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CSAH 112 Reconstruction

CSAH 112, formerly TH 12, was originally constructed as part of the state’s trunk highway system. In the mid to late 2000s, MnDOT built the TH 12 bypass and returned jurisdiction of old TH 12 (Current CSAH 112/Wayzata Boulevard) to Hennepin County. A former trunk highway, the roadway was primarily designed for efficient traffic movement through the corridor and did not adequately address many local priorities such as pedestrian mobility and safety, parking, bicycle trail connectivity, and access.

In 2012, Hennepin County hired SRF to provide preliminary design, permitting, final design, public Involvement, and construction support services for the corridor. Preliminary design included:

  • Concept roadway and trail design for the four-mile-long corridor
  • Preliminary water resource design
  • Public Involvement
  • Environmental documentation and permitting
  • Right of way needs identification
  • Preliminary layout preparation

Final design included the preparation of two separate state-aid level plan sets for phases 1 and 2 of this project. The final design included significant coordination with the County, two municipalities, multiple sub-consultants, and project stakeholders such as business organizations on the corridor. Specific features of the final design included:

  • Lake shore stabilization and RSS wall
  • Maintenance of traffic
  • Applied flexible design standards to incorporate an additional center turn lane into the existing two-lane roadway, minimizing the Right-of- way impacts of this addition.
  • Added safety improvements including walks, trails, pedestrian ramp upgrades, and lighting.

SRF continued our role on the project by assisting the County during the construction phase of the phase 1 project. Our role included providing shop drawing review, design support, and construction observation


Hennepin County
Long Lake, Minnesota
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