The Cottage Grove Fire Department reports firefighters were on the scene of a grass fire of around 80 acres Wednesday. A Facebook post from the department said the fire was in the area of the dunes prairie south of 100th Street to around 113th Street. Crews from the Minnesota Department of Natural Resources, St. Paul Park, Woodbury, the Lower St. Croix Valley and Lake Elmo were also on the scene. The post said there have been no reports of injuries.