I've mentioned that AZ has something called the Stupid Motorists Law. It essentially says that if you get yourself into a flooded stream/wash/etc., you get to pay for your own rescue.
This blog has some of the shots of the flood I've seen repeated a few times (no guarantee of any other content, folks). The "Arizona Freeway" one is the Interstate 17 (aka "I-17") freeway and 35th avenue. From where I work, that's about 5 miles north. The one from 43rd Ave and the I-17 is about 5 miles west of here. The largest area of 4" or so deep water I went through, and the 3" of water draining off the freeway. There are no washes or rivers near me. I take one long main street to the freeway then take the freeway into work, so no real problems. If I was in the middle of the desert, I wouldn't have bothered. My friend that DOES live in the middle of the desert came in, too, tho. Both of us have little Japanese cars.
This article has pics of Stapley and the US 60 (a 8-lane freeway). I live maybe two or three miles north and three or four miles east of that. I do note that the pic is of a rather new area. There's an awful lot of "new" out here, but my neighborhood was built in the early-to-mid 1970s. We also have irrigation canals on the main street a 1/4 mile west of us. That probably helped a lot.
By the time I came home, yesterday. almost all the water not in a deep depression had evaporated (I was watching a weather station: it went from 98% humidity to 85% in an hour. Our all-time low is about 3%). We did get some rain last night, but not much. Supposed to be a bit more in the next couple days. The rainfall we got in Mesa is almost double the amount expected for the entire monsoon season. Phoenix had a bit more than what's expected for the entire season (final tally of 3.29"). Wealtherunderground.com reports that the city to the south and west of me, Chandler, got 6.09" in one area.
We've had a drought in this part of AZ for 15-20 years, so extra water is always appreciated. Sorry that I can't help the folks in CA.