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Form 10-900-a Wisconsin Word Processing Format (Approved 1/92) United States Department of the Interior National Park Service National Register of Historic Places Continuation Sheet Advance Shipwreck (Barge) Section _7 Page 3 Town of Nasewaupee, Door County, Wisconsin As the Advance’s stempost and sternpost are missing, the remaining keelson structure begins at 8.7 feet and ends at 125 feet along the baseline and consists of the keel, keelson, rider keelson, and sister keelsons. The first 30 feet of the structure along the baseline lists 10° to starboard. Aft of this, the structure lists 6° to starboard indicating a break in the keelson assembly toward the stern of the vessel. Additionally, because of the 10° list in the stern and the relatively hard bottom substrate in this area, a small portion of the keel was located on the port side approximately 8.7 feet along the baseline. Although the sided dimension of the keel could not be determined, the keel’s molded dimension measures 1.5 feet. The keelson is located between 8.0 feet and 124.8 feet on the baseline measuring 1.2 feet sided and 1.2 feet molded. A rider keelson is fastened on top of the keelson starting at 16.5 feet on the baseline and ending at 121.5 feet, measuring 1.1 feet sided and 1.1 feet molded. The rider keelson is broken at 16.5 feet along baseline with the other section located 4.0 feet aft and fallen to starboard. These two sections of rider keelson were connected by a nib scarf. Scarphs were used to lengthen timbers without losing longitudinal support. Each nib scarf joint is indented 0.2 feet then cut at an oblique measuring 0.8 feet thick to 0.5 feet thick. The length of the oblique measures 3.8 feet long and when joined, both ends fit together to create a straight timber that would then be through-bolted. The sister keelsons added in 1915, lie on either side of the keelson. Both measure 0.9 feet sided and 0.7 feet molded. The starboard side sister keelson begins at 30.0 feet on the baseline and extends to 124.2 feet. The port side sister keelson begins at 26.0 feet on the baseline and extends to 123.0 feet on the baseline. The keelson structure was fastened together using through bolts measuring 0.1 feet in diameter. The Advance was outfitted with one centerboard. The only remaining evidence of the vessel’s centerboard location is the bottommost timbers that comprised the centerboard trunk. The centerboard trunk begins at 76.4 feet along the baseline and measures 26.2 feet long with an overall width of 1.1 feet. The housing slot for the centerboard within the trunk measures 0.5 feet wide with 0.3 foot timbers on either side. Remnants of the centerboard and pivot pin were not extant on the site, removed over years of site formation processes. Frame sets along the centerboard truck have been dislodged from their original position showing the location of pocket pieces. To ensure a watertight centerboard trunk, floors and first futtocks did not penetrate through the keelson structure. Instead, centerboard timbers were placed between the keel and keelson with carved insets, called pocket pieces, for the frame sets. The Advance ’s pocket pieces measure 0.8 feet by 1.0 feet, and are 0.5 feet deep. Only three sets of frames remain intact in the pocket pieces along the port side of the centerboard trunk. Although much of her upper hull is no longer extant, Advance’s floors and futtocks remain. The vessel is double framed with 1.18 feet spacing between each frame set. The lengths of the starboard frames vary from 4.3 feet to 18.6 feet, while the lengths of the port frames vary from 2.4 feet to 15.0 feet. Individual futtocks measure 0.4 feet and 0.3 feet sided, with an overall sided dimension of 0.7 feet. The molded dimension measures 0.85 feet at the sister keelson and 0.65 feet at the turn of the bilge.