Cass Pond Dam

LITTLE SUNCOOK RIVER· Merrimack, New Hampshire· Earth· 10 ft tall
Low Hazard Recreation State Government

Key Takeaway

Cass Pond Dam is classified as low hazard in New Hampshire. Its primary use is recreation.

Physical Details

Dam Height 10 ft (taller than 16% in NH)
Dam Length140 ft
Dam TypeEarth
Max Storage83 acre-ft
Normal Storage34 acre-ft
Surface Area15 acres
Drainage Area31 sq mi
Max Discharge1,961 cfs
Year Modified1967
NID IDNH00578

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 18, 2018
State Regulated: Yes
Regulatory Agency: NH DES

Ownership

NH DES WATER DIVISION

State Government

Nearby Dams

Northwood Lake Dam

Merrimack, NH

High Hazard 13 ft

Huckins Mill Dam

Merrimack, NH

Unknown 13 ft

Pleasant Lake Dam

Rockingham, NH

Low Hazard 7 ft

Deer Meadow Pond Dam

Merrimack, NH

Low Hazard 15 ft

Berry Pond Dam

Merrimack, NH

High Hazard 18 ft

Pittsfield Sewage Lagoon Dam

Merrimack, NH

Significant Hazard 18 ft

Gulch Mountain Pond Dam

Rockingham, NH

Significant Hazard 15 ft

Whites Pond Dam and Dike

Merrimack, NH

High Hazard 15 ft

Frequently Asked Questions

What is the hazard classification of Cass Pond Dam?

Cass Pond 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 Cass Pond Dam?

Cass Pond Dam is owned by NH DES WATER DIVISION (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

What is the primary purpose of Cass Pond Dam?

Cass Pond 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 Cass Pond Dam?

Cass Pond Dam has a dam height of 10 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 Cass Pond Dam last inspected?

Cass Pond Dam was last inspected on May 18, 2018. 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.