Lower Twelvemile (buker Res) is an earth dam located in Crook County, Oregon, built in 1949. It carries a Low hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall and 250 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 Lower Twelvemile (buker Res)
The primary purpose of Lower Twelvemile (buker Res) is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Sheep Mountain Cattle Company (private). It impounds the Twelve Mile Creek near Post.
The dam stands 25 feet tall and stretches 250 feet across, creates a reservoir covering 22 acres, has a maximum storage capacity of 180 acre-feet, and collects water from a drainage area of 10 square miles. Completed in 1949, the structure is well-established, with more than 75 years of service.
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 | Crook |
| Nearest City | Post |
| River/Stream | Twelve Mile Creek |
| Coordinates | 43.94267, -119.78366 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 23 ft |
| Dam Length | 250 ft |
| Year Completed | 1949 (77 years old) |
Storage & Hydraulics
| NID Storage | 180 acre-ft |
| Max Storage | 180 acre-ft |
| Normal Storage | 150 acre-ft |
| Surface Area | 22 acres |
| Drainage Area | 10 sq mi |
| Max Discharge | 403 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Sheep Mountain Cattle Company |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/10/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00162 |
| Federal ID | OR00162 |
| More Info | State Dam Safety Program |