California State Route 229 is a 9 mile State Highway entirely contained to San Luis Obispo County. California State Route 229 begins at California State Route 58 near the Salinas River and terminates at California State Route 41 near Creston. California State Route 229 is notable due to having a 6 mile long one-lane section and one of the lowest traffic counts in the State Highway System. The northern 3 miles of California State Route 229 from Rocky Canyon Road to California State Route 41 is largely aligned over what was US Route 466. The entirety of California State Route 229 is signed on Webster Road.
Part 1; the history of California State Route 229
What is now California State Route 229 ("CA 229") entered the State Highway System as part of Legislative Route Number 125 ("LRN 125") and Legislative Route Number 137. Both LRN 125 and LRN 137 were adopted into the State Highway System as part of 1933 Legislative Chapter 767 with the following definitions:
US 466 begins to appear on commercial highway maps of California beginning in 1935. US 466 is seen on the 1935 Gousha Highway Map of California multiplexing CA 41 into Shandon and splitting southwest towards Creston on an unpaved LRN 125. US 466 can seen traversing southwest from Creston via Rocky Canyon to Atascadero and terminating at CA 1 in Morro Bay.
Part 2; a drive on California State Route 229
Modern CA 58 east from Pozo Road to CA 229 was once part of LRN 137. As CA 58 eastbound approaches CA 229 it passes by it's former alignment over the 1914 Salinas River Bridge. The 1914 Salinas River Bridge was replaced in 1997 by a new span located to the north on CA 58.
CA 58 east of the Salinas River intersects CA 229.
CA 229 northbound has an advisory sign denoting the first 6 miles of the highway as being narrow given it is one-lane. During 2017 I encountered a Caltrans maintenance crew preforming tree trimming operations on CA 229. One of the workers informed me that they were seeing only 3 cars a day on the one-lane segment of CA 229.