Love the water forging over sand. The box canyon is beautiful! Be cautious, depending on the season the water can get deep. Recommend traveling with another vehicle during high water seasons. I've pulled out multiple 2wd pick-ups. There is a fun little sand camping spot up the canyon with a small slit canyon to take pics.
To get here, start in Wickenburg and proceed north on US-93. Take a right onto Scenic Loop Road, about a mile north of the stoplight at Vulture Mine Road, and follow the road about 7.4 miles--there is a pullout and parking area on the right. There is no signage; you can either walk down into the canyon from here or drive down with a 4wd. The "loop" is actually much more confusing than it's worth; most people go up the canyon or down the canyon, and retrace and exit where you came in. The box canyon that gives the area its name is on the right, just a couple hundred yards downriver. This is one of the few places you will actually see surface water on the Hassayampa, and it is a nice area as long as it's not too crowded.