The East Fork is a small stream populated mostly by Rainbow Trout, Cutthroat Trout and a few Brown Trout. Although fishable throughout the season, it is only floatable during high water in May and June which conveniently coincides with the Salmon Fly hatch.
The West Fork is somewhat larger than the East Fork. Its flow is controlled by a dam at Painted Rocks Reservoir for the purpose of irrigation and also to maintain minimum flows of water protecting the trout population down-river. The West Fork is home to mostly Cutthroat Trout, with good numbers of Brown Trout and Rainbow Trout. It also has an excellent Salmon Fly hatch and fishes well throughout the summer.
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