South 336th Street Stormwater Dam No 1 Reservoir Report
Last Updated: December 15, 2025
South 336th Street Stormwater Dam No 1, also known as So.
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Summary
336th Rsf, is a crucial structure in Fife, Washington, designed by CH2M HILL to address flood risk reduction along Hylebos Creek. Completed in 1996, this earth dam stands at 12 feet high and 470 feet long, with a storage capacity of 46 acre-feet and a drainage area of 1.14 square miles. Despite its fair condition assessment in 2018, the dam has a high hazard potential, necessitating regular inspections every five years to ensure public safety.
Located in King County and managed by the local government, this dam plays a vital role in protecting the surrounding area from potential flooding events. With a maximum discharge capacity of 430 cubic feet per second, the dam serves as a crucial barrier to prevent water overflow and control the flow of Hylebos Creek. The presence of State regulation and inspection ensures that the dam meets stringent safety standards, providing peace of mind to residents and stakeholders in the region.
As a key flood risk reduction infrastructure in the region, South 336th Street Stormwater Dam No 1 plays a critical role in safeguarding the community from potential water-related disasters. With its strategic location and design features, this dam stands as a testament to effective water resource management and climate resilience efforts in Washington State. Its presence underscores the importance of proactive measures in mitigating flood risks and ensuring the long-term sustainability of water resources in the area.
Year Completed |
1996 |
Dam Length |
470 |
Dam Height |
12 |
River Or Stream |
HYLEBOS CREEK |
Primary Dam Type |
Earth |
Surface Area |
5 |
Hydraulic Height |
12 |
Drainage Area |
1.14 |
Nid Storage |
46 |
Structural Height |
12 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
12 |
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 |
|---|---|---|
Dash Point Campground
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Dash Point State Park
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Point Robinson Campground
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South 336th Street Stormwater Dam No 1
Lake Tapps Near Sumner
North Lake Fishing Access Federal Way