The historical marker is at entrance to Reading Island Park, 213 Adobe Road in Cottonwood. The marker was placed there by the California State Department of Public Works - Division of Highways. A second marker is on Main Street just north of the Bowman Road and Interstate 5 at 40°22′16″N122°16′59″W / 40.371°N 122.283°W / 40.371; -122.283[4][5]