The Diablo Range dominates this portion of Stanislaus County, where the landscape is defined by a dense network of canyons and ridges. Modern transit through the area is limited to rugged corridors like Upper Oak Flat Rd, while more remote reaches are accessible only via historic paths such as the Murphy Trl and the Rooster Comb Trl. Water drains through complex systems including N Fork Orestimba Cr and its tributaries, Sheep Thief Cr and Robison Cr. Significant topographical markers like Mikes Peak and Wilcox Ridge provide orientation across a territory punctuated by distinct natural flats and passes, including Jackass Flat and Days Pass. This 2018 survey represents the contemporary management of this undeveloped California backcountry, preserving the nomenclature of 19th-century livestock grazing and frontier travel.
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This is the sole edition of this map. No revisions or reprints were ever made.
1916 · Patterson
USGS Topo · 1:31,680
1919 · Orestimba
USGS Topo · 1:62,500
1919 · Orestimba Creek
USGS Topo · 1:31,680
1920 · Pacheco Pass
USGS Topo · 1:62,500
1921 · Gilroy Hot Springs
USGS Topo · 1:62,500
1938 · Mt. Boardman
USGS Topo · 1:62,500
1939 · Gilroy Hot Springs
USGS Topo · 1:62,500
1940 · Gilroy Hot Springs
USGS Topo · 1:62,500
1940 · Pacheco Pass
USGS Topo · 1:62,500
1941 · Orestimba
USGS Topo · 1:62,500