Previous pic of piano part (thanks Randall) was found near here. There have been found if I remember right was some pieces of glass and other items to suggest dinner pieces. Odd thing about this tunnel is that there are rail ties spanning the interior length perpendicular and essentially an area underneath that was excavated to allow the stream to flow under. Much has filled in over the years pushing most of the stream up and over the ties. Any thoughts?
https://www.flickr.com/photos/152266269@N04/37715948101/in/dateposted-public/