Murals: I - Exploration II - Fort Dearborn III - The New City IV - Float Bridge and I & M Canal V - Three Swing Bridges VI - The Great Fire VII - Three Bridges VIII - Columbian Exposition IX - Reversal of the Waters X - Michigan Avenue Bridge XI - Grant Park and the Burnham Plan XII - A Century of Progress XIII - The South Branch XIV - The North Branch XV - The Main Branch XVI - The Riverwalk Artwork copyright 2000 Ellen Lanyon All rights reserved Acknowledgements by Ellen Lanyon Essay by Michael Rooks

X The Michigan Avenue Bridge 1920: As the first double-deck trunnion bascule style bridge, the Michigan Avenue Bridge was the first to accommodate two levels of traffic. The Chicago river was teeming with commercial ships and excursion boats. The Wrigley building, built between 1921 and 1924, and Tribune Tower, dedicated in 1925, became two important Chicago landmarks and formed a gateway to the avenue known as the Magnificent Mile.