Brian- we saw over 75 sheep in July on that stretch, the most by triple at least I've ever seen down there. A friend of mine just got back from the upper stretch last weekend and said they had a fighting pair at Midway camp when they pulled up- they waited for a while in the boats, but eventually got out. The sheep never even acknowledged them- kept right on fighting and headbutting (with equipment ready apparently) all night long. A group of about 30 females and young ones stayed across the river.
"There is NOTHING--absolute nothing--half so much worth doing as simply messing about in boats. Look here! If you've really nothing else on hand this morning, supposing we drop down the river together, and have a long day of it?" -Wind in the Willows