Pacheco Pass serves as the focal point for this survey, marking the crossing between Santa Clara and Merced Counties along the State Route 152 corridor. The eastern landscape is dominated by the sprawling waters of the San Luis Reservoir, which features local landmarks such as Tunnel Island and Cottonwood Bay. This 2018 study reveals a complex network of recreational trails and remote water sources scattered across the Diablo Range foothills.
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This is the sole edition of this map. No revisions or reprints were ever made.
1919 · Hollister
USGS Topo · 1:48,000
1920 · Pacheco Pass
USGS Topo · 1:62,500
1921 · Gilroy Hot Springs
USGS Topo · 1:62,500
1921 · Hollister
USGS Topo · 1:62,500
1922 · Quien Sabe
USGS Topo · 1:62,500
1922 · San Luis Creek
USGS Topo · 1:31,680
1922 · Howard Ranch
USGS Topo · 1:31,680
1923 · Hollister
USGS Topo · 1:62,500
1939 · Gilroy Hot Springs
USGS Topo · 1:62,500
1940 · Gilroy Hot Springs
USGS Topo · 1:62,500