Calef Lake Dam

TR MERRIMACK RIVER· Rockingham, New Hampshire· Earth· 8 ft tall
Low Hazard Recreation Private

Key Takeaway

Calef Lake Dam is classified as low hazard in New Hampshire. Its primary use is recreation.

Physical Details

Dam Height 8 ft (taller than 5% in NH)
Dam Length215 ft
Dam TypeEarth
Max Storage175 acre-ft
Normal Storage132 acre-ft
Surface Area38 acres
Drainage Area1 sq mi
Max Discharge119 cfs
Year Modified1997
NID IDNH01021

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: May 2, 2022
State Regulated: Yes
Regulatory Agency: NH DES

Ownership

HIDDEN TRAILS VENTURES INC

Private

Nearby Dams

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Harantis Lake Dam

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Clark Pond East Dam

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Tower Hill Pond Dam

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Massabesic Lake Dam

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Beaver Brook Dam

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Deep Hole Pond Dam

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Hoods Pond Dam

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Frequently Asked Questions

What is the hazard classification of Calef Lake Dam?

Calef Lake Dam 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 Calef Lake Dam?

Calef Lake Dam is owned by HIDDEN TRAILS VENTURES INC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

What is the primary purpose of Calef Lake Dam?

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

How tall is Calef Lake Dam?

Calef Lake Dam has a dam height of 8 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 Calef Lake Dam last inspected?

Calef Lake Dam was last inspected on May 2, 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.