Fishing on the shore of Mills Lake. NPS Photo by Marino. Sport fishing is permitted in Rocky Mountain National Park. Fishing activities are balanced with efforts to restore and perpetuate natural aquatic environments and life. Fishing was popular with early settlers and visitors in the Rocky Mountains. In an attempt to improve the sport, many streams and lakes were stocked with non-native species of trout. Waters with no sport fish were also stocked. The National Park Service stocked non-native Yellowstone cutthroat trout as late as 1969. The only trout native to the park are the greenback cutthroat and the Colorado River cutthroat.
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