
The Sierra Nevada high country at Blue Canyon is a landscape defined by historic transit corridors and deep-canyon resource extraction. The Southern Pacific railroad and the Emigrant Trail converge near Nyack, marking a vital mountain pass. Evidence of the region’s mining heritage is visible in the clusters of claims north of the South Fork Yuba River, including the Mountain View Mine and the Eagle Bird Mine. The map reveals a complex water management system of flumes and canals feeding into Lake Spaulding and the Fuller Lake Spillway, supporting the hydroelectric infrastructure at Camp Spaulding. From the Emigrant Gap Historical Marker to the remote settlement of Omega, this survey details the intersection of early pioneer routes and modern transportation engineering.
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This is the sole edition of this map. No revisions or reprints were ever made.
1891 · Colfax
USGS Topo · 1:125,000
1892 · Colfax
USGS Topo · 1:125,000
1894 · Colfax
USGS Topo · 1:125,000
1898 · Colfax
USGS Topo · 1:125,000
1900 · Colfax
USGS Topo · 1:125,000
1902 · Colfax
USGS Topo · 1:125,000
1938 · Colfax
USGS Topo · 1:125,000
1949 · Alleghany
USGS Topo · 1:24,000
1950 · Colfax
USGS Topo · 1:62,500
1950 · Dutch Flat
USGS Topo · 1:24,000