Xingu Indigenous Park film "Xingu" (2012). The idea of creating a park originated with a round table organized by the vice president of Brazil in 1952, at which a much larger park was proposed. However, the state of Mato Grosso began granting land within the proposed area to colonizing companies, so the park that came into existence by decree 50.455 of 14 April 1961 was only a quarter of the proposed size. Adjustments were made on 31 July 1961, 6 August 1968 and 13 July 1971. The final demarcation of the perimeter was made in 1978. The area was given the designation of
South Fork American River Creek, and Silver Fork American River. Most of the watershed consists of high, forested mountains and steep-sided valleys that receive up to of annual precipitation, except for the westernmost section which consists of drier foothill country. The river also contributes about a third of the total outflow of the American River system. According to a U.S. Geological Survey stream gage at Lotus, about above Folsom Lake, the average discharge was from 1951 to 1995. The highest recorded flow was on January 1, 1997 (see ), and the lowest monthly mean was in July 1977. Rafting and Kayaking The South Fork