Pedzisa mashoko anotevera: Muna 1958, United States Army Corps of Engineers yakapedza kuvaka dhamu reCoralville riri pedyo neRwizi rweIowa, makiromita matanhatu kuchamhembe kweguta racho, richigadzira Lake Coralville. Kunze kwe
Mafashamo makuru a1993 uye mafashamo makuru eIowa a2008, dhamu rakabatsira kudzivirira mafashamo makuru muguta. Kubva muna June kusvika muna August 1993, migwagwa mikuru mitatu yokufambisa yeCoralville neIowa City yakanyura. Kukanganiswa kwezvoupfumi mugore iroro kwakanga kwakakomba, asi guta racho rakanga rava kunyatsozvigadzirisa mukati memakore maviri. Mafashamo a2008 akabvumikisa kuva anodhura zvikuru sezvo Rwizi rweIowa rwakapfuura mwero wenguva dzose wa1993 pakapfuura.