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Bridge over Grapevine Creek. Built in 1933 and removed in 1959.

Bridge over Grapevine Creek. Built in 1933 and removed in 1959.

Aerial view from around 1970 showing the Gavin Canyon bridges and the old southbound I-5 rest area.

Aerial view from around 1970 showing the Gavin Canyon bridges and the old southbound I-5 rest area.

California - U. S. highway 99, U. S. highway 70, and U. S. highway 60 sign.

California - U. S. highway 99, U. S. highway 70, and U. S. highway 60 sign.

1963 view of Piru Gorge, looking toward Pyramid Rock.

1963 view of Piru Gorge, looking toward Pyramid Rock.

California - U. S. highway 6, U. S. highway 99, and state highway 134 sign.

California - U. S. highway 6, U. S. highway 99, and state highway 134 sign.

Truck Escape Ramp in 1968 before the new southbound lanes were opened. Note the downhill traffic still using the roadway. Photo Courtesy - Gordon Glattenberg

Truck Escape Ramp in 1968 before the new southbound lanes were opened. Note the downhill traffic still using the roadway. Photo Courtesy - Gordon Glattenberg

US 6 / US 99 Junction – Tunnel Station | Southern California Regional Rocks and Roads

US 6 / US 99 Junction – Tunnel Station | Southern California Regional Rocks and Roads

Newhall Pass in 1880, before construction of roadways. The pass has changed greatly since then.

Newhall Pass in 1880, before construction of roadways. The pass has changed greatly since then.

Highway 99 was carved through the canyons in 1933, bypassing the 18-year-old Ridge Route that connected Los Angeles with Bakersfield. Highway 99 would be replaced in the mid-1960s by Interstate 5.

Highway 99 was carved through the canyons in 1933, bypassing the 18-year-old Ridge Route that connected Los Angeles with Bakersfield. Highway 99 would be replaced in the mid-1960s by Interstate 5.

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