204th Street Stormwater Detention Basin dam
204th Street Stormwater Detention Basin
Located in Des Moines, Washington, the 204th Street Stormwater Detention Basin is a private facility designed by CH2M Hill with a primary purpose of flood risk reduction. Completed in 2001, this Earth-type dam stands at a hydraulic height of 9 feet and a length of 1100 feet, with a storage capacity of 17 acre-feet. The basin covers a surface area of 2.7 acres and serves a drainage area of 0.56 square miles, with a maximum discharge capacity of 450 cubic feet per second.
Managed by the Washington Department of Ecology, the 204th Street Stormwater Detention Basin is subject to state regulation, permitting, inspection, and enforcement. With a fair condition assessment as of June 2019, the facility is classified as having a significant hazard potential. Regular inspections are conducted every 5 years to ensure its structural integrity and functionality. This detention basin plays a crucial role in mitigating flood risks and protecting the surrounding community from potential water-related hazards.
Dam data reference
Condition Assessment
- Satisfactory
- No 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.
- 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.
- 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.
Hazard Potential Classification
- High
- Dams 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, environmental 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.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around 204th Street Stormwater Detention Basin -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Mill Creek Near Mouth At Orillia | 6 cfs | → |
| Spring Brook Creek At Orillia | 6 cfs | → |
| Mill Creek At Earthworks Park At Kent | 1 cfs | → |
| Duwamish River At Golf Course At Tukwila | 6,700 cfs | → |
| Cedar River At Renton | 339 cfs | → |
| Green River Near Auburn | 758 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near 204th Street Stormwater Detention Basin.
Boat launches
- Lake Fenwick Trail Kent
- King County
- Southwest Harbor Drive 8900, Vashon
- 47th Avenue Southwest 10203, Seattle
- North Lake Fishing Access Federal Way
- Dockton Road Southwest 25905, Vashon
Campgrounds
- Point Robinson Campground
- Dash Point State Park
- Dash Point Campground
- Gig Harbor Rv Resort
- Cascadia Marine Trail
- Manchester State Park
Paddle runs
- Snoqualmie Falls To Plum's Landing
- Confluence With Taylor River To Confluence With North Fork Snoqualmie River
- Wagner Bridge To Confluence With Middle Fork Snoqualmie River
- Huckleberry Creek To Confluence With Clearwater River
- Brothers Wilderness Boundary To Olympic Nf Boundary
- Quartz Road To Confluence With Middle Fork Snoqualmie River
Track 204th Street Stormwater Detention Basin in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About 204th Street Stormwater Detention Basin
Where does the data for 204th Street Stormwater Detention Basin come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the Significant hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of 204th Street Stormwater Detention Basin.