I-70 Exit 203 Interchange Improvements Study in Frisco

About the Study

The project team will study improvements to I-70 between Frisco and Silverthorne, including CO 9 (Exit 203/Frisco) and CO 9 from Dillon Dam Road to the I-70 interchange. The goal is to make it safer for motorists to travel between Frisco and Silverthorne, and improve traffic flow at the Exit 203 interchange and nearby CO 9 intersection with Dillon Dam Road.

The area for this feasibility study is along I-70 from just west of the CO 9 interchange (Exit 203), to the northeast to the Silverthorne interchange (Exit 205). It also includes a portion of CO 9 commonly referred to as Summit Boulevard, from the CO 9 interchange (Exit 203) to just south of the intersection of CO 9 and Dillon Dam Road.

The three main areas of focus are:

  1. Eastbound third lane (auxiliary lane) between Exit 203 (Frisco) and Exit 205 (Silverthorne) on I-70
  2. CO 9 and I-70 interchange
  3. CO 9 and Dillon Dam Road intersection.

Note: Exit 205 (Silverthorne) is not included in this study.


In June 2011, the Federal Highway Administration (FHWA) signed and produced a high-level vision of the I-70 Mountain Corridor for the horizon year of 2050.

Additional studies—including this project—are needed to identify specific project alternatives, alignments and interchange types.