The Fourth Street Bridge over Interstate-40 in Flagstaff will be closed for three days starting Monday. ADOT need the close the bridge until Wednesday to install new drainage pipe. Drivers heading south on Fourth Street can use Huntington Drive and Industrial Drive north of the work zone. Drivers heading north on Fourth Street can use Butler Avenue and Soliere Avenue south of the work zone. Access for emergency vehicles, bicycles and pedestrians will remain during the closure. The closure is part of construction to widen the bridge to two lanes in each direction. The closure will be in effect from 6 a.m. Monday until 6 p.m. Wednesday. Drivers should allow extra travel time through the area.