Documentary History of the State of New York, Vol. II
It is navigated by some, sloops, and from hence there is carrying place of 14 miles to Le Beuf, in Pennsylvania, near the head waters of French Creek, wdiich is navigable by boats to Alleghany river, and from thence to the Ohio ; and by this route quantities of salt, which is transported from the Military Lands, are conveyed to Pittsburgh. This communication was used by the French before the taking of Fort Pitt from them by the English in 1758, and it is probable that by it, goods could be transported from New York and Albany to the Ohio, at less expense than by any other. There are also communications from the waters of this lake to the Ohio, by the Muskingum and Scioto rivers. Navigation is interrupted from lake Erie to Lake Ontario by a carrying place of 9 miles at the falls of Niagara.
Seneca lake is situated on the Eastern line of this country, and is 35 miles in length, and from 2 to 4 miles wide. It stretches in a direction nearly from south to north, forming a handsome sheet of wholesome water, of great depth, and never freezes over in winter; and in summer, a bottle being let down under the surface, is filled with cool and pure water. It is navigated by a sloop and perriauger, besides boats, and by its outlet boats proceed by Seneca and Onondago rivers to Schenectady. From this lake also, boats proceed by Seneca and Oswego river into lake Ontario, and from thence to Montreal, &c. From the head of this lake, there is a