
The Middle Fork Feather River carves a deep path through the northern reach of this quadrangle, defining the steep elevation changes that once drove the region's mining and hydraulic operations. By the mid-1990s, the landscape within the Plumas National Forest shows a transition from active extraction to recreation and preservation, with the Pacific Crest Nat Scenic Trail traversing the high ridges. Remnants of the Gold Rush era are preserved in the locations of the Nelson Point (Site) and several scattered operations such as the Buckhorn Mine and Bunker Hill Mine.
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1891 · Downieville
USGS Topo · 1:125,000
1893 · Downieville
USGS Topo · 1:125,000
1895 · Downieville
USGS Topo · 1:125,000
1896 · Downieville
USGS Topo · 1:125,000
1897 · Downieville
USGS Topo · 1:125,000
1937 · Blairsden
USGS Topo · 1:48,000
1943 · Blairsden
USGS Topo · 1:62,500
1950 · Spring Garden
USGS Topo · 1:24,000
1950 · Quincy
USGS Topo · 1:24,000
1950 · Onion Valley
USGS Topo · 1:24,000