Aldarra Pond Dfr1, located in King County, Washington, is a privately owned earth dam constructed in 2001 for the primary purpose of flood risk reduction along Patterson Creek.
Wind
Humidity
The dam has a hydraulic height of 15 feet and a structural height of 14 feet, with a length of 1100 feet and a storage capacity of 53 acre-feet. Despite being non-federally owned and funded, the dam is regulated, permitted, inspected, and enforced by the Washington Department of Ecology, ensuring its compliance with state regulations.
This low-hazard dam has not been rated for condition assessment, and no emergency action plan (EAP) has been prepared or updated for it. While the risk assessment and management measures for the dam remain unspecified, it is reassuring to note that the dam's hazard potential is categorized as low. The last inspection conducted in August 2000 did not yield any specific condition assessment, indicating the need for ongoing monitoring and assessment to ensure the dam's continued effectiveness in flood risk reduction and safety for surrounding communities and ecosystems.
The Aldarra Pond Dfr1 serves as a vital infrastructure for flood risk management in the region, providing essential protection against potential flooding events along Patterson Creek. Its location in a high-risk flood zone underscores the importance of regular inspections, maintenance, and emergency preparedness to mitigate any risks associated with dam failure. As water resource and climate enthusiasts, it is essential to monitor the condition and management of dams like Aldarra Pond Dfr1 to safeguard water resources, ecosystems, and communities from the impacts of extreme weather events and climate change.
Year Completed |
2001 |
Dam Length |
1100 |
River Or Stream |
Patterson Creek - offstream |
Primary Dam Type |
Earth |
Surface Area |
3.32 |
Hydraulic Height |
15 |
Nid Storage |
53 |
Structural Height |
14 |
Hazard Potential |
Low |
Nid Height |
15 |
Raging River Near Fall City
|
758cfs |
Issaquah Creek Near Mouth Near Issaquah
|
1150cfs |
Snoqualmie River Near Carnation
|
49400cfs |
Snoqualmie River Near Snoqualmie
|
19100cfs |
Issaquah Creek Near Hobart
|
482cfs |
Tolt River Near Carnation
|
2050cfs |
| 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 38
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