Buena Vista County pushes back on DOT over Platinum Crush road costs

Buena Vista County is still waiting for the Iowa Department of Transportation to settle the final terms on the Highway 7 and 70th Avenue intersection, and the unanswered questions now center on cost, design control and who is responsible for the next step. At Tuesday’s board meeting, supervisors approved sending a formal response that pushes back on DOT design changes made after the state took over the work earlier this year.

County Engineer Bret Wilkinson told supervisors the DOT asked how much the county is willing to contribute. The county’s draft reply says the state’s changes have driven the estimate above what Buena Vista County expected, even though the county had believed the DOT would assume full responsibility once it stepped in to handle the project. Board Chair Paul Merten said the original 2022 RISE grant split the project costs evenly, but the county now faces a more expensive proposal and a need to clarify who pays what before construction can move ahead.

The county is holding to a proposed contribution of about $1.4 million, roughly the amount of remaining RISE funds. Even that option would force Buena Vista County to borrow money up front and wait for reimbursement through tax-increment revenue tied to Platinum Crush, the soybean-processing plant east of Alta. Supervisors voted unanimously to authorize Merten to sign the letter and Wilkinson to send it.

The dispute lands on top of a long-running road program meant to keep truck traffic moving safely into the Platinum Crush site and protect nearby roads around Storm Lake, Alta and Lake Creek. In September 2025, Wilkinson outlined a plan that included a 550-foot eastbound turn lane at 70th Avenue and raising the intersection by about a foot to improve truck approach angles and sight distance. On October 8, 2025, supervisors backed Alternative One and rejected Alternative Three in the redesign. Residents near Villa Road and the Buena Vista University Golf Course have already pressed concerns about safety, drainage and property impacts.

The county and DOT have been working through those issues for months. On January 20, 2026, supervisors approved an addendum that shifted responsibility for the Highway 7 and 70th Avenue work to Iowa DOT District 3. On March 26, 2026, they approved a pre-construction agreement for Phase 3 that said the DOT would design, let and inspect the state-controlled portions of the project. By November 2025, the county had already held a railroad diagnostic meeting with the DOT and Canadian National Railway, and DOT engineers recommended nine-inch raised medians at the crossings to keep drivers from going around the arms.

The stakes are bigger than one intersection. Phase 2 is already moving with a low bid of just over $2.39 million from Peterson Contractors Inc. of Reinbeck and $3.135 million in capital loan notes approved by the county, with repayment tied to a 20-year TIF arrangement with Platinum Crush. That phase is supposed to be finished by September 15, 2026. If the county and DOT cannot lock down the 70th Avenue work soon, nearby residents will stay in limbo, truck access will remain constrained and Buena Vista County’s ability to keep the Platinum Crush buildout on schedule will remain tied up in the same unresolved road fight.