NEW : At least three other significant wildfires are burning around Colorado . Firefighters are `` optimistic '' after making inroads battling Black Forest Fire in central Colorado . An official estimates 45 % containment , up from 5 % the previous morning . Study warns of continued wildfires in western U.S. CNN 's George Howell reported from Colorado Springs , and Greg Botelho wrote in Atlanta . The fire is now threatening homes and businesses on both sides of Highway 36 between Boulder City and Fort Collins.
NEW : At least three other significant wildfires are burning around Colorado . Firefighters are `` optimistic '' after making inroads battling Black Forest Fire in central Colorado . An official estimates 45 % containment , up from 5 % the previous morning . The fire is now threatening homes and businesses on both sides of Highway 36 between Boulder City and Fort Collins.