The Santa Ana River carves through this dense corridor of Riverside and San Bernardino counties, acting as a natural boundary between the expanding suburban grids and flood control zones. To the south, the city of Corona is framed by its municipal airport and the industrial activity around Porphyry, while the prominent Lake Norconian sits at the heart of Norco. The landscape transitions from the residential developments of Eastvale and Jurupa Valley to the infrastructure-heavy wetlands of the Prado Flood Control Basin. Aviation history is well-represented here, with both Chino Airport and the Corona Municipal Airport serving the region. Large-scale transit networks are evident in the BNSF Railway lines and the major thoroughfares like Limonite Ave and Hidden Valley Pky, which connect these established communities with the surrounding foothills near La Sierra Heights.
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1896 · San Bernardino
USGS Topo · 1:62,500
1897 · Cucamonga
USGS Topo · 1:62,500
1898 · San Bernardino
USGS Topo · 1:62,500
1900 · Cucamonga
USGS Topo · 1:62,500
1901 · Southern California Sheet No. 1
USGS Topo · 1:250,000
1901 · San Bernardino
USGS Topo · 1:62,500
1901 · Elsinore
USGS Topo · 1:125,000
1901 · Riverside
USGS Topo · 1:62,500
1902 · Corona
USGS Topo · 1:125,000
1903 · Cucamonga
USGS Topo · 1:62,500