AC, I have spent time around Duluth & north of there...
I was a Forestry student and spent a summer at the U of M Forestry camp in Cloquet in the early 70's. We used to do a lot of camping and exploring along the entire north shore all the way to Canada during our weekends and days off. A few years later I was working with a government survey crew marking section corners on Reservation lands.
We spent a few weeks on Pigeon Point where the only access was by boat from Grand Portage. I've crawled all over that penisula! We were a crew of 4 and every day we hauled our survey equipment to remote areas on the penisula in small boats. When we first started, we were renting open fishing boats with 20 hp outboards steered from the stern.
Once we cleared the point leaving G.P. we were in open water for about a 3-mile stretch across a bay before reaching the shelter of the Susie Islands. Every morning, the water was like glass going across, and in the afternoon, the SW wind kicked-up the waves to the point where it seemed like I had to ride the bow to make sure the boat wouldn't tumble over backwards. There was no sense in wearing a life jacket because the water was so cold that survival was probably measured in minutes even if you were floating! There was a day or two when I really believed that we were just as likely to die in that lake as cross that 3-mile stretch of water.
It's hard to believe how stupid we can be with our lives in those days. It just felt like a daily adventure. The outfit had a larger aluminum runabout with a closed bow and a larger outboard, which made the four of us feel safer. When they were done with repairs, they let us rent it after we had enough of those small fishing boats. So the first day out, it was like glass going across west to east. The return in the afternoon was the same thing ... pounding thru the waves, but we felt much more comfortable ... until we reached the dock and unloaded our gear. The boat damn near sunk.
As it happened, a seam had opened up. Water was draining as we were moving, but as soon as the boat stopped, water filled the boat!