MoDOT - Missouri Department of Transportation

12/11/2025 | Press release | Distributed by Public on 12/11/2025 12:27

MoDOT to close Route A ramp to NB I-55 in Jefferson County overnight Friday

JEFFERSON COUNTY - Drivers who use Route A to access northbound Interstate 55 should be aware the ramp will close overnight Friday, December 12 for bridge construction.

Weather permitting, crews will close the ramp from Route A to northbound I-55 as well as the right lane of northbound I-55 Friday, December 12, from 9 p.m. to 5 a.m.to set girders for the I-55 bridge over Third Street.

A signed detour will direct traffic around the closure. Drivers can take U.S. Route 61/Route 67 north toward Herculaneum, take a left onto McNutt Street and take the ramp on the right side of McNutt to enter northbound I-55.

For additional information about current and upcoming detours and project status, please visit the I-55 Corridor Improvement project website at: Interstate 55 Corridor Upgrades in Jefferson | Missouri Department of Transportation (modot.org).

For up-to-date traffic and travel info, motorists can check MoDOT's Traveler Information Map at http://traveler.modot.org/map/.

MoDOT - Missouri Department of Transportation published this content on December 11, 2025, and is solely responsible for the information contained herein. Distributed via Public Technologies (PUBT), unedited and unaltered, on December 11, 2025 at 18:27 UTC. If you believe the information included in the content is inaccurate or outdated and requires editing or removal, please contact us at [email protected]