Petersburg Upper Dam
Petersburg Upper Dam is an other dam located in Petersburg Borough, Alaska, built in 1950. It carries a Significant hazard potential classification and has a fair condition assessment.
About Petersburg Upper Dam
The primary purpose of Petersburg Upper Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City Of Petersburg (local government). It impounds the City Creek near Petersburg.
The dam stands 27 feet tall and stretches 286 feet across, creates a reservoir covering 17 acres, has a maximum storage capacity of 142 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1950, 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 09/17/2019.
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Location
| State | Alaska |
| County | Petersburg Borough |
| Nearest City | Petersburg |
| River/Stream | City Creek |
| Coordinates | 56.78000, -132.91490 |
Physical Characteristics
| Dam Type | Other |
| NID Height | 27 ft |
| Dam Height | 23 ft |
| Dam Length | 286 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 142 acre-ft |
| Max Storage | 142 acre-ft |
| Normal Storage | 123 acre-ft |
| Surface Area | 17 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 2,000 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | CITY OF PETERSBURG |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 09/17/2019 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | AK00016 |
| Federal ID | AK00016 |
| More Info | State Dam Safety Program |