White Rock Canyon Trailhead is located in Lake Mead National Recreation Area, but south of Hoover Dam along Highway 93 on the Arizona side of the Colorado River, about 45 minutes southeast of Las Vegas.
From town, drive out towards Lake
Mead. Stay on Highway 93 and drive south over the bridge into Arizona. At about Mile Post 4 (Site 0745), watch for a left turn across the highway and a paved road leading to a large parking area (Site 1038) east of the highway. Park
here; this is the trailhead.
Use caution crossing the highway - oncoming traffic is traveling at 70 mph!
If you miss the turnoff, continue south on Highway 93 for about 6 miles to where you can make a U-turn.
Link to trailhead map.