
8'06
"42
°23'
07"
42°2
6/37
" "
42&1
2/40
"41
°56'
50"
42W
52"
Lon
gitu
de
87°4
4'52
"87
°38'
60"
87°3
2/14
"87
°44'
00"
87°3
4/25
'/88
°51'
10"
MP
WW
87°4
5'06
"88
°09'
26"
88°2
1'39
"87
°48/
01"
87°5
8'56
"88
°15'
06"
88°0
4'22
"87
°57i'
34"
88°0
1'29
"88
°08/
46"
oo
L/
O ^
oQ
Q ®
f\ 1
' * A *
7"
DO
V
J. "
/88
°09'
18"
88°5
2'07
"
87°5
5'18
"
87°5
5/32
"87
°59'
30"
87°5
6'18
"87
°58'
07"
870
57/2
5"87
°57'
45"
B7*4
9'07"
87°4
7'52
"88
0l2'
15'i'
88°0
4'08
"88
*22'
09'f
8801
4'51
"88
°10'
23"
' 87
°59'
13"
zwyw
24-H
our
rain
fall
tota
l (f
rom
7:0
0 a.
m.,
July
17,
199
6,
Rec
urre
nce
to 7
:00
a.m
., in
terv
alJu
ly 1
8, 1
996)
fr
eque
ncy1
(inc
hes)
(y
ears
)
6.34
5.45
4.80
6.13
5.96
7.47
2.12
7.89
1.22
6.59
2.46
6.63
5.28
2.04
2.10
1.88
2.06 1.72
1.82
1.99
2.72
1.28
2.88
2.91 1.75
1.50
2.86
--
10.7
02.
392.
169.
116.
992.
482.
13 1.98
4.15
2.73
g Ta
ble
1.
Rai
nfal
l dat
a fo
r a
24-h
our
perio
d at
sel
ecte
d ra
in g
ages
in n
orth
ern
Illin
ois,
Jul
y 17
-18,
1996
Con
tinue
d
Floods
of
July
1 <2°
ro
p to * 5' o i (D
Map
re
fer
en
ce
num
ber
(see
fig.
1
and
pl.1
)
R11
2 R
113
R11
4 R
115
R11
6 R
117
Stat
ion
num
ber
N/A
N
/A
N/A
N
/A
N/A
N
/A
Stat
ion
nam
e
Bar
tlett
Was
tew
ater
Tre
atm
ent F
acili
ty
Nap
ervi
lle N
orth
wes
t Was
lew
ater
Pum
p St
atio
n N
aper
ville
Sou
thw
est W
aste
wat
er P
ump
Stat
ion
Wes
t Bra
nch
Du
Page
Riv
er a
t Nap
ervi
lle, I
II
East
Bra
nch
Du
Page
Riv
er a
t Lis
le, 1
11.
Mar
ley
Cre
ek n
ear N
ew L
enox
, III
Dat
a-
colle
ctio
n ag
ency
MIS
Cim
may
mm
m
',m
Xjf
fQ/"
* ::S
3:""'
MISC
"I
DN
RO
WR
IDN
RO
WR
_
;«
.ID
NR
OW
R
Lat
itude
41°5
8'01
" 41
°47'
00"
41°4
2'00
" 4P
66'5
5"
41°4
7'09
" 41
*3 1
'55*
",
Lon
gitu
de88
°09'
57"
88°1
0'22
" 88
°09'
53"
88°1
0'32
/' 88
°04/
46"
87°5
6<15
"
24-H
our
rain
fall
tota
l (f
rom
7:0
0 a.
m.,
July
17,
199
6,
to 7
:00
a.m
., Ju
ly 1
8, 1
996)
(i
nche
s)
3.67
8.
61
10.0
2 2.
24
7.65
3.
95
Rec
urre
nce
inte
rval
fr
eque
ncy1
(y
ears
)
-
'Fre
quen
cy e
stim
ate
from
Huf
f and
Ang
el,
1989
.
f 1 o r o
12 11 10
UJ 5 7
z 5
6
2 4 2
-
1 -
Saw
mill
Cre
ek
near
Lem
ont, Illin
ois
(05
53
34
00
, m
ap r
efe
rence
num
ber
R1
02
)
---
Du
Pa
ge
County
Airp
ort
ne
ar
St. C
ha
rle
s,
Illin
ois
(4
15457088150600,
map r
efe
ren
ce
nu
mb
er
R8
7)
2400
0400
0800
1200
1600
1720
00
2400
04
00
0800
1200
16
00
2000
24
00
18
JU
LY
1996
Fig
ure
3.
Cum
ulat
ive
rain
fall
amou
nts
from
mid
nigh
t Jul
y 17
, 19
96,
at s
elec
ted
U.S
. G
eolo
gica
l S
urve
y ra
in g
ages
in
the
nort
hern
Illi
nois
flo
od
area
.
89°
00'
88°
00'
42°
30'
41°
30'
Bas
e fro
m U
.S.
Geo
logi
cal S
urve
y1:
100,
000
and
1:2,
000,
000
Dig
ital
Dat
aA
lber
s E
qual
-Are
a C
onic
pro
ject
ion
Sta
ndar
d pa
ralle
ls 3
3° a
nd 4
5°,
cent
ral
mer
idia
n -8
9°
\Are
a o
f E
nlar
gem
ent
EX
PL
AN
AT
ION
UR
BA
N A
RE
A
D35
G
AG
ING
ST
AT
ION
AN
D M
AP
RE
FE
RE
NC
E N
UM
BE
R
1530
MIL
ES
1530
KIL
OM
ET
ER
S
(0
0) CO
TJ
O
_O CO 'o c O C 0) .c o D)
C 'c? cp JO
CO 1 D)
_g
o 0) I O)
il
IS
Sum
mar
y 13
Tabl
e 2.
P
eak-
flow
dat
a at
sel
ecte
d U
.S.
Geo
logi
cal S
urve
y st
ream
flow
-gag
ing
stat
ions
in t
he n
orth
ern
Illin
ois
flood
are
a[m
i2, s
quar
e m
iles;
ft,
feet
; ft3
/s, c
ubic
fee
t per
sec
ond;
Q, d
isch
arge
; >,
gre
ater
than
; <, l
ess
than
; G.H
., ga
ge h
eigh
t; --
, not
ava
ilabl
e]
0) i Q> 2
Map
re
fer
en
ce
num
ber
(see
fig
. 4
and
pi. 1
)
r DI D
2
D3
D4
D5
D6
f D
7D
8
D9
D10
Dll
D12
.! D
13D
14
D15
D16
I D
17D
18D
19D
20D
21D
22
D23
D24
I D
25
Max
imum
for
Jul
y 19
96 fl
ood
Prev
ious
max
imum
flo
od
Stat
ion
num
ber
0543
9000
0543
9500
0544
0000
0552
7800
0552
7950
0552
8000
0552
8030
0552
8230
0552
8500
0552
9000
0552
9500
0553
0000
0553
0990
0553
1044
0553
1300
0553
1410
0553
1500
0553
2000
0553
2300
0553
2500
0553
3000
0553
3400
0553
4500
0553
5000
0553
5070
Stat
ion
nam
e
Sout
h B
ranc
h K
ishw
auke
e R
iver
***
"'at
De
Kal
b, II
I,So
uth
Bra
nch
Kis
hwau
kee
Riv
erne
ar F
aird
ale,
111.
Kis
hwau
kee
Riv
er n
ear
Perr
yvill
e II
I __
Des
Pla
ines
Riv
er a
t Rus
sell,
111.
Mill
Cre
ek a
t Old
Mill
Cre
ek, I
II. _
Des
Pla
ines
Riv
er n
ear G
urne
e, 1
11.B
ull C
reek
nea
r Lib
erty
ville
, 111.
^f
BIn
dian
Cre
ek a
t Pra
irie
Vie
w, 1
11.
Buf
falo
Cre
ek n
ear W
heel
ing;
111.
Des
Pla
ines
Riv
er n
ear
Des
Pla
ines
, 111.
Me
Don
ald
Cre
ek n
ear
"^
imm
Mou
nt P
rosp
ect,
111.
Wel
ler
Cre
ek a
t Des
Pla
ines
, 111.
Salt
Cre
ek a
t Rol
ling
Mea
dow
s, H
I.Sa
lt C
reek
nea
r Elk
Gro
veV
illag
e, 11
1.Sa
lt C
reek
at E
lmhu
rst,
111. ^
Salt
Cre
ek a
t 22n
d St
reet
at
Oak
Bro
ok, 1
11.Sa
lt C
reek
at W
este
rn S
prin
gs, 1
11, m
mA
ddis
on C
reek
at B
ellw
ood,
111.
Salt
Cre
ek a
t Bro
okfie
ld, I
II
Des
Pla
ines
Riv
er a
t Riv
ersi
de, 1
11.Fl
ag C
reek
nea
r Will
ow S
prin
gs, 1
11,Sa
wm
ill C
reek
nea
r Lem
ont,
111.
Nor
th B
ranc
h C
hica
go R
iver
at
mm
Dee
rfie
ld, I
II,
If
Skok
ie R
iver
at L
ake
Fore
st, 1
11.
Skok
ie R
iver
nea
r Hig
hlan
d '""
""1M
Bi
Dra
inag
e ar
ea
(mi2
)
*.
,,:,
,:77 J
1,09
9
"
123
...............
61"""
""" 2
32 6,30
36.0
:,:,
,:,
J <
J g
360
8888
8888
! *7 (J
O
13.2
30.5
51.9
':":":::':";i
':w91
.210
3
115 17
.914
663
0"
:;r
j<5.
5
13.0
JMRS
rjg
j
"13"
"- "2
1:1 ""
Peri
od
of
reco
rd
1979
-cur
rent
1939
-cur
rent
1939
-cur
rent
1961
-cur
rent
:198
9-cu
rren
t19
45-c
urre
nt19
89-c
urre
nt19
89-c
urre
nt
1952
-cur
rent
1940
-cur
rent
1952
-cur
rent
1950
-cur
rent
1973
-cur
rent
1992
-cur
rent
::: 19
89-c
urre
nt19
94-c
urre
nt
1945
-cur
rent
1951
-cur
rent
1989
-cur
rent
1943
-cur
rent
' 195
1-cu
rren
t19
85-c
urre
nt
1952
^-cu
rrent
1951
-cur
rent
1967
-cur
rent
Type
of
re
cord
::::::;:::
; Q Q Q
"
Q """
Q """"
'*Q Q Q Q Q Q Q Q G.H. Q G
.H.
Q
V QG
.H.
,^Q
_Q
Q
":j:j«
Q W
-" wW
MttJ
ffly11
' #M
«W
Dat
e
07/0
2/83
03/1
9/79
02/2
0/94
" 02
/21/
94
" 03
/21/
79
03/0
6/76
09/2
7/86
06/3
0/93
09/2
7/86
06/3
0/93
02/1
9/94
02/2
0/94
07/2
2/82
10/0
1/86
08/1
4/87
06/1
0/67
08/1
4/87
06/2
4/94
08/2
1/90
,v06
/02/
95
08/1
7/87
""*
08/1
4/87
05/1
0/90
08/1
5/87
09/1
4/61
:::
05/0
9/90
06/0
7/93
08/1
4/87
'
09/2
6/86
07/2
2/82
'"08/
14/8
7 """"
'Gag
e he
ight
(ft
)
"15.
80'
10.4
5
10.3
120
.71
9 69
10.7
510
.75
12.0
611
.95
4:75
5.94
5.72
7.94
10.8
8
8.08
15.0
9 *
14.0
314
.04
13.3
754
.11
;;;:
;:;;
f03
4
> "<
::s::! 12
.84
10.1
99.
90 !:1
3 71
!I!S!E:
15*.4
615
.60
8.27
'
8.35
;:r 9.
09 ::B
s*
Dis
ch
arge
(f
t3/s
)
3,50
0
8,79
0\1
7»10
0"~
2,1
20 "*
1,94
01,
600
1,09
03,
530
105
500
815
887
4900 80
6
" 1,
590
1,65
0
1,53
0
""3,
540
1,12
0,,,, :<:::!
9,77
0
* 2,
680
1,73
056
5
*" 49
228
8M
895
Dat
e
07/1
8/96
07/1
8/96
07/1
8/96
"07
/18
/96
-07
/19/
96
07/1
8/96
07/1
9/96
07/1
8/96
07
/18/
96
07/1
7/96
07/1
8/96
07/1
8/96
07/1
7/96
07/1
8/96
07/1
8/96
' 07
/18/
9607
/18/
96
07/1
8/96
07/1
7/96
07/1
8/96
07/1
8/96
07/1
8/96
07/1
8/96
07/1
8/96
07/1
8/96
07/1
8/96
Gag
e he
ight
(ft
)
12.9
7
13.3
7
23.5
4
5.19
11.9
44.
93 1.39
3.75
4.09 1.95
'3.51
4.41
5.42
12.3
8
10.9
153
.47
8.03
6.52
8.13
6.33
10.3
717
.54
7,52
3.41
7,27
Dis
ch
arge
(f
t3/s
)
2,28
0
25,4
00
24,2
00 272
1,02
055
8 13.8
139
160
857 91
.6
188
360
934
" 1,
600
400
3,69
02,
300
3,07
0
159
103
365
Rec
ur
renc
e in
terv
al
(yea
rs)
>12
5
>11
00
>]5
0
<!2
>25
<*2
<22
<22
2<2
'<2
2<2
2<2 <2 3--
2>2
^-- 1? 2<2
2>25
2>10
0
2<2
2<2
2<2
Park
, 111.
£
Tabl
e 2.
P
eak-
flow
dat
a at
sel
ecte
d U
.S.
Geo
logi
cal S
urve
y st
ream
flow
-gag
ing
stat
ions
in th
e no
rther
n Ill
inoi
s flo
od a
rea C
ontin
ued
Floods
of
July 1 10 p _L jo "_, 5'
z 0 3. JD 3 5' o_
55'
Map
re
fer
en
ce
num
ber
(see
fig
. 4
and
pi. 1
)
D26
D27
D28
D29
D30
D31
D32
D33
D34
D35
D36
; D
37
D38
I D
39D
40
D41
D
42
D43
D44
D45
D46
Max
imum
for
Jul
y 19
96 f
lood
Prev
ious
max
imum
flo
od
Stat
ion
num
ber
0553
5500
0553
6000
0553
6105
0553
6215
0553
6235
0553
6255
0553
6265
0553
6275
0553
6290
0553
6340
0553
6500
0553
6995
0553
7500
0553
9000
0553
9900
0554
0060
05
5400
91
0554
0095
0554
0130
0554
0160
0554
0195
Stat
ion
nam
e
Wes
t For
k of
the
Nor
th B
ranc
hC
hica
go R
iver
at N
orth
broo
k, 1
11.
Nor
th B
ranc
h C
hica
go R
iver
at
"""N
iles,
111
.N
orth
Bra
nch
Chi
cago
Riv
er a
tA
lban
y A
venu
e at
Chi
cago
, 111
.Th
orn
Cree
k at
Gle
nwoo
d, II
I ^.
Dee
r C
reek
nea
r C
hica
goH
eigh
ts, 1
11.
But
terf
ield
Cre
ek a
t Flo
ssm
oor,
111,
Lan
sing
Ditc
h ne
ar L
ansi
ng, 1
11.
Tho
rn C
reek
at T
horn
ton,
HI.
" "
*"
Litt
le C
alum
et R
iver
at S
outh
Hol
land
, 111
.
Mid
loth
ian
Cre
ek a
t Oak
For
est,
III *
"
Tin
ley
Cre
ek n
ear
Palo
s Pa
rk, 1
11."
Chi
cago
San
itary
and
Shi
p C
anal
at"
1'R
omeo
ville
, 111
,
Lon
g R
un n
ear L
emon
t, 11
1.H
icko
ry C
reek
at J
olie
ti 01
. ~
"°""
Wes
t Bra
nch
Du
Page
Riv
er n
ealr
Wes
t Chi
cago
, 111
.
Kre
ss C
reek
at W
est C
hica
go*
Ill>
f
Spri
ng B
rook
at F
ores
t Pr
eser
vene
ar W
arre
nvill
e, 1
11.
Wes
t Bra
nch
Du
Page
Riv
er
*ne
ar W
arre
nvill
e, 1
11.
mW
est B
ranc
h D
u Pa
ge R
iver
"""
near
Nap
ervi
lle, 1
11.
East
Bran
ch D
u Pa
ge R
iver
, '*"
near
Dow
ners
Gro
ve, 1
11,
..Jj
li:
St. J
osep
h C
reek
at R
oute
34
at'"*
'
Dra
inag
e ar
ea
(mi2
)
11.5
urn
JOG
113 24.7
23.1
-
.23.
58.
84
amx'
.W.:
1 f\
A
208 12
.6
11.2
20.9
<~
JQ
7
»
28.5 6^83
» -
90,4
123 26
.6
'M<
T1.1
""""*
Peri
od
of
reco
rd
1952
-cur
rent
1950
-cur
rent
1989
-cur
rent
1949
-cur
rent
1948
-cur
rent
1948
-cur
rent
1948
-cur
rent
1948
-cur
rent
1947
-cur
rent
1950
-cur
rent
1951
-cur
rent
1984
-cur
rent
1951
-cur
rent
1944
-cur
rent
1961
-cur
rent
1985
-cur
rent
19
91-c
urre
nt
1968
-cur
rent
1988
-cur
rent
m!98
9-cu
rren
t
lx"l9
88--
curr
ent
Type
of
re
cord
Q,,. Q
,,,.,.,
Q
"" Q Q Q r\
m
m
Q Q Q Q, ^
Q Q ,,,
Q Qm
m
Mfit&
X'
Q "
"
! :
Q Q Q '"
"""
Dat
e
08/1
4/87
08/1
4/87
05/1
0/90
08/1
7/68
11/2
8/90
07/1
3/57
05/2
2/82
10/1
1/54
05/1
0/48
K 06/
1 4/
8107
/13/
5711
/28/
90
07/1
4/57
07/1
3/57
04/2
2/73
10/1
0/54
11/2
8/90
03/1
8/91
11/2
0/91
10/1
0/54
06/1
3/81
12/0
3/82
"
08/1
4/87
!!P8
/14/
87
'06/
24/9
4
08/1
5/87
02/1
9/94
05/2
5/91
05/1
0/90
' 05/
09/9
0^
Gag
e he
ight
(ft
)
10.1
0
"""" 1
1.35
""
6.34
11:26
"11:7
911
.75
11.9
710
.18
9.24
17.0
616
.00
20.5
0
20.1
19.
007.
6710
.30
»» 26.2
7
9.91
14,9
010
.44
10.6
37,
37
11.2
4
"5,8
5°"
9.92
':
9.58
15,5
5
' 11
.30
Dis
ch
arge
(ft
3/s)
1,19
0
" 2,
590
1,89
0
2,60
070
9
1,38
02,
160
461
3,63
04,
700
709
4,44
0 62
71,
930
19,2
79 '
""''
3,95
25,
083
3,16
017
,300 984
i!S!
605
"573
29
7
3,05
0 '
* *;'""
;":!S-
-
3,42
088
1 "
... 93
g m
Dat
e
07/1
8/96
07/1
9/96
07/1
8/96
07/1
8/96
07/1
8/96
07/1
8/96
07/1
8/96
07/1
8/96
07/1
9/96
07/1
8/96
07/1
8/96
«,,
07/1
7/96
07/1
8/96
07/1
8/96
07/1
8/96
07/1
8/96
07
/18/
96
< - 0
7/18
/96
07/1
8/96
"" 0
7/18
/96
" 0
7/18
/96
Gag
e he
ight
(f
t) 5.00
6.44
4.87
11.4
1
12.5
99.
52
16.2
4
20.0
1
6.15
10.2
525
.31
11.1
010
.00
8.75
9,24
12
.60
6.41
14.3
1
16.1
3
12.8
9"
Dis
ch
arge
(f
t3/s
)
313
766
900
2,70
082
4
2,22
020
8
4,47
0
3,87
0
473
2,01
019
,948
5,31
08,
710
583
1,98
0 39
3
3,47
0
6,62
0
936
1,28
0
Rec
ur
renc
e in
terv
al
(yea
rs)
2<2
2<2
4--
2>25
: 2>
5
2>25
2>2
2>25
2>5
2i>10
2>50
1>10
02>
252>
2
2^10
0
2>10
0
2>10
0
(^ 2>5
2>10
0L
isle
, 111
.
Tabl
e 2.
P
eak-
flow
dat
a at
sel
ecte
d U
.S.
Geo
logi
cal S
urve
y st
ream
flow
-gag
ing
stat
ions
in th
e no
rther
n Ill
inoi
s flo
od a
rea
Con
tinue
d
Map
re
fer
en
cenu
mbe
r(s
eefig
. 4
Stat
ion
and
pi. 1
) nu
mbe
r St
atio
n na
me
| D
47
0554
0250
Ea
st B
ranc
h D
u Pa
ge R
iver
at
"i
Bol
ingb
rook
, 111
.D
48
0554
0275
Sp
ring
Bro
ok a
t 87t
h St
reet
near
Nap
ervi
lle, 1
11.D
49
0554
0500
D
u Pa
ge R
iver
at S
hore
woo
d, H
I ...
*5D
50
0554
3500
Ill
inoi
s R
iver
at M
arse
illes
, 111.
D51
05
5470
00
Cha
nnel
Lak
e ne
ar A
ntio
ch, I
II : f
D52
05
5475
00
Fox
Lake
nea
r Lak
e V
illa,
111.
D53
05
5477
55
Squa
w C
reek
at R
ound
Lak
e, 11
1.D
54
0554
8000
N
ippe
rsin
k La
ke a
t Fox
Lak
e, 11
1. "
: D
55
0554
8105
N
ippe
rsin
k C
reek
abo
ve W
onde
r ::::s:
:"La
ke, 1
11,
D56
05
548
1 10
Nip
pers
ink
Cre
ek b
elow
Won
der
Lake
, 111.
D57
05
5482
80
Nip
pers
ink
Cre
ek n
ear S
prin
g "i!
"^^^^
^G
rove
, 111.
D58
05
5485
00
Fox
Riv
er a
t Joh
nsbu
rg, 1
11.D
59
0554
9500
Fo
x R
iver
nea
r McH
enry
, 111
,'!:*
D60
05
5498
50
Flin
t Cre
ek n
ear F
ox R
iver
Gro
ve, 1
11.D
61
0555
0000
Fo
x R
iver
at A
lgon
quin
, IE,
'"""""
" »'"
D62
05
5505
00
Popl
ar C
reek
at E
lgin
, 111
. *"
D63
05
5510
00
Fox
Riv
er a
t Sou
th E
lgin
, Hi »
D64
05
55 1 2
00
Pers
on C
reek
nea
r St.
Cha
rles,
111.
"""' """
'
D65
05
5517
00
Bla
ckbe
rry
Cre
ek n
ear
s IM
f53
Yor
kvill
e, 1
11.
01
D66
05
5525
06
Fox
Riv
er a
t Day
ton,
111.
Max
imum
for
Jul
y 19
96 fl
ood
Prev
ious
max
imum
flo
odD
rain
age
area
(mi2
).,.7
5J,,
9.90
:«:;
32
4
' 8,2
59
... .."
17.2
84.5
973
MSI
*;; 1
Q'J
1,20
51,
250 37
'1,4
03 35.2
1,55
6 51.7
«.,,
70 2
"2,6
42 "
""
Perio
dof
reco
rd
1988
-cur
rent
1987
-cur
rent
1940
-cur
rent
1919
-cur
rent
1939
-cur
rent
1939
-cur
rent
1989
-cur
rent
;19
39-c
urre
nt19
94-c
urre
nt
1994
-cur
rent
1966
-cur
rent
1939
-cur
rent
"""
1941
-cur
rent
1989
-cur
rent
1915
-cur
rent
1951
-cur
rent
1989
-cur
rent
'
1960
-cur
rent
1960
-cur
rent
1914
-cur
rent
Type of
reco
rd
, Q
,,
Q Q Q"
G.H
.G
.tt.
Q 1
1'"G
.H.
::::*:
Q
' W
Q QG
.H.
G;H. Q Q
>
.«S
Q»
»
'""Q Q Q
mm
Q
Gag
ehe
ight
Dat
e
05/1
0/90
05/0
9/90
10/1
1/54
"12
/04/
8204
/06/
6004
/06/
60
07/1
8/93
04/0
5/60
06/1
1/67
"
06/1
1/67
09/2
6/86
04/0
6/60
04/0
5/60
""*
02/2
0/94
"
"047
0 1/1
6 *"
**04
/06/
60, 0
4/02
/79
04/2
2/73
08/0
5/89
07/1
8/93
0272
0/71
""
02/0
8/65
; 07/
03/g
3 ......
.....
' 01/
25/6
0 ""
10/1
1/54
(ft)
22,6
7
^.6
8
11.0
616
.78
8.29
8.18
'
6.42
8.12
13.9
5
8.76
14.2
6
7.55
6.36
5.32
":: 4.
50 '""
.» 5.45
5.79
1K:14.
45 ::!
7.64
9.66
9.91
"36.
4724
.63
Dis
ch
arge
(ft3
/s)
1,99
0
694
12,0
0094
,100 ?-
! '"
'""
312 ~ -,', -
2,91
0 "
.v
s...;.
..!...
^,...
...
^^
: . . ::
: : .
552 ^8
6,61
018
96 "
"
641
6,99
01,
970
250
.,,,
,. 2
>Q
6Q
~
*'"'" 47
,100
Dat
e
07/1
8/96
07/1
8/96
07/1
8/96
07/1
9/96
07/1
8/96
07/1
9/96
-07
/20/
9607
/18/
9607
/19/
9607
/18/
96
"
07/1
8/96
07/1
8/96
-07
/19/
9607
/197
9607
/19/
9607
/18/
96
07/2
0/96
07/1
8/96
07/2
0/96
07/1
8/96
' 07
/18/
96
07/1
9/96
Gag
ehe
ight
(ft)
23.7
5
10.7
7
14.0
314
.53
4.72
4.67
::;:;:::
;:; ^^
4.69
-6.1 3.32
5,66
4.70
4.64
2.98
2.15
2.29
13.1
57.
79
13,1
6
24:4
7
Dis
char
ge(f
t3/s
)
3,98
0
1,75
0
17,3
0079
,300 39
.6
205
163
304 72
.5
1,76
0
140
2,13
01,
990
5,51
0
55,4
00
Rec
ur
renc
ein
terv
al(y
ears
)
2>10
0
2>25
2>10
02>
25 3--
2<2
3 4- 4..
2<2
3 3~
2<2
2<2
2<2
4 '>10
1>10
0
2>ioo
'Fre
quen
cy e
stab
lishe
d ba
sed
on w
eigh
ted
estim
ate
of fl
ood-
freq
uenc
y st
atis
tics
(Cur
tis,
1987
, p. 4
).fr
eque
ncy
esta
blis
hed
base
d on
sta
tion
data
onl
y on
flo
od-f
requ
ency
sta
tistic
s.
W i tu
Gag
e-he
ight
gag
e on
ly.
Insu
ffic
ient
leng
th o
f re
cord
to c
ondu
ct f
requ
ency
ana
lysi
s (H
ydro
logy
Sub
com
mitt
ee o
f Int
erag
ency
Adv
isor
y C
omm
ittee
on
Wat
er D
ata,
198
2).
5Reg
ulat
ed f
low
.
Tabl
e 3.
H
igh
wat
er m
arks
from
Illi
nois
Dep
artm
ent o
f Nat
ural
Res
ourc
es c
rest
-sta
ge g
ages
in th
e no
rther
n Ill
inoi
s flo
od a
rea
[--,
not a
vaila
ble;
>, g
reat
er th
an]
1 1 Flood
s of
Jul
y 1 IO o _L (O
(O
O
) 5* 0 3. (D -t 5*
o 55'
Stre
am
Aux
Sab
le
Aux
Sab
le
Fidd
ymen
t
Fidd
ymen
t
Fidd
ymen
t
Fidd
ymen
t
Flag
g
Flag
g
Flag
g
Flag
g
Flag
g
Flag
g
Ford
Hei
ghts
Ford
Hei
ghts
Ford
Hei
ghts
Ham
mel
Cre
ek
Ham
mel
Cre
ek
Ham
mel
Cre
ek
Ham
mel
Cre
ek
Loc
atio
n
Site
num
ber
17- U
pstr
eam
sid
e of
Del
bos
Roa
d br
idge
just
ups
trea
m f
rom
Illi
nois
and
Mic
higa
n C
anal
Site
num
ber
1 8- U
pstr
eam
sid
e of
Chi
cago
, Roc
k Is
land
, and
Pac
ific
Rai
lroa
d br
idge
Site
num
ber
1- U
pstr
eam
sid
e fa
ce o
f Ham
ilton
left
ban
k at
inte
rsec
tion
of M
orga
n-to
p bo
lt in
sec
ond
rail
post
Site
num
ber
2- M
ark
on w
arni
ng s
ign
at O
akst
reet
bri
dge
0.9
feet
abo
ve g
roun
d
Site
num
ber
3- Y
ello
w n
ail o
n po
wer
ligh
t pol
e at
left
ups
trea
m c
orne
r at
Mac
Gre
gor
Roa
d
Site
num
ber 4
- U
pstr
eam
sid
e fa
ce o
f Fer
rel R
oad
righ
t ban
k at
inte
rsec
tion
of M
cKen
zie
Ave
nue
fenc
e co
rner
po
st 0
.6 f
eet u
p fr
om g
roun
d
Site
num
ber
1- W
est e
nd o
f 48t
h St
reet
on
Tol
lway
Fro
ntag
e R
oad
Site
num
ber
2-N
orth
east
cor
ner o
f Bir
ch S
tree
t and
Lio
ns T
owns
hip
just
dow
nstr
eam
fro
m 5
5th
Stre
et
Site
num
ber 3
- Top
of s
torm
sew
er a
long
eas
t sid
e of
1-2
94 e
nd o
f Keo
kuk
Rea
djus
t dow
nstr
eam
from
Pla
infi
eld
Roa
d
Site
num
ber 4
- M
anho
le c
over
ups
trea
m f
rom
tollw
ay b
ridg
e on
Coc
hise
Dri
ve in
Ind
ian
Hea
d Pa
rk
Site
num
ber
5- D
owns
trea
m c
oncr
ete
para
pet o
n W
olf R
oad
imm
edia
tely
dow
nstr
eam
1-2
94 to
llway
Site
num
ber
6- C
oncr
ete
para
pet d
owns
trea
m s
ide
of 9
1st S
tree
t bri
dge
Site
num
ber
1- R
ed n
ail i
n se
cond
pow
er p
ole
sout
h fr
om n
orth
end
of K
enne
dy L
ane
Site
num
ber
2- R
ed n
ail i
n fir
st p
ower
pol
e no
rth
of D
iplo
mat
nor
th o
f Ken
nedy
Lan
e
Site
num
ber
3- R
ed n
ail i
n po
wer
pol
e at
Con
gres
s an
d K
enne
dy L
ane
Site
num
ber
3- O
n 6-
inch
dia
met
er a
sh tr
ee d
irec
tly s
outh
of S
hore
woo
d Se
wag
e T
reat
men
t Pla
nt
Site
num
ber 4
- O
n th
e le
ft u
pstr
eam
win
gwal
l of b
ox c
ulve
rt u
nder
Bro
oksh
ore
Dri
ve R
oad
Site
num
ber
5- O
n m
ulti-
trun
k W
illow
tree
at t
he r
ear
of M
rs. S
chm
arz'
pro
pert
y
Site
num
ber
7- O
n th
e le
ft u
pstr
eam
win
gwal
l of p
ipe
culv
ert j
ust b
elow
the
sout
h re
tent
ion
pond
on
box
culv
ert
Ele
vatio
n of
hig
h w
ater
mar
k (f
eet a
bove
sea
leve
l)
507.
38
519.
22
600.
79
624.
78
640.
92
653.
76
636.
75
634.
31
633.
43
632.
17
631.
44
682.
00
632.
56
632.
08
633.
46
586.
4
591.
2
592.
6
603.
1un
der
Rav
en R
oad
Ham
mel
Cre
ekSi
te n
umbe
r 8-
On
the
left
upst
ream
win
gwal
l of
pip
e cu
lver
t jus
t bel
ow th
e so
uth
rete
ntio
n po
nd60
5.3
Tabl
e 3.
H
igh
wat
er m
arks
from
Illi
nois
Dep
artm
ent
of N
atur
al R
esou
rces
cre
st-s
tage
gag
es in
the
north
ern
Illin
ois
flood
are
a C
ontin
ued
Summary
Stre
am
Ham
mel
Cre
ek
Ham
mel
Cre
ek
Hic
kory
Cre
ek
Hic
kory
Cre
ek
Hic
kory
Cre
ek
Hic
kory
Cre
ek
Just
ice
Just
ice
Just
ice
Just
ice
Kyt
e R
iver
Kyt
e R
iver
Kyt
e R
iver
Kyt
e R
iver
Kyt
e R
iver
Kyt
e R
iver
Kyt
e R
iver
Kyt
e R
iver
Kyt
e R
iver
Kyt
e R
iver
Loc
atio
n
Site
num
ber
9- O
n th
e ri
ght d
owns
trea
m w
ingw
all
of b
ox c
ulve
rt a
djac
ent t
o U
.S. R
oute
52
at th
e so
uthw
est
corn
er o
f Sh
orew
ood
Site
num
ber
12-
On
the
left
dow
nstr
eam
win
gwal
l of p
ipe
culv
ert u
nder
Gre
enfi
eld
Roa
d
Site
num
ber 4
- Ju
st u
pstr
eam
from
the
conf
luen
ce o
f Hic
kory
and
Spr
ing
Cre
eks 20
fee
t bel
ow th
e w
all o
n th
e le
ft b
ank
Site
num
ber
6- S
idew
alk/
entr
y at
sou
thea
st c
orne
r of
Jac
kson
and
Gar
nsey
Site
num
ber
7- H
ende
rson
nor
th o
f Jac
kson
- ho
use
num
ber 4
11 w
ith c
hain
link
fenc
e on
the
wes
t si
de o
f H
ende
rson
, 1
foot
abo
ve g
roun
d
Site
num
ber
8- D
rape
r/W
alnu
t an
d E
J&E
RR
- 2
inch
es a
bove
bot
tom
of h
ighe
st "
min
i-ar
ch"
open
ing
in p
arap
et
wal
l on
Dra
per A
venu
e br
idge
Site
num
ber
1- R
ed n
ail o
n po
wer
ligh
t pol
e no
rthw
est c
orne
r of 7
3rd
Plac
e an
d 86
th A
venu
e
Site
num
ber
2- 1
.4 f
eet b
elow
the
fire
hydr
ant t
op a
t hou
se n
umbe
r 744
1 C
ork
Ave
nue
driv
eway
Site
num
ber
3- M
ark
belo
w r
ight
dow
nstr
eam
win
gwal
l of R
oute
171
cul
vert
Site
num
ber
4- O
val p
ipe
unde
r Illi
nois
and
Mic
higa
n R
ailr
oad
for 4
1st
Stre
et b
ridg
e
Site
num
ber
1- A
t the
sou
ther
n en
d of
Roc
helle
Sew
age
Dis
posa
l and
Tre
atm
ent P
lant
on
the
righ
t ban
k at
tach
ed
to th
e ir
on p
ost d
rive
n in
ban
k
Site
num
ber
2- O
n th
e ri
ght u
pstr
eam
win
gwal
l of t
he b
ridg
e at
the
entr
ance
to th
e se
wag
e-di
spos
al p
lant
Site
num
ber
3- A
t the
left
upst
ream
cor
ner o
f Lak
evie
w D
rive
bri
dge
atta
ched
to th
e ir
on p
ost
driv
en in
the
bank
Site
num
ber 4
- O
n th
e le
ft up
stre
am w
ingw
all o
f Rou
te 5
1 br
idge
on
the
sout
h si
de o
f Roc
helle
Site
num
ber
5- O
n th
e ri
ght u
pstr
eam
pie
r fro
m M
ain
Stre
et b
ridg
e
Site
num
ber
6- O
n a
post
at t
he ri
ght u
pstr
eam
cor
ner o
f Sec
ond
Stre
et b
ridg
e
Site
num
ber
7- A
t the
Fir
st A
venu
e br
idge
; up
stre
am g
age
on th
e ri
ght w
ingw
all
Site
num
ber
8- A
t the
Bur
lingt
on a
nd N
orth
ern
Rai
lroa
d br
idge
up
stre
am g
age
on th
e ri
ght p
ier
Site
num
ber
9- A
t the
Nor
thw
este
rn R
ailr
oad
brid
ge o
n th
e ri
ght d
owns
trea
m h
eadw
all
Site
num
ber
10- A
t the
Ave
nue
brid
ge o
n a
pipe
dri
ven
in th
e ri
ght u
pstr
eam
ban
k
Elev
atio
n of
hig
h w
ater
mar
k (f
eet a
bove
sea
leve
l)
614.
2
607.
3
539.
01
548.
88
549.
77
566.
52
597.
70
597.
69
579.
03
587.
51
771.
42
773.
36
775.
23
776.
07
779.
07
779.
9
780.
05
781.
89
782.
33
783.
49
Tabl
e 3.
H
igh
wat
er m
arks
from
Illi
nois
Dep
artm
ent o
f N
atur
al R
esou
rces
cre
st-s
tage
gag
es in
the
nor
ther
n Ill
inoi
s flo
od a
rea
Co
ntin
ue
d
1 1
Floods
of
Jul « ro
p <o
<o O> 5* Northern
II o to"
Stre
am
Kyt
e R
iver
Kyt
e R
iver
Kyt
e R
iver
Kyt
e R
iver
Lan
sing
Ditc
h
Lan
sing
Ditc
h
Lan
sing
Ditc
h
Lan
sing
Ditc
h
Lan
sing
Ditc
h
Lan
sing
Ditc
h
Lan
sing
Ditc
h
Lan
sing
Ditc
h
Lan
sing
Ditc
h
Lan
sing
Ditc
h
Lon
g R
un
Lon
g R
un
Lon
g R
un
Lon
g R
un
Loc
atio
n
Site
num
ber
1 1- A
t the
Sch
ool A
venu
e br
idge
on
the
left
upst
ream
win
gwal
l
Site
num
ber
12-
On
the
left
ups
trea
m w
ingw
all o
f the
Rou
te 3
8 br
idge
Site
num
ber
13- O
n th
e le
ft up
stre
am w
ingw
all o
f the
Rou
te 5
1 br
idge
on
the
nort
h ed
ge o
f Roc
helle
Site
num
ber
14-
In th
e su
burb
of H
illcr
est j
ust
nort
h of
Roc
helle
on
an a
band
oned
hea
dwal
l at
the
wes
t end
of
Scot
t Str
eet
Site
num
ber
1- O
n N
orth
Cre
ek a
t Tor
renc
e A
venu
e on
the
righ
t dow
nstr
eam
win
gwal
l
Site
num
ber
2- O
n N
orth
Cre
ek a
t Oak
woo
d A
venu
e in
Lan
sing
on
the
left
ups
trea
m w
ingw
all
Site
num
ber
3- B
urnh
am A
venu
e ne
ar 1
89th
Str
eet i
n L
ansi
ng o
n th
e ri
ght u
pstr
eam
hea
dwal
l
Site
num
ber
4- A
t the
cor
ner o
f Gle
nwoo
d-L
ansi
ng R
oad
and
Wen
twor
th A
venu
e at
Lan
sing
Air
port
on
the
stee
l po
st o
n th
e ri
ght b
ank
of th
e m
ain
chan
nel
Site
num
ber
5- A
t 201
st S
tree
t and
Tor
renc
e A
venu
e on
the
left
dow
nstr
eam
win
gwal
l
Site
num
ber
6- L
ynw
ood
site
in th
e N
orth
1/2
Sec
tion
7, T
owns
hip
35 N
orth
Ran
ge 1
5 Ea
st, o
n th
e ri
ght
upst
ream
hea
dwal
l
Site
num
ber
7- I
n th
e tr
aile
r pa
rk ju
st d
owns
trea
m fr
om R
oute
30
at th
e br
idge
cro
ssin
g on
the
left
dow
nstr
eam
he
adw
all
Site
num
ber
8- I
n st
ruct
ure
143,
Dr.
Mar
y W
oodl
and
Res
ervo
ir o
n th
e le
ft u
pstr
eam
fac
e of
the
cont
rol s
truc
ture
Site
num
ber
9- A
t Sau
k T
rail
Roa
d on
the
left
ups
trea
m w
ingw
all
Site
num
ber
10- L
ansi
ng D
itch
cros
sing
at 2
23rd
Str
eet i
n Sa
uk V
illag
e on
the
stee
l pos
t on
the
righ
t dow
nstr
eam
si
de o
f the
cul
vert
pip
e
Site
num
ber
1- U
pstr
eam
face
of
1760
0 W
est r
ight
ban
k at
gro
und
leve
l at t
he f
irst p
ost o
n th
e st
eel
guar
drai
l 2.
1 fe
et d
own
from
the
top
of th
e po
st
Site
num
ber
2- U
pstr
eam
face
of
1760
0 W
est (
1st s
tree
t ups
trea
m fr
om th
e oi
l tan
ks)
righ
t ban
k ye
llow
nai
l in
the
seco
nd w
ood
guar
drai
l pos
t fro
m th
e dr
ivew
ay o
n th
e st
eel g
uard
rail
1.6
feet
dow
n fr
om th
e to
p of
the
post
Site
num
ber
3- U
pstr
eam
face
of S
mith
Roa
d -y
ello
w n
ail i
n th
e 47
-inc
h tw
in tr
unk
cotto
nwoo
d tr
ee r
ight
up
stre
am s
ide
of th
e ba
nk.
Site
num
ber 4
- D
owns
trea
m f
ace
of A
rche
r Ave
nue
1 .4
feet
dow
n fr
om th
e to
p of
the
tent
h gu
ardr
ail p
ost (
wes
t)
Ele
vatio
n of
hig
h w
ater
mar
k (f
eet a
bove
sea
lev
el)
-
785.
99
-
793.
94
609.
35
609.
81
610.
42
613.
85
613.
27
616.
58
622.
53
623.
95
632.
63
645.
10
596.
35
595.
82
630.
19
645.
67so
uth
of 1
35th
Str
eet
Tabl
e 3.
H
igh
wat
er m
arks
from
Illi
nois
Dep
artm
ent o
f N
atur
al R
esou
rces
cre
st-s
tage
gag
es in
the
north
ern
Illin
ois
flood
are
a C
on
tinu
ed
Str
eam
Loca
tion
Ele
vatio
n of
hig
hw
ater
mar
k (f
eet
abov
e se
a le
vel)
Nat
alie
-Mid
loth
ian
Cre
eks
Nat
alie
-Mid
loth
ian
Cre
eks
Nat
alie
-Mid
loth
ian
Cre
eks
Nat
alie
-Mid
loth
ian
Cre
eks
Nat
alie
-Mid
loth
ian
Cre
eks
Nat
alie
-Mid
loth
ian
Cre
eks
Nat
alie
-Mid
loth
ian
Cre
eks
Nav
ajo
Cre
ek
Nav
ajo
Cre
ek
Nav
ajo
Cre
ek
Nav
ajo
Cre
ek
Nav
ajo
Cre
ek
Saw
mill
Saw
mill
Saw
mill
Saw
mill
Saw
mill
Saw
mill
Saw
mill
Site
num
ber
1- U
nion
Ditc
h W
alk
brid
ge to
the
stru
ctur
e 6
feet
from
the
top
of "
Stea
dfas
t Bri
dges
" on
the
east
si
de o
f the
bri
dge
Site
num
ber
2- T
op ri
ght u
pstr
eam
cor
e ap
ron
at 1
67th
Stre
et a
nd th
e cu
lver
t at s
truc
ture
num
ber
32
Site
num
ber
3- S
truc
ture
32
inle
t to
Am
il G
ate
chis
eled
mar
k on
the
left
eas
t win
gwal
l fac
e 4.
4 fe
et d
own
from
th
e to
p ha
ndra
il at
the
four
th p
ost f
rom
the
quon
set h
ut
Site
num
ber
4- U
pstr
eam
sid
e fa
ce o
f Gay
nell
right
ban
k w
ingw
all t
op o
f the
fou
rth
6x8 ti
mbe
r do
wn
Site
num
ber
5- U
pstr
eam
sid
e fa
ce o
f Gen
try
left
ban
k- c
hise
led
yello
w n
ail i
n th
e le
ft up
stre
am w
ingw
all
2.1
feet
dow
n fr
om th
e to
p
Site
num
ber
6- U
pstr
eam
face
of
155t
h br
idge
nea
r Kilp
atri
ck 0
.2 f
oot d
own
from
Low
Cho
rd
Site
num
ber
7- U
pstr
eam
sid
e fa
ce o
f Ken
ton
culv
ert
1.6
feet
dow
n fr
om th
e to
p of
the
head
wal
l
Site
num
ber
1- O
n th
e ri
ght u
pstr
eam
hea
dwal
l of R
oute
83
culv
ert
Site
num
ber
2- O
ld U
.S. G
eolo
gica
l Su
rvey
gag
e on
the
righ
t dow
nstr
eam
hea
dwal
l of
127t
h St
reet
cul
vert
Site
num
ber
3- O
n th
e le
ft d
owns
trea
m h
eadw
all o
f Har
lem
Ave
nue
culv
ert
Site
num
ber
4- A
t the
inte
rsec
tion
of S
enec
a R
oad
and
Kio
wa
Lan
e on
the
stre
et s
ign
Site
num
ber
5- O
n th
e le
ft up
stre
am h
eadw
all o
f 76t
h A
venu
e cu
lver
t
Site
num
ber
2- N
orth
east
cor
ner
of th
e cu
lver
t on
the
trib
utar
y at
Cas
s St
reet
(B
aile
y R
oad)
just
nor
th o
f 91
st S
tree
t -2
inch
es a
bove
the
botto
m g
uard
rail
Site
num
ber
3- L
ow s
pot i
n W
hite
Dee
r D
rive
nor
th o
f tw
in c
ulve
rts
Site
num
ber 4
- Car
riag
e G
reen
s C
ount
ry C
lub
dam
just
ups
trea
m fr
om 1
-55
-ove
rtop
ped
the
low
er p
ortio
ns o
f the
cr
est o
f the
dam
in s
ever
al lo
catio
ns in
add
ition
to fl
ow th
roug
h th
e em
erge
ncy
spill
way
("V
" at
the
east
end
of
the
dam
) at
the
left
abu
tmen
t
Site
num
ber
5- T
op o
f Car
riag
e G
reen
s C
ount
ry C
lub
dam
wes
t of t
he s
pillw
ay
Site
num
ber
6- T
op o
f Car
riag
e G
reen
s C
ount
ry C
lub
dam
a fe
w f
eet t
o th
e w
est o
f site
num
ber
5
Site
num
ber
7-To
p of
Car
riag
e G
reen
s C
ount
ry C
lub
dam
a fe
w f
eet t
o th
e w
est o
f site
num
ber
6
Site
num
ber
8-To
p of
Car
riag
e G
reen
s C
ount
ry C
lub
dam
a fe
w f
eet t
o th
e w
est o
f site
num
ber 7
698.
19
692.
91
692.
19
690.
58
682.
56
633.
80
630.
75
593.
06
620.
4
622.
14
621.
4
634.
4
668.
99
682.
99
700.
50
704.
50
705.
0
705.
4
705.
8
Tabl
e 3.
H
igh
wat
er m
arks
fro
m I
llino
is D
epar
tmen
t of
Nat
ural
Res
ourc
es c
rest
-sta
ge g
ages
in th
e no
rther
n Ill
inoi
s flo
od a
rea C
ontin
ued
Floods c_ £ 10 p i at 5' o a. <D -t O 35'
Str
eam
Saw
mill
Shor
ewoo
d
Shor
ewoo
d
Shor
ewoo
d
Silv
er C
reek
Silv
er C
reek
Silv
er C
reek
Silv
er C
reek
Silv
er C
reek
Silv
er C
reek
Silv
er C
reek
Silv
er C
reek
Silv
er C
reek
Silv
er C
reek
Silv
er C
reek
Silv
er C
reek
Silv
er C
reek
Ston
y C
reek
Ston
y C
reek
Ston
y C
reek
Ston
y C
reek
Loc
atio
n
Site
num
ber
9-T
op o
f Car
riag
e G
reen
s C
ount
ry C
lub
dam
a fe
w f
eet t
o th
e w
est o
f site
num
ber
8
Site
num
ber
1- B
otto
m o
f the
gas
met
er a
t num
ber 3
01 R
oute
59
Site
num
ber
2- R
ed n
ail i
n th
e ba
se o
f a
17-f
eet e
lm a
t the
dow
nstr
eam
sid
e. N
orth
wes
t cor
ner
of n
orth
par
king
lot o
f the
Gra
ce B
aptis
t Chu
rch
Site
num
ber
3- C
oncr
ete
base
of t
he y
ield
str
eet s
ign
at P
icni
c an
d W
est S
hore
Site
num
ber
1- 5
th A
venu
e on
the
left
ups
trea
m w
ingw
all
Site
num
ber
2- 9
th A
venu
e on
the
left
ups
trea
m w
ingw
all
Site
num
ber
3- 1
5th
Ave
nue
on th
e le
ft u
pstr
eam
win
gwal
l
Site
num
ber 4
- 17
th A
venu
e on
the
left
ups
trea
m w
ingw
all
Site
num
ber
5- 1
9th
Ave
nue
on th
e le
ft u
pstr
eam
win
gwal
l
Site
num
ber
6- B
ehin
d A
lber
to C
ulve
r Fa
ctor
y on
the
railr
oad
brid
ge le
ft u
pstr
eam
hea
dwal
l
Site
num
ber
7- A
rmita
ge A
venu
e on
the
left
ups
trea
m w
ingw
all
Site
num
ber
8- F
ulle
rton
Ave
nue
on th
e le
ft u
pstr
eam
win
gwal
l
Site
num
ber 9
- N
orth
east
cor
ner o
f K-M
art p
arki
ng lo
t on
the
righ
t ups
trea
m w
ingw
all
Site
num
ber
10- M
annh
eim
Roa
d on
the
righ
t ups
trea
m h
eadw
all
Site
num
ber
11-
Gra
nd A
venu
e on
the
left
ups
trea
m w
ingw
all
Site
num
ber
12- B
elm
ont A
venu
e on
the
left
ups
trea
m w
ingw
all
Tri
-Sta
te T
ollw
ay o
n th
e le
ft u
pstr
eam
hea
dwal
l
Site
num
ber
1- 8
0th
Ave
nue
(Rob
erts
Roa
d) o
n th
e le
ft d
owns
trea
m w
ingw
all
Site
num
ber
2- H
arle
m A
venu
e (R
oute
43)
on
the
left
dow
nstr
eam
pie
r
Site
num
ber
3- V
irgin
ia A
venu
e (1
03rd
Roa
d) o
n th
e le
ft d
owns
trea
m w
ingw
all
Site
num
ber
4- D
owns
trea
m f
rom
Rid
gela
nd A
venu
e an
d 12
0 fe
et d
owns
trea
m f
rom
a r
ailr
oad
brid
ge o
n a
Ele
vatio
n of
hig
h w
ater
mar
k (f
eet a
bove
sea
lev
el)
706.
5
575.
00
576.
36
573.
60
619.
20
- ~
625.
44
629.
0
630.
81
632.
45
637.
00
639.
23
640.
41
642.
81
643.
80
588.
4
590.
3
590.
9
590.
824
-inc
h di
amet
er s
ycam
ore
tree
on
the
left
ban
k
Ston
y C
reek
Site
num
ber
5- U
pstr
eam
of R
idge
land
Ave
nue
and
80 fe
et d
owns
trea
m f
rom
a r
ailr
oad
on th
e ri
ght b
ank
592.
2
Tabl
e 3.
H
igh
wat
er m
arks
from
Illi
nois
Dep
artm
ent
of N
atur
al R
esou
rces
cre
st-s
tage
gag
es in
the
north
ern
Illin
ois
flood
are
a C
ontin
ued
Ele
vatio
n of
hig
hw
ater
mar
k S
trea
m
Loca
tion
(fee
t ab
ove
sea
leve
l)
Ston
y C
reek
Ston
y C
reek
Ston
y C
reek
Ston
y C
reek
Ston
y C
reek
Site
num
ber
6- C
entr
al A
venu
e on
the
righ
t dow
nstr
eam
hea
dwal
l
Site
num
ber
7- I
n th
e W
olfe
Sta
te W
ildlif
e R
efug
e an
d so
uth
of th
e in
ters
ectio
n of
Lav
ergn
e A
venu
e an
d 10
9th
Stre
et o
n th
e le
ft do
wns
trea
m w
ingw
all
Site
num
ber
8- 1
15th
Str
eet o
n th
e le
ft d
owns
trea
m w
ingw
all
Site
num
ber
9- K
ostn
er A
venu
e on
the
left
dow
nstr
eam
win
gwal
l
Site
num
ber
10-
On
the
righ
t ups
trea
m h
ead
wal
l at i
nter
sect
ion
of E
diso
n A
venu
e an
d E
ast S
hore
Dri
ve
>592
.4
589.
33
588.
1
599.
52
oU111 (/}cc 111Q.I-UJ 111 U_
Um3 u
m o cc< I u
30,000
25,000
20,000
15,000
10,000
5,000
South Branch Kishwaukee River at De Kalb, Illinois South Branch Kishwaukee River near Fairdale, Illinois
2400 1200 2400 1200 2400 1200 2400 1200
17 18 19 20July 1996
2400 1200
21
2400
90,000
80,000
70,000
60,000
50,000
40,000
30,000
20,000
10,000
0
...__. Du Page River at Shorewood, Illinois
Fox River at Dayton, Illinois
Illinois River at Marseilles, Illinois
17 18 19 20July 1996
21 22 23
Figure 5. Flood discharge hydrographs for selected U.S. Geological Survey streamflow-gaging stations in the northern Illinois flood area.
24 Floods of July 1 8-20, 1996, in Northern Illinois
of the estimated 100-year flood frequency were esti mated at 11 continuous streamflow-gaging stations.
REFERENCES
Chagnon S.A., ed, 1997, The record rainstorm onJuly 17-18, 1996 in northern Illinois: Illinois StateWater Survey, Miscellaneous Publication, MCCResearch Report 97-02, 160 p.
Chicago Tribune, 1996, After the deluge, work and worries,July 21, Chicago Tribune, 150th year, no. 203,section 1, p. 1.
1996, Federal disaster aid to help flood victims in11 counties, July 26, Chicago Tribune, 150th year,no. 208, section 2, p. 1.
Curtis, G.W., 1987, Technique for estimating flood-peak discharges and frequencies on rural streams in Illinois: U.S. Geological Survey Water-Resources Investigations Report 87^4207, 79 p.
Huff, F.A., and Angel, J.R., 1989, Frequency distributions and hydroclimatic characteristics of heavy rainstorms in Illinois: Illinois State Water Survey Bulletin 70, 177 p.
Hydrology Subcommittee of Interagency Advisory Committee on Water Data, 1982, Bulletin 17B, Guidelines for determining flood flow frequency: U.S. Geological Survey, Office of Water Data Coordination, Reston, Virginia, 183 p.
References 25
APPENDIX
Appendix 1.
This appendix consists of the time series discharge, stage, and rainfall digital data for the July 1996 flood in northern Illinois. The data were contained on a 3.5 in. floppy disk. An index to the data is listed in the file SUMM.TXT. All the data were compressed and will need to be decompressed before the files can be read.
Appendix 1. 29
