Black River (Chehalis River tributary) (Wikipedia)
excerpt
The Black River is a river in Thurston County in the U.S. state of Washington. It is approximately 25 miles (40 km) long with a drainage basin of about 144 square miles (370 km2).
Picnic Point Mystery Revisited (psmhsinsidepassage.blogspot.com)Several months ago we posted Joe Baar’s query about a mystery hull at Picnic Point. Since that time Joe has pulled together information from a number of sources to provide this likely solution to the mystery.