Pit No. 1 Diversion is a concrete dam located in Shasta County, California, built in 1922. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 18 ft18 ft tall and 600 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Pit No. 1 Diversion
The primary purpose of Pit No. 1 Diversion 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 Fall River near Fall River Mills.
The dam stands 18 feet tall and stretches 600 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 50 acre-feet, and collects water from a drainage area of 600 square miles. Completed in 1922, 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 09/20/2022.
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Location
| State | California |
| County | Shasta |
| Nearest City | Fall River Mills |
| River/Stream | Fall River |
| Coordinates | 41.01340, -121.46450 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 600 ft |
| Year Completed | 1922 (104 years old) |
Storage & Hydraulics
| NID Storage | 50 acre-ft |
| Max Storage | 50 acre-ft |
| Normal Storage | 50 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 600 sq mi |
| Max Discharge | 300 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Pacific Gas and Electric Company |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/20/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CA00396 |
| Federal ID | CA00396 |
| More Info | State Dam Safety Program |