In Sloan Canyon National Conservation Area, petroglyphs are concentrated in the Petroglyph Canyon gallery about 1.8 miles south of the Sloan Canyon Trailhead. The area is most easily accessed using the BLM 100 Trail (Petroglyph Canyon Trail) from the Sloan Canyon Trailhead, but this trail requires some minimal 3rd-class scrambling.
Other trails and trailheads can be used (e.g., BLM 300 Trail), but for people simply wishing to avoid the scrambling, the BLM 200 Trail provides a bypass that is a bit longer but requires no scrambling.
When visiting petroglyph sites, exercise the utmost in care to protect the artwork for your children and grandchildren. Don't touch the artwork because hand-oils damage them. Report vandalism to the BLM (Sloan Canyon National Conservation Area) or just call 911.