Aerial photographs of the Mississippi River and towns along it (http://crystal.isgs.uiuc.edu/nsdihome/webdocs/umr1927/aerials/) from the Illinois State Geological Society. Covers a bit of Wisconsin, Iowa, and Illinois right now including the Quad Cities and Dubuque.
Fixed URL tag. -BR
This is nice thanks. For Dubuque, you can see the old Eagle Point Bridge (US-61...151 not yet) in Pool 11, and the predecessor to the Julien Dubuque (US-20) bridge in Pool 12.