A major limiting factor affecting the healthy function of the watershed/habitat is the presence of an unscreened surface water diversion located on South Fork Simcoe Creek. There has been a continuous effort since 2009 to identify three unscreened surface diversions that need to be screened. The Smartlowit diversion was screened in 2010. The feeder ditch on South Fork Simcoe Creek is the second to be screened of the three identified diversions.
On August 6, 2011, Yakama Nation Fisheries, Yakama Reservation Watersheds Project (YRWP) completed the implementation of a restoration action at two road/stream interfaces on Panther Creek to improve stream function and facilitate fish movement. Sites within the Panther Creek watershed have been degraded due to various human activities (e.g., grazing, road building, and logging). These problems are most obvious at the site on Panther Creek where Fort Simcoe Road # 80 transects T10N, R13E Section 13 and further downstream in T10N, R13E Section 26.
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.
Yakama Reservation Watersheds Project staff completed a bank stabilization and floodplain restoration project in and adjacent to Ahtanum Creek. Anthropogenic and natural factors have led to the rapid erosion of three stream meanders, a discontinuity between the floodplain and the stream, and a domination of non-native invasive vegetation within the project site. Endangered Species Act listed species: Mid-Columbia River steelhead trout and bull trout, Chinook, and coho; utilize Ahtanum Creek for multiple life history stages.