Pembroke

Suncook River· Merrimack, New Hampshire· Built 1891· Masonry· 26 ft tall
Low Hazard Hydroelectric Private

Key Takeaway

Pembroke is classified as low hazard in New Hampshire. It was completed in 1891 and is 135 years old. Its primary use is hydroelectric.

Physical Details

Dam Height 26 ft (taller than 83.1% in NH)
Dam Length108 ft
Dam TypeMasonry
Max Storage34 acre-ft
Normal Storage34 acre-ft
Surface Area1 acres
Drainage Area259 sq mi
Max Discharge1,848 cfs
Year Completed1891 (135 years old)
NID IDNH00377

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 25, 2022
State Regulated: Yes
Regulatory Agency: NHDES DAM BUREAU

Ownership

Pembroke Hydro Associates

Private

Nearby Dams

China Mill Dam

Merrimack, NH

High Hazard 29 ft

Webster

Merrimack, NH

Significant Hazard 22 ft

Hooksett

Merrimack, NH

Low Hazard 11 ft

Campus Drive Dam

Merrimack, NH

Significant Hazard 26 ft

Garvins Falls

Merrimack, NH

Low Hazard 18 ft

Catamount Pond Dam

Merrimack, NH

Low Hazard 14 ft

Hayes Marsh Dam

Merrimack, NH

Low Hazard 10 ft

Dube Pond Dam

Merrimack, NH

Significant Hazard 8 ft

Frequently Asked Questions

What is the hazard classification of Pembroke?

Pembroke 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 Pembroke?

Pembroke is owned by Pembroke Hydro Associates (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Pembroke built?

Pembroke was completed in 1891, making it 135 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 Pembroke?

Pembroke 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 Pembroke?

Pembroke has a dam height of 26 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 Pembroke last inspected?

Pembroke was last inspected on May 25, 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.