
The Trinity Mountains define the high country of this Northern California survey, where the border between Trinity Co and Shasta Co cuts through a landscape of steep ridges and deep gulches. Land use is marked by a history of resource extraction and seasonal grazing, evidenced by the Lamoine Mill (Site) and high-altitude outposts like Heavy Sheep Camp and Sugar Pine Sheep Camp. The eastern slopes are dominated by complex ridgelines including Horsebone Ridge, Onion Creek Ridge, and McKinsey Ridge, which transition toward the Shasta-Trinity National Forest.
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1886 · Shasta
USGS Topo · 1:250,000
1890 · Red Bluff
USGS Topo · 1:250,000
1894 · Red Bluff
USGS Topo · 1:250,000
1894 · Shasta
USGS Topo · 1:250,000
1901 · Redding
USGS Topo · 1:125,000
1913 · Weaverville
USGS Topo · 1:125,000
1923 · Sawyers Bar
USGS Topo · 1:125,000
1931 · Etna
USGS Topo · 1:96,000
1934 · Etna
USGS Topo · 1:125,000
1935 · Dunsmuir
USGS Topo · 1:125,000