Cottonwood Trails Closed
Trail access remains closed to Cottonwood Spring Oasis, Lost Palms Oasis, and Mastodon Peak. More »
Pinto Basin Road Under Construction; Expect 30+ Minute Travel Delays
Visitors should expect 30+ minute waits when heading north and sound bound on the Pinto Basin Road. Due to construction activity around Cottonwood Visitor Center, additional waits of 30 minutes may be in place when leaving the visitor center parking lot. More »
Deteriorating conditions of Black Rock Canyon Road
The road leading to Black Rock campground has deep potholes, is deeply rutted, and can be difficult to negotiate, especially in large vehicles. Please drive with caution.
Joshua Tree is crisscrossed with hundreds of faults, and is a great place to see raw rocks and the effects of earthquakes. The famous San Andreas Fault bounds the south side of the park, and can be observed from Keys View. Blue Cut Fault in the center of the park can be seen from the hilltop behind Lost Horse Mine. The fault forms the straight, abrupt base of the Hexie Mountains east of Queen Valley.
Fault zones are important factors in localizing natural springs. Movement by faults causes impervious zones of shattered rock fragments to form an underground dam forcing ground water to rise. The Oasis of Mara at the visitor center in Twentynine Palms marks the Pinto Mountain fault. The park has four other fault-caused oases that support the native palm tree, Washingtonia filifera. These oases supply food and water to a wide variety of wildlife and point to the connection between the park's geology and its wildlife habitat.
Will Joshua Tree National Park experience a large earthquake anytime soon? Despite a great amount of recent seismic research, no one can yet predict earthquakes with any accuracy. The earth will continue to shake in Southern California, and most earthquakes will be small- "felt" by seismographs, rarely by people. Occasionally, a larger one will occur, but when or where remains unknown.
Did You Know?
Five of North America's 158 desert fan palm oases are located in Joshua Tree National Park, where fault lines force water to the surface. More...