Weston

Upper Ammonoosuc River· Coos, New Hampshire· Built 1987· Timber Crib· 20 ft tall
Low Hazard Hydroelectric Private

Key Takeaway

Weston is classified as low hazard in New Hampshire. It was completed in 1987 and is 39 years old. Its primary use is hydroelectric.

Physical Details

Dam Height 20 ft (taller than 70.9% in NH)
Dam Length210 ft
Dam TypeTimber Crib
Max Storage275 acre-ft
Normal Storage275 acre-ft
Surface Area30 acres
Drainage Area263 sq mi
Max Discharge14,250 cfs
Year Completed1987 (39 years old)
NID IDNH00369

Safety Information

Low Hazard

No probable loss of human life and low economic/environmental losses expected.

Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?

Emergency Action Plan: No
Last Inspection: July 15, 2022
State Regulated: Yes
Regulatory Agency: NHDES DAM BUREAU

Ownership

Powerhouse Systems

Private

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Groveton Municipal Lagoons Dam

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Brooklyn

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Israel River Dam

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Stratford Bog Pond Dam

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Maidstone Lake

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Low Hazard 12 ft

Little Bog Pond Dam

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Lower Trio Pond Dam

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Frequently Asked Questions

What is the hazard classification of Weston?

Weston is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates Weston?

Weston is owned by Powerhouse Systems (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Weston built?

Weston was completed in 1987, making it 39 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.

What is the primary purpose of Weston?

Weston serves the following purposes: Hydroelectric. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Weston?

Weston has a dam height of 20 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.

When was Weston last inspected?

Weston was last inspected on July 15, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.

Data from the National Inventory of Dams (NID) maintained by the US Army Corps of Engineers. Dam conditions may have changed since the last update. This site is not affiliated with USACE. Do not use for emergency planning — contact your local dam safety program.