Chickahominy Reservoir
Chickahominy Reservoir is an earth dam located in Harney County, Oregon, built in 1951. It carries a Significant hazard potential classification.
About Chickahominy Reservoir
The primary purpose of Chickahominy Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Oregon Department Of Fish And Wildlife (state). It impounds the Chickahominy Creek near Riley.
The dam stands 38 feet tall and stretches 300 feet across, creates a reservoir covering 529 acres, has a maximum storage capacity of 9,000 acre-feet, and collects water from a drainage area of 28 square miles. Completed in 1951, 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. The most recent inspection on record was 10/29/2020.
At 38 feet, this dam is taller than 85% of dams nationwide.
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Location
| State | Oregon |
| County | Harney |
| Nearest City | Riley |
| River/Stream | Chickahominy Creek |
| Coordinates | 43.54448, -119.61350 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 38 ft |
| Dam Height | 36 ft |
| Dam Length | 300 ft |
| Year Completed | 1951 (75 years old) |
Storage & Hydraulics
| NID Storage | 9,000 acre-ft |
| Max Storage | 9,000 acre-ft |
| Normal Storage | 7,228 acre-ft |
| Surface Area | 529 acres |
| Drainage Area | 28 sq mi |
| Max Discharge | 2,862 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | OREGON DEPARTMENT OF FISH AND WILDLIFE |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Not Rated |
| Last Inspection | 10/29/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00228 |
| Federal ID | OR00228 |
| More Info | State Dam Safety Program |