Cook Reservoir (wash)
Cook Reservoir (wash) is an earth dam located in Washington County, Oregon, built in 1972. It carries a Significant hazard potential classification.
About Cook Reservoir (wash)
The primary purpose of Cook Reservoir (wash) is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Ron Hochstein (private). It impounds the Tualatin River, Trib To near Individual Residences.
The dam stands 28 feet tall and stretches 160 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 14 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1972, 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 11/14/2018.
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Location
| State | Oregon |
| County | Washington |
| Nearest City | Individual Residences |
| River/Stream | Tualatin River, Trib To |
| Coordinates | 45.45536, -123.06646 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 160 ft |
| Year Completed | 1972 (54 years old) |
Storage & Hydraulics
| NID Storage | 14 acre-ft |
| Max Storage | 14 acre-ft |
| Normal Storage | 13 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 72 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | RON HOCHSTEIN |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Rated |
| Last Inspection | 11/14/2018 |
| Emergency Action Plan | No |
Identifiers
| NID ID | OR01430 |
| Federal ID | OR01430 |
| More Info | State Dam Safety Program |