Mill Creek Storage Dam - Diversion Dam is an earth dam located in Walla Walla County, Washington, built in 1942. It carries a Significant hazard potential classification.
Dam profile
NID height · 14 ft14 ft tall. 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 Mill Creek Storage Dam - Diversion Dam
The primary purpose of Mill Creek Storage Dam - Diversion Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by USACE - Walla Walla District (federal). It impounds the Mill Creek near Walla Walla.
The dam stands 14 feet tall. Completed in 1942, the structure is well-established, with more than 75 years of service.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 04/17/2018.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Washington |
| County | Walla Walla |
| Nearest City | Walla Walla |
| River/Stream | Mill Creek |
| Coordinates | 46.07990, -118.25430 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Year Completed | 1942 (84 years old) |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | USACE - Walla Walla District |
| Owner Type | Federal |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 04/17/2018 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA01376 |
| Federal ID | WA00348S001 |
| More Info | State Dam Safety Program |