Gold Award – County Road 47, Weld County, Colo.

Contractor: Interstate Highway Construction*

Owner/ Engineer: Weld County Division of Engineering   

Reconstruction of Weld County Road 47 was the third and final phase in completion of the County’s Weld County Road 49 Corridor, providing a north-south alternate to 1-25 and US 85, the largest project designed completely in-house by the County.

County Road 47 from County Road 60.5 to State Highway 392 was an existing two-lane, 3.5-mile rural asphalt road with ditches on both sides. Now, the roadway includes four lanes, a continuous 16 ft. general purpose lane, acceleration and deceleration lanes at intersections, a median guardrail and a new irrigation system critical to farmers. More than 167,000 SY of concrete was used to pave 12.89 lane miles at a paving cost of $6.3 million in a project that cost a total of $21.2 million.

The project used a geogrid to mechanically stabilize the subgrade in lieu of the typically specified R-40 subgrade. A new fusion bonded epoxy that fully encapsulates dowel bars was used to provide steel corrosion resistance said to be on par with stainless steel bars. A cure/sealer was used on the concrete to promote sulfate resistance. All concrete aggregates were mined on-site, not only to meet the project demand, but also allow for the continual optimization of the mix design. A non-destructive pavement thickness system was used to determine the concrete thickness without coring into the concrete, thus reducing future maintenance issues.

Public traffic was detoured which allowed for the road to be completely closed for construction – providing a safe construction zone, while expediting the project schedule. Thanks to the hard work and innovative solutions used in this project, this section of County Road 47 reopened five months ahead of schedule.

* ACPA member.