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Supervisors direct legal and engineering follow-up after culvert collapse restricts drainage toward West Okoboji Harbor
Summary
County engineers reported a collapsed/deteriorated 72-inch culvert and a constricted outflow under Highway 86 that is pinching drainage for Drainage District 45; the board directed county legal and engineering staff to pursue options, including letters to the harbor board and coordination with DNR/DOT.
County engineer staff and consultant Ivan Simpson of Bolton & Menk told the Dickinson County Board of Supervisors on April 14 that a 72-inch corrugated metal culvert under Trade Wind Drive and a concrete box culvert under Highway 86 have been damaged and partially blocked, creating a pronounced "pinch point" that reduces outflow area and causes repeated ponding across Drainage District 45.
Simpson described the configuration: the state-installed box culvert under Highway 86 provides roughly 25'.5 square feet of inlet area; downstream, a 72-inch corrugated pipe initially provides about 28 square…
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