WILLIAMS — Kaibab National Forest fire managers plan to initiate prescribed fire treatments on Monday, May 20, on the Three Sisters Prescribed Fire Project located just north of the City of Williams and Interstate 40, east of Airport Road, west of Highway 64, and along the north shore of Kaibab Lake. The planned ignition date may change should conditions not prove conducive for safety and smoke impacts. Crews are targeting a total of 2,245 acres on four units and anticipate ignitions to take up to three days, conditions safely allowing.