The U.S. Army Corps of Engineers, Rock Island District, is now managing Coralville Lake under operational parameters outlined in a recently approved updated Water Control Plan. This plan was the result of a feasibility study initiated to update the Iowa River Basin Master Reservoir Regulation Manual. The Water Control Plan consists of operational parameters defining how, and when, water is stored and released. It includes a schedule of releases, conservation pool levels to be maintained during non-flood or drought conditions, and downstream water level constraints.