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Engineers present preferred ‘skewed roundabout’ for Highway 141/Towner Drive interchange; cost opinion about $28M
Summary
Snyder & Associates presented a preferred skewed roundabout interchange for Iowa Highway 141 at Towner Drive, citing crash history and projected traffic growth and offering an updated cost opinion of about $28 million and a potential construction start as early as 2028 if funding is secured.
Wade Greiman, a transportation engineer with Snyder & Associates, presented planning and environmental linkage (PEL) study findings and alternatives for a proposed interchange on Iowa Highway 141 at Towner Drive.
Greiman said traffic along the corridor rose from about 25,000 vehicles per day in 2016 to nearly 33,000 in 2023 and that projections range from roughly 50,000 to 62,000 vehicles per day by 2050. He said crash analysis for 2019–2023 identified 47 crashes at study intersections, 42 crashes in the segments between intersections, 13 injuries and one fatality; that crash pattern and operational concerns…
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