Missouri River Flood of 2011: Transportation Impacts
In 2011, repeated rounds of heavy rain, coupled with record plains snow-pack runoff, pushed the Missouri River reservoirs to historic levels. Record level releases flooded downstream properties and engulfed Iowa's roadways from June through early October.
- In 2011, repeated rounds of heavy rain, coupled with record plains snow-pack runoff, pushed the Missouri River reservoirs to historic levels. Record level releases flooded downstream properties and engulfed Iowa's roadways from June through early October.
- From the beginning to the end of the months of flooding, release rates from Gavins Point Dam were the key to flood levels downstream and impacts to the transportation system.
- On June 1, the first state highway in Iowa was impacted when the I-29/Hamilton Boulevard interchange in Sioux City was closed.
- Some of the early signs of what was to come were seen along Iowa 2 between I-29 in Iowa and Nebraska City, Neb. Water was starting to slowly creep over the highway in early June. One eastbound lane of Iowa 2 was closed June 7.
- In Iowa, the battle against the rising Missouri River stretched from Hamburg in the south near the Missouri state line and Sioux City in the north at the South Dakota state line. In early June, preparations were being made in communities all along the river.
- Sioux City continued to brace for the flooding as more properties were consumed.
- Some areas along the Missouri River are unprotected by levees. Levees that do exist are owned by the U.S. Army Corps of Engineers, private citizens and local level system managers. The months of pressure on the levee systems make them all vulnerable to breach.
- Hamburg, Iowa, prepared for what was forecast to be a full levee breach along an already weakened levee system along the Missouri River.
- As communities like Hamburg braced for the flooding, record water flow continued from the Missouri River dams.
- By June 9, the flood waters along Iowa 2 near Nebraska City were narrowing the open lane of eastbound travel.
Did you find this story interesting? Be the first to like or comment.