Upper Rock Lake Auxiliary 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.
Dam profile
NID height · 9 ft9 ft tall and 90 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Upper Rock Lake Auxiliary
The primary purpose of Upper Rock Lake Auxiliary 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 9 feet tall and stretches 90 feet across, creates a reservoir covering 0 acres, has a maximum storage capacity of 190 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 08/10/2016. That was over 10 years ago.
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Location
| State | California |
| County | Nevada |
| Nearest City | None |
| River/Stream | Texas Creek |
| Coordinates | 39.43000, -120.61810 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 9 ft |
| Dam Height | 8 ft |
| Dam Length | 90 ft |
| Year Completed | 1855 (171 years old) |
Storage & Hydraulics
| NID Storage | 190 acre-ft |
| Max Storage | 190 acre-ft |
| Normal Storage | 190 acre-ft |
| Surface Area | 0 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 0 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 | 08/10/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CA00372 |
| Federal ID | CA00372S001 |
| More Info | State Dam Safety Program |