Miller Creek Regional Detention Facility Reservoir Report
Last Updated: December 15, 2025
Miller Creek Regional Detention Facility, also known as Reba Lake Stormwater Detention Dam, is a vital infrastructure owned by the local government in King, Washington.
°F
°F
mph
Wind
%
Humidity
Summary
Situated within Sea-Tac City Limits, this facility plays a crucial role in flood risk reduction along Miller Creek. Completed in 1992, this gravity dam stands at a hydraulic height of 16.5 feet and a structural height of 13.6 feet, with a storage capacity of 119 acre-feet and a normal storage level of 73.3 acre-feet.
With a satisfactory condition assessment as of May 2019, Miller Creek Regional Detention Facility has a significant hazard potential but meets regulatory standards set by the Washington Dept of Ecology. The dam's purpose is solely focused on flood risk reduction, serving as a key component in safeguarding the surrounding area from potential inundation. Despite its age, this structure continues to operate effectively, with inspections conducted every five years to ensure its integrity and functionality.
Located in a critical watershed area with a drainage area of 3.21 square miles, Miller Creek Regional Detention Facility is a vital asset in the region's water resource management strategy. As climate change leads to more extreme weather events, the importance of such facilities in mitigating flood risks and protecting communities becomes increasingly evident. The dedication to regular inspections and maintenance underscores the commitment to ensuring the safety and resilience of this essential infrastructure in the face of evolving environmental challenges.
Year Completed |
1992 |
Dam Length |
370 |
River Or Stream |
Miller Creek |
Primary Dam Type |
Gravity |
Surface Area |
1 |
Hydraulic Height |
16.5 |
Drainage Area |
3.21 |
Nid Storage |
119 |
Structural Height |
13.6 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
17 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Point Robinson Campground
|
||
Dash Point State Park
|
||
Dash Point Campground
|
Miller Creek Regional Detention Facility
47th Avenue Southwest 10203, Seattle