The picture on the website where they say the bird is nesting in Feb at the Black Dog plant is apparently Miss Mary Ellen that showed up at Elk River. She got ousted by an older female on March 22/2013.
More info here http://www.falconcam-cmnh.org/e107_plugins/forum/forum_viewtopic.php?72174.post
http://www.falconcam-cmnh.org/e107_plugins/forum/forum_viewtopic.php?72646.post