The Iowa Department of Natural Resources is investigating a fertilizer spill Monday in the City of Burlington in Des Moines County. The D-N-R says a 700 gallon plastic tank containing fertilizer fell off a truck and an unknown amount of the fertilizer spilled onto the street and continued into a nearby storm sewer which discharges into Hawkeye Creek. D-N-R staff later observed fertilizer contamination at Hawkeye Creek, which flows through the City of Burlington to the Mississippi River. No dead fish have been found and the the D-N-R is working with the City of Burlington to address the fertilizer impact before entering the Mississippi River.