A few years ago we were floating by the damn at Berryessa. Nobody around.
They have warning buoys, then 100 yards or so closer a physical log boom thing. Well we floated a few feet past warning buoys, started engine and pulled back clear of them. Well not more then 10 minutes later sheriff boat cruised up towards us, took a look and kept going. We thought it was a coincidence then. Not do sure now.