The Tonto National Forest's Tortilla Campground, near Canyon Lake in the Mesa Ranger District, has been closed indefinitely due to problems maintaining the site's water treatment facilities.
Fees will be waived at a number of day-use sites for the holiday.
Officials are asking the public for tips in the vandalism of four crosses at Oak Flat Campground.
Even with multiple heat-related rescue calls this summer, Parks and Recreation says hikers can keep hiking.
Parts of the Tonto and Coconino National Forests close today due to extreme fire risk.
Campfires and smoking are again allowed on forest lands as of Monday.