The James Dean Memorial Junction interchange structure opened during June 2025 as a grade separation between California State Routes 41 and 46 in Cholame Valley. This interchange structure is located a short distance eastward from the infamous 1955 crash site which took the life of actor and racecar driver James Dean. The crash site was once a Y-junction between US Route 466 and California State Route 41 which was reconfigured in 1959. This blog will examine the history of the highway junction in Cholame Valley from stage route times through the US Route 466-era and into construction period of the current interchange.
Part 1; the history of James Dean Memorial Junction
James Dean Memorial Junction is located in Cholame Valley of eastern San Luis Obispo County. Long before the existence of the State Highway System this valley has served as the junction for the highways crossing Polonio Pass and Cottonwood Pass in the Temblor Range. The so-called Lemoore Road departed Cholame Valley heading northeast over Cottonwood Pass towards the shores of Tulare Lake. The Polinio Pass Road departed the area eastward towards the outskirts of Bakersfield.
The junction of the Lemoore Road and Polonio Pass Road (marked via blue pin) can be seen east of Cholame on the 1915 United States Geological Survey map.
"An extension connecting the San Joaquin valley trunk line (Legislative Route Number 4) at or near Bakersfield with the coast trunk line (Legislative Route Number 2) in San Luis Obispo county, through Cholame Pass (Polonio Pass), by the most direct and practical route."
The Polonio Pass Road appears listed as a Second State Highway Bond Act corridor in the July 1916 California Highway Bulletin. The Polonio Pass Road would typically be referred to as the "Cholame Lateral" in state documents into modern times.
The Polonio Pass Road appears as Legislative Route Number 33 on the 1918 California Highway Commission map. The corridor is displayed under the map legend as "proposed."
1933 Legislative Chapter 767 defined Legislative Route Number 125 as a then new State Highway between Morro Bay and the southern boundary of Yosemite National Park. Legislative Route Number 125 ran northeast from Morro Bay and met Legislative Route Number 33 and the Cholame Lateral in Shandon. Legislative Route Number 125 departed northeast in Cholame Valley northeast via Cottonwood Pass towards Lemoore and Fresno.
During June 1933 the California Division of Highways petitioned the American Association of State Highway Officials (then AASHO, now AASHTO) for an extension of US Route 64 west of Raton, New Mexico to Morro Bay, California. The extension of US Route 64 was not considered ideal by AASHO due to proposed routing including a lengthy multiplex of US Route 66 from Santa Fe, New Mexico to Barstow, California.
Within California, US Route 64 as proposed would have split from US Route 66 in Bartow and followed Legislative Route Number 58 west over Tehachapi Pass to Bakersfield. From Bakersfield, proposed US Route 64 would follow US Route 99 north along Legislative Route Number 4 to Famoso. From Famoso, proposed US Route 64 would follow Legislative Route Number 33 west over the Poloino Pass to Cholame. From Cholame, proposed US Route 64 was to follow Legislative Route Number 125 to Morro Bay by way of Shandon, Creston, Rocky Canyon and Atascadero.
An alternate proposed routing of US Route 64 in New Mexico did little to mitigate the lengthy multiplex of US Route 66 in Arizona and California. The alternate proposed routing for US Route 64 diverged from US Route 66 in Albuquerque southward multiplexed along US Route 85 to San Antonio. From San Antonio the proposed alternate corridor of US Route 64 multiplexed US Route 60 to Springerville, Arizona and would replace US Route 260 west to Holbrook. The alternate routing of US Route 64 did not resolve the multiplex along US Route 66 from Holbrook west to Barstow, California. Ultimately, the proposal to extended US Route 64 was to be reviewed by the AASHO Executive Committee during their October 1933 meeting.
During their August 1933 meeting AASHO suggested US Route 466 to the California Division of Highways as an alternative to the lengthy extension of US Route 64. US Route 466 was initially proposed as originating in Barstow, California and terminating at Morro Bay. The Division of Highways via telegram to AASHO dated August 10, 1933, expressed that such a short US Route located entirely in-state would not provide the same utility as their US Route 64 extension proposal.
During the October 1933 AASHO meeting a compromise was reached which brought US Route 466 into existence. US Route 466 would begin at US Route 66 in Kingman, Arizona and travel northwest to the site of Boulder Dam at the Nevada state line. Within in California, US Route 466 would retain the same Barstow-Morro Bay (by way of Polonio Pass) alignment desired by the California Division of Highways for their US Route 64 extension proposal.
The first description of US Route 466 in Nevada is a letter dated November 14, 1933. In said letter the Nevada State Highway Engineer describes the routing of US Route 466 to the AASHO Executive Secretary. The origin point of US Route 466 is stated to be from the site of Boulder Dam westerly via Nevada State Route 26 and Nevada State Route 5 to Las Vegas. From Las Vegas, US Route 466 multiplexed US Route 91 along Nevada State Route 8 to the California state line at Primm. US Route 466 would continue to multiplex US Route 91 along Legislative Route Number 31 in California to Barstow where it would branch off towards Morro Bay.
California State Route 41 was announced as one of the original Sign State Routes in the August 1934 California Highways & Public Works. California State Route 41 entered Cholame Valley along Legislative Route Number 125 via Cottonwood Pass. California State Route 41 initially multiplexed US Route 466 from the Y-junction in Cholame Valley west to Shandon. From Shandon California State Route 41 would continue westward on Legislative Route Number 33 to Paso Robles and Cambria.
The junction of US Route 466 and California State Route 41 in Cholame Valley can be seen on the 1935 Gousha Highway map of California.
The Y-junction of US Route 466 and California State Route 41 in Cholame Valley can be seen in greater detail on the 1935 Division of Highways map of San Luis Obispo County.
California State Route 41 was straightened over Cottonwood Pass during 1941. The modernization of the corridor made it far more practical way for San Joaquin Valley traffic to reach the coast of San Luis Obispo. The improved routing over Cottonwood Pass opened on September 2, 1941, and was featured in the September 1941 California Highways & Public Works. The article noted traffic had previously preferred using Kecks Road and crossing to Cholame Valley on US Route 466 over Polonio Pass.
The 1943 United States Geological Survey map of Cholame displays the Y-junction of US Route 466 and California State Route 41 in substantial detail. The Y-junction was located a short distance east of Cholame Valley Road.
The Y-junction of US Route 466 and California State Route 41 was the site of a fatal crash which claimed the life of actor James Dean on September 30, 1955. Dean was increasingly becoming involved with motorsports and had purchased a Porsche 550 Spyder nicknamed the "Little Bastard" on September 21, 1955. Dean was inexperienced with his Porsche 550 and elected to drive it up from Los Angeles to the Salinas Road Racing event scheduled for October 1st and 2nd.
Dean drove the Little Bastard north from Los Angeles with Porsche mechanic Rudolf Karl "Rolf" Wütherich as a passenger. The pair headed into San Joaquin Valley via US Route 99 and then west on California State Route 166. Dean elected to branch off at California State Route 166 to avoid Bakersfield traffic and followed it Maricopa. From Maricopa his routing turned north on California State Route 33 towards US Route 466. Dean stopped at Blackwell's Corner at the junction of US Route 466 and California State Route 33 where the last photo of him alive was taken (Sanford Roth collection). Dean's Ford Country Squire Wagon which was used to tow his racecars can be seen in the background.
Dean suffered a broken neck and severe internal/external injuries from the crash. Wütherich was thrown from the Little Bastard on impact and was knocked unconscious. Dean was pronounced dead on arrival at the Emergency Room of Paso Robles Memorial Hospital. Wütherich suffered a broken jaw and numerous femur injuries which were necessary to repair surgically. Turnupseed sustained only minor facial injuries from the crash.
The San Luis Obispo County Sheriff's Office coroner called for an official inquest into the fatal crash in Cholame Valley on October 11, 1955. Turnupseed testified that he didn't see Dean's Little Bastard while attempting to turn onto northbound California State Route 41. Following additional testimony by witnesses and California Highway Patrol officers the coroner's inquest jury came back with a verdict of no criminal culpability by Turnupseed in the death of James Dean.
The May/June 1957 California Highways & Public Works announced a new expressway grade for California State Route 41 east of Paso Robles to the Estrella River was in the process of being constructed.
The July/August 1957 California Highways & Public Works announced the upcoming realignment of US Route 101 on the Paso Robles Bypass. The Paso Robles Bypass Project is stated to be 5.1 miles in length which would tie into the existing divided highway segments on both ends of the city. The Paso Robles Bypass Project included a tie-in with the recently completed realignment of California State Route 41 from Huerhuero Creek east to the Estrella River. Upon being bypassed the road to the 1910 Estrella River Bridge came to be known as "River Grove Road."
During June of 1958 the Division of Highways sought and obtained permission to relocate US Route 466 off of Legislative Route Number 125 between Atascadero and Shandon. The Division of Highways noted that California State Route 41/Legislative Route Number 33 between Paso Robles-Shandon had recently been improved and was by far the favored highway for traffic. Legislative Route Number 125 between Atascadero-Shandon is noted to be substandard in design and despite being part of US Route 466 since 1933 was never signed as such. US Route 101 through Paso Robles is noted to be in the process of going through a freeway upgrade. The new alignment of US Route 466 would see it briefly multiplex California State Route 41 west of Shandon to Paso Robles via 24th Street and US Route 101 south to Atascadero via Spring Street.
The September/October 1958 California Highways & Public Works announced three project zones for US Route 466/California State Route 41 from the Estrella River eastward of Shandon to Palo Prieto Road (now Bitterwater Road). The ultimate aim was to extend the expressway corridor to Cholame Valley and bypass Shandon.
Improvements to US Route 466 over Polino Pass began to manifest in 1959. The September/October 1959 California Highways & Public Works announced a realignment project for US Route 466 was underway. The project corridor originated at the existing Y-junction with California State Route 41 in Cholame Valley and extended east to the Kern County line near Polonio Pass.
The improved Cholame Lateral between the Estrella River and Poloino Pass was featured in the May/June 1960 California Highways & Public Works. US Route 466/California State Route 41 were noted to now bypass Shandon. The Cholame Valley Y-junction where James Dean was killed was altered to softened (third photo below) the turnoff for northbound California State Route 41 towards Cottonwood Pass. US Route 466 over Polonio Pass was relocated to a straightened alignment whereas the original so-called Antelope Grade was abandoned. The Shandon Bypass was accepted by the Division of Highways on November 6, 1959, whereas the improvements to Polino Pass were complete during August 1959.
As part of the 1964 State Highway Renumbering US Route 466 was truncated to Baker. California State Route 46 was assigned to a new corridor from Famoso west to Cambria. California State Route 41 was rerouted away from Cambria to a new terminus in Morro Bay by way of Creston and Atascadero.
In 1977 the James Dean Memorial was erected in Cholame. The memorial is a stainless-steel sculpture growing around an ailanthus tree. The memorial is located next to where the Cholame Post Office once stood. Another more informal memorial has consistently existed at the actual crash site where the Y-junction of US Route 466 and California State Route 41 was altered in 1959.
The junction of California State Route 41 and California State Route 46 was named James Dean Memorial Junction on August 15, 2002, by way of Senate Concurrent Resolution 52, Chapter 107. Private donations paid for memorial signage which could be seen from California State Route 46.
In May 2017 following a fatal accident at the junction of California State Route 41 and California State Route 46 Bakersfield.com reported San Luis Obispo County was seeking funding methods to build a grade separation. During March 2018 the California Transportation Commission would award $197 million to widen California State Route 46/California State Route 41 to a four-lane expressway in Cholame Valley along with construction of a grade separation. The California Transportation Commission would make a formal alignment adoption during October 2020 following the corridor Final Environmental Impact Report being completed.
Construction of the California State Route 41/California State Route 46 grade separation broke ground during April 2023. During January 2024 traffic between Cholame and the interchange structure was shifted onto the new eastbound lanes of California State Route 46. The interchange structure was formally opened by Caltrans on June 12, 2025.
The California State Route 41/California State Route 46 interchange dedication can be seen below (Paso Robles Daily News). The ceremony was presided over by Caltrans District 5 Director Scott Eades.
While the California State Route 41/California State Route 46 interchange is functional the four-lane expressway around it is not. The four-lane expressway corridor currently under construction will extend from the Shandon Rest Area eastward over the Antelope Grade and Polonio Pass. This corridor is currently scheduled for completion during Spring 2027.
Part 2; the James Dean Memorial
These photos of the James Dean Memorial at Cholame during February 2017 by Gribblenation's Tom. The highway shot seen in the second photo below at the time was westbound California State Route 46 and southbound California State Route 46. The road segment now appears as Old State Route 46 on mapping services.
Part 3; a look back at James Dean Memorial Junction before the interchange conversion
These photos from April 2019 depict a journey along northbound California State Route 41/eastbound California State Roure 46 approaching James Dean Memorial Junction. The actual crash site of James Dean in 1955 can be seen on the left in the fourth photo roughly where the "do not enter" signs are located. A James Dean Memorial Junction placard can be seen in the fifth photo.
James Dean Memorial Junction can be seen below from Southbound California State Route 41 during January 2020.
These photos are from southbound California State Route 41 approaching the James Dean Memorial Junction interchange during December 2025. Traffic heading west onto California State Route 46 oddly is greeted with a gantry mistake which signs it as multiplex with US Route 101 instead of "To US Route 101." The interchange formally has no memorial name assigned.
This photo from December 2025 faces north on Cholame Valley Road at the incomplete westbound California State Route 46 overpass.
These photos (also from December 2025) are from eastbound California State Route 46 approaching the James Dean Memorial Junction interchange. Presently only California State Route 41 is signed on the interchange gantry whereas California State Route 46 is directed to follow orange construction signage.
The fully functional four lane expressway on eastbound California State Route 46 approaching the James Dean Memorial Interchange can be seen below during late May 2026.
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