Category Archives: I-5

From the Archives – 1956

Looking south toward Mission Bay. Courtesy – Caltrans

The first section of the San Diego Freeway in San Diego (US 101 at the time) to be constructed was the Mission Bay Bypass in 1954. Elements of this construction can still be seen today, such as some older curbing at the intersection of Damon Ave and Santa Fe St. North and south of this small section of freeway, it was still a narrower four-lane roadway with some expressway sections. Between 1966 (north) and 1969 (south), the adjacent sections were constructed, completing I-5 in the City of San Diego.

Featured Image – 12/23/2019

1932/34 concrete at the divergence of the lanes at Grapevine.

Here at Grapevine, a small section of concrete is visible adjacent to the southbound lanes of I-5. This is a section of former US 99. A small color difference can be noticed between the two lanes that are visible. This difference is due to age. The lanes to the left were constructed in 1932 when Grapevine Grade was realigned, bypassing the original 1914 Ridge Route grade. This was built as two lanes as a temporary measure to expedite the opening of the new route. Right after it was opened, a third lane was added, the lane on the right, creating a three-lane roadway with a common passing lane in the center, or “suicide lane”. This condition persisted until 1943 when the road was widened yet again to four lanes. In 1959 – 1960, these lanes were bypassed by the current southbound lanes of I-5. Today, they remain as one of the last remnants of the 1932-1959 version of Grapevine Grade.

The Grapevine?

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Current Roadway Conditions and Detours

I-5 between Santa Clarita and the San Joaquin Valley is commonly referred to as “The Grapevine” by locals and traffic reporters. Most assume the name derives from the twisty nature of the original roadway – the Ridge Route. That road was indeed very twisty, much like a grapevine. However, that is still not the reason. The name Grapevine actually comes from Grapevine Canyon, where old US 99 and I-5 come down from the mountains and into the San Joaquin Valley. The canyon is called such as wild grapes grow along the canyon walls. It was formerly known as Canada De Las Uvas which is Spanish for Canyon of the Grapes. The name Tejon Pass is also a “new” addition to the area. The current Tejon Pass was known as Grapevine Pass or Badger Pass until the 1850’s. Old Tejon Pass, much farther to the east, was a very treacherous route. That pass was eventually abandoned in favor of the current Tejon Pass. The name was just shifted to the new route.

After the 1933 bypass of the original road to as late as the 1970’s, the roadway over the mountains was still referred to as “The Ridge Route”. It wasn’t until the 1980’s that the name “The Grapevine” was extended to the entire roadway. Why this was done is still unclear. Even Caltrans called it the “Ridge Route” when I-5 was completed. So, if you want to call it proper – call it Tejon Pass, when being specific to the actual pass, and the Ridge Route when referring to I-5 from Castaic to Grapevine. While you’re passing through Grapevine Canyon, be sure to spot the wild grapevines that still grow in the canyon. Names may change, but the name Ridge Route should live on. It applies to I-5 better than “The Grapevine” ever will.

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Adopt-A-Highway Cleanup

Well, it has been a while but I finally made it back up to Grapevine Canyon for a more formal cleanup. I, and two others, cleaned up the upper and lower water stops along I-5 in Grapevine Canyon on Saturday, June 29, 2019. We filled nine bags and found many interesting items including a printer/copier. Next cleanup should be in early September most likely.

Lower water stop – four bags
Upper water stop – five bags and a lot of debris

Featured Image – 12/11/2018

Original paving in Grapevine Canyon

This is a section of abandoned roadway, paved in 1919, within Grapevine Canyon, near PM 8.0 on the east side of the canyon. This section was bypassed in 1933 by a newer alignment of US 99.