
Harbin Springs and Anderson Springs anchor this portion of the Mayacmas Mountains, where the landscape is defined by its numerous mineral springs and mountain retreats. The map reveals a dense network of small communities including Hobergs, Whispering Pines, and Loch Lomond, many established around the geological features of the Lake and Sonoma county line. The prominence of Boggs Mountain State Forest and the nearby Cobb Mtn illustrate a region characterized by high-elevation settlements and resource management. Grounded in the rugged geography of the volcanic field, the transition from the valley floor at Collayomi Valley to the heights of Seigler Mtn highlights the area's historical reliance on seasonal tourism and geothermal activity. Tracing the drainages of Putah Cr and Big Canyon Cr, one can see how roads like Co Rd 107 follow the natural contours to connect these remote mountain outposts.
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This is the sole edition of this map. No revisions or reprints were ever made.
1920 · Healdsburg
USGS Topo · 1:62,500
1921 · Kelseyville
USGS Topo · 1:62,500
1927 · Calistoga
USGS Topo · 1:62,500
1933 · Healdsburg
USGS Topo · 1:48,000
1940 · Healdsburg
USGS Topo · 1:62,500
1943 · Calistoga
USGS Topo · 1:62,500
1943 · Kelseyville
USGS Topo · 1:62,500
1945 · Calistoga
USGS Topo · 1:62,500
1945 · Lower Lake
USGS Topo · 1:62,500
1947 · Santa Rosa
USGS Topo · 1:250,000