Twenty-five Mile Creek is a major perennial fish-bearing tributary of Lake Chelan. Fish presence in Twenty-five Mile Creek includes native westslope cutthroat trout (Oncorhynchus clarki lewisi), stocked rainbow trout (Oncorhynchus mykiss), kokanee salmon (O. nerka), eastern brook trout (Salvelinus fontinalis) and suckers (catostomus sp.). (USFS 1998). Kokanee escapement has ranged from over 5,500 in 1989 to less than 100, and in 2011 escapement was approximately 2,000. (Archibald 2011).
The objective of the 25 Mile Creek Passage Improvement Project is to develop engineering alternatives and select a preferred solution to rectify a fish passage barrier at river mile 0.22. The existing box culvert was constructed with a concrete apron, which, due to scour, causes a three-foot drop and represents a significant migration barrier for kokanee, rainbow trout, and Westslope cutthroat trout. Providing fish passage at this site would open 2-3 miles of spawning and rearing habitat for native (and introduced) salmonids.
A copy of the final altenatives report can be dowloaded here: Twenty Five Mile Creek Fish Passage Alternatives Analysis.pdf
In partnership with Chelan County (Rocky Reach Fish Forum).
Completed: October 31st, 2013