If you travel near the Interstate 35 and U.S. Highway 20 interchange in Hamilton County you need to be aware of some nighttime road closures that may slow down your trip, according to the Iowa Department of Transportation..

Crews need to replace several sign trusses at the I-35 and U.S. 20 interchange. To complete this project, crews will be closing the roadway under each of the trusses to safely and efficiently get the old ones removed and the new ones installed. When the roadway is closed portable message signs will be in place to assist you in traveling around the road closures.

Southbound I-35

• Crews will close southbound I-35 from Hamilton County Road D-25 (exit 144) to the I-35 and U.S. Highway 20 interchange (exit 142) from 8 p.m. Tuesday until 6 a.m. Wednesday, weather permitting.

• When southbound I-35 is closed, you will exit at Hamilton County Road D-25 (exit 144), travel west to U.S. Highway 69, travel south to U.S. 20, then drive east on U.S. 20 to reach southbound I-35.

Eastbound U.S. 20

• Starting at 7 p.m. Wednesday until 6 a.m. Thursday,, weather permitting, crews will close eastbound U.S. Highway 20 from U.S. Highway 69 (exit 149) east to the U.S. Highway 20 and I-35 interchange (exit 153).

• During this road closure you will exit U.S. Highway 20 at U.S. Highway 69 (exit 149), travel south on U.S. Highway. 69 to Hamilton County Road D-41, travel east to I-35 (exit 139), turn left onto northbound I-35, then exit onto eastbound U.S. Highway 20 at the I-35 and U.S. 20 interchange (exit 142A).

Northbound I-35

• Crews will close northbound I-35 from Hamilton County Road D-41 (exit 139) to the I-35 and U.S. Highway 20 interchange (exit 142A) from 8 p.m. Thursday until 6 a.m. Friday, weather permitting.

• When northbound I-35 is closed you will follow a marked detour route by exiting I-35 at Hamilton County Road D-41 (exit 139), travel east to Hamilton County Road R-77, turn left and travel north to U.S. Highway 20 where you will travel west to reach northbound I-35 (exit 153B).

If weather delays one of these road closures, it will be scheduled for the next night. No closures will occur from the evening of May 23 through May 26. Any rescheduled road closures will begin on the evening of May 27.