Maritime History of the Great Lakes

Thompson's Coast Pilot for the Upper Lakes, on Both Shores, from Chicago to Buffalo, Green Bay, Georgian Bay and Lake Superior ... [5th ed.], p. 15

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THOMPSON'S COAST PILOT. 15 Laxe Hurovy, lying at a height of 574 feet above the sea, is 250 miles long, 100 miles broad, and 750 feet greatest depth ; area, 21,000 square miles, This lake is almost entirely free of islands, presenting a large expanse of pure water. Its most remarkable feature is Saginaw Bay, lying on its western bor- der. The waters of this lake are now whitened by the sails of commerce, it being the great thoroughfare to and from Lakes Michigan and Superior. : Groratan Bay, lying northeast of Lake Huron, and of the same altitude, being' separated by islands and headlands, lies wholly within the cofifines of Canada. It is 140 miles long, 55 miles broad, and 500 feet in depth; area, 5,000 square miles. In the North Channel, which communicates with St. Mary's River, and in Georgian Bay, are innumerable islands and inlets, forming an interesting and romantic feature to this pure body of water. All the above bodies of water, into which are dis- charged a great number of streams, find an outlet by the River St. Clur, commencing at the foot of Lake Huron, where it has only a width of 1,000 feet, and a depth of from 20 to 60 feet, | flowing with a rapid current downward, 38 miles, into Lake Sz. Crater, which is 25 miles long and about as many broad, with a small depth of water; the most difficult naviga- tion being encountered in passing over "St. Clair Flats," where only about 12 feet of water is afforded. Detroit River, 27 miles in length, is the recipient of all the above waters, flowing south- ward through a fine section of country into , Laxe Ents, the fourth great lake of this immense chain. This latter lake again, at an elevation above the sea of 564 feet, 250 miles long, 60 miles broad, and 204 feet at its greatest depth, but, on an average, considerably less than 100 feet deep, dis- charges its surplus waters by the Niagara River and Falls, into Lake Ontario, 330 feet below; 51 feet of this descent being in the Rapids immediately above the Falls, 160 feet at the Falls themselves, and the rest chiefly in the Rapids between the Falls and the mouth of the river, 22 miles below Lake Erie. This is comparatively a shallow body of water; and the relative depths of the great series of lakes may be illustrated by saying, that te ha a a a i al eT ka a

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