Minnesota Department of Transportation

511 Travel Info

Hwy 169, Hwy 22 Minnesota River Flood Mitigation

Mankato, Saint Peter

2015 - Hwy 22 south of St. Peter Project Information Available

Environmental documents available Dec. 22; Public open house Jan. 8

A combined Federal Environmental Assessment and State Environmental Assessment Worksheet (EA/EAW) will be available for public and agency review and comment beginning Dec. 22, 2014. The EA/EAW identifies the project purpose and need, alternatives considered, and identifies potential social, economic, and environmental effects. The EA/EAW is available for review here and at the following locations:

  • Saint Peter Library, 601 S. Washington Avenue, Saint Peter, MN 56082
  • Blue Earth County Library, 100 E. Main Street, Mankato MN 56002
  • MnDOT District 7 Office Building Lobby, 2151 Bassett Drive, Mankato, MN 56001
  • Minneapolis Public Library, Technical & Science Division, Government Docs.,2nd Floor, 300 Nicollet Mall, Minneapolis, MN 55401-1992
  • MnDOT Library, 395 John Ireland Boulevard, St. Paul, MN 55155

A public informational meeting has been scheduled for Thursday, Jan. 8, 2015 at the St. Peter Community Center – Senior Room, 600 South 5th Street, St. Peter MN 56082. The open house style meeting will be held from 4:30 to 6:30. MnDOT representatives will be present to answer questions.

The deadline for submitting comments is January 21, 2015. All comments should be directed to: Zachary Tess, MnDOT Project Manager, 2151 Bassett Drive, Mankato, MN 56001, zachary.tess@state.mn.us

Traffic impacts

Expect a detour in 2015 for Highway 22 flood mitigation project.

Motorists using Hwy 169 to access St. Julien Street and Hwy 22 in the St. Peter area are using a re-designed intersection (Reduced Conflict Intersections) for improved safety now that the 2014 project is complete.

Hwy 169 intersection designsflood mitigation overview map

Driving Graphics

Why Reduced Conflict Intersections?

Reduced Conflict Intersection. RCIs are intersections that decrease fatalities and injuries caused by broadside crashes on four-lane divided highways. In some parts of the country, RCIs are sometimes referred to as J-turns or RCUTs. Learn more about how they improve safety and how to drive them in the video below.

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