Three Mile Creek Reservoir is an earth dam located in Harney County, Oregon, built in 1946. It carries a Low hazard potential classification.
Dam profile
NID height · 14 ft14 ft tall and 8,000 ft long. 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 Three Mile Creek Reservoir
The primary purpose of Three Mile Creek Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Roaring Springs Ranch, Inc (private). It impounds the Three Mile Creek near No Downstream Settlement.
The dam stands 14 feet tall and stretches 8,000 feet across, creates a reservoir covering 34 acres, has a maximum storage capacity of 1,600 acre-feet, and collects water from a drainage area of 50 square miles. Completed in 1946, 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 06/06/2017.
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Location
| State | Oregon |
| County | Harney |
| Nearest City | No Downstream Settlement |
| River/Stream | Three Mile Creek |
| Coordinates | 42.48714, -118.90757 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 12 ft |
| Dam Length | 8,000 ft |
| Year Completed | 1946 (80 years old) |
Storage & Hydraulics
| NID Storage | 1,600 acre-ft |
| Max Storage | 1,600 acre-ft |
| Normal Storage | 1,600 acre-ft |
| Surface Area | 34 acres |
| Drainage Area | 50 sq mi |
| Max Discharge | 420 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Roaring Springs Ranch, Inc |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 06/06/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00158 |
| Federal ID | OR00158 |
| More Info | State Dam Safety Program |