I had a chance to walk a stretch of the Pedernales River yesterday. Seems like an artifact would have no chance for survival with all the large river rocks tumbling around.
My advise is the same as a couple of other surfacers getting on a property...Just DO it.
Very Very strange things happen in the flint world. as far as condition, a point might have just fallen off a bank last night.
Also might depend on what part of the river, the very lower reaches before going into Travis seems heavily silted and wouldn't damage any points,,,would also make it impossible to find any laying out