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running from Lake Erie to the Upper Lak 10 THOMPSON'S COAST FILO. LAKE AND RIVER NAVIGATION. _FROM FON DU LAC, LAKE SUPERIOR, TO THE GULF OF 8ST. LAWRENCE. j . above Laxen; Rivani,mre., .. 'Snllcs. «, broatis, cbreadite, a teeks "ehealeeme: Superio' cc .scdesieioa ns 170 85 800 600 ft. St. Mary's River... . 6.66 60 5 2 10to 100 Mi@Bioan,. 22.45.0555: ww BR. = 85 58 700 576' Oregn MSY... i. i, sires 100 25 18 100 576 *¢ Straits of Mackinac,...... 40 20 10 20 to 200 575 ** BAP o5 5. ss ce ae OO =, 306 "0 %00 574 * North CUGHNGL cs cccss ess 150 20 10 §=20 to 200 ea Greorpian Dayy. 06 va vs 140 55 40 500 574 * Oh, COE AV Oi ns csc ne anes 38 1% 1 20to 60 x Dake Bt. Clair, *.. cc. ciee cs 25 25 18 10to 20 568 '° Detrolt Rivers 6 wsi as. a » 3 1 10to: 00 WO oo asses 250 "0 40 200 . ee" Miagara River, :.o0iescucss 35 3 1 ONIATIO, cases eceseeecee 58 40 600 224 St. Lawrence River,....... 760° _ 100 = ; Lake St. Francis, foot LOGE BOB oo iiss ss ics 4 142 * Lake St. Louis, foot Cas- cade Rapids, co. i..eess: ; 5 566 AS MOUTON) oi. .is : 3 a3 . Maalee Bt: Peter... 2.2. 12 o* Tide-water at Three Rivers J, * Al Quebec... se 1 G* Total miles navigation,.. 2,835 COURSES AND DISTANCES ON LAKE MICHIGAN. gee All courses marked thus [*] are magnetic, Courses. Miles. From Chicago to Grose Point, . . oe NNW 12 "Chicago to Racine, ye re *N}W 57 "Chicago to South Manitou Island, . . *NbyE2E 221 'Chicago to Grand River, eg 6¢ Chicago to Kalamazoo River, . . . . *NESE 90 Chicago to St. Joseph EbyN3N 61 "Chicago to New Buffalo, . . 8 . *ERS = 45 « * The S¢. Clair Flats, which have to be passed by all large steamers and sail vessels, es, now affords twelve feet of water, the ship channel being very narrow and winding, where stands two light houses and buoys to | guide the mariner.