450 GEOLOftY OF OHIO. 



Loekington altogether by six locks, an aggregate of sixty-seven feet, in 

 detail as follows, commencing at the lowest lock : No. 48, from the Ohio 

 River, the lift is ten feet ; passing over the Loramie by an aqueduct, 

 Lock 49 has a lift of eleven feet ; the 50th and 51st have each a lift of 

 eleven feet; the 52d and 53d each tivelve feet — in all sixty-seven feet. 

 If the water in the bed of the river -at the county line is twelve feet be- 

 low the level of the canal, that would make the lowest point in the 

 county seventy-nine fe^t below the highest level of the canal; add one 

 hundred and thirty-four feet for the greatest elevation of any point in 

 the county above the canal, and we have the difference in level between 

 the lowest and highest points in the county, which is two hundred and 

 thirteen feet. This calculation includes the valley of the Miami. If 

 we leave this out of the calculation, the variation in level of the upland, 

 the larger p:irt of the county by far, would not be more than about one 

 hundred and twenty-five feet. 



The surface of the county, excluding the valley of the Miami, would 

 average about seventy-five feet above the water in the canal. Before the 

 water-courses had worn their channels in the drift, the surface nearly 

 level, sloped gently toward the south from the dividing ridge; north of 

 that line still less toward the north. 



The drainage is very simple. The water which falls on the surface of 

 the county is drained off by the Miami River and its tributaries, with 

 the exception of a strip north of the Kettler turnpike, of a width of 

 about two miles, and but little greater in the other dimension. This is 

 drained into the Maumee. The Miami flows from the county on the 

 south at a point about midway from east to west. Near this point it re- 

 ceives its most important tributary, the Loramie, coming from the north- 

 west, along whose course in the county the Miami Canal is conducted. 

 This tributary, besides performing an important part in the drainage of 

 the county, is immensely valuable in relation to the canal, the Laramie 

 Reservoir being formed in this stream. Coming into the county about 

 centrally on the north, a small stream, it moves sluggishly over the flat 

 district which forms the dividing ridge, and gradually moving its course 

 to the west, reaches a point in its journey far to the western part of the 

 county, where its course is turned to the south in connection with im- 

 portant accessions to its volume of water, cutting a decided channel and 

 receiving important accessions from both sides, it gradually returns east- 

 ward to raidwiiy of the county, where it debouches into the Miami. It 

 is in the upper pirt of its course, just where it leaves its sluggish niean- 

 derings on the high land of the watershed, that the important reservoir 

 which receives its name from the creek is situated. There is a descent 



