Coralville Reservoir pool expected to peak below spillway

Published June 3, 2013

IOWA CITY, IA – (June 3) Due to changing weather patterns and the lack of forecasted rainfall over Coralville Reservoir’s 3,115 square-mile watershed in north central Iowa, Coralville Lake is not expected to overtop the spillway.

Today, the Coralville Lake level is at 708.03 feet and will rise over the next several days. Inflow into the reservoir is expected to raise the pool level to approximately 710 feet on June 7. This level represents use of 88 percent of flood storage capacity with a pool level two feet below the spillway crest of 712 feet. The record high level at Coralville Lake was 717.02 feet on June 15, 2008.

The Corps expects to maintain outflows near 18,000 cfs to evacuate the water stored in the reservoir and to minimize downstream flooding. If additional unforecasted rainfall occurs within Coralville’s watershed, releases may need to be increased.

Coralville Reservoir inflow at 6 a.m., Monday, June 3, was 28,900 cfs with an average outflow of 18,160 cfs. At 2 p.m., today, Coralville is storing 305,630 acre feet of water (99.59 billion gallons) and is at 70.65 percent storage capacity.

Updated information about Coralville Reservoir is available on the Web by visiting

Release no. FY13-06-23