Santa Cruz, CA
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  Portland, OR
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East Valley Mine Wetland Mitigation Project

DSCN1337 Exist Channel webClient: MCS, Corp.

Waterways recently prepared detailed engineering plans and specifications to construct a wetland mitigation site in the historic floodplain of Yakima River in Washington. The site was historically leveled and channelized for livestock grazing before being purchased by the Bureau of Land Management (BLM). BLM has been managing the property to reduce invasive weeds for several years in anticipation of this project, which was initiated as a mitigation site for a nearby gravel mining operation with direct impacts to a nearby wetland.


The site is approximately thirty-two acres and currently consists of three channels conveying irrigation return flow through the site. A dam at the downstream end of the site, which was constructed to elevate the water surface for purposes of irrigation, has been flanked in recent years and is now a fish passage barrier. The design includes four widened channels to convey water through the site, with roughened channel segments designed to allow for fish passage while dropping elevation down the channel. Hummocks are also included with vertical habitat logs to provide habitat for a variety of wildlife. Construction of this project is planned for the summer of 2016.