Squannacook River Dam

High HazardFair ConditionEmergency Action Plan: Yes

Location

StateMassachusetts
CountyMiddlesex
Nearest CityGroton; Shirley
River/StreamSquannacook River
Coordinates42.60259, -71.62774

Physical Characteristics

Dam TypeConcrete
NID Height18 ft
Dam Length150 ft

Storage & Hydraulics

NID Storage110 acre-ft
Max Storage110 acre-ft
Normal Storage75 acre-ft
Surface Area20 acres
Drainage Area1 sq mi
Max Discharge1,400 cfs
Spillway TypeUncontrolled

Ownership & Safety

PurposeRecreation
OwnerGroton Land Holdings, Inc.;Town of Groton
Owner TypeLocal Government
Hazard ClassificationHigh
Condition AssessmentFair
Last Inspection05/05/2023
Emergency Action PlanYes

Identifiers

NID IDMA00442
Federal IDMA00442
More InfoState Dam Safety Program

Nearby Dams

Hollingsworth & Vose Company Dam 0.8 mi Low Ice House 3.5 mi Low Plow Shop Pond Dam 3.5 mi Low Hickory Hills Lake Dam 3.7 mi High Upper Flannagan Pond Dam 3.9 mi Significant Lake Shirley Dam 4.1 mi High Townsend Harbor Dam 4.1 mi Significant Balch Pond Dam 4.3 mi Significant Balch Pond Dike 4.3 mi Significant Long Pond Dam 4.9 mi Low