SIKESTON – The Missouri Department of Transportation will begin major construction with lane and ramp closures at I-55 and Route Z in Jefferson County beginning the weekend of June 19
Beginning at 8 p.m. Friday, June 19, MoDOT will shift southbound I-55 traffic onto newly constructed median pavement north of Route Z to north of the Joachim Creek bridge.
Once SB I-55 traffic is shifted off the current bridge, Route Z will close under Interstate 55 and the southbound I-55 bridge over Route Z will be demolished.
Route Z will open up to one lane each direction no later than Monday, June 22 at 5:00 a.m. Once Route Z is reopened, the southbound I-55 exit ramp to Route Z will close for four months and the Route Z entrance ramp to southbound I-55 will close for five months.
https://www.modot.org/node/90947