US 99 – Three Mile Grade

Virtual Tour of Old US 99

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Three Mile Grade

Three Mile Grade at the Oak Flat Ranger Station.
Three Mile Grade at the Oak Flat Ranger Station.

The Oak Flat Ranger Station has been a stop along this highway for a long time. Here, campgrounds and water are available for use to the public. This is about half way down Three Mile Grade. As a side note, Oak Flat was formed when a large portion of the mountain above slid down.

View of Three Mile Grade and I-5 from the Ridge Route.
View of Three Mile Grade and I-5 from the Ridge Route.
Three Mile Grade in 1970. Note the still intact four lane striping and original divider. Photo Courtesy- Gordon Glattenberg
Three Mile Grade in 1970. Note the still intact four lane striping and original divider. Photo Courtesy- Gordon Glattenberg
Looking south along Three Mile Grade near the bottom.
Looking south along Three Mile Grade near the bottom.
Three Mile Grade in 1958, looking south toward Castaic above Piru Gorge.
Three Mile Grade in 1958, looking south toward Castaic above Piru Gorge.

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