Part of a sunken fleet of recreational dories, Emerald Bay, California.
The US National Parks Service has a useful page summarizing policies and laws regarding “submerged resources” – which includes underwater archaeological sites. The sections most of interest to the six readers of this blog are probably the pages on Washington State, Alaska, Oregon and California — though the fact that Idaho has a page is, at least, surprising until you remember the importance of paddle-wheelers in the earlier interior historical period all over the west.
Another Emerald Bay dory. Source: http://www.parks.ca.gov/default.asp?page_id=22707
Northwest Coast Archaeology 