North oriented toward right. Depths shown by soundings and isolines. "This map is the same as Map G no. 30 which accompanied Lieut. Colonel J.D. Graham's annual report (no. 116) to the Chief Topographical Engineer, dated Chicago December 31st 1855 except that the soundings laid down between the U.S. piers and on the outer bar are from survey made in May 1857." "Map G. No. 53." 1 map; 65 x 92 cm This map is in the public domain. Please attribute access and use of this digitized map to the Stephen S. Clark Library, University of Michigan Library.