May 7, 2012 at 6:34 am in Lake County News-Chronicle
CLOQUET The forests along Highway 61 between Duluth and Grand Portage are constantly changing. In many areas, birch has replaced the spruce and balsam fir that were common to the area in the early 20th century. In the early 1900s, birch was found mixed with these conifers on moist soils. Logging, homesteading and fires created conditions for birch to expand.