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.
Wind
Humidity
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.
Year Completed |
1984 |
Dam Length |
400 |
River Or Stream |
Tr-Laughing Jacobs Lake Outlet |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
9 |
Drainage Area |
0.74 |
Nid Storage |
16 |
Structural Height |
9 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
9 |
Issaquah Creek Near Mouth Near Issaquah
|
300cfs |
Raging River Near Fall City
|
175cfs |
Issaquah Creek Near Hobart
|
136cfs |
Mercer Creek Near Bellevue
|
12cfs |
Snoqualmie River Near Carnation
|
9660cfs |
Snoqualmie River Near Snoqualmie
|
4380cfs |
| Location | Reservations | Toilets |
|---|---|---|
Tolt-MacDonald Park Campground
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Tolt MacDonald Park
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Site 27
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Site 36
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Site 37
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Site 40
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