Ka kammala wannan magana: A shekara ta 1958, rundunar injiniyoyi ta Amirka ta kammala aikin Dam na Coralville a bakin Kogin Iowa, mai nisan mil shida daga arewacin birnin, kuma ta kafa tafkin Coralville. Sai dai ga
Babban Ambaliyar 1993 da Babban Ambaliyar Iowa na 2008, madatsar ruwa ta taimaka wajen hana mummunar ambaliyar ruwa a cikin birni. Daga Yuni zuwa Agusta 1993, dukkanin manyan hanyoyin sufuri uku na Coralville tare da Iowa City sun nitse. Tasirin tattalin arziki a wannan shekarar ya kasance mai tsanani, amma birnin ya kusan dawo cikin shekaru biyu. Ambaliyar 2008 ta tabbatar da cewa ta fi tsada yayin da Kogin Iowa ya zarce tarihin 1993 a kan.