Corps to Increase Outflows at Coralville Lake

Published Oct. 10, 2018
Corps of Engineers to Increase Coralville Lake Outflows

IOWA CITY, Iowa – The U.S. Army Corps of Engineers, Rock Island District, will temporarily increase the outflows at Coralville Lake in accordance with the water control plan. The increase, which is planned for later today, takes outflows from 10,000 to 12,000 cubic feet per second (cfs).


The increase is needed due to recent heavy rainfall in the Iowa River Basin and subsequent lake levels at Coralville Lake. The lake level was using 75 percent of the available flood storage as of Wednesday morning and is expected to crest Monday, October 15, using 90 percent of the available flood storage.    The 12,000 cfs will be held until the lake level falls over 1 foot per day.  At that point, reductions in outflow are necessary to maintain the 1 foot per day recession in the lake.


Updated information about Coralville Lake levels, Iowa River flow and projected rainfall amounts is available at


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Allen Marshall
(309) 794-5204

Release no. 18-062