Quadrant Lake No 1 dam
Quadrant Lake No 1
Quadrant Lake No 1, located in Federal Way, Washington, is a privately owned gravity dam that was completed in 1994 for flood risk reduction purposes. With a structural height of 8 feet and a length of 180 feet, the dam has a maximum storage capacity of 113 acre-feet and a normal storage of 57 acre-feet. It serves a drainage area of 0.73 square miles and can discharge up to 480 cubic feet per second.
Managed by the Washington Dept of Ecology, Quadrant Lake No 1 is state regulated and inspected to ensure its safety and compliance with regulatory standards. With a low hazard potential and a condition assessment of "Not Rated," the dam has not undergone recent inspections or risk assessments. While emergency action plans and inundation maps are not currently prepared, the dam's performance and risk management measures are not detailed in the available data.
Overall, Quadrant Lake No 1 plays a crucial role in flood risk reduction in the area, highlighting the importance of effective management and monitoring of water resources to mitigate potential hazards and ensure public safety. For water resource and climate enthusiasts, this dam serves as a fascinating case study in dam engineering and regulatory oversight in the state of Washington.
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 Quadrant Lake No 1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Green River Near Auburn | 540 cfs | → |
| Lake Tapps Diversion At Dieringer | 23 cfs | → |
| Puyallup River At Puyallup | 2,320 cfs | → |
| Clarks Creek At Tacoma Road Near Puyallup | 130 cfs | → |
| Mill Creek At Earthworks Park At Kent | 1 cfs | → |
| Big Soos Creek Above Hatchery Near Auburn | 72 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Quadrant Lake No 1.
Boat launches
- North Lake Fishing Access Federal Way
- King County
- Lake Fenwick Trail Kent
- Southeast Green Valley Road 12507-12565, Auburn
- Dockton Road Southwest 25905, Vashon
- Southwest Harbor Drive 8900, Vashon
Campgrounds
- Dash Point Campground
- Dash Point State Park
- Point Robinson Campground
- Gig Harbor Rv Resort
- Holiday Park Military - Mcchord Afb
- Kopachuck State Park
Paddle runs
- Huckleberry Creek To Confluence With Clearwater River
- 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
- Confluence With Ipsut Creek To Western Boundary Of Mount Rainier National Park
- Headwaters On The Nw Slope Of Mount Rainier At Carbon Glacier To Confluence With Ipsut Creek
Track Quadrant Lake No 1 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 Quadrant Lake No 1
Where does the data for Quadrant Lake No 1 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 Low 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 Quadrant Lake No 1.