The Big Creek runs 30 miles eastward through the Frank Church Wilderness-Of-No-Return to the confluence with the Middle Fork of the Salmon River. This catch-and-release river is known for its west-slope cutthroat trout, many above 14 inches. Access is provided from the headwaters, and a trail runs the northern shore for its entire length descending from 6,000 feet down to 3,500 feet at the confluence. There are plenty of stairstep pools and deep-plunge pools. This is a waders paradise since the run is too tough to float.
Overall, Big Creek is the 1st most popular fly fishing river of all 17 fly fishing spots in Idaho.