I-35W Interchange at County Road H

Client: Ramsey County
SEH #: 129594
Project Name: I-35W Interchange at County Road H – Traffic Analysis, Environmental Documentation, and Preliminary and Final Design

Interchange Background and History

The I-35W Interchange at County Road H provides access to areas in Mounds View, New Brighton, Shoreview and the 427 acre former Twin Cities Army Ammunitions Plant (TCAAP) site in Arden Hills, which Ramsey County took title to in April 2013. The County completed the site demolition and remediation in Fall 2015.

The existing interchange bridges over I-35W at County Road H and Hwy 96 have structural deficiencies and the Minnesota Department of Transportation (MnDOT) has planned for their reconstruction. The interchange of County Road 96 at I-35W was rebuilt in 2015 and the reconstruction of the County Road H interchange is underway. Ramsey County agreed to partner with MnDOT and is the lead on development and implementation of both interchange improvements projects.

In the fall of 2013, the county completed an Interchange Concept Development and Analysis of the County Road 96 and County Road H interchanges at I-35W in order to explore interchange configurations and refine project cost estimates. The study included analysis of several types of interchanges at County Road 96 and at County Road H. Based on the analysis, the preferred interchange concept for the I-35W at County Road H interchange was an improvement that largely maintains the existing interchange configuration north of County Road H, and adds a northbound exit ramp from I-35W to County Road H.

I-35W Interchange at County Road H Project

Ramsey County selected the SEH consultant team to prepare Traffic Analysis, Environmental Documentation, and Preliminary and Final Design for the I-35W Interchange at County Road H. The team produced bid documents for the 2016 construction project.

Project Partners

  • Ramsey County Public Works Department
  • Federal Highway Administration (FHWA)
  • Minnesota Department of Transportation (MnDOT)
  • City of Mounds View
  • City of Arden Hills
  • Rice Creek Watershed District (RCWD)

Project Funding

The County received $29 million in state funding from the 2014 legislature to provide for pre-design, design, and construction of improvements for the redevelopment of the TCAAP Site. This request included the interchanges on I-35W with County Road 96 and County Road H as well as a four-lane spine road through the TCAAP Site. State funds were combined with state trunk highway funds and local funds (County State Aid Highway (CSAH), county turnback and city funds) to fully fund the planned improvements.

Project Schedule

Develop Concept Layouts – Fall/Winter 2014
Public Open House – December 2014
Municipal Consent – Winter 2014
Approved Preferred Layout – Early Spring 2015
Final Design Complete – Fall 2015
Construction Began – May 2016


Beth Engum, PE
Project Manager, Ramsey County Public Works

Transportation Project Manager
Jeff Rhoda, PE