Brown's Park, originally called Brown's Hole, is an isolated mountain valley along the Green River in Moffat County, Colorado and Daggett County, Utah in the United States. The valley begins in far eastern Utah, approximately 25 miles (40 km) downstream from Flaming Gorge Dam, and follows the river downstream into Colorado, ending at the Gates of Lodore in Dinosaur National Monument. Known as a haven for outlaws such as Butch Cassidy during the late 19th century, it is now the location of the Browns Park National Wildlife Refuge. It was also the birthplace of Ann Bassett.