Cascade Brook Dam

CASCADE BROOK· Merrimack, New Hampshire· Built 1955· Concrete· 11 ft tall
Low Hazard Recreation State Government

Key Takeaway

Cascade Brook Dam is classified as low hazard in New Hampshire. It was completed in 1955 and is 71 years old. Its primary use is recreation.

Physical Details

Dam Height 11 ft (taller than 23.8% in NH)
Dam Length130 ft
Dam TypeConcrete
Max Storage394 acre-ft
Normal Storage26 acre-ft
Surface Area6 acres
Drainage Area8 sq mi
Year Completed1955 (71 years old)
NID IDNH00082

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: March 31, 2020
State Regulated: Yes
Regulatory Agency: NH DES

Ownership

NH FISH AND GAME DEPARTMENT

State Government

Nearby Dams

Chase Pond Dam

Merrimack, NH

Significant Hazard 17 ft

Tannery Pond Dam

Merrimack, NH

Low Hazard 12 ft

Pleasant Lake Dam

Merrimack, NH

High Hazard 13 ft

Chadwick Meadows Wildlife Ref Dam

Merrimack, NH

Significant Hazard 47 ft

Morey Pond Dam

Merrimack, NH

Low Hazard 12 ft

Cole Pond Dam

Merrimack, NH

Low Hazard 10 ft

Loch Lyndon Reservoir Dam

Merrimack, NH

Low Hazard 12 ft

Bradley Lake Dam

Merrimack, NH

Significant Hazard 19 ft

Frequently Asked Questions

What is the hazard classification of Cascade Brook Dam?

Cascade Brook 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 Cascade Brook Dam?

Cascade Brook Dam is owned by NH FISH AND GAME DEPARTMENT (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Cascade Brook Dam built?

Cascade Brook Dam was completed in 1955, making it 71 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 Cascade Brook Dam?

Cascade Brook 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 Cascade Brook Dam?

Cascade Brook Dam has a dam height of 11 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 Cascade Brook Dam last inspected?

Cascade Brook Dam was last inspected on March 31, 2020. 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.