j3 4 THE IMPROVEMENT OF RIVERS. 



LOUISVILLE AND PORTLAND CANAL, KY. 



Location Louisville, Ky. 



Number Two locks, adjoining 



Mil.-s from Louisville a| 



I'. ..,1 above sea-level Zero of gauge, 398.5 feet 



Built on Limestone bed-rock 



Built of Sandstone and concrete 



(Vmi>leUil l8 73. by the United States; purchased from 



the Louisville and Portland Canal Co.; 



commenced in 1860 



Extreme length, feet 744 



Available length, feet 335 between miter-sills 



Clear width, feet 80.0 



Lift Total, 24 feet ; upper chamber, 14 feet; lower 



chamber, 10 feet 



Depth on upper miter-sill, feet Lowest stage, 6.73; highest, 17.68 * 



Depth on lower miter-sill, feet Lowest stage, 4.8 



Height of wall above lower miter-sill, feet 26.24 



Height of wall above floor, feet 28.24 



Material of floor Bed-rock 



Width of wall at coping, feet 8 



Type of gates Miter, bowstring trusses 



Material of gates Oak and yellow pine 



Operating power Steam or hand 



Location of filling-valves Gates 



Location of emptying- valves Gates 



Total gross area of filling-valves 9 sq. ft. each, 6 to each gate; total, 108 sq. ft. 



Total gross area of emptying-valves 9 sq. ft. each, 6 to each gate; total, 108 sq. ft. 



Type of filling-valves Butterfly, vertical balanced 



Type of emptying- valves Butterfly, vertical balanced 



Number of men employed Operating force, 9 men, 2 shifts; total, 18 



men per 24 hours 



Wages of men employed $1060 . oo per month 



Original cost Not known 



* Above this stage the lock is closed to navigation. 



NOTB. The dam is formed by the "Falls of the Ohio," the natural configuration of the river-bed. 





