Hidden below I-5 just north of Valencia Blvd next to a drainage basin, a bit of US 99 history remains in Santa Clarita, California. A culvert, dating to 1929, has survived through an expressway upgrade in 1949, freeway construction in 1967, bridge replacement construction in 2001, and current widening work in 2022. How much longer it will last is unknown but so far it has withstood the test of time.
The Ridge Route on US 99 between Castaic and Gorman was a very twisty roadway when it first opened. All told, there was about 39,600 degrees of curvature over the approximately 30-mile route, enough to go in 110 circles. The state gradually worked to alleviate this headache by straightening curves whenever possible. Some curves were merely daylighted where others were completely bypassed. In the case of the Callahan Line Change, as shown in the postcard above, the road was shifted to change eight sharp curves into one gentle curve. The work here was completed in 1926. In 1933, the roadway would by bypassed altogether by the Ridge Route Alternate.
A lot has changed in southern Orange County since 1959. Gone are most of the orange groves and wide-open spaces. Today, this view is very different but a surprising amount of what is seen does remain. This photo, taken in 1959, shows the US 101 freeway and the original alignment to the right, known as Camino Capistrano. In the intervening years, the roadway has been widened at least four times. Instead of a four-lane freeway, it is now eight lanes plus two HOV lanes. Even today, the roadway is being widened yet again, this time to add an additional HOV lane in each direction. The State 73 freeway interchange is also missing from this view. It would be added in 1996.
Some of the concrete visible in this photo on both the freeway and old alignment still remain to this day. It is truly amazing to see what things looked like before they became one giant suburban mess.
There is currently a fire, #RouteFire, burning on the Ridge Route near Templin Highway. I-5 is closed both directions and the Old Ridge Route may be in danger. For information, follow the Twitter feed for the Ridge Route Preservation Organization – @ridgeroute99.
Join the Historic Highway 99 Association of California for a presentation on the history of US 99 and the Newhall Pass on September 14, 2021 at 6pm via Zoom. The history of the roadway will be covered from the Newhall Tunnel in 1910 to the HOV ramp at the I-5 / State 14 interchange in 2012. Q&A to follow the presentation. Please register using the link below.
https://us06web.zoom.us/meeting/register/tZcrc–rpzIoGdxQYOYkViOpSZQHqw2rEpl1