Lower Rock Lake
Lower Rock Lake is an earth dam located in Nevada County, California, built in 1855. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Lower Rock Lake
The primary purpose of Lower Rock 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 Texas Creek.
The dam stands 11 feet tall and stretches 110 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 48 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1855, the structure is one of the older dams in the region, with over a century and a half 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 08/12/2019.
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Location
| State | California |
| County | Nevada |
| Nearest City | None |
| River/Stream | Texas Creek |
| Coordinates | 39.42850, -120.62280 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 10 ft |
| Dam Length | 110 ft |
| Year Completed | 1855 (171 years old) |
Storage & Hydraulics
| NID Storage | 50 acre-ft |
| Max Storage | 48 acre-ft |
| Normal Storage | 50 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 33 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 | 08/12/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CA10428 |
| Federal ID | CA10428 |
| More Info | State Dam Safety Program |