Civil Engineering

Featured Project

City of Moscow US95 Underpass Project

Alta was first contracted by the City of Moscow in 2014 to perform a project feasibility study. Alta collected site survey and completed the hydrologic estimating for Paradise Creek in the project reach. Hydraulic modeling was a crucial component of this project; it allowed Alta to determine if there was enough capacity in the bridge cross-section to construct the pathway underpass while still meeting no-rise criteria and maintaining adequate freeboard. Alta presented the results to the City as a feasible (albeit challenging) project in a report with conceptual drawings and costs.

The City of Moscow proceeded with the project in 2017, and Alta was contracted for the final design. Alta used our vehicle-mounted LiDAR unit to collect survey along White Avenue to be combined with the creek survey. The LiDAR data helped Alta engineers determine the pathway horizontal alignment and vertical profile and design path transitions, curbs and gutters, ADA compliant pedestrian ramps, and crosswalks. The underpass design includes an LED-lighted 10-foot wide concrete path supported by concrete block retaining walls with freestanding pedestrian barriers. Alta also provided necessary environmental permitting support to the City. The stamped final design bid documents were delivered to the City of Moscow in March 2018 and the project construction was completed successfully with no outstanding issues.