I-90, SH-41 Interchange

As a subconsultant to David Evans & Associates, STRATA performed a subsurface exploration and subsequent geotechnical reports for the Idaho Transportation Department (ITD) I-90, SH-41 Interchange project located in Kootenai County. The project includes constructing a new single-point urban interchange (SPUI) shifted west of the existing interchange, three new bridges, a new shared-use path, and full-depth asphalt pavement replacement along sections of I-90, Seltice Way, SH-41, and Mullan Avenue. The new interchange increases safety, capacity, and mobility of the public. STRATA’s scope included advancing 89 borings to depths ranging from 10 feet to 100 feet and collecting over 800 soil samples; over 600 laboratory tests were performed for the project, including moisture content, sieve analysis, Atterberg Limit, pH, resistivity, sulfate, and R-Value tests.