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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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Ds___ u ion __
ii Availobility Codes[ RAvail 011/or
Dist Spcial
_ __ CodesAvai IaId/oIr
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
r
[-I- • i II I l - l i'
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
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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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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[ *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
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