File:Locks And Dam No 41 Navigation Chart From 1934.jpg
Diagram of Locks and Dam No. 41 (renamed McAlpine Locks and Dam in 1960), Portland Canal and Falls of the Ohio
The dam then had a navigable pass and long sections of movable dam (Boule weir) which were replaced with fixed weir when the 1964 dam was built
Ohio River at Louisville, Kentucky
The dam then had a navigable pass and long sections of movable dam (Boule weir) which were replaced with fixed weir when the 1964 dam was built
Ohio River at Louisville, Kentucky
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