AD-A145 329 NAT ONAL PROGRAM FOR INSPECTION 0F NON-FEDERAL DAMS /

MATTNE RNNUGGET LAKE DA..U) CORPS 0F ENGINEERS WALTHAMMA NEW ENGLAND DIV OCT 78

UNCLASSIFIED F/G 13/13 NL

II, UK-momom

11113.2

1_.25 lI~ 1.

M'CRO0COPY RESO~uTKON TEST CHARTN4' 7NA, B REA a C STANCARZS- 963-

N FRENCH RIVER BASINCHARLTON, MASSACHUSETTS

lITTLE NUGGET LAKE DAM

MA 00103

PHASE I INSPECTION REPORTNATIONAL DAM INSPECTION PROGRAM

>_ DTICELECT; "

DSEP 6 1984

D

CDEPARTMENT OF THE ARMYNEW ENGLAND DIVISION, CORPS OF ENGINEERS

WALTHAM, MASS. 02154DSTRIBUIONSTTD;

Approved to' public r'lw, OCTOBR 1978 Distrlution Unlimit-

OCTOBER 1978 - - ~-- ihhl --

84'09 05 1101

tiNCI ASS1TF[SECURITY CLASSIFICATION OF THIS PAGE (Whe.n Date fknetotd)

READ INSTRUCTIONSREPORT DOCUMENTATION PAGE BEFORE COMPLETING FORM

1. REPORT NUMBER 12. G OVT ACCESSION NO. 3. RECIPIENT'S CATALOG NUMBER

4 TITLE (ad S.bth,5.) S. TYPE OF REPORT I PERIOD COVERED

Little Nugget Lake Dam INSPECTION REPORT

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

DlAMS _______________

7 AUVNORf.) 8. CONTRACT OR GRANT NUMBER(&)

U.S. ARMY CORPS OF ENGINEERSNEW ENGLAND DIVISION

IPERFORMING ORGANIZATION NAME AND ADDRESS WC PROGRAM ELEMENT. PROJECT. TASKARE A I WORK UN IT NUMBERS

ICON TROLLING OFIFICE NAME AND ADDRESS 12. REPORT OATS

DEPT. OF THE ARMY, CORPS OF ENGINEERS October 1978NEW ENGLAND DIVISION, NEDED 13. NUMBER OF PAGES

424 TRAPELO ROAD, WALTHAM, MA. 02254 6014 MONITORING AGENCY NAME I ADDRESSIl dierent #mm Caumlting Office) IS. SECURITY CLASS. (of Ibis. rfpti)

UNCLASSIFIEDIt&. DECLASSIFICATION/'OWNGRAD&NG

SCHE DUL E

1S. DISTRIBUTION STATEMENT (at tsl Reprt)

APPROVAL FOR PUBLIC RELEASE: DISTRIBUTION UNLIMITED

17. DIST RIBUTION STATEMEN T (of the abstract antevof in Block 0, it ifferen trai A4111100)

IS. 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 dlate of report.

IS. KEY WORDS (Continue on roweirse aide if 0...em ,4W a 0"tfp am 61199h lum )

DAMS, INSPECTION, DAM SAFETY,

French River BasinChariton, Massachusetts

20. ABSTRACT (Coninua n reverse oli. Of neceosaev and fimif' Ap block 11111e1")

Little Nugget Lake Dam is a dry-stone masonry and earth dam with a broad crested

weir spillway. The dam has a maximum height of 13 feet and is approximately 170

feet long including spillway length. It has been classified as a "significant"

hazard. The dam is considered to be in poor condition. An outflow test flood of

1,970 cfs ( 2 the PMF) will overtop the west dike by about 2.2 feet and the dam by

1.0 foot and the swale by 2.9 feet.

DD , 'OA l s 147.3 COITION 01 1 OV 65IS8OBSOLETE

DEPARTMENT OF THE ARMYNEW ENGLAND DIVISION, CORPS OF ENGINEERS

424 TRAPELO ROAD

WALTHAM, MASSACHUSETTS 02154

R EPLY TO

ATTENTION OF:

NEDED

JAN 3 0 1979

Honorable Edward J. KingGovernor of the Commonwealth ofMassachusetts

State HouseBoston, Massachusetts 02133

Dear Governor King:

I am forwarding to you a copy of the Little Nugget Lake Dam Phase IInspection Report, which was prepared under the National Program forInspection of Non-Federal Dams. This report is presented for your useand is based upon a visual inspection, a review of the past performanceand a brief hydrological study of the dam. A brief assessment is in-cluded at the beginning of the report. I have approved the report andsupport the findings and recommendations described in Section 7 and askthat you keep me informed of the actions taken to implement them. Thisfollow-up action is a vitally important part of this program.

A copy of this report has been forwarded to the Department of Environ-mental Quality Engineering, the cooperating agency for the Commonwealthof Massachusetts.- In addition, a copy of the report has also been fur-nished the owner, the Town of Charlton, Board of Selectmen, Town Hall,Main Street, Charlton, Massachusetts 01507, ATTN: Mr. Leonard Haebler,Chairman.

Copies of this report will be made available to the public, upon re-quest, by this office under the Freedom of Information Act. In the caseof this report the release date will be thirty days from the date ofthis letter.

I wish to take this opportunity to thank you and the Department ofEnvironmental Quality Engineering for your cooperation in carrying outthis program.

Sincerely yours,

md*/Jc*lI' CHANDLEAs stated ( Colonel, Corps of Engineers

Division Engineer

Accession For

NTIS GRA&l

DTIC TA3 F1Unnno in iced LIJustificntioL

By.Distribution/ LITTLE NUGGET LAKEAvailability Codes

Avai I and/or MA 00103,Dist Special

FRENCH RIVER BASINCHARLTON, MASSACHUSETTS

PHASE I INSPECTION REPORTNATIONAL DAM INSPECTION

PROGRAM

NATIONAL DAM INSPECTION

PROGRAM

PHASE I INSPECTION REPORT

BRIEF ASSESSMENT

Identification No.: MA00103

Name of Dam: Little Nugget Lake

Town: Charlton

County and State: Worcester County, Massachusetts

Stream: Little River - A tributary of French River

Date of Inspection: August 31, 1978

Little Nugget Lake Dam is a dry-stone masonry andearth dam with a broad crested weir spillway. Theexisting dam was constructed prior to 1924 with majorrepairs performed in 1940 and 1967-1968. The dam has amaximum height of 13 feet and is approximately 170 feetlong including spillway length. A 30-foot long swalelocated on the east end of the dam is about 2 feet lowerthan the remainder of the dam. Most of the downstreamslope of the dam is a vertical dry-stone masonry wall.A 3-foot high dike is located several hundred feet westof the dam. The 20.5 foot long spillway is constructedof concrete with 2.5-foot high mortared stone masonrytraining walls.

Little Nugget Lake Dam was neither designed norconstructed according to current approved state-of-the-art procedures. Based upon the visual inspection at thesite, the limited engineering data, and little evi-dence of operational or maintenance procedures, it wasconcluded that there are deficiencies that must becorrected to assure the continued performance of thisdam. Generally, Little Nugget Lake Dam is considered tobe in poor condition. Because of the potential dangerto lives and property downstream Little Nugget Lake Danhas been classified as a "significant" hazard.

LITTLE NUGGET LAKE

The following visible signs of distress indicatea potential hazard at the site: bulging of the stonewall on the downstream face of the dam, slight-to-moderate seepage at the downstream toe of the dam, ac-cumulation of debris in the spillway channel; inoper-able slide gate; spalling concrete on the spillway andmissing concrete on the end of the spillway; lack ofadequate riprap protection on the upstream face of thedam; and thick vegetation growing immediately down-stream of the dam.

Hydraulic analyses indicate that the spillway(without flashboards) and emergency spillway can dis-charge a flow of 300 cubic feet per second (cfs) whenthe water surface is at elevation (El) 771.5, which isthe average elevation of the crest on the dike west ofthe dam. An outflow test flood of 1,970 cfs (one-halfthe probable maximum flood) will overtop the west dikeby about 2.2 feet and the main dam by 1.0 foot and theswale by 2.9 feet. The spillways may be inadequatesince they can discharge only 15 percent of the testflood before the dam is overtopped. In the event ofovertopping, complete failure of the dam and west dikecould occur.

It is recommended that the Owner employ a quali-fied consultant to evaluate the stability of the dam,conduct a more detailed hydrologic and hydraulic in-vestigation, and evaluate the seepage underneath thedam. It is also recommended that the Owner repair theconcrete on the weir; repair the gate operatingmechanism; add riprap to the upstream slope of the damand dike; and remove all trees and brush from theupstream face and downstream of the toe of the dam. TheOwner should also implement a systematic program ofinspection and maintenance.

LITTLE NUGGET LAKE

I

The above recommendations and remedial measuresshould be implemented by the Owner within a period ofone year after receipt of this Phase I InspectionReport. An alternative to these recommendations wouldbe draining the pond and breaching or removing the da

-Edward M. Greco, P.E.Project Manager

Metcalf & Eddy, Inc.

/) Connecticut RegistrationNo. 08365

Approved by:

Stephen L Bisho P.E STEPHEN

Vice President L.Metcalf & Eddy, Inc. oISHOP 0

Massachusetts RegistrationNo. 19703 ONAL

LITTLE NUGGET LAKE

IThis Phase I Inspection Report on Little Nugget Lake Damhas been reviewed by the undersigned Review Board members. In ouropinion, the reported findings, conclusions, and recommendations areconsistent with the Recommended Guidelines for Safety Inspection ofDams, and with good engineering judgment and practice, and is herebysubmitted for approval.

RICHARD F. DOHERTY, MEMBERWater Control Branch

Engineering Division

I ___

JOSEPH A. MCELROY, MEMBERFoundation & Materials BranchEngineering Division

CARNEY M) TERZIAN, CIIAIRMAN

Chief, Structural SectionDesign BranchEngineering Division

IAPPROVAL RECOMWF4TED:I

I Ot. FYARChief, Engineering Division1

I

PREFACE

This report is prepared under guidance containedin Recommended Guidelines for Safety Inspection of Dams,for a Phase I Investigation. Copies of these guidelinesmay be obtained from the Office of Chief of Engineers,Washington, D. C. 20314. The purpose of a Phase IInvestigation is to identify expeditiously those damswhich may pose hazards to human life or property. Theassessment of the general condition of the dam is basedupon available data and visual inspections. Detailedinvestigation, and analyses involving topographic mapping,subsurface investigations, testing, and detailed compu-tational evaluations are beyond the scope of a Phase IInvestigation; however, the investigation is intendedto identify any need for such studies.

In reviewing this report, it should be realizedthat the reported condition of the dam is based onobservations of field conditions at the time of inspec-tion along with data available to the inspection team.In cases where the reservoir was lowered or drained priorto inspection, such action, while improving the stabilityand safety of the dam, removes the normal load on thestructure and may obscure certain conditions which mightotherwise be detectable if inspected under the normaloperating environment of the structure.

It is important to note that the condition of adam depends on numerous and constantly changing internaland external conditions, and is evolutionary in nature.It would be incorrect to assume that the present con-dition of the dam will continue to represent the con-dition of the dam at some point in the future. Onlythrough continued care and inspection can there be anychance that unsafe conditions be detected.

Phase I inspections are not intended to providedetailed hydrologic and hydraulic analyses. In accor-dance with the established Guidelines, the Spillway TestFlood is based on the estimated "Probable Maximum Flood"for the region (greatest reasonably possible stormrunoff), or fractions thereof. Because of the magnitudeand rarity of such a storm event, a finding that aspillway will not pass the test flood should not beinterpreted as necessarily posing a highly inadequatecondition. The test flood provides a measure of rela-tive spillway capacity and serves as an aid in deter-mining the need for more detailed hydrologic and hydrau-lic studies, considering the size of the dam, its generalcondition and the downstream damage potential.

LITTLE NUGGET LAKE

I

TABLE OF CONTENTS

Page

BRIEF ASSESSMENT

PREFACE

OVERVIEW PHOTO iii

LOCATION MAP iv

REPORT

SECTION 1 - PROJECT INFORMATION 1

1.1 General I1.2 Description of Project 21.3 Pertinent Data 5

SECTION 2 - ENGINEERING DATA 10

2.1 General 102.2 Construction Records 102.3 Operation Records 102.4 Evaluation of Data 10

SECTION 3 - VISUAL INSPECTION 12

3.1 Findings 123.2 Evaluation 14

SECTION 4 - OPERATING PROCEDURES 15

4.1 Procedures 154.2 Maintenance of Dam 154.3 Maintenance of Operating

Facilities 154.4 Description of Any Warning

System in Effect 154.5 Evaluation 15

SECTION 5 - HYDRAULIC/HYDROLOGIC 16

5.1 Evaluation of Features 16

LITTLE NUGGET LAKE

i

TAFLi OF "COtTENTS(Continued)

Page

SECTION 6 - STRUCTURAL STABILITY 18

6.1 Evaluation of StructuralStability 16

SECTION 7 - ASSESSMENT, REC0OMN1ENDATIONS,AND REMEDIAL MEASURES 20

7.1 Dam Assessment 207.2 Recommendations 217.3 Remedial Measures 217.4 Alternatives 22

APPENDIXES

APPENDIX A - PERIODIC INSPECTION CHECKLIST

APPENDIX B - PLAN OF DAM AND PREVIOUSINSPECTION REPORTS

APPENDIX C - PHOTOGRAPHS

APPENDIX D - HYDROLOGIC ANjD HYDRAULICCOMPUTATIONS

APPENDIX E - INFORMATIO:: AS CONTAINED IN THENATIONAL INVNTORY OF DAMS

LITTLE NUGGET LAKE

i i ii I I ~I I l i . - - .J . .. ., , ,

cIF A F)I k t P'.FR r Ni kI I \I.s -r'vi

Loceationl and( D irection oft IIotP!iraI jIiSon oi Figire inl Ap;pendix It

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L

7e: LOCATION OF

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0 10 2000k-/ 1-14 OF DIKE

SCALE IN FEET 7-

LOCATION MAP LITTLE NUGGET LAKE DAM

i

NATIONAL DAM INSPECTIONPROGRAM

PHASE I INSPECTION REPORT

LITTLE NUGGET LAKE

SECTION 1

PROJECT INFORMATION

1.1 General

a. Authority. Public Law 92-367, August 8,1972, authorized the Secretary of the Army,through the Corps of Engineers, to initiate anational program of dam inspection throughoutthe United States. The New England Divisionof the Corps of Engineers has been assignedthe responsibility of supervising the inspec-tion of dams within the New England Region.Metcalf & Eddy, Inc. has been retained by theNew England Division to inspect and report onselected dams in the State of Massachusetts.Authorization and notice to proceed was issuedto Metcalf & Eddy, Inc. under a letter of July28, 1978, from Ralph T. Garver, Colonel, Corpsof Engineers. Contract No. DACW 33-78-C-0306has been assigned by the Corps of Engineersfor this work.

b. Purpose:

(1) Perform technical inspection and evalua-tion of non-Federal dams to identify con-ditions which threaten the public safetyand thus permit correction in a timelymanner by non-Federal interests.

(2) Encourage and assist the States to Ini-tiate quickly effective dam safety pro-grams for non-Federal dams.

(3) Update, verify and complete the NationalInventory of Dams.

LITTLE NUGGET LAKE

d

1.2 Description of 1r-oect

a. Location. The dam is located on :Attle TkIver,a tributary of the French River, Town oCharl*:on, Worcester "'ounty, Fassachusetts ( seeLocation Map and Figure B-1). A small dikeis located west of the dam (see Location r a-and Figure B-2).

b. Description of Dam and Aprurtenances. LIt ,leNugget Lake Dam Is an earthfil dam wi-th adownstream vertical stone face. 7here a-'e nodrawinrs available for thIs dan. A concre'tspillway with mortared stone nasornry tranlnrwalls is located on the right abutmentdam and spillway are about 170 feet long an-the dam has a maximum height of 13 feet. Thespillway Is 20.5 feet wide and the dcwno'reanend of the concrete apron is part.ally mJssing.Flashboards 1..i5 feet high are mcunted -. thecrest. Sidewalls of the spillway are con-structed of mortared stone and are 2.r feet(west side) to 2.5 feet (east side) above thecrest. The spillway discharges into a chan-nel which connects with a separate smallerchannel formed by water seepage apparentlyfrom underneath the dam.

The crest of the earthfil embankment isrelatively flat for most of its length, atabout elevation (El) 772.5. A swale islocated for a length of about 30 feet o~n theeast crest of the dam. The low point of theswale is at El 770.8. The swale serves as anemergency spillway. The axis of the dam isslightly concave upstream. The upstream faceof the dam contains large riprap stones whchmay have been a vertical face at one time.The downstream vertical face is a dry masonrystone wall which bulges in the downstreamdirection. Voids as deep as 2 feet Into theembankment were commonly observed ln theJoints. From the spillway to a poInt ,east of the spillway there is a part," oc eknoll and no vertical stone face. There is alarge pool of relatively clear water thetoe of the dam.

i ~'hmL T ' I. tY 7 ?' . . . . . . . . . . . . . .. . .P,7.

iq

Tne one known outlet structure for the Ia- islocated near the center (see Figure B-,". Theintake consists of a dry stone sluicewaysurrounded by riprap. A threaded valv,. 'te'extends through a metal plate resting or toiof the sluiceway. There is no mechanism a*,the site for opening the gate. The lnvert ofthis outlet is at El 760.1. The verticalstone wall face at the outlet end is mortare,for a width of 5 feet and a height of 5.feet. A leak of approximately I to 2 gpm .ofclear water was discharging from the outletpipe. There are sections of an old deterioratedpipe downstream of the dam and outlet i're.

A dike is located west of the dam. The dikeis 81 feet long and has a maximum height (;f 3feet. The dike is an earthfil] embankmentwith a vertical downstream stone wall whichhas deteriorated.

c. Size Classification. Little Nugget Larce T'amis classIfied in the "small" category since ithas a maximum height of 13 feet and a naxlnunstorage capacity of 119 acre-feet.

d. Hazard Classification. Downstream of the damare two homes, three culverts for a local road,and bridges for the Northside Turnpike and theMassachusetts Turnpike. In the event of' over-topping and complete failure of the dam, a fewlives could be lost and appreciable -ropertydamage could occur. Accordingly the dam !hasbeen classified in the "sIgnifIcant" hazardcategory.

e. Ownership. The dam and dike are located onproperty owned by the Town of Charlton, .lassa-chusetts, Board of Selectmen, Town ]all, MairStreet, Charlton, Massachusetts C1507. "r.

Leonard Haebler, Chairman, Board of -Celectmcn(617-2a8-5668) granted permission to enter theproperty and Inspect the dam and dike. -r orto 1957 the dam was owned by Little NuggfetLake, Inc.

f. Operators. The onl,,.7 known coerator c, thisdam is the Town Highway Superintendent. Thereare no fences around the outlet structure.

'7U '(11'T

t3

g. Purpose of Dam. The earliest records in 192.indicate the dam provided storage water forunknown purposes. The lake and dam now servefor recreation and flood control.

h. Design and Construction History. There are nodrawings available that show the construc-tion of the dam prior to 1924. At that timethe dam was owned by Mr. George m. Wright.Ownership was transferred to Mr. Edwin H. Perryin 1930, then to the Federal Land Bank in 1939,and to Isiah and Annette Newman in 1945. From1948 to 1957 the dam was the property of LittleNugget Lake, Inc.

Previous inspection reports indicate no leakagein 1924. Seepage was then observed in 1930,1938, and from 1964, until repairs were made In1967. Holes and depressions were observed onthe embanknent crest in 1924, 1930, 1938, 1940,1954, 1955, 1956, 1964, 1966, until 1967 re-pairs. One sinkhole in 1938 was 15 by 3 feetin plan dimensions and I foot deep. Sinkholeswere again observed in 1973, one at the gateand one at the spillway. Evidence of p1pingwas also noted in 1973.

Evidence of overtopping the dam was noted in1930, and again in 1933 when sand bags andboards were readied as water came within 6inches of the top. In 1938 a 6-foot wide by2-1/2-foot deep break in the east end of thedam was observed. In 1-955 the embankment wasovertopped for the full length, causing facestones and soil to wash out on the downstreamface. The overtopping washed out a roaddownstream of the dam, reported as the StaffordTurnpike. Flashboards were in place and thegate was Inoperable. The water ]eve] wasobserved at the top of the embankment in twolow places in 1967 prior to repairs.

In 1940, it is reported that the spillway cres,was lowered 2 feet and a core wall placed Iithe embankment. In 1967 and 1968 the dam wa:;apparently repaired and a new concrete cutoffwall 10 feet long was extended underneath the

LITTL, .UGGET LAKEFt14

i

existing cutoff wall. The crest was raised tothe same elevation as the top of stone abut-ment walls at spillway. The miss!ng eastabutment wall on the spillway was also reportedreconstructed and a new gate was ilaced 1-n theoutlet pipe.

i. Normal Operating Procedure. There are nooperating procedures at the dam. There ts oneknown outlet structure controlled Ly a Asidegate located near the center cf *he dan. Theoutlet is reported to be opera,'e, tut has otbeen opened In four y;ars. At * hat t -r van-dais threw rocks loto 'he !nlet, :-r 'wasnecessary tc cean o.ut the :'D es ' os,- *regate. There I.- no handwheo- 0L thLt T1'i,stern. The ster a. v"ars c .ave & re-.'-., ,

protectlve car.

The sp.lwa' f, r . a . :ungated. F, a sh, r xwidth a -e ,a T">:.L''tr.: -moved "'cr. .h. " F " c r1eve. The"

dries ur T c"* ' ..

used fez' -a*' r .

1.3 Pertinent Data

a. Drainage Area. " :' . , "Nugget Lake e !rna', ', , ,, ,(3.05 square rie v . " r!. w' r "oF

the north thr u rugrh, ,' ar.e y ,z',', o: e.iwoodland and swamT. Bes' :r f e. -I.is limited to the "ew "m; r F i cr a.-.east of the lake.

b. Discharge at the ar te. .t" "', i -'-charge at the dam site flows .-er *"helong concrete-faced broad-crest, d weIr at 'hewest end of the dam and ntc t.e streamchannel. The channel is apTrox1F'ately "-etwide 50 feet downstream cf the c ige ro."' hfspillway. The spillway surface Is concretelined and covered mostly with asphalt. Thedownstream slope Is stalled, and the end of

TI TTLE TqGT(,,. A

1C

the concrete apron is missing. The channelis bounded by trees, and contains many stonesand debris. A pool of water at the toe ofthe slope in the center of the main dam dis-charges into a separate channel which joinswith the main channel approximately 200 feetdownstream of the dam. Water dischargingthrough the 18-inch diameter outlet in thedownstream face of the dam contributes to thepool of standing water. The channel flowsthrough three culverts under a road and thenfurther downstream under the Northside Turn-pike and the Massachusetts Turnpike before itdischarges into Pikes Pond. Below Pikes PondLittle River flows through sparsely developedwoodland. The next major population centeris the Town of Webster, almost 5 milesdownstream of Pikes Pond.

Hydraulic analyses indicate that the spillway(without flashboards) and emergency spillwaycan discharge an estimated 300 cfs when thewater surface is at El 771.5, which is theaverage eevation of the crest of the dike,and 150 cfs when the water surface is at El770.8, which Is the lowest point in the eastswale on the main dam. This swale serves asan emergency spillway.

An inflow test flood of 2,06C cfs (one-halfthe probable maximum flood) adjusted for sur-charge storage results in a maximum dischargeof 1,970 cfs. This outflow will overtop themain dam by 1.0 foot, the swale by 2.9 feetand the dike by 2.2 feet. In 1930 and 1933there was evidence of overtopping. Recordsreveale4 the dam was aFain overtopped in1955.

c. Elevation (feet above MSL (Mean Sea Level)).A benchmark was established at El 769.0 onthe crest of the spillway. This elevationwas estimated from a United States GeologicalSurvey (USG) topographic map.

(1) Top dam - Main dam: 770.8 to 772.9- Dike section: 771.0 to 772.2

(2) Test flood pool: 773.7

LITTLE NUIGGET :,AKE

. . .... ... . (

I

(3) Design surcharge (original design):Unknown

(4) Full flood control pool: N/A

(5) Recreation pool: 769.0

(6) Spillway crest (ungated): 768.9 to 769.0

(7) Upstream portal invert diversion tunnel:N/A

(8) Stream bed at centerline of dam: 761.0

(9) Tailwater: N/A (water in downstreamchannel)Tailwater: 759.4 (water in pool down-stream of main dam)

d. Reservoir

(1) Length of maximum pool: 1,500 feet

(2) Length of recreation pool: 1,500 feet

(3) Length of flood control pool: N/A

e. Storage (acre-feet)

(1) Test flood surcharge: 60 at El 773.7

(2) Top of dam: 109

(3) Flood control pool: N/A

(4) Recreation pool: 61 (Approximate)

(5) Spillway crest: 61

f. Reservoir Surface (acres)

*(l) Top dam: 12.8

*(2) Test flood pool: 12.8

*Based on the assumption that the surface area willnot significantly increase with changes In pondelevation from 769.0 to 773.7.

LITTLE NUGGET LAKE

7

(3) Flood-control pool: N/A

(4) Recreation pool: 12.8

(5) Spillway crest: 12.8

g. Dam

(1) Type - Main dam: dry-stone masonryearthfill

- Dike section: dry-stone masonryearthfill

(2) Length - Main dam: 170 feet- Dike section: 81 feet

(3) Height - Main dam: (maximum) 13 feetDike section: (maximum) 3 feet

(4) Top width - Main dam: 22 feetDike section: 7 feet

(5) Side slopes - Main dam: downstreamvertical to 0.25:1;upstream not visible

Dike section: upstream 4:1; downstreamvertical

(6) Zoning: Unknown

(7) Impervious core: Unknown

(8) Cutoff: Poured in two sections - 24 feetlong at top and 10 feet long at bottom -

stepped reinforced concrete wall; shortsection of sheeting in 1938

(9) Grout curtain: Unknown.

i. Spillway

(1) Type: Broad crest

(2) Crest length: 20.5 feet

(3) Crest elevation: East - 769.0 (assumedbenchmark)West - 768.9

LITTLE NUGGET LAKE

8

I

(4) Gates: None, flashboards 1.15 feet high

(5) Upstream channel: Mortared masonry side-walls at spillway, concrete slab coveredwith asphalt

(6) Downstream channel: Downstream face ofweir is spalled and bottom is missing.Below missing bottom is natural channelbounded by rocks. This channel convergeswith the channel created by seepage about200 feet downstream of dam.

J. Regulating Outlets. The only regulating out-let at this dam is the one 3- by 3-foot sluicegate located near the center of the dam. Theoutlet has a capacity of 32 cfs (10.5 cfs persquare mile). The gate has not been operatedin about 4 years, and parts of the openingmechanism are missing.

LITTLE NUGGET LAKE9

SECTION 2

ENGINEERING DATA

2.1 General. There are no drawings available of LittleNugget Lake Dam. Visual observations duringinspection, review of previous inspection reports,and conversations with the Owner and with personnelfrom Town, State and County agencies provided theremainder of the data for this evaluation.

We acknowledge the assistance and cooperation ofpersonnel of the Massachusetts Department ofPublic Works, Messrs. Willis Regan and RaymondRochford, and personnel of the MassachusettsDepartment of Environmental Quality Engineering,Division of Waterways, Messrs. John J. Hannon andJoseph Iagallo.

Also, we acknowledge the cooperation and assist-ance of personnel from the Worcester CountyEngineer's Office, Messrs. John O'Toole, JosephBrazauskas, and Mr. Wallace Lindquist - recentlyretired from county service.

Mr. Leonard Haebler, Chairman, Board of Selectmenfor the Town of Charlton, granted permission toenter the property and inspect the dam.

2.2 Construction Records. There are no as-builtdrawings for the dam. Information on the cutoffwall was obtained from an early County inspectionreport.

2.3 Operating Records. No operating records areavailable for the dam and no daily record is keptof the elevation of the pool or rainfall at thedam site.

2.4 Evaluation

a. Availability. Due to the age of this dam,there is no engineering data available.

b. Adequacy. The lack of in-depth englneeringdata did not allow for a definitive review.Therefore the adequacy of this dam could not

LITTLE NUGGET 1,AKE

]o

be assessed from the standpoint of reviewingdesign and construction data, but Is basedprimarily on visual inspection, past per-formance history and engineering Judgment.

c. Validity. The limited engineering dataavailable is valid for this assessment.

LITTLE NUGGET LAKE

LI

SECT !C.J 3

VISUAL INSPECTION

3.1 Findings

a. General. The Phase I Inspection of the damand dike at Little Nugget Lake was performedon August 31, 1978. A copy of the inspectioncheck list is in Appendix A. Periodic inspec-tions of this dam have been made by otherssince 1924. A partial listing of these in-spections is in Appendix B. An inspection bythe Massachusetts Department of Public Workswas made in 1972 and 1973, and a copy of thatreport is also included in Appendix B. Inaddition, earlier inspection reports were re-viewed at the Worcester County Engineer'soffice.

b. Dam. In general the dam is in poor condi-tion. The downstream vertical stone face hasbulged outward between the knoll and theoutlet pipe; and the unmortared Joints be-tween many of the stones indicate voids backinto the earthen embankment. A large pool ofrelatively clear water immediately down-stream of the dam indicates considerableseepage through or underneath the dam. Thereis a surface depression near the outlet struc-ture west of the swale. A flat filled area isexposed on the northwest corner of the damnext to the spillway.

The area at the downstream toe is completelycovered with brush and trees. There is slightto moderate riprap protection of the upstreamslope.

c. Appurtenant Structures. The concrete andstonework of the spillway are in poor to faircondition. Pieces of the downstream end ofthe mortared stone masonry east training wallare dislodged. Some of the mortar of thespillway sidewalls is missing or has cracked.At the time of the inspection, water wasflowing over

LITTLE NUGGET :AKE

12

the flashboards. The concrete facing of thespillway is eroded away, and there are localareas of spalled concrete. Evidence of slightto moderate seepage was observed at thedownstream edge of the apron where surfaceconcrete has been completely eroded, exposingunderlying stones. The subsided groundsurface adjacent to the west spillway sidewallhas been filled in with leaves. The down-stream channel is relatively clear except fora few overhanging trees and small tree trunksand logs in the bottom of the channel.

The outlet structure is in fair condition.The inlet is not visible. The inlet to thegate structure is a dry stone masonry wall. Agate stem extends through a metal welded plat-form mounted on top of the masonry walls. Thewheel is missing and the gate is reportedly 3feet by 3 feet. The gate stem is reportedlyoperable. The gate was last opened four yearsago. The Owner indicated that vandals threwrocks into the inlet and it was necessary toclean out the rocks to close the gate. Forthat reason the reservoir surface is nowregulated by removing flashtoards from thespillway.

The outlet structure is in good conditi on.The outlet from the gate structure is an 13-inch diameter corrugated metal pipe reces-edinto a mortared vertical stone wall whichblends into the unmortared downstream stonewall. There is leakage from the outlet pipeestimated at I gpm. A small deflector stone-wall extends 4.5 feet downstream of the outletpipe.

d. Reservoir Area. Moderately populated areas3residential development are located on 'heeast, north and south sides of the lake.

e. Downstream Channel. The discharge fror thespillway flows down Little River before -tflows into Pikes Pond. About 1,000 feet down-stream of the dam, the Little River crossesunder a road through three culverts wtth dta-meters of 3 feet, 3 feet and 2.5 feet.

LITTLE I GFT LjKE

" = 'III I I I I III .. ... . . . ..3

3.2 Evaluation. The above findings indicate that thedam has several areas of distress that requireattention. It Is evident that the dam is notadequately maintained and that deterioration willcontinue unless action is taken. Recommendedmeasures to improve these conditions are includedin Section 7.

LITTLE NUGGET LAKE

-4

SECTIO1' 4

OPERATING PROCEDURES

4.1 Procedures. There are no operating procedures atLittle Nugget Lake Dam.

4.2 Maintenance of Dam. There is no systematicmaintenance program at the dam.

4.3 Maintenance of Operating Facilities. The out-let gate is closed and cannot be opened with theexisting available mechanism. Flow over thespillway is controlled only to the extent thatflashboards are removed.

4.4 Description of Any Warning System in Effect.There is no warning system in effect at the dam.

4,5 Evaluation. Little Nugget Lake Dam is in poorcondition and has been placed in the "significant"hazard category because of the possible danger tolife and property downstream. For this reason, itis important that procedures for operation,maintenance, and emergencies be Implemented asrecommended in Section 7.

L:TTLE NUGGET LAKE

15

SEC'T'0N 5

HYDRAUL I C/HYDROLOGT7C

5.1 Evaluation of Features

a. Design Data. The Probable Maximum Flocd(PMF) rate was determined to be 1,350 cfs persquare mile. This calculation is based onthe average drainage area slope of 2.5 per-cent, the pond-plus-swamp area to drainagearea ratio of 13 percent, and the U. S. ArmyCorps of Engineers' guide curves for :*.ax'mnurProbable Flood Peak Flow Rates (datedDecember 1977). Applying one-half the F!," tothe 3.05 square miles of drainage arearesults in a calculated peak flood of 2,.1,1_cfs as the inflow test flood. By adjustingthe inflow test flood for surcharge storage,the maximum discharge rate was established as1,970 cfs, with a water surface at E 773.7.

Flow over the crest of the dam and the dikeis predicted to be 1,06C cfs, and flowthrough the spillway (without flashboards";and emergency spillway (swale area on maindam) would be 910 cfs. The maximum head onthe dam would be 1.0 feet, and 2.9 feet inthe swale area wlth a discharge of 382 cfsper foot of width. Depth at critical flowwould be at 0.60 feet with a velocity of ".3 3feet per second.

Flow over the crest of the dike is predic-edto be 666 cfs. The maximum head on the dikeis 2.2 feet with a discharge r' 8.32 cfs ,erfoot of width. Depth at critilcal flow '.;woulbe at 1.29 feet. with a velocity o" ". f. -

per second.

Hydraulic analyses indicate that the zr-lllway(without flashboards) and emergency ':! .w; Y(the swale) can discharge an estimated 3CCcfs when the water surface Js a' El 772.],which is the average elevation of the -,restof the dike. The spill-ways can dlschar-eonly 15 percent of the test outf' ow Leforethe dam is overtopped.

nTTL[L JUCU, ETAKE

i

b. Experience Data. Hydraulic records are notavailable for this dam, however, Informaticrsupplied by the County Indicated there wasevidence of overtopping the dam- in 193C arnd1933. In 1955 the embankment was overtoTrTedfor the full length.

c. Visual Observations. Discharge from LittleNugget Lake is over the spillway located onthe west end of the main dam. The spillway isa 20.5-foot long broad crested weir.

The concrete spillway is in poor to fair con-dition; it is severely pitted and the down-stream edge Is missing. The west end of theweir is 0.1 foot lower than the east end.

d. Overtopping Potential. Overtopping of the damby about 1.0 foot, overtopping of the swale byabout 2.9 feet, and overtopping of the dike by0about 2.2 feet is expected under the outflowtest flood of 1,970 cfs. In the event of over-topping, complete failure of the dam and dikecould occur.

Failure of the dam would produce a peak dis-charge of 3,400 cfs and a flood wave 6.5 feethigh, at a point 700 feet downstream of thedam, as estimated using the Corps of Engineerscriteria.

SECTION 6

STRUCTURAL STABILITY

6.1 Evaluation of Structural Stability

a. Visual Observations. The evaluation of thestructural stability of the dam is based on thevisual inspection conducted on August 31, 197J.

Based on the observations as discussed inSection 3, Visual Inspection, it is recom-mended that a more detailed investigation beinitiated to evaluate the stability of the damand the seepage at the downstream toe.

b. Design and Construction Data. Discussionswith the Owner and County and State personnelindicate there are no available plans, speci-fications, or computations on the design, con-struction, or repair of the dam. Informationon the type, shear strength and permeatilityof the soil and/or rock materials is non-existent.

c. Operating Records. There is no evidence thatany type of instrumentation has ever existedat Little Nugget Lake Dam. The performance ofthe spillway and dam under prior loading canonly be inferred from physical evidence at thesite.

d. Post-construction Changes. The only recordedchanges after 1924 were repairs undertaken bythe Owner in 1940 and 1967-1968. In 1940 thespillway crest was lowered 2 feet, the apronpartly paved with concrete; and a core wallwas placed. In 1967 changes included piacin.gconcrete on the spillway crest and filling alarge hole on the downstream end of the crest;removing the center spillway pier, and tlacink:a 10-foot long concrete cutoff wall. in i96changes included replacing the missingdownstream end of the east spillway atutmen',wall, raising the main dam to the sameelevation as the top of the stone abutment

LTT'Lr :,UGG" LT LAKEt1

walls at the spillway, replacing missingstones on the upstream and the downstream damface; and replacing the gate in the outletstructure.

e. Seismic Stability. The dam is located inSeismic Zone No. 2 and in accordance withPhase I "Recommended Guidelines" does notwarrant seismic analyses.

LTTTLE NUGGET LAKE

19

• ii ... . l i i iA

SECTION 7

ASSESSMENT, RECOMMENDATIONSAND REMEDIAL MEASURES

7.1 Dam Assessment

a. Condition. Built prior to 1924, LittleNugget Lake Dam was neither designed nor con-structed according to current approved state-of-the-art procedures. Based upon the visualinspection, the limited engineering data, andno evidence of operation or maintenance pro-cedures, it is determined that various defl-ciencies must be corrected to assure thecontinued performance of this dam. Generally,the dam is considered to be in poor condition.The principal areas of concern are: seepageat the toe of the dam; outward bulging of thevertical downstream stone wall; deep voidsextending into dam through open Joints betweendownstream wall stones; an inoperable slidegate; spalling and missing concrete on theweir; lack of adequate riprap protection onthe upstream face of the dam and the dike;erosion caused by surface runoff at the knollleft of the spillway on the downstream slope;vegetation on the upstream slopes of the damand thick vegetation immediately downstream ofthe dam; and lack of competent fill behind thewest training wall of the spillway.

Hydraulic analyses indicate that the existingspillway (without flashboards) and emergencyspillway can discharge a flow of 300 cfs whenthe water level in the lake is at El 771.5,which is the average elevation of the dike.The spillway may be inadequate since it candischarge only 15 percent of the test floodbefore the dam is overtopped. An outflowtest flood of 1,970 cfs will overtop the dikeby 2.2 feet, the main dam by 1.0 foot, and2.9 feet at the swale.

The limited info iatlon available indlcatesthat In 1930, 1933 and 1955 water overtoppedthe dam.

LTTL2I. NUGGET LAKl*

2 C

b. Adequacy of Information. The lack of in-depthengineering data did not allow for a definitivereview. Therefore the adequacy of this dam andwest dike could not be assessed from thestandpoint of reviewing design and construc-tion data, but is based primarily on visualinspection, past performance history andengineering judgment.

c. Urgency. The recommendations and remedialmeasures outlined below should be implementedby the Owner within one year after receipt ofthis Phase I Inspection Report.

d. Need for Additional Investigation. Additionalinvestigations to further assess the adequacyof the dam and spillway are outlined below InSection 7.2, Recommendations.

7.2 Recommendations. In view of the concerns over thecontinued performance of the dam, dike and spill-way, it is recommended that the Owner employ aqualified consultant to:

a. evaluate the stability of the dam

b. conduct a more detailed hydrologic andhydraulic investigation of the site to designan adequate spillway

c. evaluate the seepage at the downstream tce ofthe dam.

The recommendations on repairs and maintenanceprocedures are outlined below under Section 7.3,Remedial Measures.

7.3 Remedial Measures

a. Operating and Maintenance Procedures. The damand spillway are not adequately maintalned.It Is recommended that the Owner accomplishthe following:

(1) repair the gate mechanism to make heslide gate operable,

(2) repair and replace where mssing, the ccn-crete on the weir and replace the missingend of the east training wall

ITTLK' U "p L2']

j

(3) add riprap on the upstream face of Thedam and west dike,

(4) remove all trees and brush from the p-

stream face and crest of the dam and 'hedike,

(5) remove all trees and brush downstrea: U'the dam,

(6) institute a definite plan for surveil-

lance and a warning system during periodsof unusually heavy rains and/or runoff.

The warning system should be coordinatedwith one at the upstream reservoirs in

the watershed, because flooding orfailure of the upper dams will have asevere effect on Little Nugget Lake,

(7) implement a systematic program of main-

tenance inspections. As a minimu:n, theinspection program should consist of a

monthly inspection of the dam and appur-

tenances and be supplemented by additicn-al inspections during and after severestorms. All repairs and maintenanceshould be undertaken in compliance withall applicable State regulations.

(8) technical inspection of this dam should-

be continued on an annual frequency,

(9) remove miscellaneous fill of leaves, etc.

outside the west training wall of thespillway and replace with compacted soil,covered by loam, and then seeded.

(10) clear all debris from the spillway and

downstream channel.

7.4 Alternatives. An alternative to implementinrg The

recommendations and remedial measures listed abovewould be to drain the pond and breach or remove

the dam. This could be an undesireable alterna-tive, causing the lowering of the groundwater

around the lake resulting In a deleterious effecton the local water wells.

LITTTLE, NUJG H1 1A

APPENDIX A

PERIODIC INSPECTIONCHECKLIST

LITT.LE' INUCCET LAKE

HTT

fZ'c5nr ctpczg____

baA~ vc C.t

PEkxIODIC lNSPECTION CHECK .V

T Lidle K;Lmacr k~Lde :<vrE 8 - I -- 7

* .. ':TEE tDC -d NAME i-o Lcrscf'i

&> ~ (-ecI -e c h el Ca I 'JA711E ________

d.EAEVAL71ATED CONDITIUi.

oc. Elievatlion r~c

)iindment tc Date

Cracks

e-r1U povemeA4)t - r5carex 4,11 o.~,':'C '~t iOndi t i n I I e. 'f s 1% Loc~ckI e~-' C') f-1 ,t

t.-' or clt l m no Crest vtt (7"-1 Ic t e, 5 C C

eral M4ovement 2. n'e Cirews5 Ils 4-ic~ e - le- 4 Y - 1rzul 11 oce - rrcVX stuiftid C.44hvr ,,-t5

*>riztial Alinment

oiitlion at Abutment and at e~4 ~~irC .- (BColcrete Structures 3ras(-Ce +iIt Sfb'tI1UtcLt

Indications of 'Movement ofsyUtrT tr-.tructuraliItems on Slopes 5f1{trt,*es

:'~~~passing onIlxu SlpS focfeafh C,,)W CboI'e.r.. _passng on )Ioposon Ief* bkeIcL. ells L.tCI

C-icughin4 or Erosion of Slope-, Dcxa-,veeltc4 Sf).Jeff- e

oAbutmentse-.dcecf-& c' -lg .a

Ec "liope Protect ion - Riprar -(f., Yrtf)

0 i ore. P, pyJv-zp !4Ilop( 15' e.+txv~ -_Cc C4 .-$frIrC

nhi ;a'l Vovemoft -r :racklnf- at F~e~o -, Nop b)C.(rS 5Ci4+Pred C% ~1t C4 O'Sk fo'k

rnar 'Foes noL vsbIWwe+ rea5 Ij- o foe, eeeTPo r e

;n-, sual Embankment or Down~treaml L<i ~t. c-,F.uIIFCI srefpd ilo-. ci-

Ill+-ll JG I ft 3C, !sp'iI.c.1c ft2

"'o:r-dati n Dra~ nage i-eat ores '10fle VisA'Ie

'i~l..., une_____ ----- _ __ - 4-- -

-~ .; . flC-e

--- ________~~~~ L---------- -

PERIODIC I JP EC'l ("I CH ED

P>": -ATvIhE d i ke. AIME i M L r sc-n

21 PL I N E C-eo t-fvhroclo IIA ME______ ____

AHEA EVA L!12ATED CX

DID:! EFNKMENT

'urrent Pool Elevat ion

..'tx'mum Impoundment to Date

.'ur face Cracks none

,iement Donidit Ion 010a cr-e~f k n.

.. :~-r~ntoil Settlemenit of Crest w~Wi ~~

Dteral Mlovement

(jr*ni Cal AignmentI

'o n1o ecwreak ear+~ 4 Outmiid, 1,e tin(it ion at Abutment and at jrA O~e.-qV-. W-0) 5,yel treesncrete Structures ~~j et~~r~

ilcat ions of Mev~vement of.*ructural Items on .;liopes

--'spasslng on JDi;~~fTlr c

2 og~gor Erosion of Slopes onr~rAbutmento'

riu.,_a '.'v2m ~ t or~ 'r C I.1f . )1

,r, :,ear Toec I

*r~mL~in1~mD.nt o .,cwnz oez fr f A(v .,EPrwurj* * t'ut'

~~~at~~~ ho>n A'itr r l~l

I )(

PERiIODIC INSPECTITON ,RECK 1151":

PROJECT 1-itffe Ixq3fLnec 7-E, J - 3K

PROJECT FEAT'URE O~xkt 4- uuo 5 SA;M ".'Lcr~('

DISCIPLINE C:ecieehoical N AM E_________

AREA EVALUATED CCXIII>

I I''LE-T WORKS - INTAKE CHANNEL ANj)

7 A-E TRU CT UREF

uApproach Channel noVt v15,bC.

Slope Conditions

R ottom Conditions

Rock Slies or Falls

LeCg Boom

cr.Jl lot c~cnr~:enc Cc~-ee

-iop -C: a2n'l S_______

-rn -nV e-tY 5VAture b9LA 4- AJ drij 5tcf~e ryncq soj n ~ a &Icrt

6z"-) ec~)tye Q'K' 0 ek ( C) re.-n -rf 4 dI) t r(I cLck)Ce-(Le

!ri~rV&n flt vsk'

&__Cc t-c hni on I s' __

-2 r a DtzY, I~cU fctCe crhp*, ~f trie eee - ~

no ne

e i~ ~ r,&r1 fo& r c -i r - 2

~~tq J f~ r 1eF+ KLFOf rICrCd 44-r h

_____ _____ ___ _ _____ _ -I 4 -Iox- t. 5ee(o? OL A '

Pp! iC5 et ea'cic-d (.vonrw(. Ccv~on r~c C C-) )t U C &X I In(rf

cosl ~ ~ ~ ~ ~ ~ A c.:i(,lf3clb ,IH

L~*1L~tiqet Ld~C 3Ism

tL~CCL~ __________ _______

~~~~3 -i -_i__ _? n____

dC'A~~~~ir 0 -s f________ n. r L

~ A

!- :,anne C I C-le L"'C t,~'. (cv,

a.,-,! ~ l e f )c , f (Y c. xr P, 4 tg Ccy rc f~

an (ra ine Wa 1~ (i>,.LV 10Ci'Cl Ct A. C11 k

OlI, Cd r C Q k nk- CA C sA

nc larr ncnl

4~ )t~l t'ictct~f 1VC, ~ ~ *'~ittV, .. ~ o cit~ tl C, e.-Ie 1(

r(-.C' irr - 4h (-T I rc (jel ok C'n 01l( (d Y, 1 N3(I1

APPENDIX B

PLAN OF DAM AND PREVIOUSINSPECTION REPORTS

Page

Figure B-1, Plan of Dam, Spillway and Sections B-1

Figure B-2, Plan of Dike and Section B-2

Previous Inspections (Partial Listing) B-3

Inspection Report by Massachusetts Departmentof Public Works, February 1972 B-5

Inspection Report by Massachusetts Departmentof Public Works, September ]973 B-7

Letter Report by Massachusetts Department ofPublic Works, September 1973 B-13

LITTLE NUGGET LAKE

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NATIONAL PROGRAM OF INSPECTION OF WON FED DAMS

LITTLE NUGGET LAKE DAN

F I P1 &I I KMI OF SAN I SCT I OS

SCALi 20, ~ 3Ti -01Sf *?

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S L I' - 1ill. lTl

1.

Iat~ all in, m slam, (sill D$1¢msm am

I~1 F|: IJR S- I0' ]FDITKE A~ I , I1WS

SCl: * I IAE IosImI III

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.lNSPECTO " REPORT & DATA FOR DAMS Doim 1 T '-. _-9'Town:

Owner: .. .. Strek:_I x-His .Address: o -F - Pond:~,/ /j~. L,

Fu nction of ,.am: -.. - :Date*: / -' :

I t6c 'tion-& Access'io-k ,/£_'Wi ,,. s CONDITIoN rATo -

tCd 04 -s/J c 7-r ej-~ AfIL-L ~~~ Structural: ~~7PT USGS Quad.tcice~te- Lat. , Lon" Hydraulic: ' '. '

I ,-Drain.Ar.:JjoL Sq1i. v Pohds:. ao.;Res. m:_ General:

*9 Asoll-h8rac ter of 7A:-PRIORlITYC

'Estimated'Discharge .rCapacity:_Ueneral Description of Dam and Discharge Control

.

5- yE,,.,-' 'Ix'' .... '_ " K - -i"L, -J,<, .l44' " / <"'4*l<_

3ketch (Not 'to Scale): A . / ( L/

( ",. 1- 5

r3/

Rate C ./' omment ".

.... r 'and comen Not io V- I: .- .. '.... T-"'

I, r I,

411 X 12

/r.

Da No,I fIL

INSPECTION REPORT - DA;S Ai.D R.ESERVOIRS

1. Location CMD7./Tovin CFrlThtr' _ Dan

Name of Dam 7 Inspected by_

Date of Inspection .

2. Owner/st pert Assessors Prev. Inspection 2-16-72

Reg. of Deeds Pers. Contact

1. Town cf Charlton Charlton Mns-. OYC7Name St. & No. City/Town 6tate Tel. No.

2.Name St. & iNo. City/Town State Tel, Wo.

3.,

Name St. & 1o, City/Town State Tel. No.

3. Caretaker (if any) e.g. superintendent, plant manager, appointed

by absentee oviner, appointed by multi owners.

Names Board of Selectmen St- & NO.s Town Hall Charlton

MZWAwns Charlton State; yass. Tel.Ho. :

4. No. of Pictures taken no e

5. Deqree of Hazards (if dam should fail completely)w

1. Minor X 2. Mioderate

3. Severe 4. Disastrous

* This rating may change as land use changes (future development)

6. Outlet Control. Automatic Manual X

Operative yes; No.

Comments: Water level corntrolle by fl&Ehboards at spIlIv;ny.

7. Upstieam Face of Dam Conditions

1. Good 2. Minor Repairs X

3. MaJor fepairs 4. Urgent Ilepairs

.no.Comrnents3 Irry stcnyT face d. ricritir. bL-Awe ni +iioa I r

"* -2- DIJ.; WO. ______

8. Downstream Face of Dam:

Conditions 1. Good X 2. M inor Repairs

3. Major Repairs _ 4. Urgent Repairs

Commentss

9. Emergency Spillway: I'cr.e "

Condition& 1. Good 2. Minor Repairs

3. Major Repairs 4. Urgent Repairs

Comments: -," dre'down gate

10. Water Level at time of inspection: 6"Ft sp fez ove X below

top of dam __ principal spillway. X

other

11. Summary of Deficiencies Noted.

Growth (Trees and Brush) on Embankment r.one

A~irmal Burrow s .,rt--W~ho- (2) 1 at gate I .t EA ]J.v

Damage to slopes or top of dam .ry 'tcr ;.'" ( Fr.cr)

Cracked or Damaged Masonry Cfl'. CrcC-rc at spi]a2,Ay

Evidence of Seepage none

Evidence of Piping yes )j . 'tz, /1, 3

Erosion Vinor erosion dcwnstrea:- ficc

Leaks none

Trash and/or debis impeding flow at .pIlHwzy outlet

Clogged or blocked spillway none

Other t 1(i 1il

12. Remarks & Recommendationss (fully Explain)

Debris should be removed from spillway outlet.

~ ~r-iep&IT-e- he ( y Y 0 an)

to the vertical face of the upstream dry wall.

* There is some evidence of piping and a later inspection will be made.

Ip

13. Overall Condition:

.1. Safe X

2. Minor repairs needed vp.trv, rl i.ce & :arhouts

3. Conditionally safe -major repairs necdel 0

4. Unsafe r0

5. Reservoir impoundment no longer exists (explain)

Recommend removal from inspection list

DESCRIPTION OF DAA

DISTRICT l

Submitted by George D. Prodeur Dam No. 3-1|f-E+-

Date Sept. 1+, 1971 Wit/Town Charltcn

Name of Dam Little 11kgpet lake

1. Locations Topo Sheet No. 21 A

Provide 8-" x 11" in clear copy of topo map with location ofDam clearly indicated.

2. Year built: ____Year/s of subsequent repairs

3. Purpose of Dan: Uater Supply Recreational X

Irrigation Other

4. Drainage Areas 3.C6 sq. mi . ... acres

5. Normal Ponding Area: 12 - acres; Ave. depth

Impoundments gals.; acre ft.

6. No, and type of dwellings located adjacent to pond or reservoir

20 iae. summer homes, etc.

7, Dimensions of Dam: Length Max. Height

Slopess Upstream Face Vertlrl-'

Downstream Face V 4c-

Width across top ZL]'

8. Classification of Dam by Material:

Earth =L Conc. Masonry Ejillw'iv Stone Lasonry X

Timber Rockfill Other

9e A. Description of present land usage downstream of dams

. rural; 2C5 % urban.

B, Is there a storage area or flood plain do-.nstream of dam whichcould accomodate the impoundment in the event of a completedam failuree? yes X no _

i H-ic

DAN 14O.

10, Risk to life and property in event of complete failure.

No* of people

No* of homes _

No. of Businesses none 0

No& of industries none . Type

No. of utilities none . Type

Railroads none ,

Other dams 3-1-54-;4 &

Other Notthside Turn;ike & Vi sschu Fett s urnpike

11, Attach Sketch of dam to this form showing section and planon 8-;," x 11" sheet.

12. How to Locate-

0.35 miles Northwesterly on access road off

Northside Turnpike (opposite ?illward Road)

q

L -i

-- 57

.2.7.

-w o

September 12, 1973Ir1 /

i, oBoard of SelectmenTom*a HalCharlton, Massachsetts

Ch Ito

Litae tigget Lake Dam

An engineer fram the Mauadusetts Department of Public Workshas inspected the above dam, owned by the Town of Charlton.

The Inspection wan made in accordance with Chapter 253 of the Mass-achusetta General Laws, ab-aended by Chapter 595 of the Acts of 1970.

The results of the inspection indicate that this dam is 3afa; how-ever, the following conditions were nobed that equire attention.

I* Tuo settleont or sinkholes, located at the gate and at thespiliVay, should be investigated and corrected and repaired asneeded.

2. Tn upstream face of the dry atone wall between the spilwayand the gate is deteriorated and niods rebuilding.

3. Remove the accumulation of debris from the spillway.

We can those conditions to your attention now, before they becomeserious or more expensive to correct.

Very tru13 yours,

WILLIAM E. MlIAHM, P.E.,z9_v Acting Daputy Chief nzigieer

LRVafsccCe: S. C. Waruzila AotixnS DW3

Dme and Reervoir Lgr. Diat#3

hA

APPENDIX C

PHOTOGRAPHS

LITTLE NUGGET LAKE

NO. 1 UPSTREAM VIEW OF SPILLWAY

NO. 2 VIEW OF SPILLWAY FROM D)OWNSTREAM TOE

NO,.3 VIEW OF DOWNSTREAM WALL OF D)AM

NO. 4 VIEW OF DIKE

C-2)

APPENDIX D

HYDROLOGIC AND HYDRAULICCOMPUTATIONS

LITTLE NTUGGET LAKE

Project ANa+ Review~.. Of Jj' eAi' E)~ Acct No. 3. Pag ..L o'

Subject WAovc Qs~eA M ~c A 'e Comctd, By Date 11.Z7

Dal OrTLe NUQGG( LAKE~A OWcud.____ Date /1017

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Subject Wicvceile-A~m~ Area. compjt By Z-f7,

Detail LI1TL~ C- /uc&E7 L14I<C-EDAAI Ck d By MLU / /-a

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Project A(iN .g i

Subject MJV e4 Y anJ. Aireg, compd By f -. .iie t__0______

Detail L1-rTTLE_ Aj((L- iAkE D ~ Ck k1ByL 1 ~it /10/76

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774P,7737

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Project NOL, %'view ej AMo- icSl. VC 44UNo CA Paige o __

Subject WnresCer Mc Area Compid BY DRile of /78DealL r tTL~ E bC~ . LAk WE M Ck ( Hy ________ ite - '

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Project AAM4 Feti4~ fJ Daf Acct No P'D Pje 0of

Subject 0 V CS~~e cAt~ igJ Co ,,d L!E... Dite

Detail I. ITrEN0C &.AKE DAMA Ck ci By - - Odt 1-7 ~

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(w)oS = 34oc. o " =

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2-~ 1 60 2,28,/3

U. A RM/ V Q)IS is- . o (44 2 "z '

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APPEN~DIX E

INFORM~ATIONl AS CONJTAINED IN THENATIONAL ITNENTORY OF DAMS

LITTLE NUGGET LAKE

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