Site with water temperatures?

My last open water swim of the year, yesterday, was about 12 strokes, which surely won me a medal in age class! Cold. I am looking for sites that might give accurate water temps. NOAA said the water was 69 degrees, but it certainly felt in the fifties. coastwatch.msu.edu is interesting but insufficiently local. Any suggestions? I'm looking specifically for Chicago. Thanks! Did anyone read the article on swimming across the Mississippi in the current Outside magazine? (It may also be available online.) Alligator gar. VB