Green Lake
Green Lake is an arch dam located in City and Borough of Sitka, Alaska, built in 1982. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Green Lake
The primary purpose of Green Lake 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 City And Borough Of Sitka (local government). It impounds the Vodopad River.
The dam stands 210 feet tall and stretches 462 feet across, creates a reservoir covering 1,120 acres, has a storage capacity of 94,000 acre-feet, and collects water from a drainage area of 28 square miles. Completed in 1982, the structure is 44 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 06/04/2025.
At 210 feet, this dam is taller than 99% of all dams in the United States.
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Location
| State | Alaska |
| County | City and Borough of Sitka |
| Nearest City | None |
| River/Stream | Vodopad River |
| Coordinates | 56.98686, -135.11362 |
Physical Characteristics
| Dam Type | Arch |
| NID Height | 210 ft |
| Dam Height | 210 ft |
| Dam Length | 462 ft |
| Year Completed | 1982 (44 years old) |
Storage & Hydraulics
| NID Storage | 94,000 acre-ft |
| Normal Storage | 94,000 acre-ft |
| Surface Area | 1,120 acres |
| Drainage Area | 28 sq mi |
| Max Discharge | 12,800 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | City and Borough of Sitka |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/04/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | AK83012 |
| Federal ID | AK83012 |
| More Info | State Dam Safety Program |