Woodbury County mulls addition of riprap to Little Sioux River b - KTIV News 4 Sioux City IA: News, Weather and Sports

Woodbury County mulls addition of riprap to Little Sioux River bank to mitigate flooding

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? "The Corps has calculated that it doesn't have an adequate cost benefit ratio to justify their expense on taking care of it," said County Engineer Mark Nahra. ? "The Corps has calculated that it doesn't have an adequate cost benefit ratio to justify their expense on taking care of it," said County Engineer Mark Nahra.

Woodbury County officials say a river renovation near Smithland has to happen sooner or later, or flooded farm land could be in the future.

The Board of Supervisors is looking at armoring about 1,800 feet of the Little Sioux's southeast river bank with riprap to prevent erosion.

County officials say 2011 flooding ate away some of the bank and the riprap would prevent future wear.        

Cost is a concern. Depending on the type of riprap used, supervisors say the project could be upwards of $80,000.

To pay, the county is weighing options like levying a tax on the drainage district, or using "riverboat" funds. Officials asked the Army Corps of Engineers for help, to no avail.

"The Corps has calculated that it doesn't have an adequate cost benefit ratio to justify their expense on taking care of it," said County Engineer Mark Nahra.

County leaders say they'll get some help if they proceed. One landowner in the area has promised a $30,000 commitment to the project.

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