Long Lake Dam
Long Lake Dam is a concrete dam located in City and Borough of Juneau, Alaska, built in 1973. It carries a Low hazard potential classification and has a fair condition assessment.
About Long Lake Dam
The primary purpose of Long Lake Dam 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 Alaska Industrial Development And Export Authority (public utility). It impounds the Long River near Juneau.
The dam stands 30 feet tall and stretches 337 feet across, creates a reservoir covering 1,375 acres, has a maximum storage capacity of 147,000 acre-feet, and collects water from a drainage area of 32 square miles. Completed in 1973, the structure is well into its service life at over 50 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 08/28/2019.
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Location
| State | Alaska |
| County | City and Borough of Juneau |
| Nearest City | Juneau |
| River/Stream | Long River |
| Coordinates | 58.16667, -133.73330 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 30 ft |
| Dam Length | 337 ft |
| Year Completed | 1973 (53 years old) |
Storage & Hydraulics
| NID Storage | 147,000 acre-ft |
| Max Storage | 147,000 acre-ft |
| Normal Storage | 147,000 acre-ft |
| Surface Area | 1,375 acres |
| Drainage Area | 32 sq mi |
| Max Discharge | 28,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | ALASKA INDUSTRIAL DEVELOPMENT AND EXPORT AUTHORITY |
| Owner Type | Public Utility |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 08/28/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | AK00044 |
| Federal ID | AK00044 |
| More Info | State Dam Safety Program |