A wildfire burning on national-forest land north of Durango has prompted the closure of a portion of U.S. Highway 550. The “416 Fire” was reported Friday morning on the west side of 550, about 10 miles from Durango and just north of Hermosa. It was about 100 acres in size by noon and spreading rapidly to the northwest. Local and Forest Service personnel and equipment are battling it. Pre-evacuation notices had been issued for the Iron Gate subdivision and for the east side of 550 between Baker’s Bridge and Electra Lake.