The Goltra fire, burning on more than 200 acres in Jefferson County, continued to grow overnight Wednesday, shutting down U.S. 6 along Clear Creek Canyon. Fire officials first reported the lightning-sparked wildfire near Lookout Mountain in Golden around 5 p.m. Tuesday and the flames quickly spread across a “guesstimated” 10 acres, fire officials said. By Wednesday morning, fire officials said the wildfire had charred more than 200 acres. “Down-canyon winds caused some very erratic fire behavior last night and it grew significantly,” Jefferson County Sheriff’s Office spokeswoman Jackie Kelley said in a Wednesday morning briefing.