by US Army Corps of Engineers, Omaha District on Friday, July 1, 2011 at 6:59pm
Omaha, Neb. — Runoff into the Missouri River Basin above Sioux City, Iowa during the month of June was the highest single runoff month since 1898.
June 2011 runoff into the Missouri River Basin above Sioux City was 13.8 million acre feet. The previous record was 13.2 maf in April of 1952.
The May 2011 runoff into the Missouri River Basin above Sioux City was 10.5 maf. This is the third highest single month runoff since 1898.
The May and June combined runoff totaled 24.3 maf, just short of the normal total annual runoff for the entire basin which is 24.8 maf.
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