There is not currently any stormwater runoff treatment infrastructure between SE 249th Street and SE 256th Street along Witte Road before stormwater is discharged into either the south or north fork of Jenkins Creek. The City of Maple Valley has been awarded a $75,000 grant for the design of stormwater treatment retrofits from the Washington State Department of Ecology to reduce pollutant loading to Jenkins Creek.
This project will design stormwater treatment retrofits for the existing Witte Road and Lake Wilderness Golf Course access road, as well as from the improved roadway width once the Witte Road Corridor Improvements have been completed for this section of Witte Road. The stormwater collection and treatment system will be designed to integrate with the completed Witte Road Improvement Project. The City has selected 4 locations for installation of stormwater bioretention facilities to treat runoff from the golf course parking lot, Witte Road, and the 220th Ave SE hill prior to discharge to Jenkins Creek.
Design is planned to be completed in early 2020 and the City has applied for construction grant funds from the Department of Ecology. Construction is planned for summer and early fall of 2020.
The City has held two open houses to discuss this project in summer and fall of 2019 and feedback from these open houses is being incorporated in our design.
For more information and comments, please contact Halley Kimball, PE, SWM/NPDES Program Manager at email@example.com or 425-413-6646.