The view from my campsite. Please ignore the power lines spoiling the shot.
"Rafter Take-out" is not drive-thru service for roofing supplies
There are a series of river access points, one where rafters, kayakers and such can exit the water before tumbling over the dam. Besides the paved roads to the access points, there are dirt roads (tire tracks, actually) running across the bluff to de facto campsites among the brush and cacti. I got an excellent spot, no one around, with three bars of 4G cell service. Sweet. I imagine the area is more crowded during rafting season.
There's also space to camp downstream of the H-Z Wash river access point, to the left of the dam and boat ramp. It's mostly river rock, though, and it's susceptible to flooding. But very handy for boaters.
It's all water over the dam, Dude