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I-70/SH-58 Ramp 1 Flyover Design

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The original interchange at I-70 and SH 58 was constructed in 1968. And since then, it has operated without the ramps from eastbound I-70 to westbound SH 58 and from eastbound SH 58 to westbound I-70. To address this issue, the Colorado Department of Transportation (CDOT) commissioned the design of new ramps to alleviate traffic on local arterials. As originally designed by another firm, the bridge featured curved, precast concrete girders with unique detailing.

Working in concert with CDOT and the contractor, Summit Engineering Group (Summit) value-engineered the design to feature details and cross-sections similar to those developed for previous projects. This approach provided efficiencies to both the contractor and precaster, which helped meet the numerous construction challenges presented by the difficult urban site. The 11-span bridge crosses Clear Creek, a bike path, 3 traffic openings, eastbound and westbound I-70, and eastbound SH58. The structure includes the state’s longest span using constant depth, precast concrete U-girder construction. Summit was awarded the 2014 “Henry Hansen Industry Advancement Award” for this bridge by the Precast/Prestressed Concrete Institute.

Bridge Geometry
Length of Main Span 235 Feet
Total Project Length 2,115 Feet
Lanes on Structure One

This interchange improvement project will greatly improve safety, mobility and access for commuters and members of this community.

-Pam Hutton, Chief Engineer, CDOT