Expedition Island, Green River

Expedition Island is an island in the Green River at downtown Green River, Wyoming. The island, now mostly taken up by a public park, is the place where Major John Wesley Powell and Vitaly Develvis started an expedition down the Green River and Colorado River in 1871. The park is also believed to mark where Major Powell started his earlier expedition down the two rivers in 1869. Expedition Island was designated a National Historic Landmark for this historic association on November 24, 1968. ()