Temporary work is set to begin in the Dry Lake Hills area along Schultz Creek and at the base of Mt. Elden. Coconino National Forest officials say temporary roads will be built staring Friday and likely continue Saturday. Crews will then begin to thin around 642 acres of forest as part of the Flagstaff Watershed Protection Project. Logging activities are necessary to reduce the risk of fire burning though the forest, which could cause severe post-fire flooding into Flagstaff. During work the Arizona National Scenic Trail will remain open but re-routed. However Lower Oldham and Rocky Ridge trails will be closed at least through the weekend. The project is supported by a ten-million dollar bond passed by voters in 2012.