Apr 20th, 1:00 PM - 4:00 PM


Northside Boulevard Interchange Improvements, Nampa, Idaho

Faculty Sponsor

Dr. Molly Gribb


The Northside Boulevard Interchange serves the western Treasure Valley by providing interstate access to downtown Nampa, various agricultural and industrial zones, and a growing volume of commuter traffic. Interstate 84 is undergoing lane expansion projects to facilitate future traffic demands throughout the greater Treasure Valley. The expansion of the interstate corridor necessitates the following improvements to the Northside Boulevard Interchange: 1) the redesign and rebuilding of existing interstate overpass bridges to accommodate the interstate expansion, 2) the realignment and addition of lanes to existing on-ramps and off-ramps, 3) the addition of one lane to Northside Boulevard, for a total of six lanes, and 4) the redesign of existing intersections of Northside Boulevard and the interstate on-ramps and off-ramps. To meet the required levels of service D for design year 2030, capacity analyses were performed for all components of the interchange. A system was designed to collect and store stormwater resulting from these interchange improvements. The new bridges and appurtenant foundation and subsurface design were designed to adequately service the interchange and interchange components through 2030.