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Photo of Potomac River flooding at Dam 4, 1936 Flood

Dam No. 4 received serious damage during the flood. Earlier on February 27 an ice drift had carried away a section of the dam near the Maryland abutment. The March flood widened the break, and when the water subsided it was found that the gap started at a point about 45 feet from the Maryland abutment and averaged 55 feet in width. The guard bank at the dam was little damaged, but the cross bank at the nearby stop lock was more seriously affected. Both approaches to Guard Lock No. 4 were destroyed. The lockhouse at Lock No. 41, which had withstood the 1889 freshet, was swept away.