64Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congress created the Lake Survey within the U.S. Army Topographical Engineers, which later became part of the U.S. Army Corps of Engineers. The Survey, based in Detroit, Michigan, was charged with conducting a hydrographical survey of the Northern and Northwestern Lakes and preparing and publishing nautical charts and other navigation aids. The Lake Survey published its first charts in 1852. In 1882, after producing 76 charts, it had completed its Congressional mandate.Color8000
74Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
52Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
17Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
60Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
66Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
67Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
55Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
59Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
57Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
73Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
58Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
51Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
54Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
68Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
74Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
52Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
17Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
60Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
66Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
67Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
55Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
59Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
57Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
73Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
58Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
51Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
54Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
68Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
74Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
52Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...
17Relief shown by hachures and spot heights. Depths shown by isolines and soundings.IN 1841, Congres...