Alpine Auxiliary No. 2
Alpine Auxiliary No. 2 is a rockfill dam located in Alpine County, California. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Alpine Auxiliary No. 2
The primary purpose of Alpine Auxiliary No. 2 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 Northern California Power Agency (private). It impounds the Silver Creek near Dorrington.
The dam stands 21 feet tall and stretches 166 feet across, creates a reservoir covering 172 acres, has a maximum storage capacity of 4,300 acre-feet, and collects water from a drainage area of 5 square miles.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 08/10/2022.
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Location
| State | California |
| County | Alpine |
| Nearest City | Dorrington |
| River/Stream | Silver Creek |
| Coordinates | 38.47220, -120.00520 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 21 ft |
| Dam Height | 21 ft |
| Dam Length | 166 ft |
Storage & Hydraulics
| NID Storage | 4,300 acre-ft |
| Max Storage | 4,300 acre-ft |
| Normal Storage | 4,120 acre-ft |
| Surface Area | 172 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 3,400 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Northern California Power Agency |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/10/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA00422 |
| Federal ID | CA00422S001 |
| More Info | State Dam Safety Program |