Middle Fork Interbay
Middle Fork Interbay is a concrete dam located in Placer County, California, built in 1966. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Middle Fork Interbay
The primary purpose of Middle Fork Interbay is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Placer County Water Agency (local government). It impounds the Middle Fork American River near Auburn.
The dam stands 71 feet tall and stretches 233 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 155 acre-feet, and collects water from a drainage area of 33 square miles. Completed in 1966, the structure is well into its service life at over 50 years 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 06/22/2022.
At 71 feet, this dam is taller than 96% of all dams in the United States.
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Location
| State | California |
| County | Placer |
| Nearest City | Auburn |
| River/Stream | Middle Fork American River |
| Coordinates | 39.02640, -120.60320 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 71 ft |
| Dam Height | 70 ft |
| Dam Length | 233 ft |
| Year Completed | 1966 (60 years old) |
Storage & Hydraulics
| NID Storage | 155 acre-ft |
| Max Storage | 155 acre-ft |
| Normal Storage | 155 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 33 sq mi |
| Max Discharge | 37,400 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Placer County Water Agency |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/22/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CA00858 |
| Federal ID | CA00858 |
| More Info | State Dam Safety Program |