Expedition Island

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Expedition Island
Expedition Island Green River Wyoming.jpeg
View from southern shore of the Green River
Expedition Island is located in Wyoming
Expedition Island
Expedition Island is located in the US
Expedition Island
Location Green River, Wyoming
Coordinates 41°31′23″N 109°28′16″W / 41.523°N 109.471°W / 41.523; -109.471Coordinates: 41°31′23″N 109°28′16″W / 41.523°N 109.471°W / 41.523; -109.471
Built 1869
NRHP Reference # 68000056
Significant dates
Added to NRHP November 24, 1968[1]
Designated NHL November 24, 1968[2]

Expedition Island is a park in Green River, Wyoming, that marks the area 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 a similar expedition down the two rivers in 1869.

These two expeditions are generally considered to have covered the last large land area in the continental United States left unexplored by European-Americans.

Expedition Island was designated a National Historic Landmark on November 24, 1968.[2][3]


  1. ^ National Park Service (2007-01-23). "National Register Information System". National Register of Historic Places. National Park Service. 
  2. ^ a b "Expedition Island". National Historic Landmark summary listing. National Park Service. Retrieved 2007-10-20. 
  3. ^ Stephen Lissandrello (January 3, 1976). "National Register of Historic Places Inventory-Nomination: Expedition Island" (pdf). National Park Service.  and Accompanying 5 photos, from 1975 and c.1900. (824 KiB)

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