Williams-sherman Reservoir is an earth dam located in Harney County, Oregon, built in 1919. It carries a Low hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall and 600 ft long, taller than 50% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Williams-sherman Reservoir
The primary purpose of Williams-sherman Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Grindstone Livestock (gi Ranch Corp.) (private). It impounds the North Fork 12 Mile Creek near Post.
The dam stands 25 feet tall and stretches 600 feet across, creates a reservoir covering 22 acres, has a maximum storage capacity of 300 acre-feet, and collects water from a drainage area of 9 square miles. Completed in 1919, 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. The most recent inspection on record was 10/10/2019.
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Location
| State | Oregon |
| County | Harney |
| Nearest City | Post |
| River/Stream | North Fork 12 Mile Creek |
| Coordinates | 43.94227, -119.73919 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 600 ft |
| Year Completed | 1919 (107 years old) |
Storage & Hydraulics
| NID Storage | 300 acre-ft |
| Max Storage | 300 acre-ft |
| Normal Storage | 300 acre-ft |
| Surface Area | 22 acres |
| Drainage Area | 9 sq mi |
| Max Discharge | 665 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Grindstone Livestock (gi Ranch Corp.) |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/10/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00066 |
| Federal ID | OR00066 |
| More Info | State Dam Safety Program |