Sugar River I
Sugar River I is a concrete dam located in Sullivan County, New Hampshire, built in 1928. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Sugar River I
The primary purpose of Sugar River I is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is private-owned. It impounds the Sugar River near Newport.
The dam stands 18 feet tall and stretches 123 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 50 acre-feet, and collects water from a drainage area of 74 square miles. Completed in 1928, the structure is well-established, with more than 75 years of service.
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 08/26/2022.
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Location
| State | New Hampshire |
| County | Sullivan |
| Nearest City | Newport |
| River/Stream | Sugar River |
| Coordinates | 43.36410, -72.16710 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 123 ft |
| Year Completed | 1928 (98 years old) |
Storage & Hydraulics
| NID Storage | 50 acre-ft |
| Max Storage | 50 acre-ft |
| Normal Storage | 50 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 74 sq mi |
| Max Discharge | 2,300 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/26/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00602 |
| Federal ID | NH00602 |
| More Info | State Dam Safety Program |