On this date in Minnesota History: June 30

June 30, 1992 – “A train derailed in Superior, Wis., that sent a tanker car of benzene into the St. Louis River. National media swarmed into the area as a resulting cloud of possibly toxic smoke led to the evacuation of 50,000 area residents of Superior and Duluth.”

http://www.thehistorypeople.com/data/docs/timeline-part3.pdf

Saint Louis River drainage basin

http://en.wikipedia.org/wiki/File:Stlouisrivermap.png

I remember this well. My then 1-year old niece was evacuated from her daycare in Duluth to my parents' house in Cloquet.