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Sammamish River’s Transition Zone
Sammamish River’s Transition Zone
Reconfiguring the Sammamish River’s Transition Zone to improve habitat and water quality while ensuring flood control
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Sammamish River’s Transition Zone
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The Sammamish River’s Transition Zone in Marymoor Park helps provide flood control along the Sammamish River while maintaining minimum water levels in Lake Sammamish. However, fish and wildlife habitat within the Transition Zone is severely limited and summer river temperatures are too high for salmon. Additionally, necessary but costly Transition Zone maintenance harms habitat and water quality, which conflicts with federal, state and local goals to protect ecological functions and species listed under the Endangered Species Act.
We would like public input as we review the design alternatives:
No Action
Widened Channel
Split Channel
The primary purpose of the Willowmoor Floodplain Restoration Project is to reconfigure the Transition Zone to improve habitat and water quality while ensuring its essential flood and lake level control functions.

More Info:
No Action
Widened Channel
Split Chanel
Project Overview
THIS SURVEY IS NOW CLOSED If you have any questions, please Email us.
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