Iowa River near Wapello, Iowa


Corps of Engineers outflow trigger:

When the Wapello gage is projected to exceed 22 ft (before May 1)/ 21 ft (after May 1), COE written policy is to reduce the outflow of the Coralville reservoir down to as low as 1000 cubic feet per second for up to 3 days in order to keep the crest below the threshold.


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