My guess is that you have the Carleton canoe with serial number 15641 since the Kennebec canoe with this serial number is 16 feet long. This is a 17 foot long, CS (Common Sense) grade, Carleton model with western red cedar planking, closed spruce gunwales, birch decks, birch thwarts, birch seats, and a keel. It was built between September, 1920 and July, 1921. The original exterior paint color was dark green. It shipped on July 26th, 1921 to Boston, Mass. A scan showing this build record can be found by following the link at the attached thumbnail image below.
This scan and several hundred thousand others were created with substantial grants from the Wooden Canoe Heritage Association (WCHA) and others. A description of the project to preserve these records is available at http://www.wcha.org/ot_records/ if you want more details. I hope that you will join or renew your membership to the WCHA so that services like this can continue. See http://www.wcha.org/wcha/ to learn more about the WCHA and http://www.wcha.org/join.php to join.
It is also possible that you could have another number or manufacturer if this description doesn't match your canoe. The tag on the bottom of the image at http://forums.wcha.org/attachment.php?attachmentid=2196&d=1162173431 is the type which was probably on the bow deck originally. You may want to see if any nail holes remain. Feel free to reply here if you have any other questions.