National Park Service LogoU.S. Department of the InteriorNational Park ServiceNational Park Service
National Park Service: U.S. Department of the InteriorNational Park Service Arrowhead
 
 
Making America's Best Idea Even Better
City of Rocks National ReserveRanger guided Junior Ranger nature hike
view map
text size:largestlargernormal
printer friendly
City of Rocks National Reserve
Laws & Policies
 
Public Law 100-696, signed November 18, 1988, created City of Rocks National Reserve.
 
Public Law 101-512 permitted hunting within the Reserve.
 
Castle Rocks Acquisition Act of 2000
Twin Sisters granite spires against a summer sky.  

Did You Know?
The Twin Sisters in City of Rocks National Reserve are made up of different rocks. The darker sister is made of granite that is 2.5 billion years old and is some of the oldest rock in the Lower 48 states. The lighter sister is made of granite in a younger formation that is 25 million years old.

Disclaimer Accessibility Privacy Policy FOIA Notices USA.gov

Last Updated: September 12, 2007 at 11:28 EST