Twin Lake
Twin Lake is an earth dam located in Alpine County, California, built in 1903. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Twin Lake
The primary purpose of Twin 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 Pacific Gas And Electric Company (private). It impounds the North Fork Mokelumne River-tr near Kirkwood.
The dam stands 22 feet tall and stretches 1,520 feet across, creates a reservoir covering 600 acres, has a maximum storage capacity of 21,581 acre-feet, and collects water from a drainage area of 13 square miles. Completed in 1903, the structure is over a century 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 09/07/2022.
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Location
| State | California |
| County | Alpine |
| Nearest City | Kirkwood |
| River/Stream | North Fork Mokelumne River-tr |
| Coordinates | 38.60890, -119.94452 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 1,520 ft |
| Year Completed | 1903 (123 years old) |
Storage & Hydraulics
| NID Storage | 21,581 acre-ft |
| Max Storage | 21,581 acre-ft |
| Normal Storage | 1,210 acre-ft |
| Surface Area | 600 acres |
| Drainage Area | 13 sq mi |
| Max Discharge | 12,400 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Pacific Gas and Electric Company |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/07/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CA00384 |
| Federal ID | CA00384 |
| More Info | State Dam Safety Program |