Here are a couple shots of the bridge work on Monona Bay on 5/29/12. They were staging materials, the crane, and a small boat:
http://www.flickr.com/photos/51009628@N06/7301236984/http://www.flickr.com/photos/51009628@N06/7301235678/Last night I stopped by O'Sheridan Street again. It looks like the bridge has been raised by adding timbers underneath the wood girders. I think that ballast and rip rap had been added along the roadbed. There was also a barge that had been assembled and was on the water:
http://www.flickr.com/photos/51009628@N06/7368376046/http://www.flickr.com/photos/51009628@N06/7368376656/Kevin