The Old Town records for 8840, 8340, and 6340 don't show an 18 foot long canoe. The one for 6840 does but it has been discussed at http://forums.wcha.org/showthread.php?t=5449 so that probably isn't the one you are are looking for. The Kennebec record for number 8340 is 18 feet as is the Carleton record for 8840. Can you supply some pictures?