North of Vernal near Dutch John, the Green River below the Flaming Gorge Dam is known as one of the best tailwater fly fishing areas in the US. The 30 mile section below the dam can be fished from shore or by floating. The section passes through a red canyon gorge. You can expect to find brown trout, rainbow trout and cutthroats averaging over 16 inches. In fact, in 1996 a 30 pound brown trout was caught. The stable water temperatures promote a long season with an average of over 6,000 fish per mile.
The most popular stretch for fly fishing on the Green River is the 7 mile section from the dam to Little Hole. The water has better clarity and the fish are plentiful. Plus, the canyon is over 1,000 feet deep. If you plan to float, keep in mind that there are several Class II and Class III rapids. In the summer, rafters and kayakers are also plentiful on this section. There are several hiking trails for access to wading spots.
The next section from Little Hole to Indian Crossing is 8 miles long and is much less crowded. The first 3 miles are the best up to Red Creek, after which the water becomes more murky (and has more rapids).
The last section below Indian Crossing is 17 miles long and has the largest fish. However, the reliability of the fish is not consistent. The water makes for easy floating and the flat shore is nice for wading. But, the winds can really be strong.
There are paved roads to just below the dam and to Little Hole.
The main caddis hatch for fly fishing on the Green River is in July and August.
Note: The printable fly fishing river map is provided courtesy of HANDYMICROFIBERCLOTH.COM.
Overall, Green River is the 1st most popular fly fishing river of all 12 fly fishing spots in Utah.