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State Highway 9 Iron Springs

Frisco, Colorado

Pedestrian Underpass/Wildlife Crossing

Installation:

August 2016

Technical Description:

• 2 - 31' x 12'-10 3/8" x 64' CON/SPAN® O-Series® Bridge Systems
• 1- 31' x 12'-10 3/8" x 152' CON/SPAN® O-Series® Bridge System

In order to address a capacity issue at the stretch of State Highway 9 between Frisco and Breckenridge, Colorado Department of Transportation (CDOT) made the decision to widen the road. The project also included flattening out the road alignment to address safety concerns and the maintenance of the bike path running between Frisco and Breckenridge.

The change in alignment was a major issue. Since the highway winds through Forest Service Land, the highway and associated underpass needed to provide safe passage for pedestrians along the trail and for wildlife to the nearby lake.

CDOT specified arches for for both economic and aesthetic reasons and after looking into alternatives, it was decided that the best solution was a 31' x 12'-10" CON/SPAN® O-Series® Bridge System for all three structures. Two of the structures serve as pedestrian tunnels under Highway 9. The third was utilized as a pedestrian tunnel during the phased construction of the realigned highway and later converted to a wildlife crossing. The arches were structurally efficient and therefore, very cost competitive with other options. Using a modular precast arch allowed each bridge to be completed in phased construction. The inherent shape of the CON/SPAN structure maximized the bottom width, while the flared legs made for smaller angles encouraging smaller animals to use the crossing as well.

Technical Description:

• 2 - 31' x 12'-10 3/8" x 64' CON/SPAN® O-Series® Bridge Systems
• 1- 31' x 12'-10 3/8" x 152' CON/SPAN® O-Series® Bridge System

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