Eastman Lake Dam Reservoir Report
Last Updated: December 14, 2025
Eastman Lake Dam, also known as Site C-2, is a privately owned structure located in Grantham, New Hampshire.
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Summary
Built in 1972 by the USDA NRCS, this earth dam stands at a height of 35 feet and stretches 415 feet in length. Its primary purpose is for recreation, offering a serene environment for water resource and climate enthusiasts to enjoy.
Managed by the NHDES DAM BUREAU, Eastman Lake Dam has a high hazard potential but is currently rated as satisfactory in condition. With a normal storage capacity of 2100 acre-feet and a maximum discharge of 4300 cubic feet per second, this dam plays a crucial role in regulating the flow of Eastman Brook. Despite its high hazard potential, the risk assessment for Eastman Lake Dam is moderate, showing that proper risk management measures are in place to ensure public safety.
Visitors to Eastman Lake Dam can appreciate its important role in water resource management while engaging in recreational activities in the tranquil surroundings. With its scenic location and essential function, this dam serves as a focal point for environmental enthusiasts interested in the intersection of water resources and climate impacts.
Year Completed |
1972 |
Dam Length |
415 |
Dam Height |
35 |
River Or Stream |
EASTMAN BROOK |
Primary Dam Type |
Earth |
Surface Area |
335 |
Drainage Area |
7.5 |
Nid Storage |
9930 |
Outlet Gates |
None |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
35 |
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.
Eastman Lake Dam
McDaniels Marsh boat launch