Pit No. 7 Afterbay
Pit No. 7 Afterbay is a rockfill dam located in Shasta County, California, built in 1965. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Pit No. 7 Afterbay
The primary purpose of Pit No. 7 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 Pit River near Redding.
The dam stands 35 feet tall, has a storage capacity of 1 acre-feet, and collects water from a drainage area of 4,897 square miles. Completed in 1965, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in 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 08/01/2023.
At 35 feet, this dam is taller than 82% of dams nationwide.
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Location
| State | California |
| County | Shasta |
| Nearest City | Redding |
| River/Stream | Pit River |
| Coordinates | 40.84180, -122.01700 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 35 ft |
| Dam Height | 25 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 1 acre-ft |
| Normal Storage | 1 acre-ft |
| Drainage Area | 4,897 sq mi |
| Max Discharge | 115,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Pacific Gas and Electric Company |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/01/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA82569 |
| Federal ID | CA82569 |
| More Info | State Dam Safety Program |