May Valley Sediment Removal Project
The King County Department of Natural Resources and Parks performed sediment removal from May Creek and Long Marsh Creek during the summer of 2014. The purpose of this project was to reduce the extent and duration of overbank flooding in the area and to improve channel flow capacity. In addition to the sediment removal from the channel, the stream buffer was enhanced with native plants to discourage the growth of reed canary grass. Large wood was placed to improve fish habitat. The wetland to the west of 148th Avenue SE was also enhanced. The downstream end of the project was approximately 700 feet to the west of 148th Avenue SE in the City of Renton. The upstream end of the project was approximately 1,800 feet to the east of 148th Avenue SE in unincorporated King County. The project utilized many best management practices during construction to protect water quality. Post construction monitoring of the project area and the channel downstream of the project area will continue for a minimum of 10 years.
- Reduce overbank flooding
- Improve channel flow
- Remove flow obstructing reed canary grass and sediment
- Control sediment input in May Creek from Long Marsh Creek.
- Enhance the wetland and stream buffer along May Creek with native plants
|Completion of Environmental Review and Permitting||Fall 2013|
|Award of Construction Contract||June 2014|
|Planting of Native Vegetation||Fall 2014|
- May Creek Drainage Improvement Plans - 6.6MB PDF
- Environmental Checklist - 3.6MB PDF
- 2015 May Creek Drainage Improvement & Long Marsh Creek Sediment Management: Year One Monitoring Report - 6.5MB PDF
- 2015 May Creek Vegetation Monitoring: Methods & Results - 1.3MB PDF
- 2016 May Creek Vegetation Monitoring - 3.7MB PDF
- 2016 May Creek Drainage Improvement & Long Marsh Creek Sediment Management Year Two Monitoring Report - 4.9MB PDF
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For questions about this project, please contact Wes Kameda, project manager, WLR, Capital Services Unit