Cow Lake Dam is a gravity dam located in Adams County, Washington, built in 1935. It carries a Low hazard potential classification.
Dam profile
NID height · 7 ft7 ft tall and 600 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Cow Lake Dam
The primary purpose of Cow Lake Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Johnharder (private). It impounds the Cow Creek.
The dam stands 7 feet tall and stretches 600 feet across, creates a reservoir covering 240 acres, has a maximum storage capacity of 900 acre-feet, and collects water from a drainage area of 315 square miles. Completed in 1935, the structure is well-established, with more than 75 years of service.
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.
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Location
| State | Washington |
| County | Adams |
| River/Stream | Cow Creek |
| Coordinates | 47.12854, -118.17554 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 7 ft |
| Dam Length | 600 ft |
| Year Completed | 1935 (91 years old) |
Storage & Hydraulics
| NID Storage | 900 acre-ft |
| Max Storage | 900 acre-ft |
| Normal Storage | 500 acre-ft |
| Surface Area | 240 acres |
| Drainage Area | 315 sq mi |
| Max Discharge | 95 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Johnharder |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA01267 |
| Federal ID | WA01267 |
| More Info | State Dam Safety Program |