How Can 10 Million Gallons of Water a Year Suddenly Appear in a Stony Desert?

Historical marker location:

406 North Pipe Spring Road, Fredonia, Arizona

( Marker can be reached from North Pipe Spring Road, 0.3 miles north of Arizona Route 389, on the left when traveling north.)

Pipe Spring National Monument.

Before becoming a US territory in 1848, Arizona was part of Mexico. The Mexican government established the region as part of the state of Sonora, but it later became its own separate territory.