Hope it's ok to post this without any borax. .. I just love this picture. This is a pack of mules hauling sand and cement to repair the dam on Waugh Lake, near Yosemite National Park in 1977. The repairs to the face of the dam required 500 tons of sand and cement at the dam site. Because of provisions of the 1964 Wilderness Act, the Forest Service would not issue a permit for the material to be transported into the site by helicopter. Over 100 mules were used, and had to be re-shod every four weeks because of the rocky granite trails. Waugh Lake Dam Repair