What did the Coachella Valley, the city of Coachella in particular, look like in the 1910s? I'm wondering, in particular, what the major roads were. And, this is probably a futile question, but are there any maps of the city, or the valley in general, from this time period (or the '20s)?

I have a story I'm working on that takes place in Coachella, that happens to be in an alternate history timeline with a point of divergence during WWI. Coachella, in the timeline, reaches a population of a couple hundred thousand by the 2030s, when the story takes place (in part because the aircraft industry moved there from Burbank, though I'm not sure how plausible that'd be). I know I can probably just make stuff up, but I don't want to -- I mean, I know there would be radical changes over 100 years, but the main boulevards would probably remain the same. Anyways...

Thanks.