18S 



NEW YORK STATE MUSEUM 



Details Concerning' Tables and Diagrams 



Topographic relations of catchment areas of some of the main 

 streams tabulated. The following gives an outline of the topog- 

 raphy of Muskingum, Genesee, Croton and Hudson rivers. 



The headwaters of Muskingum river lie at an elevation of about 

 1100 feet, and it flows into the Ohio river, near Marietta, at an 

 elevation of about 500 feet. The Muskingum river proper has a 

 length of 109 miles, with its main tributaries, the Walhonding and 

 the Tuscarawas, having an additional length of about 100 miles, 

 thus giving the basin a length of 200 miles. From the head of the 

 Tuscarawas to the junction of the two main tributaries there is 

 a fall of about 2 feet per mile, and from this point to the mouth 

 of the main Muskingum the descent is about 1.5 feet per mile. On 

 the Walhonding the descent is more rapid. At its headwaters, 

 near Mansfield, the stream is from 400 to 450 feet above what it 

 is at its junction with the Tuscarawas. 



The Genesee river rises in Potter county, Pa., and flows in a 

 northerly direction across the State of New York, emptying into 

 Lake Ontario at Rochester, having a total length of about 115 

 miles. Its headwaters are at an elevation of over 2000 feet, while 

 Lake Ontario lies at a mean elevation of 247 feet. This stream is 

 specially characterized by two sets of falls. The three falls at 

 Portage have an aggregate of about 270 feet, while at Rochester 

 the river falls 263 feet, also in three falls, with some intervening 

 rapids. This stream flows for several miles, at Rochester and 

 Portage, over bare rocks. 



The Croton river flows into the Hudson at Croton Landing at an 

 elevation of practically tidewater. Its extreme headwaters in 

 Dutchess county are at an elevation of about 700 feet above tide. 

 Its length is about 35 miles. 



Hudson river, at Mechanicville, is about GO feet above tide, while 

 at its extreme headwaters it is about 3400 feet above tide level. 

 The catchment area above Glens Falls is from 40 to HO miles from 

 east to wesi and from GO to 05 miles from north to south. Below 

 Glens Falls the catchment extends well into southern Vermont 

 and Massachusetts. The length of the stream above Mechanic- 

 ville is from L20 to L25 miles. 



