Rock House Reservoir (malheur) is an earth dam located in Malheur County, Oregon, built in 1956. It carries a Low hazard potential classification.
Dam profile
NID height · 22 ft22 ft tall and 963 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 Rock House Reservoir (malheur)
The primary purpose of Rock House Reservoir (malheur) is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Willard L. Smith (private). It impounds the Dry Creek near Nyssa.
The dam stands 22 feet tall and stretches 963 feet across, creates a reservoir covering 49 acres, has a maximum storage capacity of 391 acre-feet, and collects water from a drainage area of 175 square miles. Completed in 1956, 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 12/20/2019.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Oregon |
| County | Malheur |
| Nearest City | Nyssa |
| River/Stream | Dry Creek |
| Coordinates | 42.70528, -117.57307 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 963 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 391 acre-ft |
| Max Storage | 391 acre-ft |
| Normal Storage | 391 acre-ft |
| Surface Area | 49 acres |
| Drainage Area | 175 sq mi |
| Max Discharge | 930 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Willard L. Smith |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 12/20/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00254 |
| Federal ID | OR00254 |
| More Info | State Dam Safety Program |