Cohas Road Res Low Service Dam Reservoir Report
Last Updated: December 16, 2025
Cohas Road Res Low Service Dam, located in Manchester, New Hampshire, serves as a crucial water supply structure owned by the local government.
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Summary
With a design dating back to 1874, this earth dam stands at a height of 20 feet and boasts a storage capacity of 61.4 acre-feet. Despite being classified as having a high hazard potential, the dam is currently in satisfactory condition, as assessed in August 2017.
Managed by the NHDES Dam Bureau, this dam is regularly inspected, with the last assessment conducted in October 2020. While it may pose a moderate risk due to its age and design, the dam has been deemed to meet guidelines for emergency action plans. With a primary purpose of water supply, Cohas Road Res Low Service Dam plays a vital role in supporting the local community's water needs. Its location in Hillsborough County underscores its significance in ensuring water security for the region.
As a water resource and climate enthusiast, the Cohas Road Res Low Service Dam presents a fascinating case study in the maintenance and management of critical infrastructure. With its historical significance and ongoing regulatory oversight, this dam exemplifies the intersection of engineering, environmental stewardship, and public safety. As efforts continue to uphold its structural integrity and safety standards, this dam remains a symbol of resilience in the face of evolving water resource challenges.
Year Completed |
1874 |
Dam Length |
1000 |
Dam Height |
20 |
River Or Stream |
NA |
Primary Dam Type |
Earth |
Surface Area |
3 |
Nid Storage |
61.4 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
20 |
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.
Cohas Road Res Low Service Dam
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