DESCRIPTION
A 1998 WDFW survey identified 78 full and partial fish passage barriers in the Beaver Creek Drainage. This project ameliorated 5 of these barriers, beginning with the first barrier found upstream from the mouth.
The barriers were created by the continued need for revetment of irrigation diversion check dams to provide water levels necessary to convey water into diversion ditches. We removed 4 of the dams, and replaced them with instream structures that will alter the stream geometry to create hydraulic conditions that fall within the swimming and jumping capabilities of salmonids. A fishway was installed to allow passage over the permanent concrete diversion dam. One of the diversions was replaced with a well, and instream work restored the natural stream morphology within the region.
The Habitat Limiting Factors Report for the Methow Watershed (WA Conservation Commission, 2000) ranked restoration of fish passage and screening of water diversions second only to the protection of properly functioning habitat. The limiting factors report also specifically identified lack of access to spawning and rearing habitat as limiting in the Beaver Creek drainage.
Techniques that improve conditions favoring high survival and abundance through critical stages, thus increasing carrying capability, should benefit the resource, particularily under conditions of exploitation of stress from human or environmental factors.