Topographical Sketch of the State of Ncw-YorJc. 105 



No. XII. 



Table of Ascents and Distances on the line of the Erie Canal, 

 through the Mohawk valley from the mouth of the river to Little 

 Falls, and thence along the St. Lawrence basin to Lake Erie. 



That part of the above section between Utica and Lake Erie, 

 presents a remarkable uniformity of elevation, with only one inter- 

 vening depression of 45 feet at the Seneca river. The great 

 length of it» levels is also a striking feature of the Erie canal : the 

 Utica level is 69£ miles long, and the Rochester level extends a 

 distance of 63 miles. These facts, however, are both readily ex- 

 plained from a consideration of the circumstance that the canal 

 passes from the Little Falls to Lake Erie along the slope of the St. 

 Lawrence basin, the gradual descent of which to the north is high- 

 ly favorable to the graduation of a line to the most uniform eleva- 



The following are the elevations of the principal lakes in this 

 state, included within the boundaries of the lower sub-basin of the 

 St Lawrence: 



After the lower sub-basin of the St. Lawrence, the principal de- 

 pression of surface connected with the topography of this state, is 

 that containing the Hudson river and Lake Champlain. This de* 



