DES MOINES, Iowa, May 4 -- The Iowa Department of Natural Resources issued the following news release: * * * Diesel fuel spill reaches Little Walnut Creek in Dallas County WAUKEE - The Iowa Department of Natural Resources is investigating a diesel fuel spill at Little Walnut Creek in Dallas County. On May 3, the DNR Field Office in Des Moines was notified of a diesel fuel spill at an agricultural site near Dallas Center. An above-ground storage tank containing diesel fuel began leaking arou  more