Poquonnock Reservoir Dam

High HazardSatisfactory ConditionEmergency Action Plan: Yes

Location

StateConnecticut
CountyNew London
Nearest CityGROTON
River/StreamGREAT BROOK
Coordinates41.35052, -72.03651

Physical Characteristics

Dam TypeEarth
NID Height18 ft
Dam Height18 ft
Dam Length290 ft
Year Completed1901 (125 years old)

Storage & Hydraulics

NID Storage1,660 acre-ft
Max Storage1,660 acre-ft
Normal Storage921 acre-ft
Surface Area139 acres
Drainage Area15 sq mi
Max Discharge1,160 cfs

Ownership & Safety

PurposeWater Supply
OwnerCity of Groton
Owner TypeLocal Government
Hazard ClassificationHigh
Condition AssessmentSatisfactory
Last Inspection02/15/2023
Emergency Action PlanYes

Identifiers

NID IDCT00231
Federal IDCT00231
More InfoState Dam Safety Program

Nearby Dams

Poquonock Lake Dam 0.5 mi Low Poheganut Reservoir Dam 0.8 mi Significant Ymca Pond Dam 2.8 mi Low Ledyard Reservoir South Dam 3.1 mi Significant Morgan Pond Dam 4.2 mi Significant Perry Pond Dam 4.3 mi Significant Brandagee Lake Dam 4.7 mi Significant Smith Pond Dam 5.2 mi Significant Mystic Reservoir Dam 5.3 mi High Jordan Mill Pond Dam 5.5 mi Low