Arroyo Simi flows through the heart of the valley, anchoring the residential and commercial growth of Simi Valley and Santa Susana. The landscape is a distinct blend of dense suburban development and active industrial extraction, with several major energy sites including the Tapo Ridge Oil Field and the Simi Oil Field dotting the northern ridges. The eastern gateway to the valley is defined by the steep terrain of the Santa Susana Pass, a historic transportation corridor where the Santa Susana Tunnel pierces the hillside to connect the region.
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This is the sole edition of this map. No revisions or reprints were ever made.
1900 · Triunfo Pass
USGS Topo · 1:62,500
1900 · Piru
USGS Topo · 1:62,500
1903 · Calabasas
USGS Topo · 1:62,500
1903 · Camulos
USGS Topo · 1:125,000
1903 · Santa Susana
USGS Topo · 1:62,500
1921 · Piru
USGS Topo · 1:62,500
1921 · Triunfo Pass
USGS Topo · 1:62,500
1925 · Chatsworth
USGS Topo · 1:24,000
1927 · Chatsworth
USGS Topo · 1:24,000
1929 · Chatsworth
USGS Topo · 1:24,000