Biological Survey — Erie-Niagara Watershed 



113 



25 



o 



Dissolved Oxygen - Per Cent of Saturation 



50 75 ^ ^1 00 1£5 



New York - Penn. ^ \\ 



State Line 



Barcelona 



Dunkirk 



Cattaraugus Creek ^ 



Eighteen Mile Creek ^^ 



Tonawanda 



Niagara Palls 



Lewiston 



Youngstown 



88 



» o 

 «♦ o 



i^ 



n "-* 

 sr 1 

 o 2 



9 



o» 



cr 

 o 



3 



3 



CA cS 



tz] o 



ii 





Lake Ontario*^ 



