It isn't hard to cross the wash and scramble up the sandstone on the other side to get a closer look. I only went far enough to get a good view and didn't try to get under the opening. There are also good views from this area back to the south toward the Blue Mountains.
This area is part of the Cameo Cliffs BLM area. There is an extensive system of ATV Trails in the area. Good maps are available at the staging area. Look for the highway sign for Steen Road and ATV trailhead.