File:Locks and Dam No 41 navigation chart from 1934.jpg

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Description
English: Locks and Dam No. 41 navigation chart
Louisville, Kentucky
Date
Source The Ohio River, Fifth Edition (1935), p.208
Author War Department, Office of the Chief of Engineers

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

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Public domain
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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