Klahanie Stormwater Detention Dam No 1 dam
Klahanie Stormwater Detention Dam No 1
Klahanie Stormwater Detention Dam No 1, located in Issaquah, Washington, was completed in 1984 with the primary purpose of flood risk reduction along the Tr-Laughing Jacobs Lake Outlet. This earth dam stands at a hydraulic height of 9 feet and spans 400 feet in length, providing a storage capacity of 16 acre-feet to handle a maximum discharge of 50 cubic feet per second. The dam's fair condition assessment and significant hazard potential highlight the importance of regular inspections to ensure its structural integrity.
Managed by the Washington Department of Ecology, this local government-owned structure plays a crucial role in protecting the surrounding area from potential flooding events. With a drainage area of 0.74 square miles, the dam's normal storage capacity of 8 acre-feet helps regulate water levels and mitigate flood risks. Despite its fair condition, the dam's inspection frequency of every 5 years ensures that any necessary maintenance or repairs are addressed promptly to uphold its effectiveness in flood control.
As climate change continues to impact water resources and precipitation patterns, the Klahanie Stormwater Detention Dam No 1 serves as a vital infrastructure asset in managing stormwater runoff and reducing flood risks in the region. With a strategic location and design tailored for flood risk reduction, this earth dam stands as a testament to proactive measures taken to safeguard communities and enhance water resource resilience in the face of changing environmental conditions.
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 Klahanie Stormwater Detention Dam No 1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Issaquah Creek Near Mouth Near Issaquah | 44 cfs | → |
| Raging River Near Fall City | 32 cfs | → |
| Issaquah Creek Near Hobart | 27 cfs | → |
| Mercer Creek Near Bellevue | 12 cfs | → |
| Snoqualmie River Near Carnation | 1,430 cfs | → |
| Snoqualmie River Near Snoqualmie | 1,610 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Klahanie Stormwater Detention Dam No 1.
Boat launches
- Northeast Tolt Hill Road 30348-30762, Carnation
- West Lake Sammamish Parkway Northeast Redmond
- I 90 Trail Bellevue
- Lake Langlois Road Northeast King County
- Southeast Fish Hatchery Road 36495-37159, Fall City
- Mercer Island Boat Launch
Campgrounds
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
- Quartz Road To Confluence With Middle Fork Snoqualmie River
- Alpine Lakes Wilderness Boundary To Quartz Creek Road
- Confluence Of Tye And Foss Rivers To Gold Bar
Track Klahanie Stormwater Detention Dam 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 Klahanie Stormwater Detention Dam No 1
Where does the data for Klahanie Stormwater Detention Dam 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 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 Klahanie Stormwater Detention Dam No 1.