d3261190_Tree_National_Park_information__Information
[Name] Barker Dam [Miles] 1.2 (loop) [Elevation] 40 [Information] 
Built by cattle ranchers at the end of the nineteenth century, Barker Dam is a small construction that in wet times holds back a pool in the granite boulders just inside the south edge of the Wonderland of Rocks. The loop hike past the pool also encounters plenty of Joshua trees, and a petroglyph panel (defaced by a film crew); it starts from a side road near the Hidden Valley campground.
Joshua Tree National Park information
Information