"From surveys made in 1871-72 by J.P. Cotton, surveys of Somerset Br. 1888 by J.H. Rostock, under the direction of Newport U.S. Engineer office. Reduced and drawn in office of Capt. W.H. Bixby, Corps of Engrs. U.S.A. by P Brosig, 1893." Shows channel from Weir, Mass to Dighton, Mass. in one mile segments.
