CDOT and Hamon Infrastructure replaced the structurally deficient bridge that carried US 6 traffic over Garrison Street in Lakewood, Colorado. The work on this bridge was procured as a Streamlined Design-Build Project. The Streamlined Design-Build process encourages innovation and delivers a fast, standardized, and efficient procurement solution for both CDOT and for the design-build industry. This construction project has been completed.
Background
The previous bridge structure on US 6 over Garrison Street had been deteriorating and had been rated as “poor” with a sufficiency rating of 32 out of 100. The original structure was built in 1962 and widened to the center in 1972. The new bridge has a 75-year-design life and improves the safety of intersection as well as provides a number of community benefits.
Project Benefits
Increased driver safety due to improved sight distances on US 6.
Improved pedestrian access and safety due to new sidewalks and bike-lanes along Garrison Street.
Improved traffic flow at the intersection of US 6 and Garrison Street as a result of signal improvements.
Aesthetic enhancements which included new architectural walls and an improved bridge design.
Added lighting for pedestrians and bicyclists under the bridge will improve safety and contribute to the beautification of the intersection.
Improved drainage to provide safety and aesthetic benefits.
Environmental Highlights
The US 6 Over Garrison project Removed, Processed, and Recycled 26,000 tons of the existing 6th Ave pavement and placed it as Road Base for the new EB and WB 6th Ave. at Garrison. This process was developed with CDOT during the Alternative Technical Concepts phase of the Streamline Design-Build, containing unique Quality Control Procedures.
The Brannan HMA asphalt mix contained approximately 25% or 2,600 tons of recycled asphalt
The US 6 Over Garrison project removed, processed and recycled 6,300 cubic yards of old concrete from the old bridge, and 6th Ave.
The US 6 Over Garrison Project recycled 176,300 LBS of steel locally (Evraz Rocky Mountain Steel)
During the ATC processes the development and reuse of the existing cast-in-place walls as temporary shoring areas to complete the new walls kept 1800 truck roundtrips off Denver highways.
