Project Name: Willow Creek/Boyer River Flood Risk Management Study
Location: Missouri Valley, Iowa
Authority: Section 205 of the Flood Control Act of 1948, as amended
Sponsor: City of Missouri Valley
Current Phase: Feasibility
The city of Missouri Valley (non-federal sponsor) is partnering with the U.S. Army Corps of Engineers (Omaha District) on a feasibility study to evaluate possible flood risk management solutions along Willow Creek and the Boyer River in Missouri Valley, Iowa.
Missouri Valley, including large areas between Interstate 29 and the bluff line north of Highway 30, is subject to frequent flooding from Willow Creek and the Boyer River. Willow Creek, a tributary of the Boyer River, flows along the west side of Missouri Valley while the Boyer River flows along the east and south sides of the city.
Levees along these stretches are non-engineered spoil banks that have been evaluated by the Corps but not certified and only provide a 10-year level of flood risk reduction. In May 2007 during a high flow event, spoil bank levees along Willow Creek failed upstream of Missouri Valley and flooded homes and businesses contributing to an estimated $3 million in damages. During a September 2014 high flow event, a spoil bank levee along the Boyer River breached approximately two miles east of Missouri Valley near U.S. Highway 30. Roughly 70 people along a four-block stretch were forced to evacuate.
The feasibility study is being conducted under Section 205 of the Flood Control Act of 1948 which allows the Corps to construct projects to reduce damages caused by flooding. During the feasibility phase, the Corps will ask the public for its input on the project and conduct a variety of detailed environmental, economic, and engineering analyses to develop possible solutions that are beneficial to the public, economically viable and environmentally acceptable.
Project Update: The Omaha District and city of Missouri Valley hosted a public scoping meeting on Thursday, September 10, 2015 at the Rand Community Center in Missouri Valley, Iowa. Public comments on the study are due by October 9, 2015. Comments can be emailed to firstname.lastname@example.org.