Anyone know what kind of snake? It could be an endangered timber rattler, very rare in WI and has small habitat that is rocky area of western central WI. A treat to see it! And steer clear, of course. Venomous if you are bitten. A crime to kill it.
www.wildlife.state.nh.us/Wildlife/Nongame/snakes/profile_tim>>>
dnr.wisconsin.gov/eek/critter/reptile/timberrattlesnake.htm
Or it could be a hognose snake - which is not venomous but will bluff you if you get too close...

Rattle snakes tend to have more of a diamond shaped head than the snake in this photo. I'll have a more knowledgeable friend take a look at let you know what is pictured.

Pretty sure it's a Northern Watersnake...I think I saw it today out at the crag. en.wikipedia.org/wiki/Northern_Water_Snake

The head and body patterns seem to match up as well as the described behavior.

The snake you have pictured is a Eastern Fox Snake. A very nice snake, very useful in rodent control. They also make excellent pets for those who are into reptiles. I have had several over the years and in fact, have a baby Fox crawling on my arm as I'm typing this message - she's very cute! Cheers.