Crystal Lake serves as a central landmark in this high-elevation portion of the San Gabriel Mountains, where a complex network of recreation sites and peaks defines the landscape. The geography is marked by significant summits like Mount Baden-Powell and Mount Islip, connected by high-altitude passes such as Islip Saddle and Vincent Gap. Recreational infrastructure is prominent throughout the terrain, including the Yerba Santa Amphitheater, the Lodgepole Picnic Area, and several established camps like Coldbrook Campground.
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1894 · Pomona
USGS Topo · 1:62,500
1897 · Pomona
USGS Topo · 1:62,500
1897 · Cucamonga
USGS Topo · 1:62,500
1898 · Pomona
USGS Topo · 1:62,500
1900 · Cucamonga
USGS Topo · 1:62,500
1901 · Southern California Sheet No. 1
USGS Topo · 1:250,000
1903 · Rock Creek
USGS Topo · 1:62,500
1903 · Cucamonga
USGS Topo · 1:62,500
1903 · San Antonio
USGS Topo · 1:62,500
1904 · Pomona
USGS Topo · 1:62,500