Log Jam at Taylors Falls, 1886.

The Dalles of the St. Croix River seen from the Wisconsin bank, July 2, 2009.

1939 swinging bridge over St. Louis River, Jay Cooke State Park, ca. 1950.

African American Civilian Conservation Corps fire fighters, northern Minnesota, ca. 1933. Photographed by the St. Paul Dispatch.

Workers at the Whitewater State Park CCC camp, ca. 1930s.

Civilian Conservation Corps camp, Sibley State Park, ca. 1930s.

Barracks at the Cut Foot Sioux camp, F-14, CCC Company 707 at Dear River, ca. 1938.

African American CCC Company 1728, Camp Temperance F-19, Tofte, 1934.

Civilian Conservation Corps, Company 1753, Elba, 1933. Photographed by George O. Mehl.

Conservation Corps knapsack used by Fred Fretheim, CCC Company 3707, Two Harbors, Minnesota, ca. 1936–1937.