During the Great Flood of 1993 , the rising Mississippi temporarily made the Keokuk – Hamilton Bridge inaccessible from the Illinois side of the river ; later , gravel was layered over the threatened section of U.S. 136 to raise its level and keep the road and bridge accessible for the remaining flood period . More recently , during the 2008 Midwest floods , the Illinois access was again threatened , but this time gravel was applied and the road level raised before it was rendered completely impassable ; only temporary closings were required to allow road workers to complete the job . IDOT , ( Illinois Department of Transportation ) , and WL Miller Co. , a large concrete , quarry and asphalt company , put over 26,000 tons of rock on the eastbound lanes . The bridge approach was lifted about 4 – 6 feet in some areas . During the cleanup , some of the fairly new road was damaged , and IDOT is considering repaving the eastbound lanes from the bridge to Pats Pit Stop . During the Mississippi River Floods of 2019 , the bridge was once again closed
2008 Midwest floods
June 2008 Midwest floods
Keokuk–Hamilton Bridge