The lock and dam existed from 1878 to 1922, designed by William Emery Merrill and the U.S. Army Corps of Engineers.
In the Civil War, he served as assistant engineer in the Army of the Potomac during the Peninsular campaign and in the northern Virginia campaign, and from July, 1864, to September, 1865, commanded as colonel, a regiment of veteran volunteer engineers.
William Emery Merrill (1837–1891), American soldier and military engineer
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