Minnesota Department of Transportation

511 Travel Info

Hwy 169, Hwy 22 Minnesota River Flood Mitigation

Mankato, Saint Peter

Traffic impacts

Attn: July 28 meeting to discuss possible changes to traffic and schedule

MnDOT is hosting a public meeting from 4:30 to 6:00 p.m. at the St. Peter Community Center on Monday, July 28 to discuss a proposal to detour Highway 169 traffic to recover from the four week delay, partially caused by the recent floods. The goal of the proposed changes to the schedule below is to finish the work this construction season.

Lane closuresflood mitigation overview map

Please drive with caution and slow down in work zones. All businesses will remain accessible throughout the project.

  • From mid-July to late August, traffic will be restricted to two lanes on Hwy 169, two-way in the southbound lanes from St. Peter to Roberts Creek and two-way traffic in northbound lanes from Roberts Creek to north of the Cambria silo.
  • From August through the Fall, all traffic will shift from southbound to northbound lanes and during the fall, traffic will switch to one lane on each northbound and southbound from St. Peter to Roberts Creek and two-way traffic in northbound from Roberts Creek to north of the Cambria silo.

2014 work

  • Raise grade and reconstruct two miles of Hwy 169 (southbound lanes only)
  • Preserve/resurface nine miles of Hwy 169 (southbound lanes only)
  • Revise access to city of Saint Peter (north and southbound lanes)
  • Print 2014 project timeline (PDF)

About this project

Summary of work

This project involves raising Hwy 169 and Hwy 22 one foot above the 100-year flood elevation to maintain traffic during high water events. When these highways were originally constructed in the early 1960’s, the Minnesota River high-water elevation was assumed at 751 and the roads were constructed accordingly. The actual 100-year flood elevation in this area ranges from about 756.0 to 756.6. View project overview map (PDF).

Key issues

  • Unsuitable soils in reconstruction areas
  • Impacts to 6(f) environmental properties of Seven Mile Creek and Riverside Park
  • Coordination with rehabilitation of Hwy 99 bridge over Minnesota River at Saint Peter
  • Management of traffic during construction and access to businesses during construction


Cost estimate (millions) 2014 2015 2016
Construction 10.7 2.5 22.6-26.7
Construction-related costs 1.1 0.15 1.6-1.9
Engineering 1.5 0.5 4.5-5.3
Right of way 0 0.05 0.1
Total $13.3 $3.2 $28.8-$34