Fern Valley Interchange | Phoenix, Oregon

Fern Valley Interchange | Phoenix, Oregon

DESCRIPTION:  The $73 million dollar, I-5: Fern Valley Interchange, Unit 2 project is located at Exit 24 in Southern Oregon.  Due to the projects size and complexity, it encompasses east and west Phoenix roadways, I-5 and Oregon 99.  The project is in its second construction season with completion expected in September 2016.

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SERVICE:  Foundation Engineering was retained by ODOT to complete the geotechnical design following the Type, Size and Location (TS&L) project phase.  Throughout the design, Foundation Engineering staff worked seamlessly with ODOT designers to complete the project.  The geotechnical work included the development of design and construction recommendations for bridge foundations, bridge abutments and wing walls, MSE walls, soil and rock cuts, embankments, sign structures and signal poles.  The information was summarized in preliminary, draft and final geotechnical reports at the respective project stages.  Our staff is also providing construction support services.

Major project elements included the replacement of the Bear Creek and I-5 Overcrossing bridges, 14 MSE wall segments (up to 23 feet high), soil and rock cuts for new roadway alignment, embankment construction, two sign bridges, six cantilever sign foundations, signal poles and bike path improvements.  In addition, the FVI project is unique to Oregon as it contains the first diverging diamond interchange that will provide higher capacity to move traffic while requiring lower right-of-way needs.  The diamond interchange can be constructed for a relatively smaller price tag than more conventional designs, and is safer because there are fewer conflicting moves.  Vehicles crossing the interchange move to the opposite side of the road to either enter I-5 or to cross it, reducing the number of traffic signal cycles for traffic to clear.