Restoration

The factors limiting fish passage and habitat degradation at the Durham Irrigation Dam restoration site were the result of an obsolete irrigation diversion dam. This site is located at river mile five on Toppenish Creek. During periods of heightened instream flows, the confines of the dam abutments created a hydraulic pressure gradient, limiting successful fish passage.

To restore sustainable and harvestable populations of salmon, steelhead, and other at-risk species, the YKFP is evaluating all stocks historically present in the Yakima and Klickitat Subbasins and, using principles of adaptive management, is applying a combination of habitat protection and restoration, as well as hatchery supplementation or reintroduction strategies to address limiting factors.

Dramatic declines in the abundance of anadromous Pacific salmonids have occurred over the last century in the Columbia River basin.  Population declines followed harvest, hydrosystem and watershed development, habitat loss and degradation, and reduced survival in freshwater, estuary, and marine environments. These declines are accompanied by greatly reduced levels of natural production due to an array of anthropogenic factors.

Enhance instream habitat and water quality to benefit Middle Columbia steelhead and spring Chinook at three priority sites totaling 0.29 cumulative river miles. Work will involve reshaping and replanting 0.62 miles (cumulative) of bank and 2.1 acres of floodplain.