Overnight Closures around the Southwest Mixmaster begin Sunday night, Oct. 18

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WEST DES MOINES, Iowa — Oct. 16, 2026 — If you drive on I-35, I-80, and I-235 around the Southwest Mixmaster you need to be aware of overnight road and ramp closures that may slow down your trip, according to the Iowa Department of Transportation’s District 1 office. 

In order to perform various work around the Southwest Mixmaster, the following closures are planned:

Sunday, Oct. 18 and Monday, Oct. 19

  • Double lane closures on westbound I-235 east of 50th Street then a full closure west of the northbound I-35 ramp to Grand Prairie Parkway each night from 9 p.m.–5 a.m.
Detour map for closures on October 18 and 19

Detour map for closures on October 18 and 19

Tuesday, Oct. 20 and Wednesday, Oct. 21 and Thursday, Oct. 22 

  • From 9 p.m.–5 a.m., the following ramps will be closed:
    • Westbound I-235 to southbound I-35
    • Northbound I-35 to westbound I-235
    • Westbound I-235 to northbound I-35
    • Westbound I-235 to 50th Street
  • There is also a full closure of northbound I-35 between Mills Civic Parkway and Mixmaster from 10 p.m.–4 a.m. (Tuesday and Wednesday only)
Detour map for closures on October 20 to 22

Detour map for closures on October 20 to 22

Friday, Oct. 23 

  • From 9 p.m.–5 a.m., the following ramps will be closed:
    • Northbound I-35 to eastbound I-235
    • 50th Street eastbound entrance ramp
Detour map for closures on October 23

Detour map for closures on October 23

The Iowa DOT reminds motorists to drive with caution, obey the posted speed limit and other signs in the work area, and be aware that traffic fines for moving violations are at least double in work zones. As in all work zones, drivers should stay alert, allow ample space between vehicles, and wear seat belts.

The latest traveler information is available anytime through our 511 system. Visit 511ia.org; call 511 (within Iowa) or 800-288-1047 (nationwide); stay connected with 511 on Facebook or X (find links at https://iowadot.gov/travel-tools/iowa-511/511-social-media-sites); or download the free app to your mobile device. 

It’s easy to subscribe to Your 511 and sign up to receive email/text alerts. Visit https://new.511ia.org/#login to sign up. For instructions and help with this feature, visit https://www.511ia.org/help/section/how-to-create-and-manage-a-511-account.html.

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For questions about this project contact Kasi Province, Grimes Construction office, at 515-986-2863 or [email protected].