I came across this web page in the Caltrans site. It has links to detailed Caltrans maps that show the maintenance facilities of every district. Larger districts are split up into regions and the boundaries of those regions are shown. I had previously run across a few of these maps, but finding the comprehensive list is fortunate as my book had a lot of holes. It is now complete. I hope theses are of use to some people.
Thanks , the maps are also great to show you where CHP fill with gas. The desert center is the farthest beat for both Indio and Blythe station. I imagine the resident CHP officer in illdywild fills up at keenwild office too.
You be steppin....I be stomping.