A 100-acre fire is burning north of Durango on U.S. 550, La Plata County tweeted. The fire is growing and has closed U.S. 550 between mile markers 38 and 48 in both directions. Mandatory evacuations have been issued for the Iron Gate Subdivision in the 36,000 block of 550 North. Pre-evacuations have been issued for the east side of 550 North of CR 250 to Electra Lake. An 8,000-acre fire is also burning in northern New Mexico off of U.S.