A cannon for a fix

摘要

Highway 61 in southeastern Minnesota is one of the most picturesque roadways in the Midwest. Part of the national Great River Road, Highway 61 leads drivers through a landscape bordered by steep, forested bluffs on one side and panoramic, scenic views of the Mississippi River valley on the other. On Sept. 22, 2010, an autumn rainstorm dumped 6-10 in. of water on the area, causing more than $60 million in damage to the local roads and highways. Fixing the damage quickly and limiting traffic congestion required looking at unconventional methods and techniques.