I-70/Dotsero Interchange

Dotsero, Colorado

The I-70 Frontage Road interchange over the Colorado River at Dotsero is a $7.3 million “green” bridge replacement. Tsiouvaras Simmons Holderness was tasked with realigning a portion of the two-lane I-70 Frontage Road (US 6) including a bridge replacement, roundabout design, grading, drainage, lighting, signing, and striping. A roundabout was selected for the ramp intersection to address sight distance issues resulting from the new bridge alignment. This project was CDOT’s first successful transportation CMGC project, with a GMP (Guaranteed Maximum Price) obtained in the first iteration.

  • Bridge hydraulic analysis and scour estimation for 100-year and 500-year flow rates of 21,650 cfs and 25,933 cfs
  • Revetment design for protection of east abutment and roadway