At the bottom of this page is an underwater photo of some bluegill in a rock quarry in OH that according to the photo's caption are in the three-pound class; using the diver's hand for comparison, at least a couple of them look to be 13" or better:

http://www.internationallegendsofdiving.com/PastEvents/2007wrap.htm

Here's a 2004 press release from the KY DNR which notes that the largest bluegill submitted to the state Trophy Fish program that year, 1lb. 15 oz., came from a rock quarry:

http://www.kdfwr.state.ky.us/022704.asp