Pothole at Interstate State Park, 2013. Photograph by Minnesota Department of Natural Resources Staff.

St. Croix River, Dalles of the St. Croix. Includes view of Showboat Inn and Interstate Bridge, 1905–1949.

Dalles of the St. Croix, Interstate Park, Minnesota and Wisconsin, 1940.

Old Man of the Dalles of the St. Croix and bridge over the river, 1920.

Devil’s Chair, Dalles of the St. Croix, 1910.

George Henry Hazzard, 1889.

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.