Keywords: Expedition Island Green River Wyoming.jpeg 68000056 Expedition Island a National Historic Landmark in Green River Wyoming United States is a small island in the Green River Now a city park Expedition Island is recognized as the launching point for John Wesley Powell's 1869 and 1871 expeditions to explore the Colorado River and Grand Canyon own Ntsimp 2011-07-01 41 31 18 5 N 109 28 14 W heading N Cc-zero Green River Wyoming Islands of the United States National Historic Landmarks in Wyoming Parks in Wyoming National Register of Historic Places in Sweetwater County Wyoming |