Electra Afterbay
Electra Afterbay is a concrete dam located in Calaveras County, California, built in 1948. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Electra Afterbay
The primary purpose of Electra Afterbay 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 near Jackson.
The dam stands 30 feet tall and stretches 319 feet across, creates a reservoir covering 1 acres, and has a maximum storage capacity of 50 acre-feet. Completed in 1948, the structure is well-established, with more than 75 years of service.
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 06/14/2017.
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Location
| State | California |
| County | Calaveras |
| Nearest City | Jackson |
| River/Stream | North Fork Mokelumne River |
| Coordinates | 38.33045, -120.67521 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 319 ft |
| Year Completed | 1948 (78 years old) |
Storage & Hydraulics
| NID Storage | 50 acre-ft |
| Max Storage | 50 acre-ft |
| Normal Storage | 1 acre-ft |
| Surface Area | 1 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Pacific Gas and Electric Company |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/14/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CA10426 |
| Federal ID | CA10426 |
| More Info | State Dam Safety Program |