Barker Dam is inside Joshua Tree National Park and is a short hike, about a 1.1 mile loop. It is also a well-marked trail and an easy hike. The only part I had trouble with was where a huge rock overhung the trail right on the pond. However, as I was determined to get to the other side of the trail and complete the loop, a grabbed the rock with one hand and swung over! From that side, I could actually see the dam and the stream below. And, as I continued on the loop, I saw signs pointing to the Indian petroglyphs. Scenic Sunday for April 18, 2010.