North of Redding and just south of Mount Shasta, the Upper Sacramento River is a 35 mile fly fishing section from Box Canyon Dam of Lake Siskiyou to Lake Shasta. This scenic river is known for its dense population of rainbow trout averaging 12 inches, but up to 20 inches. The river alternates winding through several canyons and widening into narrow valleys. Most of the Upper Sacramento River is catch-and-release for fly fishing.
There are good access points at Ney Springs, a couple miles below the dam, and also upstream of Dunsmuir.
Overall, Upper Sacramento River is the 11th most popular fly fishing river of all 17 fly fishing spots in California.