Iowa DOT News

UPDATED: Tell us what you think about a proposed roundabout at the intersection of IA 3 and IA 143 near Marcus in Cherokee County

AMES, Iowa – April 8, 2024 –The Iowa Department of Transportation is requesting your input on a for a proposed roundabout at the intersection of Iowa 3 and Iowa 143 near Marcus in Cherokee county.  



Iowa 3 traffic will be maintained by staging construction for most of the project. It is anticipated that Iowa 3 east of Iowa 143 will need to be detoured during the final stage of construction. The proposed detour for this stage would be Cherokee County roads L-36, C-38, and L-40. 

For part of construction, Iowa 143 and Cherokee County road L-36 will be detoured. When Iowa 143 is closed, traffic is proposed to be detoured on Cherokee County roads L-22, C-16, and L-40. When Cherokee County road L-36 is closed traffic is proposed to be detoured on Cherokee County roads L-22, C-38, and L-40. Construction is expected to begin in spring of 2026 and end in early fall of 2026.

If you would like to receive future emails about this project or submit a comment or question for this project, you can go directly to: Comments are due by Friday, April 19, 2024.

For general information regarding the public meeting, Shane Tymkowicz P.E., Assistant District Engineer, Iowa DOT District 3 Office, 6409 Gordon Drive, Sioux City, Iowa 51106, phone 712-274-5834 or 712-276-2822, email [email protected]

Please contact the person listed above if you need information in another language or if you need an interpreter. We will provide these at no cost to you.

Favor de notificar la persona listado arriba si necesita información en otro idioma o si necesita un traductor. Se lo proporcionaremos sin costo a usted.


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Iowa DOT ensures nondiscrimination and equal employment in all programs and activities in accordance with Title VI and Title VII of the Civil Rights Act of 1964 and other nondiscrimination statutes. If you need more information or special assistance for persons with disabilities or limited English proficiency, contact Iowa DOT Civil Rights at 515-239-1111 or by email at [email protected].


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