The Ohio River has a width of about half a mile below Pittsburgh, and this is its medial breadth along its winding course to its mouth at Cairo; but in places it narrows to less than twenty-five hundred feet, while it frequently widens to more than a mile.  A geographical writer says, that, “In tracing the Ohio to its source, we must regard the Alleghany as its proper continuation.  A boat may start with sufficient water within seven miles of Lake Erie, in sight sometimes of the sails which whiten the approach to the harbor of Buffalo, and float securely down the Conewango, or Cassadaga, to the Alleghany, down the Alleghany to the Ohio, and thence uninterruptedly to the Gulf of Mexico.”

There are grave reasons for doubting that part of the statement which refers to a boat starting from a point within seven miles of Lake Erie.  It is to be hoped that some member of the New York Canoe Club will explore the route mentioned, and give the results of his investigations to the public.  He would need a canoe light enough to be easily carried upon the shoulders of one man, with the aid of the canoeist’s indispensable assistant—­the canoe-yoke.

It will be seen that the Ohio with its affluents drains an immense extent of country composed of portions of seven large states of the Union, rich in agricultural wealth, in timber, iron, coal, petroleum, salt, clays, and building-stone.  The rainfall of the Ohio Valley is so great as to give the river a mean discharge at its mouth (according to the report of the United States government engineers) of one hundred and fifty-eight thousand cubic feet per second.  This is the drainage of an area embracing two hundred and fourteen thousand square miles.

The head of the Ohio River, at Pittsburgh, has an elevation of eleven hundred and fifty feet above the sea, while in the long descent to its mouth there is a gradual fall of only four hundred feet; hence its current, excepting during the seasons of freshets, is more gentle and uniform than that of any other North American river of equal length.  During half the year the depth of water is sufficient to float steamboats of the largest class along its entire length.  Between the lowest stage of water, in the month of September, and the highest, in March, there is sometimes a range of fifty feet in depth.  The spring freshets in the tributaries will cause the waters of the great river to rise twelve feet in twelve hours.  During the season of low water the current of the Ohio is so slow, as flatboat-men have informed me, that their boats are carried by the flow of the stream only ten miles in a day.  The most shallow portion of the river is between Troy and Evansville.  Troy is twelve miles below the historic Blennerhasset’s Island, which lies between the states of Ohio and Virginia.  Here the water sometimes shoals to a depth of only two feet.

Robert Cavelier de la Salle is credited with having made the discovery of the Ohio River.  From the St. Lawrence country he went to Onondaga, and reaching a tributary of the Ohio River, he descended the great stream to the “Fa1ls,” at Louisville, Kentucky.  His men having deserted him, he returned alone to Lake Erie.  This exploration of the Ohio was made in the winter of 1669-70, or in the following spring.