Yes, you're on the AZ side, no matter what the map tells you...
That is, if you're on the Flying J side of the bridge.
If you're where I think you are, you've gone past the Flying J and hung a left between the truck wash/repair and a deserted building and kept on going straight down that road until you found a campsite.
If you want closer to the highway here's the directions:
Just past the gas compressing station on that road is a road off to the west (towards the river). It looks like you're driving on private property between two farm fields but the 'private property signs are for the fields only, not the road. Follow it to the end where you can see the boat ramp on your left and then turn left. The canal road dead ends about a mile and a half downstream and there's some nice camp spots in there including one at the very end that's really nice.
Cell signal might still be a problem...t mobile is known for not having decent coverage outside of the major cities. Verizon signal was usually good although some days we had to walk up on to the road itself to do calls, internet and text were okay in camp.
Laundromat has showers...buy tickets and share the cost.