Thus one conservation official characterized the various proposals for protecting Rainbow Bridge (2) from the waters impounded by Glen Canyon Dam (1). As the over-all map shows, Lake Powell (named after John Wesley Powell, geographer and explorer) will back up for 186 miles, invading hundreds of miles of canyons large and small. Rainbow Bridge will be caught between two dangers: the waters rising from Lake Powell, and the runoff waters and flash floods from 10,416-foot Navaho Mountain which feed its little stream. Thus protection becomes a complicated matter. One suggestion (see small map at right) is to divert runoff waters by a tunnel into neighboring Aztec Creek, with dams either at Site A or B to stop the rise from Lake Powell. Another is to build a dam at Site C with a pumping station to carry runoff and flood waters over the dam. Materials for Dams A or B would come from the high mesa overlooking the canyon; for Dam C either from the mesa or by barge up the Colorado. Damsite C is the one most favored by conservationists pushing for protection by this means, but others point out that no matter which is chosen, the now untouched wilderness area would be permanently scarred. Meanwhile, Secretary Udall has advanced his own proposals to enlarge the present 160-acre national monument into a great new national park. Three possible parks have been outlined (top left); final decision on these rests chiefly with the canny Navaho Indians, whose reservation covers most of the area.