Infrastructre and Pavements

Flood-Recovery Bridge and Roadway Repairs
Town of Berthoud, Weld County, Colorado
Client: JVA Consultants, Town of Berthoud

At the southern bank of the Little Thompson River the approaches at both the County Road 1 and County Road 44 crossings were severely eroded during the flood events of September 2013. The bridge itself had been deemed structurally adequate, the southern approach to the bridge was destroyed. A large corrugated metal pipe (CMP) beneath the roadway was used as a cattle crossing had shifted and displaced substantially during the event. Based on the survey provided, the roadway surface in this area was approximately 10 to 15 feet above current grades at the bridge abutment. Repairs included installation of a new CMP cattle crossing, new cast-in-place concrete headwalls and wing walls, placement of earthen embankment/structure backfill fill soils, installation of rip-rap on the embankment slopes, and repaving of the approach to the southern end of the existing bridge.

Following the allocation of emergency funding to local agencies, JVA contacted our firm to be part of the team tasked with design and construction safe new approaches at each of the crossings. We commenced Geotechnical investigation in November 2013 to help provide emergency repairs later that year. We were brought on board in 2016 to provide final design services for extension of County Road 44 in order to extend the design life of the pavements and help economize the City’s funds.

Louisville Raw Water Line Relocation
Eldorado Canyon, Boulder County, Colorado
Client: JVA Consultants, City of Louisville

The City of Louisville owns and operates a raw water line which runs along the south/east side of Colorado State Highway 170, which leads into and out of Eldorado Canyon State Park. Due to installation of a new culvert beneath a segment of the highway and lowering of an existing natural gas main, the City’s water line needed to be relocated. In order to provide the design and construction team with the required information, it was necessary to perform geotechnical investigation at two locations along the alignment.

The CG team acquired the necessary State permits, coordinated traffic control and underground utility locating, and contracted the services of a limited-access, all-terrain rig capable of drilling in the limited shoulder space available in this narrow canyon. Based on the conditions encountered, we provided recommendations for safe and efficient excavation into the residual soils and decomposed granite encountered along the alignment. We also provided recommendations for the completion of project earthwork, including stabilization of wet soils and the processing and compaction of backfill to limit future backfill settlement.