APPENDIX A. 



291 



ST. MARY'S FALLS CANAL, MICH. 



(Between Lakes Superior and Huron.) 



COLBERT SHOALS CANAL, ALA. (TENNESSEE RIVER). 



Colbert Shoals Canal Lift lock. 



Location 29 miles west of Florence, Ala., at Riverton 



Pool above sea-level, feet 383.370 



Built on Rock 



Built of Cut masonry, chiefly limestone 



Completed Masonry, 1897 



Entire length, feet S5 r - 



Available length, feet 34- 



Clear width, feet 80.0 



L.ift, feet 26.0 max. 



Depth on upper miter-sill, feet 7.0 



Depth on lower miter-sill, feet 7- 



Height of wall above lower miter-sill, feet 36.25 



Height of wall above floor, feet 37- 



Material of floor Bed-rock 



Width of wall at floor, feet 21.5 



WiiHh of wall at coping, linear feet 5.0 



Type of gates Miter 



Material of gates Steel 



Operated by Machinery 



Location of filling-valves In walls 



Location of emptying-valves In walls 



Type of filling-valves Balanced butterfly (steel) 



Type of emptying-valves Balanced butterfly (steel) 



Number and size of filling-valves Two each 8 ft. X 10 ft. 



Number and size of emptying-valves Two each 8 ft. X 10 ft. 



Type of head-bay coffer None 



Type of tail-bay coffer Steel gates 



NOTE. Canal not yet available for commerce, being in course of construction (1902). 



