Cascade Brook Dam Reservoir Report
Nearby: Chase Pond Dam Tannery Pond Dam
Last Updated: December 19, 2025
Cascade Brook Dam, located in Sutton, New Hampshire, is a concrete structure completed in 1955 with a primary purpose of recreation.
°F
°F
mph
Wind
%
Humidity
Summary
The dam stands at 11 feet high and spans 130 feet in length, providing storage for up to 109 acre-feet of water from Cascade Brook. With a surface area of 2.5 acres and a drainage area of 7.9 square miles, the dam has a low hazard potential and is currently assessed to be in fair condition.
Managed by the New Hampshire Department of Environmental Services Dam Bureau, Cascade Brook Dam undergoes state regulation, inspection, and enforcement to ensure its safety and compliance. The dam features an uncontrolled spillway and has a maximum discharge capacity of 3,230 cubic feet per second. Despite its moderate risk assessment rating, the dam's risk management measures and emergency action plan status are currently unlisted, though its last inspection was conducted in March 2020 with a frequency of every 6 years. For enthusiasts of water resources and climate, Cascade Brook Dam offers a fascinating glimpse into the intersection of human engineering and natural landscapes in the Granite State.
Year Completed |
1955 |
Dam Length |
130 |
Dam Height |
11 |
River Or Stream |
CASCADE BROOK |
Primary Dam Type |
Concrete |
Surface Area |
2.5 |
Drainage Area |
7.9 |
Nid Storage |
109 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
11 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Cascade Brook Dam
Pleasant Lake boat launch