Grass Valley
Grass Valley is an earth dam located in Washington County, Utah, built in 1917. It carries a Significant hazard potential classification.
About Grass Valley
The primary purpose of Grass Valley is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by New Castle Reservoir Company (private). It impounds the Grass Valley Crek near Central.
The dam stands 75 feet tall and stretches 450 feet across, has a maximum storage capacity of 13,333 acre-feet, and collects water from a drainage area of 32 square miles. Completed in 1917, the structure is over a century 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. The most recent inspection on record was 07/05/2022.
At 75 feet, this dam is taller than 97% of all dams in the United States.
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Location
| State | Utah |
| County | Washington |
| Nearest City | Central |
| River/Stream | Grass Valley Crek |
| Coordinates | 37.41682, -113.49912 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 75 ft |
| Dam Length | 450 ft |
| Year Completed | 1917 (109 years old) |
Storage & Hydraulics
| NID Storage | 13,333 acre-ft |
| Max Storage | 13,333 acre-ft |
| Normal Storage | 8,432 acre-ft |
| Drainage Area | 32 sq mi |
| Max Discharge | 37 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | NEW CASTLE RESERVOIR COMPANY |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Rated |
| Last Inspection | 07/05/2022 |
| Emergency Action Plan | No |
Identifiers
| NID ID | UT00124 |
| Federal ID | UT00124 |
| More Info | State Dam Safety Program |