Minnesota Department of Transportation

511 Travel Info

Hwy 99 Minnesota River Bridge

St. Peter

Traffic impacts

I-494 Ramp Closures
Hwy 99 detour map. Click for larger PDF version.

Detour

Hwy 99 is detoured along Hwy 22 and Le Sueur CR 21

About this project


Hwy 99 project webcam
. Click for live view.

Summary of work

The historic Hwy 99 bridge over the Minnesota River near Saint Peter will be rehabilitated in 2017.

  • Strengthening of truss floorbeams
  • New concrete bridge deck and sidewalk
  • Abutment and pier rehabilitation
  • Complete repainting (dark green)
  • Riprap around pier abutments
  • New lights

History

Built in 1931, Bridge #4930 is a steel truss bridge over the Minnesota River on the east side of Saint Peter. This bridge is on the National Register of Historic Places and is one of 24 bridges selected across the state of Minnesota for special preservation.

The Hwy 99 Bridge is a fracture critical bridge located in the 100-year flood elevation with corrosion in the steel members and deterioration of concrete in the bearing support and parapet wall. It has a sufficiency rating of 47.1 and is inspected every year. Some repairs and rehabilitation have taken place in the 1950’s, 1960’s and 1980’s and most recently in 2009 the east and west abutments were repaired and the gusset plates repaired and painted. The 2010 fall floods damaged the railing and light pole. Historic Broadway Bridge website.

Key issues

  • Addressing the fracture critical requirements while preserving the historical nature and appearance of the bridge
  • Foundation and scouring issues
  • Reconstructing abutment around existing storm tunnel
  • Flooding during construction
  • Residential and business access during construction
  • Detour of Hwy 99 along Hwy 22 and Le Sueur CR 21

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