Drilled Shafts Bear Creek Bridge / Central Point, OR Installed 6 – three foot diameter drilled shafts, and 6 – five foot diameter drilled shafts. Influent Pump Station Wilsonville High School Related Case Studies UPRR Prebore ShaftsBlock 35 John RossI-205 Columbia & Willamette River…Portland Aerial TramI-84 at the DallesNE Hwy 99 – NE…WB Passing Lane – US…Influent Pump StationTacoma Second Supply PipelineCalpine-McNary Transmission Line