History – Page 2 – California Highways: Route by Route

CA RxR 4.05: I-10: Santa Monica FreewayCA RxR 4.05: I-10: Santa Monica Freeway

January 7, 2026| Daniel| 0 Comment| 6:04 am

With Episode 4.05, we turn our attention to Route 10. This first episode on Route 10 starts with an exploration of the 10^th route (the last ordinal route we’ll do), which was the Emigrant Gap Highway, and became the basis for LRN 37. This became part of the Lincoln Highway, then US 40, and is now part of I-80 from Sacramento to Nevada. We look at LRN 10, which became Route 198 from US 101 near San Lucas to Sequoia National Park. We then explore Sign Route 10 (which we discussed in our episode on I-5 in Los Angeles county), which ran from US 101A to US 101, later becoming Route 42 and US 101 Bypass, and eventually I-105 and I-5. Lastly, we turn to post-1964 Route 10, which is today’s I-10. In this episode, we focus on the first segment: “From Route 1 in Santa Monica to Route 5 near Seventh Street in Los Angeles”, which is today’s Santa Monica Freeway. We look at its origins as Sign Route 6, which became Sign Route 26 along LRN 173, LRN 166, and LRN 171. We focus on LRN 173 (LRN 166 and LRN 171 were discussed in our episode on I-5 in Los Angeles county, as well as our episode on Route 6), which was Olympic Blvd. We explore the history of the Santa Monica Freeway segment, the experiments tried along this highway, some significant projects along this segment, and some significant names on this segment.

We will complete our exploration of Route 10 in Episode 4.06, which explores the San Bernardino Freeway: Its origins in LRN 26 and LRN 64 and the Ramona Airline. The history and strange intertwinings of the US highways that were signed on Route 10: US 60, US 70, and US 99. The transition to I-10 and the story of Route 10S. Lastly, we’ll cover projects and names on the segment.

Here’s the link to the show:

And here’s the link on Spotify for Creators:

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CA RxR 4.04: Route 9: Pre-1964 – Milpitas to Castro ValleyCA RxR 4.04: Route 9: Pre-1964 – Milpitas to Castro Valley

December 19, 2025| Daniel| 0 Comment| 7:02 am

Episode 4.04 is our second episode exploring Route 9, which in its post-1964 version runs from Santa Cruz to Saratoga and Los Gatos. Before 1964, Route 9 continued N up to the Mountain View area, and then across to Milpitas, and up to the Castro Valley. The previous episode covered post-1964 Route 9 (and the first segment of pre-1964 Sign Route 9) from Santa Cruz to Saratoga and then into Los Gatos, as well as all the 9^th State Route and LRN 9. This episode (4.04) covers the pre-1964 Route 9 portions N of Saratoga: Sign Route 9 through Mountain View, Milpitas, and up through Hayward and the Castro Valley. This portion of Sign Route 9 became Route 85, Route 237, Route 17/I-880/I-680 (in portions) and Route 238. The next pair of episodes will be covering I-10, with episode 4.05 covering the Santa Monica Freeway portion, and episode 4.06 covering the San Bernardino Freeway portion.

Here’s the link to the show:

And here’s the link on Spotify for Creators:

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CA RxR 4.03: Route 9: Santa Cruz and SaratogaCA RxR 4.03: Route 9: Santa Cruz and Saratoga

November 28, 2025| Daniel| 0 Comment| 5:50 am

Episode 4.03 starts a pair of episodes that explore Route 9, which in its post-1964 version runs from Santa Cruz to Saratoga and Los Gatos. Before 1964, Route 9 continued N up to the Mountain View area, and then across to Milpitas, and up to the Castro Valley. This episode (4.03) covers the current Route 9 from Santa Cruz to Los Gatos; the next episode (4.04) covers the remainder of pre-1964 Sign Route 9 through Mountain View, Milpitas, and up through Hayward and the Castro Valley. This episode also explores the 9^th State Route between Peanut and Kuntz (now Mad River), and LRN 9. LRN 9 ran all the way from Ventura to San Bernardino, and was Sign Route 118 from Ventura to Pasadena, and US 66 from Pasadena to San Bernardino. As always, we’ll talk about historical routings, projects along the route, and some significant names. As noted, the next episode explores the remainder of pre-1964 Sign Route 9 from Saratoga through Milpitas to the Castro Valley.

Here’s the link to the show:

And here’s the link on Spotify for Creators:

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CA RxR 4.02: I-8 and US 80 Between El Cajon and the Arizona BorderCA RxR 4.02: I-8 and US 80 Between El Cajon and the Arizona Border

November 7, 2025| Daniel| 0 Comment| 11:35 am

This is Episode 4.02, which continues our exploration of Route 8, better known as Interstate 8. In this episode, we focus on the portion of I-8 from La Mesa (just outside of San Diego) to the Arizona border. We look at not only current I-8, but the routing of the predecessor route, US 80. We discuss the communities of La Mesa and El Cajon, Alpine and Descanso, Boulevard, the Mountain Springs Grade, Jacumba, Ocatillo (with a digression on the Imperial Highway), El Centro, Holtville and the Algondenes Dunes (with a digression on the Plank Road), Winterhaven and Yuma. We also briefly talk about the interesting routing of US 80 within Arizona, and how it differs from I-8. We talk about historical routings, projects along the route, and some significant names. In the next episode, we’ll turn our attention to Route 9, which currently runs from Santa Cruz to Los Gatos, but which once ran all the way to Castro Valley.

Here’s the link to the show:

And here’s the link on Spotify for Creators:

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CA RxR 3.15: LA Metro Archives (Bonus)CA RxR 3.15: LA Metro Archives (Bonus)

September 22, 2025| Daniel| 0 Comment| 11:45 am

A New Year’s Gift for you: Our last Bonus Episode of Season 3. Episode 3.15 features an interview with Claire Kennedy, Archivist for the Los Angeles Metropolitan Transportation Agency (LA Metro). In this role, Claire manages the LA Metro Archives, which date back to the 1800s and the earliest horse-drawn transportation in the city. These archives cover not only the wide variety of transit agencies in Los Angeles, but also the highway and road system as Metro is the Regional Transportation Agency. These archives are a public resource, and are open by appointment; information on how to make an appointment is in the podcast (and below). Note that we had some trouble with Zencastr this episode; we fell back to FreeConferenceCall.com. We’ll pick up in the October with Season 4, which will cover Route 8 through Route 14.

Here’s the link to the show:

And here’s the link on Spotify for Creators:

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CA RxR 3.13: Fresno Flats (Bonus)CA RxR 3.13: Fresno Flats (Bonus)

July 18, 2025| Daniel| 0 Comment| 8:09 pm

Episode 3.13 is our first bonus episode, bridging the gap while we write Season 4. This bonus episode is a presentation that our co-host, Tom Fearer, gave at the Fresno Flats museum back in May 2025. The presentation focuses on the highways of the Oakhurst area, and was described as: “Since the establishment of the Stockton-Los Angeles Road in 1853 the Sierra Nevada foothills of what is now Madera County has been a hub of highway development. Much of the existing infrastructure in the area was established by the late 1880s with the plotting of the Fresno-Fresno Flats Road and Yosemite Stage Road. The area was of great interest during the early State Highway era due to the desirable access it could provide for logging interests and automotive based recreational travel to Yosemite National Park. Even Minaret Summit was briefly considered for a proposed extension of Interstate 70 into California before the era of environmental impact assessment began.” We’ll pick up in the fall with Season 4, which will cover Route 8 through Route 14. I’m also looking into better software for recording the podcast: In particular, does anyone have opinions on Zencaster, Riverside, or Squadcast?

Here’s the link to the show:

And here’s the link on Spotify for Creators:

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CA RxR 3.12: Route 7: From Long Beach to the BorderCA RxR 3.12: Route 7: From Long Beach to the Border

June 22, 2025| Daniel| 0 Comment| 1:18 pm

Episode 3.12 brings Season 3 to a close, modulo our bonus episodes. In Episode 3.12, we explore all things Route 7. As is our tradition, we start by looking into the 7^th state highway, the Kings River Canyon Road, and LRN 7, which included portions of US 40 and US 99W. We then turn our attention to various incarnations of Route 7: Sign Route 7, both the section along the Eastern Sierras that is now US 395 and US 6 and the section that became Sepulveda Blvd in Los Angeles; 1964-1981 Route 7, which was the Long Beach Freeway before it was renumbered into I-710; and the current Route 7, which is a small border connection route near a new entry point near Calexico. We’ll then be taking a short break, during which there will be some bonus episodes. We’ll pick up in the fall with Season 4, which will cover Route 8 through Route 14. I’m also going to be working on improving the sound quality of the podcast once I retire in July.

Here’s the link to the show:

And here’s the link on Spotify for Creators:

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CA RxR 3.09: I-5: Former US 99WCA RxR 3.09: I-5: Former US 99W

April 6, 2025| Daniel| 0 Comment| 12:25 pm

Episode 3.09 continues our exploration of I-5 with the segment from Sacramento to Red Bluff, which primarily incorporates the former LRN 7 / US 99W routing between Woodland and Red Bluff, and a new routing that roughly followed LRN 238, then LRN 50 and LRN 232 between Sacramento and Woodland (near former Sign Route 16 and Sign Route 24). We talk about this history of this segment, as well as some discussion of historical routings in Natomas, Woodland, Williams, Willows, Corning, and Red Bluff. Our exploration of I-5 finishes in Episode 3.10, where we explore the former LRN 3/US 99 segment between Red Bluff and the Oregon Border.

Here’s the link to the show:

And here’s the link on Spotify for Creators:

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CA RxR 3.07: I-5: The Central ValleyCA RxR 3.07: I-5: The Central Valley

February 9, 2025| Daniel| 0 Comment| 11:00 am

Next up in our exploration of I-5: the segment between the I-5 / Route 99 split and where I-5 meets former US 99W (now Route 113) in Woodland. Generally known as the “Westside Highway”, this was mostly a completely new routing for I-5 along LRN 238, although some portions paralleled former US 50 between Stockton and Sacramento, and Sign Route 16 between Sacramento and near Route 113 in Woodland/Yolo. As usual, we cover the history of the route, naming, and projects. Subsequent episodes will be looking at (3.08) the planned I-5W; (3.09) the former US 99W portion from Sacramento to Redding; and (3.09) the portion from Redding to the Oregon Border.

Here’s the link to the show:

And here’s the link on Spotify for Creators:

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CA RxR 3.06p2: I-5: Whatever Became of the Ridge Route? (Part 2)CA RxR 3.06p2: I-5: Whatever Became of the Ridge Route? (Part 2)

January 26, 2025| Daniel| 0 Comment| 1:00 am

Our I-5 exploration continues, with a focus on the segment of I-5 from the US 101 split in Downtown Los Angeles to the Route 99 split in Wheeler Ridge. This episode, Part 2 of 3.06, completes the history from Part 1 with a detailed dive into the history of the Ridge Route. After that, we discuss major projects in this segment of I-5, as well as historical and memorial names. This includes our second deep dive into the history of the “Grapevine” name. Our special guest this episode is Sydney Croasmun of the Ridge Route Preservation Organization. Sydney brings her expertise our Ridge Route discussion, and also discusses the goals and activities of the RRPO. Subsequent episodes will be looking at (3.07) the Westerly Routing; (3.08) the planned I-5W; (3.09) the former US 99W portion from Sacramento to Redding; and (3.09) the portion from Redding to the Oregon Border.

Here’s the link to the show:

And here’s the link on Spotify for Creators (Spotify changed names yet again):

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