Bartlett Springs serves as the focal point of this 2015 survey, situated within the mountainous terrain of the Mendocino National Forest at the Lake County and Colusa County boundary. This area is defined by a high concentration of natural mineral springs and glades, including Newman Springs and Addington Springs, which historically drew visitors to these remote highlands. The landscape is marked by open clearings like Root Glades and White Ranch Glades, indicating the region's agricultural and ranching history.
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1922 · Hullville
USGS Topo · 1:62,500
1924 · Bartlett Springs
USGS Topo · 1:62,500
1938 · Lakeport
USGS Topo · 1:62,500
1942 · Bartlett Springs
USGS Topo · 1:62,500
1944 · Bartlett Springs
USGS Topo · 1:62,500
1951 · Lake Pillsbury
USGS Topo · 1:62,500
1951 · Lakeport
USGS Topo · 1:62,500
1951 · Stonyford
USGS Topo · 1:62,500
1957 · Ukiah
USGS Topo · 1:250,000
1958 · Clearlake Oaks
USGS Topo · 1:24,000