"QUINCY, Wash. – Bones found along the shoreline of Crescent Bar Island on Tuesday are old and will be turned over to the state Department of Archaeology and Historic Preservation." Source: The Spokesman-Review.
Comment: Finds like this make you wonder how many other artefacts, remains and entire sites are still hidden under lakes and rivers around the world, not to mention under the ocean as the result of changing shorelines. Thousands of discoveries that could change history are probably still buried under sediment and water and we'll never know about them except for lucky accidents like this one in Washington.
In this case, a dam drawdown--lowering of the water level--was carried out to relieve the pressure on a damaged spillway, revealing these human bones. How old they are remains to be seen, but the county coroner believes they may have belonged to a single, prehistoric individual. The teeth show wear marks with "a completely different diet from modern humans," so if he's right about their age, they probably belonged to a northwestern paleoindian.