A conservation group is suing the U.S. Forest Service over a corral in the Gros Ventre drainage in northwest Wyoming.

The Western Watershed Project says the corral blocks the migration of pronghorn from Grand Teton National Park to the upper Green River valley.

The Jackson Hole News & Guide reports  that the lawsuit was filed in U.S. District Court in Cheyenne this month.

The corral and associated holding pasture would aid in the loading and unloading of 1,300 cattle that spend the summer on a grazing allotment.

The Forest Service has identified the corral and holding pasture as potential obstructions to pronghorn movement.

However, in a 2010 Forest Service decision, the agency determined there's no evidence to suggest the corral will impede the pronghorn migration.