An article in Sun Times yesterday mentioned removal of Hoffman Dam on Des Plaines river last year has already improved fishing conditions on Des Plaines river. Also, a number of mature tagged smallmouth were released into the river, similar to release in Dupage River last year, in attempt to give kick start to smallie population regeneration in the river. Here is link to article written by Dale Bowman.
http://www.suntimes.com/sports/outdoors/15660410-452/fishing-outdoors-removal-of-dam-has-transformed-des-plaines-river.html