Boeing Flood Control Dam is an earth dam located in Snohomish County, Washington, built in 1967. It carries a High hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 48 ft48 ft tall and 200 ft long, taller than 92% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Boeing Flood Control Dam
The primary purpose of Boeing Flood Control 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 Boeing Company (private). It impounds the Powder Mill Gulch near Darlington.
The dam stands 48 feet tall and stretches 200 feet across, creates a reservoir covering 0 acres, has a maximum storage capacity of 80 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1967, the structure is well into its service life at over 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 07/06/2022.
At 48 feet, this dam is taller than 92% of dams nationwide.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Washington dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Washington |
| County | Snohomish |
| Nearest City | Darlington |
| River/Stream | Powder Mill Gulch |
| Coordinates | 47.93628, -122.27746 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 48 ft |
| Dam Length | 200 ft |
| Year Completed | 1967 (59 years old) |
Storage & Hydraulics
| NID Storage | 80 acre-ft |
| Max Storage | 80 acre-ft |
| Surface Area | 0 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,043 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Boeing Company |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/06/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA00386 |
| Federal ID | WA00386 |
| More Info | State Dam Safety Program |