1991 Map of Big Foot Mountain

About this map

Diamond D Ranch and Rockpile Ranch anchor the remote topography of the Mendocino and Sonoma County border, illustrating the large-scale ranching operations that have long characterized this part of the California Coast Ranges. The landscape is defined by a dense network of watercourses, with Rancheria Creek winding through the northern reaches while the Wheatfield Fork Gualala River drains the southern territory. Significant elevation changes are marked by peaks such as Big Foot Mtn, Crystal Peak, and Buck Mtn. To the southeast, the waters of Lake Sonoma appear, framed by the prominent Thompson Ridge. This 1991 provisional survey captures a moment before modern development significantly altered the drainage patterns of the various canyons, including Big Foot Canyon and Franks Canyon, which provide a complex watershed for the Gualala River system.