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THE GREAT LAKES OF NORTH AMERICA

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Originally appearing in Volume V12, Page 401 of the 1911 Encyclopedia Britannica.
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THE See also:

GREAT LAKES OF See also:NORTH See also:AMERICA  . The connected See also:string of five fresh-See also:water inland seas, Lakes See also:Superior, See also:Michigan, See also:Huron, See also:Erie and See also:Ontario, lying in the interior of See also:North See also:America, between the Dominion of See also:Canada on the north and the See also:United States of America on the See also:south, and forming the See also:head-See also:waters of the St See also:Lawrence See also:river See also:system, are collectively and generally known as " The See also:Great Lakes." From the head of See also:lake Superior these lakes are navigable to See also:Buffalo, at the See also:foot of lake Erie, a distance of 1023 m., for vessels having a See also:draught of 20 ft.; from Buffalo to See also:Kingston, 191 M. farther, the draught is limited, by the See also:depth in the Welland See also:canal, to 14 ft.; lake Superior, the largest and most See also:westerly of the lakes, empties, through the river St See also:Mary, 55 M. See also:long, into lake Huron . From Point See also:Iroquois, which may be considered the foot of the lake, to Sault Ste See also:Marie, St Mary's Falls, St Mary's Rapids or the Soo, as it is variously called, a distance of 14 m., there is a single channel, which has been dredged by the United States See also:government, at points which required deepening, to give a minimum width of 800 ft. and a depth of 23 ft. at mean See also:stage water . Below the Sault, the river, on its course to lake Huron, expands into several lakes, and is divided by islands into numerous contracted passages . There are two navigated channels; the older one, following the See also:international boundary-See also:line by way of lake See also:George,19z ft., the height varying as the lakes See also:change in level . The enormous growth of inter-lake See also:freight See also:traffic has justified the construction of three See also:separate locks, each overcoming the rapids by a single lift-two See also:side by side on the United States and one on the See also:Canadian side of the river . These locks, the largest in the See also:world, are all open to Canadian and United States vessels alike, and are operated See also:free from all taxes or tolls on See also:shipping . The Canadian See also:ship canal, opened to traffic on the 9th of See also:September 1895, was constructed through St Mary See also:Island, on the north side of the rapids, by the Canadian government, at a cost of $3,684,227, to facilitate traffic and to secure to Canadian vessels an entrance to lake Superior without entering United States territory . The canal is 5967 ft. long between the extremities of the entrance piers, has one See also:lock 900 ft. long and 6o ft. wide, with a depth on the sills at the lowest known water-level of 201 ft . The approaches to the canal are dredged to 18 ft. deep, and are well buoyed and lighted . On the United States side of the river the length of the canal is I m., the channel outside the locks having a width varying from Io8 to 600 ft. and depth of 25 ft . The locks of 1855 were closed in 1886, to give See also:place to the See also:Poe lock .

The Weitzel lock, opened to See also:

navigation on the 1st of September 1881, was built south of the old locks, the approach being through the old canal . Its chamber is 515 ft. long between lock See also:gates, and 8o ft. wide, narrowing to 6o ft. at the gates . The length of the See also:masonry walls is 717 ft., height 392 ft., with 17 ft. over See also:mitre sills at mean stage of water . The Poe lock, built because the Weitzel lock, large and fully equipped as it is, was insufficient for the rapidly growing traffic, was opened on the 3rd of See also:August 1896 . Its length between gates is 800 ft.; width See also:loo ft.; length of masonry walls Irmo ft.; height 431 to 45 ft., with 22 ft. on the mitre See also:sill at mean stage . The See also:expenditure by the United States government on the canal, with its several locks, and on improving the channel through the river, aggregated fourteen million dollars up to the end of 1906.1 Plans were prepared in 1907 for a third United States lock with a separate canal approach . The canals are closed every See also:winter, the See also:average date of opening up to 1893 being the 1st of May, and of closing the 1st of See also:December . The pressure of business since that See also:time, aided possibly by some slight See also:climatic modification, has extended the See also:season, so that the average date of opening is now ten days earlier and of closing twelve days later . The earliest opening was in 1902 on the 1st of See also:April, and the latest closing in 1904 on the loth of December . The table below gives the average yearly See also:commerce for periods of five years, and serves to show the rapid increase in freight growth . Around the canals have grown up two thriving towns, one on the Michigan, the other on the Ontario side of the river, with manufactories driven by water-See also:power derived from the Sault . Statement of the commerce through the several Sault Ste Marie canals, averaged for every five years.' Years .

Pass- Registered Passen- See also:

Coal . See also:Flour . See also:Wheat . Other See also:General See also:Salt . See also:Iron Ore . See also:Lumber . See also:Total ages . See also:Tonnage. See also:gers . See also:Net Tons . Barrels . Bushels . Grains .

Merchan- Barrels . Net Tons . M. ft . Freight . dise . Bushels . Net Tons . B.M . Net Tons . 1855-18593 387 192,207 6,206 4,672 19,555 None . 34,612 2,249 1,248 27,206 320 55,797 1880-1884 4,457 2,267,166 34,607 463,431 681,726 5,435,601 936,346 81,966 107,225 867,999 79,144 2,184,731 1885-1889 7,908 4,901,105 29,434 1,398,441 1,838,325 18,438,085 1,213,815 74,447 175,725 2,497,403 197,605 5,441,297 1890-1894 11,965 9,912,589 24,609 2,678,805 5,764,766 34,875,971 1,738,706 87,540 231,178 4,939,909 510,482 10,627,349 1895-1899 18,352 18,451,447 40,289 3,270,842 8,319,699 57,227,269 23,349,134 164,426 282,156 10,728,075 832,968 19354,974 1900-1904 19,374 26,199,795 54,093 5,457,019 7,021,839 56,269,265 26,760,533 646,277 407,263 20,020,487 999,944 31,245,565 1906 alone 22,155 41,098,324 63,033 8,739,630 6,495,350 84,271,358 54,343,155 1,134,851 468,162 35,357,042 900,631 51,751,080 has a width of 150 to 300 ft., and a depth of 17 ft.; it is buoyed but not lighted, and is not capable of navigation by See also:

modern large freighters; the other, some 12 m. shorter, an artificial channel dredged by the United States government in their own territory, has a minimum width of 300 ft. and depth of 20 ft . It is elaborately lighted throughout its length .

A third channel, See also:

west of all the islands, was designed for steamers See also:bound down, the older channel being reserved for upbound boats . Between lake Superior and lake Huron there is a fall of 20 ft. of which the Sault, in a distance of m., absorbs from 18 to The outlet of lake Michigan, the only lake of the See also:series lying wholly in United States territory, is at the Strait of Mackinac, near the point where the river St Mary reaches lake Huron . With lake Michigan are connected the See also:Chicago Sanitary and Ship canal, the See also:Illinois and Michigan, and the Illinois and See also:Mississippi canals, for which see ILLINOIS . With lake Huron is always 1 Statistical See also:report of lake commerce passing through canals . See also:Col . Chas . E . L . B . See also:Davis, U.S.A., engineer in See also:charge, 1907 . 2 Statistical report of lake commerce passing through canals, published annually by the U.S. engineer officer in charge . 3 The first five years of operation .

included Georgian See also:

Bay as well as the channel north of Manitoulin Island . As it is principally navigated as a connecting waterway between lakes Superior and Michigan and lake Erie it has no notable harbours on it . It empties into lake Erie through the river St Clair, lake St Clair and the river See also:Detroit . On these connecting waters are several important manufacturing and shipping towns, and through this See also:chain passes nearly all the traffic of the lakes, both that to and from lake Michigan ports, and also that of lake Superior . The tonnage of a single See also:short season of navigation exceeds in the aggregate 6o,000,000 tons . Extensive dredging and See also:embankment See also:works have been carried on by the United States government in lake St Clair and the river Detroit, and a 20-ft. channel now exists, which is being constantly improved . Lake St Clair is nearly circular, 25 M. in See also:diameter, with the north-See also:east quadrant filled by the See also:delta of the river St Clair . It has a very See also:flat bottom with a general depth of only 21 ft., shoaling very gradually, usually to See also:reed beds that line the See also:low swampy shores . To enter the lake from river St Clair two channels have been provided, with retaining walls of cribwork, one for upward, the other for downward bound vessels . Much dredging has also been necessary at the outlet of the lake into river Detroit . A See also:critical point in that river is at Limekiln See also:crossing, a cut dredged through See also:limestone See also:rock above the Canadian See also:town of Amherstburg . The normal depth here before improvement was 122-15 ft.; by a project of 1902 a channel 600 ft. wide and 21 ft. deep was planned; there are separate channels for up- and down-bound vessels .

Phoenix-squares

To prevent vessels from crowding together in the cut, the Canadian government maintains a See also:

patrol service here, while the United States government maintains a similar patrol in the St Mary channel . The See also:Grand See also:Trunk railway opened in 1891 a single track See also:tunnel under the river St Clair, from See also:Sarnia to See also:Port Huron . It is 6026 ft. long, a See also:cylinder 20 ft. in diameter, lined with See also:cast iron in flanged sections . A second tunnel was undertaken between Detroit and See also:Windsor, under the river Detroit . From Buffalo, at the foot of lake Erie, the river See also:Niagara runs northwards 36 m. into lake Ontario . To overcome the difference of 327 ft. in level between lakes Erie and Ontario, the Welland canal, accommodating vessels of 255 ft. in length, with a draught of 14 ft., was built, and is maintained by Canada . The See also:Murray canal extends from Presqu'ile Bay, on the north See also:shore of lake Ontario, a distance of 62 m., to the headquarters of the Bay of Quinte . See also:Trent canal is a See also:term applied to a series of water stretches in the interior of Ontario which are ultimately designed to connect lake Huron and lake Ontario . At Peterboro a See also:hydraulic See also:balance-lock with a lift of 65 ft., 140 ft. in length and 33 ft. clear in width, allowing a draught of 8 ft., has been constructed . The See also:ordinary locks are 134 by 33 ft. with a draught of 6 ft . When the whole route of 200 M. is completed, there will not be more than 15 M. of actual canal, the remaining portion of the waterway being through lakes and See also:rivers . For the Erie canal, between that lake and the See also:Hudson river, see ERIE and NEW See also:YORK .

The See also:

population of the states and provinces bordering on the Great Lakes is estimated to be over 35,000,000 . In See also:Pennsylvania and See also:Ohio, south of lake Erie, there are large coal-See also:fields . Sur-rounding lake Michigan and west of lake Superior are vast See also:grain-growing plains, and the prairies of the Canadian north-west are rapidly increasing the See also:area and quantity of wheat grown; while both north and south of lake Superior are the most extensive iron mines in the world, from which 35 million tons of ore were shipped in 1906 . The natural See also:highway for the shipment of all these products is the Great .Lakes, and over them coal is distributed westwards and grain and iron ore are concentrated eastwards . The great quantity of coarse freights, that could only be profitably carried long distances by water, has revolutionized the type of See also:vessel used for its transportation, making large steamers imperative, consolidating interests and cheapening methods . It is usual for the vessels in the grain See also:trade and in the iron-ore trade to make their up trips empty; but in consequence of the admirable facilities provided at terminal points, they make very fast time, and carry freight verycheaply . The cost of freight per ton-mile See also:fell from 23/100 cent in 1887 to 8/roo cent in 1898; since then the See also:rate has slightly risen, but keeps well below 1/10 cent per ton-mile . The traffic on the lakes may be divided into three classes, passenger, package freight and bulk freight . Of passenger boats the largest are 38o ft. long by 44 ft. See also:beam, having a See also:speed of over 20 M. an See also:hour, making the See also:round trip between Buffalo and Chicago 1800 m., or Buffalo and See also:Duluth 2000 m., every See also:week . They carry no freight . The Canadian Pacific railway runs a line of See also:fine See also:Tyne-built passenger and freight steamers between See also:Owen See also:Sound and Fort See also:William, and these two lines equal in See also:accommodation transatlantic passenger steamers . On lake Michigan many fine passenger boats run out of Chicago, and on lake Ontario there are several large and fast Canadian steamers on routes radiating from See also:Toronto .

The package freight business, that is, the transportation of goods in enclosed parcels, is principally See also:

local; all the through business of this description is controlled by lines run by the great trunk See also:railways, and is done in boats limited in beam to 5o ft. to admit them through See also:bridges over the rivers at Chicago and Buffalo . By far the greatest number of vessels on the lakes are bulk freighters, and the conditions of the service have See also:developed a See also:special type of vessel . Originally sailing vessels were largely used, but these have practically disappeared, giving place to steamers, which have grown steadily in See also:size with every increase in available ,draught . In 1894 there was no vessel on the lakes with a capacity of over 5000 tons; in 1906 there were 254 vessels of a greater capacity, 12 of them carrying over 12,000 tons each . For a few years following 1890 many large See also:barges were built, carrying up to 8000 tons each, intended to be towed by a steamer . It was found, however, that the time lost by one See also:boat of the pair having to wait for the other made the See also:plan unprofitable and no more were built . Following 1888 some 40 See also:whale-back steamers and barges, having See also:oval See also:cross-sections without frames or decks, were built, but experience failed to demonstrate any See also:advantage in the type, and their construction has ceased . The modern bulk freighter is a vessel 600 ft. long, 58 ft. beam, capable of carrying 14,000 tons on 20 ft. draught, built with a midship See also:section practically rectangular, the coefficient frequently as high as •98, with about two-thirds of the entire length absolutely straight, giving a See also:block coefficient up to •87 . The triple-expansion machinery and boilers, designed to drive the boat at a speed of 12 M. an hour, are in the extreme stern, and the See also:pilot See also:house and quarters in the extreme See also:bow, leaving all the See also:cargo space together . Hatches are spaced at multiples of 12 ft. throughout the length and are made as wide as possible athwartships to facilitate loading and unloading . The vessels are built on girder frames and fitted with See also:double bottoms for strength and water See also:ballast . This type of vessel can be loaded in a few minutes, and unloaded by self-filling grab buckets up to ten tons capacity, worked hydraulically, in six or eight See also:hours .

The bulk freight generally follows certain well-defined routes; iron ore is shipped east from ports on both sides of lake Superior and on the west side of lake Michigan to See also:

rail shipping points on the south shore of lake Erie . Wheat and other grains from Duluth find their way to Buffalo, as do wheat, See also:corn (See also:maize) and other grains from Chicago . Wheat from the Canadian north-west is distributed from Fort William and Port See also:Arthur to railway terminals on Georgian Bay, to Buffalo, and to Port Colborne for trans-shipment to canal barges for See also:Montreal, and coal is distributed from lake Erie to all western points . The large shipping trade is assisted by both governments by a system of See also:aids to navigation that See also:mark every channel and danger . There are also See also:life-saving stations at all dangerous points . The Great Lakes never freeze over completely, but the harbours and often the connecting rivers are closed by See also:ice . The navigable season at the Sault is about 72 months; in lake Erie it is somewhat longer . The season of navigation has been slightly lengthened since 1905, by using powerful tugs as ice-breakers in the See also:spring and autumn, the Canadian government undertaking the service at Canadian terminal ports, chiefly at Fort William and Port Arthur, the most northerly ports, where the season is naturally shortest, and the Lake See also:Carriers' Association, a federation of the freighting steamship owners, acting in the river St Mary . See also:Car ferries run through the winter across lake Michigan and the Strait of Mackinac, across the rivers St Clair and Detroit, and across the See also:middle of lakes Erie and Ontario . The largest of these steamers is 350 ft. long by 56 ft. wide, draught 14 ft., See also:horse power 3500, speed 13 knots . She carries on four tracks 30 freight cars, with 1350 tons of freight . Certain passenger steamers run on lake Michigan, from Chicago north, all the winter .

The level of the lakes varies gradually, and is affected by the general See also:

character of the season, and not by individual rainfalls . The See also:variations of level of the several lakes do not necessarily synchronize . There is an See also:annual fluctuation of about 1 ft. in the upper lakes, and in some seasons over 2 ft. in the See also:lower lakes; the lowest point being at the end of winter and the highest in midsummer . In lake Michigan the level has ranged from a maximum in the years 1859, 1876 and 1886, to a minimum nearly 5 ft. lower in 1896 . In lake Ontario there is a range of 51 ft. between the maximum of May 187o and the minimum of See also:November 1895 . In consequence of the shallowness of lake Erie, its level is seriously disturbed by a persistent See also:storm; a westerly See also:gale lowers the water at its upper end exceptionally as much as 7 ft., seriously interfering with the navigation of the river Detroit, while an easterly gale produces a similar effect at Buffalo . (For physiographical details see articles on the several lakes, and UNITED STATES.) There is See also:geological See also:evidence to show that the whole See also:basin of the lakes has in See also:recent geological times gradually changed in level, rising to the north and subsiding southwards; and it is claimed that the See also:movement is still in See also:gradual progress, the rate assigned being •42 ft. per loo m. per See also:century . The See also:maintenance of the level of the Great Lakes is a See also:matter of great importance to the large freight boats, which always load to the limit of depth at critical points in the dredged channels or in the harbours . Fears have been 'entertained that the water power canals at Sault Ste Marie, the drainage canal at Chicago and the dredged channel in the river Detroit will permanently lower the levels respectively of lake Superior and of the Michigan-Huron-Erie See also:group . An international deep-waterway See also:commission exists for the See also:consideration of this question, and See also:army See also:engineers appointed by the United States government have worked on the problem.' Wing dams in the rivers St Mary and Niagara, to retard the discharges, have been proposed as remedial See also:measures . The Great Lakes are practically tideless, though some observers claim to find true tidal pulsations, said to amount to 3z in. at spring See also:tide at Chicago . Secondary undulations of a few minutes in See also:period, ranging from 1 to 4 in., are well marked .

The Great Lakes are well stocked with See also:

fish of commercial value . These are largely gathered from the fishermen by See also:steam tenders, and taken fresh or in frozen See also:condition to railway distributing points . In lakes Superior and Huron See also:salmon-See also:trout (Salvelinus namaycush, Walb) are commercially most important . They ordinarily range from Io to 5o lb in See also:weight, and are often larger . In Georgian Bay the catches of See also:whitefish (Coregonus clupeiformis, Mitchill) are enormous . In lake Erie whitefish, lesser whitefish, erroneously called lake-See also:herring (C. See also:artedi, Le Sueur), and See also:sturgeon (Acipenser rubicundus, Le Sueur) are the most See also:common . There is See also:good See also:angling at numerous points on the lakes and their feeders . The river See also:Nipigon, on the north shore of lake Superior, is famous as a stream abounding in speckled trout (Salvelinus fontinalis, Mitchill) of unusual size . See also:Black See also:bass (Micropterus) are found from Georgian Bay to Montreal, and the maskinonge (Esox See also:nobilior, Le Sueur), plentiful in the same waters, is a very See also:game fish that often attains a weight of 70 lb . ' Report of the See also:Chief of Engineers, U.S . Army, in Report of See also:War See also:Department, U S . 1898, p .

3776 . Lake Survey See also:

Office (Detroit, Mich, 19o7): Annual reports of Canadian Department of Marine and See also:Fisheries (See also:Ottawa, 1868 seqq.) . (W . P .

End of Article: THE GREAT LAKES OF NORTH AMERICA
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