May Valley is a natural floodplain and historically has experienced periodic and sometimes extensive flooding. Through the years, this problem worsened as channelizing of streams and development in upland areas increased stormflows to the valley, and as natural deposition of sediment in May Valley continued to reduce the conveyance capacity of the May Creek channel. May Creek canyon, through which lower May Creek flows, is an undeveloped park in the Cities of Renton and Newcastle where soft trails may be built in the future. Expansion of access to this park and the purchase of additional lands are priorities for the cities. Many residents view May Creek Park as an important community amenity. Erosion and sedimentation occur as a result of natural processes in all stream systems. Much of the erosion and sediment transport in May Creek is a result of development in the basin. The May Creek basin continues to provide high quality tributary habitat to the Lake Washington watershed; however, use of May Creek by salmon and other wildlife is declining due to habitat loss, erosion, sedimentation, and deteriorating water quality. As more development occurs throughout the basin, many of these problems are anticipated to worsen unless steps are taken to address these issues. For this reason, measures are needed to restore the natural functions of the basin and maintain the quality of lif
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