Dutch Flat Afterbay
Dutch Flat Afterbay is a rockfill dam located in Nevada County, California, built in 1965. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Dutch Flat Afterbay
The primary purpose of Dutch Flat Afterbay is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Nevada Irrigation District (public utility). It impounds the Bear River near Two Road Crossings.
The dam stands 165 feet tall and stretches 600 feet across, creates a reservoir covering 42 acres, has a maximum storage capacity of 2,037 acre-feet, and collects water from a drainage area of 23 square miles. Completed in 1965, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 08/22/2022.
At 165 feet, this dam is taller than 99% of all dams in the United States.
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Location
| State | California |
| County | Nevada |
| Nearest City | Two Road Crossings |
| River/Stream | Bear River |
| Coordinates | 39.21350, -120.84480 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 165 ft |
| Dam Height | 165 ft |
| Dam Length | 600 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 2,037 acre-ft |
| Max Storage | 2,037 acre-ft |
| Normal Storage | 1,900 acre-ft |
| Surface Area | 42 acres |
| Drainage Area | 23 sq mi |
| Max Discharge | 15,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Nevada Irrigation District |
| Owner Type | Public Utility |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/22/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA00257 |
| Federal ID | CA00257 |
| More Info | State Dam Safety Program |