HYDROLOGY OF NEW YORK 



lake is only eight miles distant from Lake Erie. Its elevation 

 above tidewater is 1,297 feet, while that of Lake Erie is 573 feet. 

 This stream flows into the Conewango creek about five miles 

 north of the Pennsylvania line, where the elevation above tide- 

 water is 1243 feet. The fall from Chautauqua lake to the south- 

 ern boundary of the State along the drainage line is therefore only 

 51 feet. The catchment area of Chautauqua lake outlet at the 

 foot of Chautauqua lake is 178 square miles and of Chautauqua 

 lake outlet below Cassadiaga creek, its chief tributary, 343 square 

 miles. 



Cassadaga creek. This creek rises in Cassadaga lake at an eleva- 

 tion of over 1300 feet above tidewater, and flows south into Chau- 

 tauqua lake outlet. 



Conewango creek. One branch of this creek rises in the extreme 

 northern part of Cattaraugus county and the other in the northern 

 part of Chautauqua county. It Hows south for part of the way 

 near the comity line between these two counties, and enters Penn- 

 sylvania four miles west of the Avest line of Chautauqua county. 



The territory drained by Conewango creek is. in general, hilly 

 and rolling, although the northern portion of the stream has 

 slight descent with swampy valley. From Markham, in the town 

 of Dayton, to Clear creek, in the town of Conewango, the fall is 

 only 25 feet. Throughout this whole section the channel is qnite 

 irregular, and probably the average stream slope does not exceed 

 one foot per mile. The elevation of the headwaters is 1500 to 

 1600 feet above tide, while at the Pennsylvania line this stream is 

 about 1200 feet above tide. The catchment area in the State of 

 Xew York is 770 square miles. 



Little Valley creek. This creek rises in the central part of Cat- 

 taraugus county and flows southerly into the Allegheny river at 

 Salamanca. The headwaters are at an elevation of about 1700 

 feet above tide, while the elevation at its mouth is about 1380 

 feet. The catchment area is 12 square miles. 



(treat Valley creek. This creek rises in the north central part 

 of Chautauqua county and flows southerly into the Allegheny 

 river, three miles east of Salamanca. The country at the head- 



