Calimesa is a city located in Riverside County near the outskirts of San Gorgonio Pass. When the US Route System was created during November 1926 only US Route 99 was aligned through the community via what is now Calimesa Boulevard along with parts Copper Drive and Roberts Road. US Route 99 was joined through Calimesa by US Route 70 in 1935. US Route 99-70 would move to a new expressway alignment during 1951 onto a grade which would eventually become Interstate 10. Featured as the cover of this blog is former US Route 99-70 in Calimesa on Roberts Road in Calimesa.
https://www.gribblenation.org/2022/04/former-us-route-99-70-in-calimesa.html?m=1