Big Sandy River (Wyoming)

The Big Sandy River is a significant tributary of the Green River in southwestern Wyoming, United States. It is approximately 146 miles (235 km) long and drains a remote and sparsely populated region. Its name is derived from the sandy nature of its bed and banks.

The river's headwaters originate in the Wind River Range, specifically from glaciers and snowmelt near the Continental Divide. It flows generally south, passing through the Bridger-Teton National Forest and the vast sagebrush steppe of the Wyoming Basin. Key tributaries include the Little Sandy River.

The Big Sandy River plays a crucial role in irrigation and agriculture in the arid landscape it traverses. Several reservoirs and diversion structures have been constructed along its course to manage water resources. These include the Big Sandy Reservoir, which provides water storage for irrigation and recreation.

The river's watershed supports a variety of wildlife, including trout, ungulates such as elk and deer, and various bird species. Fishing and hunting are popular recreational activities in the area.

The Big Sandy River has a relatively low population density along its course, with the primary land use being ranching and livestock grazing. The towns closest to the river include Farson and Eden.

The river's flow is subject to considerable seasonal variation, with peak flows occurring during spring snowmelt and lower flows during the late summer and fall. Water management practices aim to balance the needs of agriculture, recreation, and ecosystem health.