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Browns Canyon National Monument is a 21,586 acres (87 km2) national monument in Chaffee County, Colorado, that was designated as such by President Barack Obama under the Antiquities Act on February 19, 2015. The site will be centered along the Arkansas River between Buena Vista and Salida. Browns Canyon is the most popular destination for whitewater rafting in the country, and is also known for its fishing and hiking. The monument will provide habitat protection for bighorn sheep, peregrine falcons, elk, and golden eagles. Designation of the monument was requested by numerous Colorado lawmakers, including Senators Michael Bennet and Mark Udall, Representative Joel Hefley and Governor John Hickenlooper. It was opposed by Representatives Ken Buck and Doug Lamborn, who objected to the president's use of executive action in declaring the monument. Lamborn also objected to the effect that the monument's creation would have on grazing, mineral and water rights; in response, the White House stated that the designation would honor "valid and existing rights, but withdraws the area from future mineral leasing." The monument is run jointly by the Bureau of Land Management and United States Forest Service.