Lower Lisbon
Lower Lisbon is a concrete dam located in Grafton County, New Hampshire, built in 1986. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Lower Lisbon
The primary purpose of Lower Lisbon is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by White Mountain Hydroelectric Corporation (private). It impounds the Ammonoosuc River near Bath.
The dam stands 18 feet tall and stretches 292 feet across, creates a reservoir covering 64 acres, has a maximum storage capacity of 96 acre-feet, and collects water from a drainage area of 288 square miles. Completed in 1986, the structure is 40 years 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 05/22/2018.
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Location
| State | New Hampshire |
| County | Grafton |
| Nearest City | Bath |
| River/Stream | Ammonoosuc River |
| Coordinates | 44.21430, -71.91100 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 292 ft |
| Year Completed | 1986 (40 years old) |
Storage & Hydraulics
| NID Storage | 96 acre-ft |
| Max Storage | 96 acre-ft |
| Normal Storage | 96 acre-ft |
| Surface Area | 64 acres |
| Drainage Area | 288 sq mi |
| Max Discharge | 1,200 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | White Mountain Hydroelectric Corporation |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/22/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH00144 |
| Federal ID | NH00144 |
| More Info | State Dam Safety Program |