Drilled Shafts NE Hwy 99 – NE 20th Avenue / Vancouver, WA Installed 6 each 90 inch diameter drilled shafts to depths in excess of 80 feet in silts over dense sands and gravels. Utilized permanent casing and slurry to shore the shafts. Oregon Health & Science University Lift Station 10B Related Case Studies UPRR Prebore ShaftsBlock 35 John RossI-205 Columbia & Willamette River…Portland Aerial TramI-84 at the DallesWB Passing Lane – US…Bear Creek BridgeInfluent Pump StationTacoma Second Supply PipelineCalpine-McNary Transmission Line