ifish4wildtrout - I don't think that sighting are justification enough for closure. Pretty sure there has to be some sort of aggressiveness by the bear.
On our last visit Bone Valley my wife and I had a big bear meet us on the bridge in front of the campsite. We were the only people at that site for two nights and never saw the bear again. Our biggest problem was getting the coyotes to hush. Both nights one sat down and started howling within 50 yards of the tent.
jasonkelkins at yahoo dot com