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The average flow in 2016 was 11,680 cuft /s; the average annual flow during the period 1930-2016 was 11,910 cuft /s;. The highest average daily flow ever recorded on the Potomac at Washington, D.C., was in March 1936 when it reached 426,000 cuft /s. The lowest average daily flow ever recorded at the same location was 601.0 cuft /s in September, 1966