The Wisconsin River has them in pretty good quantity, and the hook and line season runs from the first Sat. in Sept., to Oct. 15th each year. If you want to keep one, a few years ago, the dnr came up with a plan to have different size limits every other year. I believe it's 50" one year, then 70" the next. I haven't been able to fish for them for a few years, though my cousin caught and released one about 65", while fishing with me in 1997. They put up a great fight and, although they usually want to hug the bottom, they will frequently jump too. Musky or heavy duty catfish tackle is called for.
Unfortunately, next year, the dnr is going to charge, I believe $20 for what was previously, a free tag, that you need if you want to fish for them, and keep one. I think that there will be a big decline in the amount of hook and line fisherman next year. You can keep one a season above the legal limit.
I was actually on the water a few years ago, fishing nearby, when the guys on this website,
www.carpecarpio.com/sturgeonfishing.html, caught and released these two sturgeon.
There are other rivers around the state that have a season also, and they are trying to stock the fish in parts of the upper WI River system up near Steven's Point, and Wasau, I guess. The biggest place they seem to fish for them now is below the Dells or Sauk City dams.
You can also get some info. at
www.lake-link.com