Onway Lake Dam is a concrete dam located in Rockingham County, New Hampshire, built in 1915. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 9 ft9 ft tall and 65 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Onway Lake Dam
The primary purpose of Onway Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by J and D Realty Trust (private). It impounds the Tr Lamprey River near Raymond.
The dam stands 9 feet tall and stretches 65 feet across, creates a reservoir covering 194 acres, has a maximum storage capacity of 2,600 acre-feet, and collects water from a drainage area of 8 square miles. Completed in 1915, the structure is over a century old.
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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 11/15/2018.
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Location
| State | New Hampshire |
| County | Rockingham |
| Nearest City | Raymond |
| River/Stream | Tr Lamprey River |
| Coordinates | 43.03440, -71.21580 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 9 ft |
| Dam Height | 9 ft |
| Dam Length | 65 ft |
| Year Completed | 1915 (111 years old) |
Storage & Hydraulics
| NID Storage | 2,600 acre-ft |
| Max Storage | 2,600 acre-ft |
| Normal Storage | 2,100 acre-ft |
| Surface Area | 194 acres |
| Drainage Area | 8 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | J and D Realty Trust |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 11/15/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH00438 |
| Federal ID | NH00438 |
| More Info | State Dam Safety Program |