CHAPTER VII. 



1. TENNESSEE RIVER AT CHATTANOOGA, TENNESSEE. 



This river, after passing Chattanooga, enters Alabama. It 

 then makes a bend to the west and later to the north, returning 

 to Tennessee. Flowing through this State and Kentucky, it 

 empties into the Ohio 50 miles above Cairo. In 1879 a gage 

 was established at Chattanooga, Tennessee, at the foot of Look- 

 out street, just below Chattanooga Island, by the Signal Corps 

 of the United States Army, which has been in charge of the 

 Weather Bureau since July i, 1891. The drainage area above 

 this station is 21,382 square miles, and is mapped on Morris- 

 town, Greenville, Roan Mountain, London, Knoxville, Mount 

 Guyot, Asheville, Murphy, Briceville, Standingstone, Wart- 

 burg, Pikeville, Maynardville, Cumberland Gap, Jonesville, 

 Estillville, Bristol, Whitesburg, Grundy, Abington, Tazewell, 

 Pocahontas, Wytheville, Cranberry, Morganton, Mount Mit- 

 chell, Saluda, Pisgah, Como, Nantahala, Walhalla, Dahlonega, 

 Ellijay, Dalton, Cleveand, Ringgold, Kingston, and Chatta- 

 nooga atlas sheets. The gage is on an incline railroad iron for 

 about 20 feet of its lower portion. Above this it is a vertical 

 rod, bolted to the rock bluff forming the river bank. The zero 

 of the gage is 630.4 feet above sea level. Measurements are 

 made from the Hamilton County steel highway bridge at the 

 foot of Walnut street, a short distance below the gage. Gage 

 heights are obtained from L. M. Pindell, United States Weather 

 Bureau observer. During the year 1900 a new gage on the 

 same datum was established. It is a vertical rod bolted to the 

 south side of the third stone pier from the south end of the 

 bridge. 



