Wendall Marsh Dam

SUGAR RIVER· Sullivan, New Hampshire· Concrete· 15 ft tall
Significant Hazard Recreation State Government

Key Takeaway

Wendall Marsh Dam is classified as significant hazard in New Hampshire. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.

Physical Details

Dam Height 15 ft (taller than 47.8% in NH)
Dam Length74 ft
Dam TypeConcrete
Max Storage365 acre-ft
Normal Storage104 acre-ft
Surface Area30 acres
Drainage Area50 sq mi
Max Discharge3,130 cfs
Year Modified2015
NID IDNH00603

Safety Information

Significant Hazard

No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.

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

Emergency Action Plan: Yes
Last Inspection: March 31, 2020
State Regulated: Yes
Regulatory Agency: NH DES

Ownership

NH FISH AND GAME DEPARTMENT

State Government

Nearby Dams

Sunapee

Sullivan, NH

Significant Hazard 15 ft

Sunapee Lake Dam

Sullivan, NH

Significant Hazard 14 ft

Dorr Woolen Sewage Lagoon Dam

Sullivan, NH

Significant Hazard 20 ft

Loon Lake Dam

Sullivan, NH

High Hazard 15 ft

Mount Sunapee Sewage Lagoon Dam

Merrimack, NH

Significant Hazard 22 ft

Sugar River Ii

Sullivan, NH

Significant Hazard 10 ft

Wildlife Pond Dam

Sullivan, NH

Unknown 16 ft

Sugar River I

Sullivan, NH

Significant Hazard 18 ft

Frequently Asked Questions

What is the hazard classification of Wendall Marsh Dam?

Wendall Marsh Dam is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates Wendall Marsh Dam?

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

What is the primary purpose of Wendall Marsh Dam?

Wendall Marsh 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 Wendall Marsh Dam?

Wendall Marsh Dam has a dam height of 15 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 Wendall Marsh Dam last inspected?

Wendall Marsh 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.