Bill Griffin en Voices of the Hennepin Canal <p>Rich Egger's guest on Emphasis is Western Illinois University Geography Professor Emeritus Donald “Bill” Griffin. He is author of <em>Voices of the Hennepin Canal: Promoters, Politicians, and the US Army&nbsp; Corps of Engineers.</em><br><br>Construction of the Hennepin lasted from 1892 to 1908. Griffin said concrete was used to build the navigation locks and dams, marking the first time this was done in the US.<br> Fri, 21 Sep 2012 05:32:32 +0000 Rich Egger 21892 at Voices of the Hennepin Canal