After 20 miles along the PCT this is the next water source after N. Fork San Jacinto River. You should treat the water. There are some flat spots to pitch your tent, but there is few to no shade.
This is the end of section B and beginning of section C if you hike the Pacific Crest Trail northbound. You will also enter the Mesa Wind Farm area at this point in Cottonwood Canyon.
This is one of many Pacific Crest Trail (PCT) Markers showing hikers the emblem of the 2653 mile trail, going from the border of Mexico to the border of Canada.