Cottonwood (drewsey)
Cottonwood (drewsey) is an other dam located in Harney County, Oregon, built in 1967. It carries a Significant hazard potential classification.
About Cottonwood (drewsey)
The primary purpose of Cottonwood (drewsey) is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Otis Valley Irrigation (local government). It impounds the Cottonwood Creek near Drewsey.
The dam stands 83 feet tall and stretches 335 feet across, creates a reservoir covering 112 acres, has a maximum storage capacity of 4,500 acre-feet, and collects water from a drainage area of 34 square miles. Completed in 1967, 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 11/17/2020.
At 83 feet, this dam is taller than 97% of all dams in the United States.
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Location
| State | Oregon |
| County | Harney |
| Nearest City | Drewsey |
| River/Stream | Cottonwood Creek |
| Coordinates | 43.92759, -118.30075 |
Physical Characteristics
| Dam Type | Other |
| NID Height | 83 ft |
| Dam Height | 73 ft |
| Dam Length | 335 ft |
| Year Completed | 1967 (59 years old) |
Storage & Hydraulics
| NID Storage | 4,500 acre-ft |
| Max Storage | 4,500 acre-ft |
| Normal Storage | 3,700 acre-ft |
| Surface Area | 112 acres |
| Drainage Area | 34 sq mi |
| Max Discharge | 1,450 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | OTIS VALLEY IRRIGATION |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not Rated |
| Last Inspection | 11/17/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00435 |
| Federal ID | OR00435 |
| More Info | State Dam Safety Program |