The South Ridge Stormwater Detention Dam, located in Issaquah, Washington, is a private-owned structure designed by Concept Engineering to reduce flood risk along the North Fork Issaquah Creek.
Wind
Humidity
Completed in 2002, this earth dam stands at a hydraulic height of 10 feet and a length of 430 feet, with a storage capacity of 25 acre-feet. The dam serves as a crucial tool in managing stormwater runoff and protecting the surrounding community from potential flooding events.
With a hazard potential rated as high, the South Ridge Dam undergoes regular inspections to ensure its structural integrity and effectiveness in flood risk reduction. The condition assessment conducted in 2018 deemed the dam to be in satisfactory condition. The Washington Department of Ecology regulates the dam, and it is subject to state permitting, inspection, and enforcement to maintain compliance with safety standards. The dam's location in King County, Washington, adds to its significance in managing water resources and climate challenges in the region, highlighting the importance of sustainable infrastructure for resilient communities.
As a key component in the flood risk reduction strategy for the area, the South Ridge Stormwater Detention Dam plays a crucial role in safeguarding the community from potential inundation events. With its design focused on earth and stone materials, the dam efficiently manages stormwater runoff from a drainage area of 0.1 square miles, providing a storage capacity of 22 acre-feet under normal conditions. The dam's presence underscores the importance of proactive water resource management in mitigating the impacts of climate change and enhancing community resilience to extreme weather events.
Year Completed |
2002 |
Dam Length |
430 |
River Or Stream |
NF Issaquah Creek - Offstream |
Primary Dam Type |
Earth |
Surface Area |
1.9 |
Hydraulic Height |
10 |
Drainage Area |
0.1 |
Nid Storage |
25 |
Structural Height |
10 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
10 |
Issaquah Creek Near Mouth Near Issaquah
|
300cfs |
Raging River Near Fall City
|
175cfs |
Issaquah Creek Near Hobart
|
136cfs |
Mercer Creek Near Bellevue
|
12cfs |
Cedar River At Renton
|
5160cfs |
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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