I-5/Sutherlin Creek & County Road Bridges
Client: ODOT
Location: Douglas County, OR
Construction Cost: $10 Million

Project Features:

  • Accomplished in a record time frame of 5 months from NTP to Construction.

  • Design per latest versions of ODOT BDDM and AASHTO LRFD

  • Design of the precast members for live load continuity with cast-in-place concrete diaphragm capable of resisting the vertical shear

  • Design of the composite concrete deck for the horizontal shear

  • Design of wingwall and railing for TL-5 vehicular crash load per AASHTO LRFD
The project involved the replacement of the existing five-span Southbound and Northbound twin bridges on I-5 over Sutherlin creek in Douglas county, Oregon with new three-span 240 ft long Southbound (58’-110’-72’) and 210 ft long Northbound (58’-76’-76’) structures.

The work was part of the I-5: Sutherlin-Roseburg Section design-build project, which involved repair and/or replacement of seven other bridges. The new three-span superstructures consisted of precast prestressed concrete adjacent beams (48” boxes and 30” voided slabs) with HPC CIP concrete deck. The bridges were supported on HP 12x74 driven piles while the intermediate bents consisted of three 3-ft diameter steel pipe pile column extensions. The bridges were designed AASHTO Load Resistance Factor Design.