Hot Springs Mountain dominates this northern San Diego County landscape, serving as a focal point for a network of remote settlements and water sources. The area is characterized by several small communities and outpost locations, including San Ysidro, San Ignacio, and the aptly named Eagles Nest. These sites are linked by a rugged road system featuring routes such as Camino San Ignacio and Hot Springs Mountain Rd, which provide access to high-altitude points like the Hot Springs Mountain Lookout.
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1903 · Ramona
USGS Topo · 1:125,000
1904 · Indio
USGS Topo · 1:125,000
1904 · Southern California Sheet No. 2
USGS Topo · 1:250,000
1931 · Vallecito
USGS Topo · 1:125,000
1939 · Warner Springs
USGS Topo · 1:62,500
1939 · Santa Ysabel
USGS Topo · 1:62,500
1939 · Borrego
USGS Topo · 1:62,500
1941 · Clark Lake
USGS Topo · 1:62,500
1942 · Clark Lake
USGS Topo · 1:62,500
1942 · Borego
USGS Topo · 1:62,500