Riley Horn Dam is a gravity dam located in Malheur County, Oregon, built in 1961. It carries a Low hazard potential classification.
Dam profile
NID height · 12 ft12 ft tall and 610 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Riley Horn Dam
The primary purpose of Riley Horn Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Doi BLM (federal). It impounds the Fort Creek.
The dam stands 12 feet tall and stretches 610 feet across, creates a reservoir covering 65 acres, and has a maximum storage capacity of 385 acre-feet. Completed in 1961, 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. The most recent inspection on record was 09/19/2018.
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Location
| State | Oregon |
| County | Malheur |
| River/Stream | Fort Creek |
| Coordinates | 43.16835, -117.57534 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 12 ft |
| Dam Length | 610 ft |
| Year Completed | 1961 (65 years old) |
Storage & Hydraulics
| NID Storage | 385 acre-ft |
| Max Storage | 385 acre-ft |
| Normal Storage | 164 acre-ft |
| Surface Area | 65 acres |
| Max Discharge | 286 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Doi BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 09/19/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00760 |
| Federal ID | OR00760 |
| More Info | State Dam Safety Program |