
Willamette National Forest encompasses this section of the Cascade Range, where the high-altitude landscape is defined by its volcanic geology and historical transit corridors. The most significant cultural marker is the Santiam Wagon Road West Trl, a vital pioneer route that traverses the quadrangle through Lost Prairie. This historical artery runs parallel to several modern forest trails, indicating the long-standing importance of this pass for crossing the mountains.
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1927 · Mt. Jefferson
USGS Topo · 1:125,000
1929 · Mill City
USGS Topo · 1:125,000
1929 · Three Sisters
USGS Topo · 1:125,000
1930 · Mt. Jefferson
USGS Topo · 1:125,000
1932 · Three Sisters
USGS Topo · 1:125,000
1934 · Mc Kenzie Bridge
USGS Topo · 1:96,000
1940 · Mc Kenzie Bridge
USGS Topo · 1:125,000
1953 · Salem
USGS Topo · 1:250,000
1954 · Salem
USGS Topo · 1:250,000
1955 · Echo Mountain
USGS Topo · 1:62,500