The Green River in Southwest Wyoming delivers a rugged, high-country fly fishing experience. This stretch of the Green known by many as "The Upper" flows out of Fontanelle Reservoir and is known for producing some of the largest—and most aggressive—trout in the region. Anglers can expect opportunities at Rainbow, Brown, and native Cutthroat trout, and the often under appreciated but still majestic Rocky Mountain Whitefish.

Anglers can access this section at Warren Bridge and other public easements along U.S. Highway 191. Some areas require permission to cross private land. Wyoming fishing regulations apply, with some artificial-lure-only restrictions. Always check current rules and practice ethical fishing to help preserve this prime fishery.

The Green River fishes well year-round, but the best conditions vary by season. Spring offers excellent pre-runoff fishing, with hungry trout actively feeding on nymphs and streamers. Summer provides prime dry fly action, especially during hatches of mayflies, caddis, and terrestrials. Fall is a great time for targeting large browns preparing to spawn, while winter fishing can be productive in tailwater sections where flows remain steady. Checking water levels and weather conditions before a trip is essential, as runoff in late spring can make some areas difficult to fish.

Updated by Travis Vernon 7.22.26

The state of Wyoming is asking that anglers from Fontanelle dam down through Slate Creek monitor surface temps and stop fishing when temps climb above 65 Degrees. From Slate Creek downstream to Seedskadee and into the Flaming Gorge voluntarily follow the Hoot Owl rules. If you are releasing fish it is asked that angling stop at mid day (12 noon) and stay closed until 6 am. So we are asking that you only fish from 6 am until noon daily. We love this fishery and want to protect the fish there.

Currently at 699 cfs and while water is quite low it is fishing well. Since the water is so low there are a lot of wading opportunities. Temps were in the high 50s early am and then climbing to near 65 by 1-2pm. Watch the temps and be smart. There has been some rain/hail up there lately so be prepared and stay aware of the wind forecast.

We are seeing some great cutthroats, rainbows and browns being caught. Seeing a good amount of fish looking up chasing caddis, sallies, and PMD’s. Still used a caddis and a pmd emerger combo and did well. Picked up a few fish on some bigger foam this week also (Black and Tan Chubby). Sow bugs, caddis, leaches, crayfish, and pmd’s are still the primary fare for the bobber fisherman.