Corps of Engineers to Increase Coralville Lake Outflows

Published May 24, 2019
Coralville Lake Outflow

Coralville Lake Outflow

IOWA CITY, Iowa – The U.S. Army Corps of Engineers Rock Island District is temporarily increasing outflows at Coralville Lake from 6,000 cubic feet per second (cfs) to 10,000 cfs to expedite evacuation of flood waters from the reservoir. Seasonal constraints, typically used to reduce flood crests downstream, have also been raised from 14 to 19 feet at Lone Tree, Iowa, and from 21 to 25 feet at Wapello, Iowa, to assist in maintaining flood storage capacity within the reservoir.

Recent rainfall on already saturated soils has resulted in high inflows into Coralville Reservoir and an extended period of rainfall is forecast for the state of Iowa in the coming weeks. For more information on Coralville Lake, visit

Corporate Communications

Release no. 19-021