Crotched Mtn Storage Lagoon Dam Reservoir Report
Last Updated: December 19, 2025
The Crotched Mtn Storage Lagoon Dam, located in Francestown, New Hampshire, is a privately owned earth dam completed in 1989 with a height of 15 feet and a length of 2200 feet.
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Summary
The dam serves a primary purpose of "Other" and has a normal storage capacity of 19.8 acre-feet. Despite its small size, the dam is considered to have a significant hazard potential and is subject to regular inspections by the NHDES DAM BUREAU to ensure its structural integrity.
With a satisfactory condition assessment as of May 2015, the Crotched Mtn Storage Lagoon Dam is deemed to be in good shape. However, its high risk assessment rating of 2 indicates a need for careful monitoring and risk management measures to prevent potential incidents. Although the dam does not have a spillway or outlet gates, its location in the Hillsborough County of New Hampshire highlights the importance of maintaining its integrity to protect surrounding areas from any potential flooding or water release.
Despite its relatively low profile, the Crotched Mtn Storage Lagoon Dam plays a crucial role in water resource management in the region. Enthusiasts of water resources and climate will find this dam to be an intriguing example of the intersection between human infrastructure and environmental stewardship in ensuring the safety and sustainability of water resources in New Hampshire.
Year Completed |
1989 |
Dam Length |
2200 |
Dam Height |
15 |
River Or Stream |
NA |
Primary Dam Type |
Earth |
Surface Area |
2.2 |
Nid Storage |
20 |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
15 |
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.
Crotched Mtn Storage Lagoon Dam
Ferrin Pond boat launch