Near Ketchum, the Big Wood River runs about 50 miles from the headwaters near Galena Summit to Magic Reservoir. Expect to find plenty of rainbow trout on the upper sections, and look for brown trout averaging 13 inches in the lower sections. This freestone river averages about 75 feet wide, and supports good fly fishing from mid-June to October.
There is good access all the way along the length from SR75 which runs parallel. Although most people fish above Magic Reservoir, there is good tailwater fishing below the dam, too.
The Big Wood River is well-known for its huge hatches of mayflies, stoneflies and caddis.
Overall, Big Wood River is the 6th most popular fly fishing river of all 17 fly fishing spots in Idaho.