Seaway Center Stormwater Detention Dam is an earth dam located in Snohomish County, Washington, built in 1989. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 39 ft39 ft tall, taller than 85% of U.S. dams with a recorded height. 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 Seaway Center Stormwater Detention Dam
The primary purpose of Seaway Center Stormwater Detention 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 Everett City Public Works (local government). It impounds the Tr-powder Mill Gulch near Mukilteo.
The dam stands 39 feet tall, creates a reservoir covering 14 acres, has a maximum storage capacity of 27 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1989, the structure is 37 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. 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 06/30/2016. That was over 10 years ago.
At 39 feet, this dam is taller than 85% of dams nationwide.
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Location
| State | Washington |
| County | Snohomish |
| Nearest City | Mukilteo |
| River/Stream | Tr-powder Mill Gulch |
| Coordinates | 47.94374, -122.26608 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 39 ft |
| Year Completed | 1989 (37 years old) |
Storage & Hydraulics
| NID Storage | 27 acre-ft |
| Max Storage | 27 acre-ft |
| Normal Storage | 16 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 90 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Everett City Public Works |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/30/2016 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA01664 |
| Federal ID | WA01664 |
| More Info | State Dam Safety Program |