L DA1 A4 NATONA PROGRAM' OR INSPECTONOF NON- FDERAL DAMS /INYTO N ON AD DAM A.U CONPS 0 NO ENG N RSWALTHAM MONEW ENCLAND DIV JUN 80UNCLASSIF OED F/G 13/13 NL

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NYSTROM POND DAMCT 00457

NAUGATUCK RIVER BASINLITCHFIELD, CONNECTICUT

G G27 1984

L-l= [DISTRIBUTION STATEMENT i DAppToved for public releasel

Distribution Unlimited

PHASE I INSPECTION REPORTNATIONAL DAM INSPECTION PROGRAM

49-024 6 4 08 07 /80

"I"

IINrl ssmrnESECURITY CLASSIFICATION OF THIS PAGE (When Li.. Enteoed)

REPORT DOCUMENTATION PAGE READ INSTRUCTIONSREPOREPORCUMUNTERION PG E NEFORE COMPLETING FOM1. REPORT 004NUMBER 2 - .OVYACCESSIONk 3 RES ENT'S CATALOG NUMBER

CT 047 A >2__________

4 TITLE (and Subtle) I TYPE OF REPORT & PERIOD COVERED

Nystrom Pond Dam INSPECTION REPORT

NATIONAL PROGRAM FOR INSPECTION OF NON-FEDERAL 6 PERFORMING ORG. REPORT NUMBERDAMS

7. AUTHOR(O) 8 CONTRACT OR GRANT NUMBER(e)

U.S. ARMY CORPS OF ENGINEERSNEW ENGLAND DIVISION

S. PERFORMING ORGANIZATION NAME AND ADDRESS 10. PROGRAM ELEMENT. PROJECT. TASKAREA & WORK UNIT NUMBERS

II. CONTROLLING OFFICE NAME AND ADDRESS 12. REPORT DATE

DEPT. OF THE ARMY, CORPS OF ENGINEERS June 1980

NEW ENGLAND DIVISION, NEDED ,7. NUMBERO, PAGES424 TRAPELO ROAD, WALTHAM, MA. 02254 45

14. MONITORING AGENCY NAME 6 ADDRESS(I1 dlitterg 1~. Controlling Office) IS. SECURITY CLASS. (of thle epOt)

UNCLASSIFIEDIta. DECLASIFICATION/DOWNGRAOING:

SCHEDULE

16. DISTRIBUTION STATEMENT (ol thls Repor)

APPROVAL FOR PUBLIC RELEASE: DISTRIBUTION UNLIMITED

17. DISTRIBUTION STATEMENT (01 i1 *&street onoemtd in BJ*Ck 30. iI diffeoiwl tram Report)

I. SUPPLEMENTARY NOTES

Cover program reads: Phase I Inspection Report, National Dam Inspection Program;however, the official title of the program is: National Program for Inspection ofNon-Federal Dams; use cover date for date of report.

19. KEY WORDS (Contue o en fee lide if neceeeivY sod IdeNeiliy by block Rmnbe')

DAMS, INSPECTION, DAM SAFETY,

Naugatuck River Basin

Litchfield, Connecticut

S0. A MSTMACT (Com.niu* on reveree side ## neoeeIos y and IdentIY by block namber)

The Nystrom Pond Dam consist6 of a concrete, stone masonry and earth structure

with a total length of 104 feet and a maximum height of 15 feet. The main dam

appears to be in fair condition and requires some work. The dike is in poor con-

dition with very little freeboard or top width is in some areas.In accordance

with the Corps of Engineers' Recommended Guidelines for Safety Inspection of Dams

the Nystrom Pond Dam is classified as "Small" in size based on storage capacity.

Therefore, the dam is classified as "Low" potential hazard.

DD , ,:N 147- LOI7IO1 OF I-AV 6S IS OSOLEE

___ _-___,__--____ __. .........__ ___ ___ ___ __

ROALD HAESTAL INC.CONSULTING ENGINEERS

37 Brookside Road a Waterbur, Conn. 06708 * Tel. 20 1 75 ;-980

May 30, 1980

The Department of the ArmyNew England DivisionCorps of Engineersr424 Trapelo RoadWaltham, Massachusetts 02154

Attention: E. P. GouldProject Management Division

Re: Nystrom Pond Dam

Litchfield, Connecticut

Gentlemen:

Following field surveys and a dam failure analysis of Nystrom

Pond Dam, we conclude that the dam should be reclassified as hav-

ing a low hazard potential.

HWe are enclosing a brief letter report substantiating our

findings.

. - Very truly yours,

ROALD STAD, C.

By_______________________

RH :cft | NTts CP.;,&,I ,EnN. 5DT9C T

Unannou'ced r_

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TABLE OF CONTENTS

PAGE

DESCRIPTION I

EVALUATION OF HYDRAULIC/HYDROLOGIC FEATURES 2

h OVERVIEW PHOTO 3

LOCATION PLAN 4

APPENDIX A ENGINEERING DATA Al -A3

APPENDIX B PHOTOGRAPHS BI - B2

APPENDIX C HYDRAULIC/HYDROLOGICCOMPUTATIONS CI - C17

APPENDIX D INVENTORY FORMS

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DESCRIPTION

NYSTROM POND DAMCT 00457TOWN OF LITCHFIELD, COUNTY OF LITCHFIELDON TURNER BROOKOWNED AND OPERATED BY THE STATE OF CONNECTICUT,DEPARTMENT OF ENVIRONMENTAL PROTECTION

The Nystrom Pond Dam consists of a concrete, stone masonry

and earth structure with a total length of 104 feet and a maximum

height of 15 feet. The dam was originally constructed as a stone

masonry wall with an upstream earth embankment. The concrete por-

tion of the dam was constructed on and against the downstream face

of the stone masonry wall in 1963. In 1969, the dam was raised

approximately 2 feet and timber flashboards were replaced by a

concrete wier. A downstream earth embankment is present against

the left end of the dam. A 20 foot wide overflow spillway is lo-

cated near the right side of the dam. The outlet works located

at the left end of the spillway consist of a 12-inch cast iron

pipe through the dam controlled by an upstream gate.

A 3 foot high earth and stone masonry dike is located approxi-

mately 500 feet south of the main dam on the west side of the pond.

See location plan, page 4.

The dam is owned and operated by the State of Connecticut,

Department of Environmental Protection. The dam impounds Nystrom

Pond, a portion of Nystrom State Park, and is used for fishing

and swimming.

The main dam appears to be in fair condition and requires

some work. The dike is in poor condition with very little free-

board or top width in some areas. The top of the dike is 2.5 feet

lower than the crest of the dr

IIH Il I I II I I I I II I ,H, M 1

EVALUATION OF HYDRAULIC/HYDROLOGIC FEATURES

The Nystrom Pond Dam has a tributary watershed of 0.19 square

miles, and a water surface area and storage capacity at spillway

level of 17.4 Acres and 130 Acre-Feet respectively. The storage

1capacity with the water level at the crest of the dam would be

193 Acre-Feet.

The spillway has a capacity of 60 cfs before overtopping the

[dike and 390 cfs at the crest of the dam. In accordance with the

Corps of Engineers' Recommended Guidelines for Safety Inspection

rof Dams, the Nystrom Pond Dam is classified as "Small" in sizebased on storage capacity.

Plans for the 1963 reconstruction, As-Built plans for raising

the dam and spillway calculations for a 100-Year Flood are avail-

able. See List of References, Appendix A.

FA dam breach analysis was made using the Corps of Engineers'

"Rule of Thumb" guidance for estimating downstream dam failure

Fhydrographs. Failure was assumed with the water level at the top

L of the dam. This is a conservative assumption as the dike is 2.5

feet lower and would be overtopped, preventing the water level

[from reaching the top of the dam. The peak discharge from the

dam breach was calculated to be 4,100 cfs. The flood waters were

[ routed through the downstream reaches.

The flood waters would overtop Moosehorn Road and Northfield

Road by about 5 feet and Connecticut Route 254 by about 2 feet,

Ebefore being dissipated behind the Northfield Brook Flood ControlDam. The waters would also flood cellars in a few homes. Loss of

I life from a failure of Nystrom Pond is unlikely. Therefore, the

dam is classified as "Low" potential hazard. See Appendix C for

calculations -,-d Figure 3, page C-17 for the Limits of Potential

I Flooding.2

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rILI Appendix A

Engineering Data

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II'1I

ILIST OF REFERENCES

References are located at the Department of Environmental

L Protection, Office of the Superintendent of Dams, State Office

Building, Hartford, Connecticut, 06115.

1) Plan, "Connecticut State Park and Forest Commission,Nystrom Pond, Northfield, Connecticut, Dam Repairs"C. H. Nickerson and Company, Incorporated, March 19,1962.

2) As-Built Drawing ",S.1.te of Connecticut Public WorksDepartment, Raise Height of Dam, Nystrom State Park,Thoutston, Connecticut", Charles P. Hurley, ConsultingEngineer, Winsted, Connecticut, July 1968. (As-Built,January 1, 1970)

3) Flood Flow Computations for 100-Year Storm.

4) Miscellaneous correspondence on dam.

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Appendix B

r Photographs

[Note: For Photo Locations,see Figures 2 and 2-Ain Appendix A

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PHOTO NO.

UPTEMSOE FMI ANOTEEROSON O LET O SPILWA

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IPHOTO NO. 1

UPSERVEAMSP OF MAIFRO DOWSRAM.

F NOTE EROSION ON LEWNTREOF SPEA

USARMENGIEEROVERVIWE WGAN OFSRO DAMD DRMDONTRA

US W ARM ENGINEERSWEGADNSRMPN AWASS ET"R NATIONAL PROGRAM OF TURNER BROOK

WALNAW MASACUSETSINSPECTION r. LITCHFIELD, CONNECTICUT

ROALD HAESTAD, INC. NO-E ASCT 00457CONSULTING E?4OINEER3 5ONAPRIL '80WATERBURY, CONNECTICUT5API 8

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ElPHOTO NO. 3

CREST OF DIKE.

L NOTE TREE, LACK OF WIDTH AND PREEBOARD

~ -

PHOTO NO. 4*

DIKE FROM DOWNSTREAM

[ *12 APRIL '80

US ARMY ENGINEER DIV NEW ENGLAND NY STROM POND DAM[COWS OF ENGINEERS NATIONAL PROGRAM OF TURNER BROOKWALTHAM, MASSACHUSETTS INSPECTION OF LITCHFIELD. CONNECTICUT

ROALD ESTAD, INC. NNFDDASCT 001 _-7CONSULTING ENGINEERSNO-E.DM

WATERBURY, CONNECTICUT 5 APR' 80

82

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Appendix C

Hydraulic/HYJrO1OAiC Cc2~i:~i±t~ r.s

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TRIAL CROSS SECTIONAL ARAA(.PIA 4 L98~ S. F'TL TRIAL STORAGE. IN 5'A(1I-) . 'R- )- 2 AC. Fl

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-SECION /V0 I/ (sEFi 4 .)iS/e"2o'/~rz

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SECTION NUMBER 2A

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2.0 18 26 1. 4 40360 7.19 1853. 0 22 'l .0 O03 60 l . 9'5 3934,0 26 6 5 2" r ,:, 0 0. -

0 ( 30 0 3.00 03 (j 1.1 . ,6 0 ,4 1 113 3.147 . 0 1'"2 1 .') I.-

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- MANNING COE:FFIC]:E:NT=N=,0500

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RIGI T OVR2&'q/V.

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SECTION NUMBAR I 2

7-0 T4L

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3 0 1.3 0 3 3904. 0 .... (!j 65 i :",' 6 'U

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STORAGE AT TIME OF FAIL, JRE=S= 1.93 AC . F:

LENOtHT OF REACH=L1-= 81.0 F-

INF LOW INTO REACI---'Pl.=: 27. C f[II1I'711H lOF:: j'..(3 ]W flj: : '. Fl ,

CROSS SECTIONAL AREI-AAl - 22? 9 SO, f IST(0 P A(G : I N RI,.ACH= VI I - A C : F.

TRI AL, REACH OUTF:'L.,OW-P (TIRI 1 A ) C F,I R' AL ]D . lTI OF: I-:W -H (- 1 1AOF)* . V I

TI? IAI.1 CR '.. SS SECTIONAl.., AREA=:Ar TI'IAI.,)=, 224 SO, FTTRIAl.. STORAGE IN REACH=V(T,..[AL,) = '4,2 AC FT

REACH OIJTFIlOW=QP2= 271.5 CFSI PT H OF F:LOW :H 2= 7. q F'T

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A R S V G

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10 0 62 1.9 19 11. K'i

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INFLOW INTO REAC'H=:(FI I "' C71DEP1H OF* F-LOW-H1=: 6 FT

CR(SS SECTI(ONAI.. AREA--lA - 2. 1. ,. S( FISTORAGE IN REACH-Vt1: 1 .8 AC. FT

T RIAL., RE:ACH OL."F L*IW=' P (TRIAI..,)= 2 '0 j ... C 'TRIAL DEPTH OF: FLOW=H(TRIAL,)= 5.5 F"T

1 R.A L CIOSS SECTIONAL AREA=A(TRIAL)= 2(00'3 SO. FTTRIAL STORAGE IN REACIH-=V(TRIAL)= 13.2 AC, FT.

REACH OLUTFrLOW=QP2 = 5?'5 CFSDEPTH OF FLOW=H2= 5.5 FT.

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CKD BY .~ DATE .YI5......37 Brookside Road - Waterbury, Conn. 06708 JOB ~ N ......

SUBJECT..XSTTM.... p;177 .A4 ....'l1 ..R ah.....................................

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H W A R S V

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STORAGE AT TIME OF FAlIdI'I:->' 193 AC . FI.

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TR IAL CROSS SECTIONAL AREA=A(TRIAL)= 206 SO. FlTRIAl., STORAGE IN REACH=V(TRIAL)= 9,5 AC. FT.

REACH OtIFLOW='IP2= 2"399 CFSDEPTH OIF FLOW=H2= 4,18 FT.

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BY.... .. DATE. - A.. ROALD HAESTAD, INC. SHEET NO .... ... OF..!.CONSULTING ENGINEERS

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