ODOT Moving Ahead - April 2013

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The problem

The solution

The Fern Valley interchange connects I-5 and Phoenix at exit 24. The interchange experiences traffic congestion through the day, but is especially severe during the morning and evening commutes. Existing and proposed development along the east side of I-5, as well as development growth within the Rogue Valley, are choking the interchange’s capacity and causing safety concerns.

ODOT will construct the Fern Valley Interchange project using a crossing diamond design that provides a higher capacity to move traffic while reducing right of way needs.

The process The project’s design phase began in 2004. The Fern Valley Through design alternative was eliminated in 2009 because it would have an adverse impact on nearby farm land. Later, the Project Development Team unanimously supported the North Phoenix Through build alternative as part of the federally required environmental assessment.

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April 5, 2013

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 signal cycles for traffic to clear. The Missouri Department of Transportation was the first agency in the United States to construct an interchange of this design. The project design keeps roadways relatively untouched west of the interchange while constructing a new interchange just north of the existing one, and realigning North Phoenix Road between Home Depot and the Peterbilt shop.

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