Cohas Avenue Dam
Cohas Avenue Dam is an earth dam located in Hillsborough, New Hampshire, built in 1874. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Cohas Avenue Dam
The primary purpose of Cohas Avenue Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Manchester Water Works (local government). It impounds the Na near Manchester.
The dam stands 20 feet tall and stretches 1,000 feet across, creates a reservoir covering 3 acres, and has a maximum storage capacity of 61 acre-feet. Completed in 1874, the structure is one of the older dams in the region, with over a century and a half of service.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 10/08/2020.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | New Hampshire |
| County | Hillsborough |
| Nearest City | Manchester |
| River/Stream | Na |
| Coordinates | 42.97050, -71.42380 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 1,000 ft |
| Year Completed | 1874 (152 years old) |
Storage & Hydraulics
| NID Storage | 61 acre-ft |
| Max Storage | 61 acre-ft |
| Normal Storage | 49 acre-ft |
| Surface Area | 3 acres |
Ownership & Safety
| Purpose | Water Supply |
| Owner | MANCHESTER WATER WORKS |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/08/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00771 |
| Federal ID | NH00771 |
| More Info | State Dam Safety Program |