Amoskeag

High HazardFair ConditionEmergency Action Plan: Yes

Location

StateNew Hampshire
CountyHillsborough
Nearest CityManchester
River/StreamMerrimack River
Coordinates43.00220, -71.47230

Physical Characteristics

Dam TypeConcrete
NID Height29 ft
Dam Height29 ft
Dam Length1,075 ft
Year Completed1921 (105 years old)

Storage & Hydraulics

NID Storage4,320 acre-ft
Max Storage4,320 acre-ft
Normal Storage4,320 acre-ft
Surface Area478 acres
Drainage Area2,854 sq mi
Max Discharge87,000 cfs
Spillway TypeUncontrolled

Ownership & Safety

PurposeHydroelectric
Owner TypeNot Listed
Hazard ClassificationHigh
Condition AssessmentFair
Last Inspection08/06/2025
Emergency Action PlanYes

Identifiers

NID IDNH00102
Federal IDNH00102
More InfoState Dam Safety Program

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