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Write to
Grand Canyon National Park
P.O. Box 129
Grand Canyon, AZ 86023
Phone Numbers
General Visitor Information: (928) 638-7888
Backcountry Information Center: (928) 638-7875 between 1 pm and 5 pm Monday through Friday, except on federal holidays
River Permits Office: (800) 959-9164 or (928) 638-7843
Fax Numbers
Main Fax Number: (928) 638-7797
Backcountry Information Center: (928) 638-2125
River Permit Office: (928) 638-7844
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Did You Know?
The Cambrian seas of the Grand Canyon were home to several kinds of trilobite, whose closest living relative is the modern horsehoe crab. They left their fossil record in the mud of the Bright Angel Shale over 500 million years ago.