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I-5: McKenzie River to Goshen Rock Cut

I-5: McKenzie River to Goshen Rock Cut
Lane County, Oregon

GRI served as the geotechnical engineer-of-record for the replacement of five bridges on Interstate 5 near Eugene. This design-build project included two 800-ft-long bridges over the McKenzie River and three smaller bridges. The bridges are supported by steel piles at the end bents and large-diameter drilled shafts in soft and hard rock at the intermediate bents. Existing subsurface information was supplemented with 31 borings and extensive soil and rock laboratory testing. A foundation report was prepared for each bridge site, and GRI provided observation services during installation of drilled shaft and pile foundations. GRI also provided pavement design services and design criteria for large embankment fills and a 500-ft-long, 70-ft-high cut in sedimentary rock.

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