Upper Mountain Lake Dam
New Hampshire — Grafton County — WATERMAN BROOK
Location
| State | New Hampshire |
| County | Grafton |
| River | WATERMAN BROOK |
| Coordinates | 44.12013, -71.95709 |
Physical Characteristics
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 660 ft |
| NID Storage | 499 acre-ft |
| Max Storage | 499 acre-ft |
| Surface Area | 27 acres |
Safety Classification
| Hazard Potential | Low |
| Condition Assessment | Fair |
| EAP Status | Not Required |
| Last Inspection | April 18, 2021 |
| Inspection Frequency | 6 |
Dam Information
| Year Completed | 1963 |
| Primary Purpose | Recreation |
| Dam Type | Earth |
| Owner Type | Local Government |
| Owner | MOUNTAIN LAKES VILLAGE DISTRICT |
| Other Name | Olsen Dam |
Location Map
About This Dam Record
Dam safety data is maintained by the Army Corps of Engineers National Inventory of Dams (NID). High-hazard dams are those where failure could cause loss of life or major property damage downstream.