You just never know what you're going to find with Google. Today I turned up a report of a kayak trip on Chapman Creek which flows through Chapman's Marsh and into Buffalo Lake (a wide meander of the Fox River) just north of Endeavor, Wisconsin. Chapman Creek and the marsh were presumably named after gg-grandpa B.H. Chapman whose farm was just to the south on the high ground above the marsh. He settled there in 1849. The creek is now essentially a highly modified drainage ditch. Nevertheless, the report has a lengthy description, numerous photos and a video, so it gives an idea of what the marshland was like in the old days.
As an added bonus, the trip ended at the boat landing in Endeavor - the only close-up photos I've ever seen of the actual landing. In the 1880s-1890s, the landing property was owned by Ann Brown, the wife of B.H. Chapman's son Cecil Chapman. This was important because Cecil was my g-grandfather's brother-in-law, and the family connection gave him ready access to the only landing along this stretch of the Fox River. This was essential for his lumber business.
Moral of story - keep Googling.
https://www.wisconsinrivertrips.com/segments/chapman-creek