Location: The Green River enters Utah from the Flaming Gorge Reservoir dam and flows south into the Colorado River.

Course: The Green River is 730 miles long. It begins in the Wind River Mountain range of Wyoming. From there the river flows through the Green River Lakes then flows many miles south to Fontenelle Reservoir. After exiting Fontenell the river flows south into Flaming Gorge Reservoir. After exiting the Flaming Gorge Reservoir dam the River flows southeastern into Colorado then the river realizes how much Colorado sucks and it flows back into Utah. From Uintah County the river flows southwest past Vernal then south near the borders of Emery and Grand County. From here the river flows through the city of Green River, then flows south through the Canyonlands National Park before converging with the Colorado River.

Regulations: Updated 2018. From the Flaming Gorge Dam down river to the confluence of the Colorado River:
• No limit for channel catfish.
• No limit for burbot, northern pike, small-mouth bass or walleye. Anglers may not release any of these fish, which must be immediately killed.
• Species of threatened and endangered fish occur in the Green River. If you catch one of these fish, you must release it immediately.

From the Colorado state line in Browns Park upstream to Flaming Gorge Dam, including Gorge Creek, a tributary entering the Green River at Little Hole:
• Limit 3 trout (2 under 15 inches and 1 over 22 inches).
• All trout from 15 to 22 inches must be immediately released.
• No limit for burbot, northern pike, small-mouth bass or walleye. Anglers may not release any of these fish, which must be immediately killed.
• Artificial flies and lures only.
• CLOSED to fishing from a boat with a motor between the Utah-Colorado state line and Flaming Gorge Dam.
 

Tributaries: Ashley Creek, Brush Creek, Duchesne River, White River, Willow Creek, Price River, San Rafael River, Range Creek, and Nine Mile Creek.

History: The Green River was originally named Rio Buenaventura by Escalante in 1776. Although it was later re-named.