The 82 mile Kenai River is known for huge runs of King Salmon (aka Chinook).
The lower Kenai is from Skilak Lake down to Cook Inlet. Fly fishermen crowd the lower Kenai River during the runs.
The upper Kenai is from Kenai Lake down to Skilak Lake. The upper Kenai River is well-known for its large rainbow trout and Dolly Varden. About seven miles from Kenai Lake is the confluence with the Russian River
Overall, Kenai River is the 8th most popular fly fishing river of all 18 fly fishing spots in Alaska.