Arachnid by a lake in Wisconsin, ~10cm long

Dolomedes fishing spider. Probably a Dolomedes tenebrosus. Also known as a Dock Spider, because they live on or around....I forget.

They are cool. They run over the surface of the water, then stab down through the surface tension to drag up minnows and tadpoles and whatnot.

~10cm? We usually measure body length only.