You're right. I saw a video about a Trump parade on the St Croix River (upstream part of the Mississippi), and an observer said it created waves 4-5 feet high. A docked boat sank. In the video, the boats seem to be moving very slowly, but a resident complained of boaters not following boating laws and ettiquet. (sp)

Here's a video of part of the parade on Lake Travis.

https://www.youtube.com/watch?v=7py3HRqnDDw

It seems to me that the boats are going too fast, are too close together, and some of them have too little freeboard. Do you think they are going the prescribed 10 miles per hour? I don't see anybody hot-dogging.

Those boats are going so fast that I thought the video must have been speeded up, but then I saw people on land, and they were moving normally, so it was not speeded up.