I know this thread is older, but I just searched for it because I've never heard of bears on the Lower San Juan between Sand Island and Mexican Hat. But then I saw one this weekend. The really crazy thing was that it was practically "hanging out" with three coyotes- all seen on the same beach across from Big Stick campsite within minutes of each other. One coyote came out of the bushes, walked along and then went into the weeds a few yards down the beach. The bear followed a minute later and a few minutes after that two more coyotes followed the same path.
"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