South End Arts District | Burlington VT

The Upper Green River Valley is a broad, glacially carved valley located in western Wyoming, USA.

Visual Characteristics

The valley floor is characterized by extensive sagebrush steppe and riparian zones along the Green River. Elevations range from approximately 7,000 feet (2,100 meters) at the valley floor to over 13,000 feet (4,000 meters) for surrounding mountain peaks. The Green River itself exhibits a variable color, often appearing brown or green depending on sediment load and depth. Rock formations in the surrounding mountains include granite and sedimentary layers.

Location & Access Logistics

The Upper Green River Valley is situated approximately 150 miles (240 km) west of Casper, Wyoming. Access is primarily via US Highway 191, which bisects the valley. Pinedale, Wyoming, serves as the main population center within the valley. Ample parking is available at designated access points along the river and at trailheads for surrounding wilderness areas. Public transport options are limited; the nearest major airport is Jackson Hole Airport (JAC), approximately 75 miles (120 km) northwest.

Historical & Ecological Origin

This valley is a product of Pleistocene glaciation, with U-shaped valleys and moraines evident from past ice sheet activity. Ecologically, it is a high-altitude desert steppe transitioning to montane ecosystems in the surrounding ranges. The Green River is a major tributary of the Colorado River system. Historically, the valley was a significant rendezvous point for fur trappers in the 19th century.

Key Highlights & Activities

Fishing for cutthroat and rainbow trout in the Green River is a primary activity. Hiking trails are available in the Wind River Range foothills, such as the trailheads near Elkhart Park. Wildlife viewing, including pronghorn, elk, and various bird species, is common. Horseback riding is also a popular pursuit.

Infrastructure & Amenities

Restrooms are available at some developed access points and campgrounds. Shade is limited in the open valley, primarily found in riparian areas. Cell phone signal (4G/5G) is inconsistent and generally unavailable in remote areas. Limited food vendors and services are available in Pinedale.

Best Time to Visit

The best months for visiting are June through September for optimal weather conditions and accessibility. Mid-morning and late afternoon offer the best lighting for photography due to lower sun angles. High tide is not a relevant factor for this inland valley.

Facts & Legends

The Upper Green River Valley is known for its historical significance as the site of the annual Green River Rendezvous, one of the most important fur trading gatherings in the American West. A local legend speaks of the "Green River Monster," a mythical creature said to inhabit the deeper pools of the river, though no verifiable evidence exists.

Nearby Landmarks

• Wind River Range (Directly East, 0km)
• Bridger-Teton National Forest (Surrounding, 0km)
• Pinedale Anticline (5km North)
• New Fork Lake (25km Northwest)
• Green River Lakes (40km Northeast)