The work is only beginning for the U.S. Forest Service when the last wisp of smoke disappears from any large wildfire. After more than 700,000 acres of national forest lands burned in Montana this summer, the agency decided the usual way of doing business wasn’t going to cut it this year. …Those efforts consider everything from replacing culverts and reshaping roads to keep sediment from roaring down hillsides, to deciding which burned trees can be salvaged for timber and where trees will need to be planted. The bulk of that work has to be done quickly in order to be ready for spring runoff and to ensure the timber that’s set aside for harvest retains its value for local mills.