Miller Creek Regional Detention Facility
Miller Creek Regional Detention Facility is a concrete dam located in King County, Washington, built in 1992. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Miller Creek Regional Detention Facility
The primary purpose of Miller Creek Regional Detention Facility 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 Port Of Seattle (local government). It impounds the Miller Creek near Within Sea-tac City Limits.
The dam stands 16 feet tall and stretches 370 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 111 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1992, the structure is 34 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 07/18/2024.
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Location
| State | Washington |
| County | King |
| Nearest City | Within Sea-tac City Limits |
| River/Stream | Miller Creek |
| Coordinates | 47.46758, -122.31794 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 16 ft |
| Dam Length | 370 ft |
| Year Completed | 1992 (34 years old) |
Storage & Hydraulics
| NID Storage | 111 acre-ft |
| Max Storage | 111 acre-ft |
| Normal Storage | 73 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 834 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Port of Seattle |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/18/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA00618 |
| Federal ID | WA00618 |
| More Info | State Dam Safety Program |