Waterloom Falls Reservoir Report
Last Updated: December 16, 2025
Waterloom Falls, also known as Waterloom Pond Dam, is a privately owned concrete gravity dam located in Greenville, New Hampshire.
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Summary
Built in 1980 for hydroelectric purposes, this dam stands at 18 feet tall and stretches 205 feet in length, with a storage capacity of 663 acre-feet. The Souhegan River is the primary water source regulated by the New Hampshire Department of Environmental Services Dam Bureau, ensuring proper inspection, enforcement, and permitting to maintain safety and compliance standards.
Managed by the Federal Energy Regulatory Commission, Waterloom Falls has a low hazard potential and a moderate risk assessment rating. The dam features an uncontrolled spillway with a width of 75 feet and one slide gate for water release. In case of emergencies, an Emergency Action Plan was last revised in 2005, with updated contact information and guidelines. With a drainage area of 23.1 square miles and a maximum discharge of 1270 cubic feet per second, Waterloom Falls remains a key structure in the region's water resource management system, providing both energy generation and environmental protection.
Year Completed |
1980 |
Dam Length |
205 |
Dam Height |
18 |
River Or Stream |
Souhegan River |
Primary Dam Type |
Concrete |
Surface Area |
75 |
Drainage Area |
23.1 |
Nid Storage |
663 |
Outlet Gates |
Slide (sluice gate) - 1 |
Hazard Potential |
Low |
Nid Height |
18 |
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.
Waterloom Falls
Cunningham Pond boat launch