Iowa River Rip Rap
The Oakville Breach Armoring project was designed to reinforce and protect a large section of main stem levee along the Iowa River at Oakville from wave action and erosion particularly during future high water events. A significant portion of the original levee was lost during the record high flood of 2008 on the Iowa River. The new levee was setback away from the river and constructed by the Corps in 2010.
Funding for this armoring project came from the Community Development Block Grant funding left over from the unused flood buyout monies from the 2008 flood that were previously allocated to Louisa County, and more specifically, Oakville, Iowa. The owner was required to provide a financial match to meet the requirements of the CDBG grant. The design and permitting for the project were completed in 2013, and the construction was initiated and completed in 2014. This project was part of a larger levee improvement project along the Iowa River near Oakville as a result of the damage done during the 2008 flood.
The work consisted of placement of approximately 12,300 CY of bedding stone and over 40,500 CY of IaDOT Class B revetment with a 650 lb top size meeting the most stringent USACE freeze/thaw criteria for nonsubmerged placement. The newly place armoring protects approximately 7,200 LF of levee through a sharp bend in the Iowa River. The project was design to utilize precise placement techniques with GPS machine grade control equipment. The contractor was Fye Excavating of Sperry, IA. The owner, Two Rivers Levee & Drainage District, were very pleased with the outcome of the project and the additional protection that it affords the local community.