US Route 101 through Templeton of San Luis Obispo County, California was once carried through the community via Main Street. Templeton was host to an early bypass realignment which saw US Route 101 moved to it's present grade as an expressway in 1953. US Route 101 is depicted below on the 1935 Division of Highways Map of San Luis Obispo County when it was aligned on Main Street.
Part 1; the history of US Route 101 in Templeton
Templeton traces it's origins to 1886 when land on what had been Rancho de Paso Robles was purchased by the West Coast Land Company. The West Coast Land Company sought to establish a town site and siding on the Southern Pacific Railroad south of nearby Paso Robles. This community was intended to be called "Crocker" in honor to Southern Pacific Railroad President Charles F. Crocker. Ultimately Charles F. Crocker requested the community be named "Templeton" in reference to his son. Templeton can be seen on the 1890 George F. Cram Railroad Map of California alongside the Southern Pacific Railroad.
Templeton was ultimately part of the American El Camino Real which began being signed as an Auto Trail starting in 1906. The era of State Highway Maintenance through Templeton would begin with the 1909 First State Highway Bond Act which was approved by voters in 1910. One of the highways approved through the 1909 First State Highway Bond Act was a 481.8 mile highway originating at the City Limits of San Francisco which terminated in San Diego. This highway would ultimately come to be known in time as Legislative Route Number 2 ("LRN 2"). In 1913 the Pacific Highway was plotted as a major Auto Trail which had Templeton along it's planned route.
The 1920 Rand McNally Highway Map of California shows El Camino Real and the Pacific Highway following LRN 2 through Templeton.
The 1924 Rand McNally Map of California shows the California Banff Bee-Line Highway co-signed with the Pacific Highway on LRN 2 through Templeton.
The December 1927 California Highways & Public Works notes four hazardous curves between Templeton and Paso Robles had recently been straightened.
As noted in the intro; US 101/LRN 2 is depicted on the 1935 Division of Highways Map of San Luis Obispo County on Main Street in Templeton.
The May/June 1952 California Highways & Public Works notes US 101/LRN 2 had been converted to four lanes between Atascadero and Templeton by July 1951. This four lane segment is noted to be a component of a larger divided highway project which was planned to extend through Templeton to Paso Robles.
The new alignment of US 466 multiplexing CA 41/LRN 33 west of Shandon and US 101/LRN 2 south of Paso Robles through Templeton is depicted on the 1959 Division of Highways Map.