MONTANA — A federal judge has directed the Fish and Wildlife Service to do a better assessment of how roads affect grizzly bears in Montana’s Flathead National Forest. In a significant — but incomplete — victory for environmentalists, U.S. District Judge Dana Christensen on Friday concluded that the Forest Service’s approval of a management plan had relied upon a “flawed” FWS biological opinion prepared as part of its Endangered Species Act responsibilities. Christensen specifically faulted the federal agency consideration of forest roads’ impacts on the bears’ behavior “FWS acknowledges that road avoidance behavior has negative consequences for grizzly bear populations because displacement from important habitats results in lowered survival rates during the non-denning season,” Christensen wrote, adding that the agency nonetheless “fails to explain” some of the implication in how it calculates the extent of forest roads. [to access the full story a Politico subscription is required]