Lakeport is a concrete dam located in Belknap County, New Hampshire, built in 1958. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 10 ft10 ft tall and 225 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 Lakeport
The primary purpose of Lakeport is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is state-owned. It impounds the Winnipesaukee River near Laconia.
The dam stands 10 feet tall and stretches 225 feet across, creates a reservoir covering 46,720 acres, has a maximum storage capacity of 165,800 acre-feet, and collects water from a drainage area of 363 square miles. Completed in 1958, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in 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 09/13/2022.
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Location
| State | New Hampshire |
| County | Belknap |
| Nearest City | Laconia |
| River/Stream | Winnipesaukee River |
| Coordinates | 43.54830, -71.46540 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 225 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 165,800 acre-ft |
| Max Storage | 165,800 acre-ft |
| Normal Storage | 165,800 acre-ft |
| Surface Area | 46,720 acres |
| Drainage Area | 363 sq mi |
| Max Discharge | 4,080 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/13/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00216 |
| Federal ID | NH00216 |
| More Info | State Dam Safety Program |