A northern Michigan wildfire that has raged across more than 2,000 acres since Friday was, according to a Michigan Department of Natural Resources estimate, 75% contained Monday, the agency said. Some roads that were closed in the Blue Lakes Fire in Montmorency and Cheboygan counties also were reopened, said Kerry Heckman, a DNR spokesperson, in a press release. The fire had been 60% contained Sunday, a day after crews were pulled off fire lines temporarily in the afternoon due to lightning risk. Containment doesn’t necessarily mean the fire is out, Heckman said, but it is unlikely to spread b…