Dexel Avenue in Oak Creek, Wis., was in bad shape. Constantly covered with floodwaters, the roadway was deteriorating. To fix this, the city upgraded the intersection to a four-lane urban cross section with a median and turn lanes. The city chose a Rammed Aggregate Pier (RAP) system to stabilize organic subgrade soils through a wetland area near the roadway. This was the first time this method was used in Wisconsin. During planning, the design team...