Mount Fillmore and the surrounding high Sierra Nevada ridges dominate this landscape, which straddles the boundary between Plumas National Forest and Tahoe National Forest. The settlement of Poker Flat sits deep within the drainage of Canyon Creek, surrounded by a dense network of ravines and gulches such as China Ravine and Hog Gulch. This area's history of mineral extraction is evidenced by the Gibraltar Mine and various off-highway vehicle routes like the Craycroft Ridge OHV and Poker Flat OHV, which follow the difficult contours of the terrain.
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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 · Onion Valley
USGS Topo · 1:24,000
1951 · Onion Valley
USGS Topo · 1:24,000
1951 · Mt. Fillmore
USGS Topo · 1:24,000