Here I was about to try to create a hatch chart for our Western Wisconsin area and I find an absolutely outstanding one on the web.
It can be found at www.silverdoctor.net
Go to the Menu section and under the Guided Fishing section, you'll find an extensive hatch chart that includes mayflies, caddis, stoneflies, midges, terrestrials, and a portion on streamers and searching flies. I was unable to link directly to the hatch chart, but that gives you time to explore this great site.
Special thanks to:
Bob Blumreich of Silver Doctor Fly Fishing.