Video purporting to show "Champ": could be a swimming beaver.
More distinctive Plesiosaur type sighting below:
Please give the files time to open some of the pdfs have many pages
and it may take a few seconds for them to appear. [Joe Zarzynski 1988] [Gary Mangiacopra 2007Pt.1] [Gary Mangiacopra 2007 Pt.2]
[Unfortunately the links have expired but I believe they are still at the Not Only Nessie site,]