NEW YORK STATE MUSEUM 



accompanying table allowance for diversion to the Oswego canal, 

 which is also supplied from this dam, has not been made, but 

 such diversion can not be very large because of the small amount 

 of business on that canal during the last few years. 



Gagings of Oswego river above Minetto have also been made 

 from September, 1900, to date, at which time a current meter 

 station was established at this point. 



Gagings were also begun in 1898 at the upper dam at Fulton, 

 which is a well-built stone dam and has no leakage. The dam is 

 404.6 feet in length, with a crest practically level. The following 

 cut shows the form of this dam : 



Fig. 22 Section of dam at Fulton. 



Geologically the Oswego river lies in the horizon of the Medina 

 sandstone and Clinton groups. 



Discharge measurements of Seneca river. This station is 

 located at the stone dam on Seneca river at Baldwinsville. The 

 outlets of Otisco, Skaneateles and Owasco lakes, tributaries of 

 Seneca river, are crossed by the Erie canal and a portion of their 

 flow intercepted for the supply of this canal. The chief supply 

 for the Erie canal to Montezuma marsh is from Lake Erie and 

 Lake Erie water is discharged into Seneca river and thus returned 

 through the Oswego river to Lake Ontario. It is uncertain, there- 

 fore, whether the abstraction from Otisco, Skaneateles and 

 Owasco lakes is very material, as the amount discharged in Seneca 

 river varies and has never been closely measured. 



The upper reaches of Seneca river are canalized, forming the 

 Cayuga and Seneca canal, while the portion below Baldwinsville, 



