The Mayacmas Mountains dominate the landscape of this 2015 survey, defining the rugged border between Lake County and Mendocino County. This region is characterized by significant topographic relief, where prominent landmarks like Monument Peak, Gilliam Rock, and Cloverdale Peak rise above the surrounding drainage basins. The area serves as a vital watershed, with numerous tributaries such as Highland Cr and Adobe Cr feeding into the Highland Springs Reservoir and Adobe Reservoir. These water features, alongside High Valley and Tyler Valley, reflect the complex geological and hydrological patterns of the northern California Coast Ranges.
47 named features on this map. Tap any name to fly to it.
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This is the sole edition of this map. No revisions or reprints were ever made.
1920 · Ukiah
USGS Topo · 1:62,500
1921 · Kelseyville
USGS Topo · 1:62,500
1938 · Lakeport
USGS Topo · 1:62,500
1938 · Hopland
USGS Topo · 1:62,500
1943 · Kelseyville
USGS Topo · 1:62,500
1943 · Hopland
USGS Topo · 1:62,500
1944 · Ukiah
USGS Topo · 1:62,500
1944 · Hopland
USGS Topo · 1:62,500
1947 · Santa Rosa
USGS Topo · 1:250,000
1949 · Santa Rosa
USGS Topo · 1:250,000