Rock Creek is a dam located in Owyhee County, Idaho, built in 1965. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 37 ft37 ft tall and 475 ft long, taller than 83% 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 Rock Creek
The primary purpose of Rock Creek is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is private-owned. It impounds the Rock Creek North Boulder Creek near Triangle Road.
The dam stands 37 feet tall and stretches 475 feet across, creates a reservoir covering 74 acres, has a storage capacity of 1,184 acre-feet, and collects water from a drainage area of 54 square miles. Completed in 1965, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 06/05/2019.
At 37 feet, this dam is taller than 83% of dams nationwide.
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Location
| State | Idaho |
| County | Owyhee |
| Nearest City | Triangle Road |
| River/Stream | Rock Creek North Boulder Creek |
| Coordinates | 42.78140, -116.61280 |
Physical Characteristics
| NID Height | 37 ft |
| Dam Height | 37 ft |
| Dam Length | 475 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 1,184 acre-ft |
| Normal Storage | 1,184 acre-ft |
| Surface Area | 74 acres |
| Drainage Area | 54 sq mi |
| Max Discharge | 2,050 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Irrigation |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 06/05/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ID00237 |
| Federal ID | ID00237 |
| More Info | State Dam Safety Program |