Southern California Regional Rocks and Roads

A tunnel on US 80?

October 10, 2026June 18, 2017

In the late 1940’s, plans were being drawn for improvements to US 80 in San Diego County. The highway, as it was then, had changed little since its last upgrade between 1928 and 1932. While much of the highway was on a better alignment than before, the section between Alpine and Descanso still needed more …

Image of the Week – 4/5/15

September 28, 2026April 5, 2015

Tunnels 2 and 3 in Wheeler Gorge on State 33 near Ojai, CA. Built in 1931.

Image of the Week – 2/16/15

October 7, 2026February 16, 2015

Road Building in San Gabriel Canyon

September 13, 2026April 8, 2014

In the early 1930’s, Los Angeles County began construction of an additional roadway over the San Gabriel Mountains via the East Fork of the San Gabriel River. The road, then known as the Camp Bonita – Prairie Fork Road, was about half complete with with four larger bridges and a tunnel, by early 1938. Work had …

A tunnel on US 80?

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Road Building in San Gabriel Canyon

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