If you are searching through the TV listings for something to watch, take a look at Strip the City on the Science Channel. There are a number of episodes from different cities but take a look at the episode about Chicago. One part of the show features the bridges across the river and they include the Michigan Avenue bridge getting jammed open when the weather was too hot.
If you are a regular reader of this blog or a subscriber to my YouTube channel, the footage might seem familiar. Have a look here and you will see what I mean. This is one of a couple of projects where my video footage has been used. I guess video is a useful addition to the portfolio!