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1-5:Aurora Donald Interchange(Exit 278) Interchange Area Management Plan for Marion County Approval ODOT KN19062 Oregon Department of Transportation—Region 2 Wilsonville.The interchange serves the communities of Aurora, Donald, St. Paul, Canby, Barlow, and Butteville. It provides connections to the Aurora State Airport, Newberg, and the OR 18/99W corridor, Yamhill County, and the Oregon Coast.The interchange also provides access to and from rural agricultural operations and Champoeg State Park.Several businesses are located at the interchange, including two large truck stops, a recreational vehicle park, and a service station serving trucks and local vehicles, recreational traffic, and I-5 users.Additional businesses within the study area include truck services, such as truck washing, repair, and tire maintenance, recreational vehicle storage,screen printing, custom home developers, auto parts retail, concrete accessories and supplies, countertop manufacturers, and agricultural supplies. Existing traffic volumes at the interchange exceed capacity, and traffic congestion affects safe and efficient vehicle movement to and from 1-5. ODOT prepared this TAMP to ensure operation of the interchange area is safe and efficient,to preserve the state's major investment in reconstruction of the interchange, and to minimize the need for future interchange improvements. This TAMP differs from a traditional TAMP; plan development was used as a project development tool to analyze interchange area project needs and alternative designs along with the more traditional planning and policy focus of an TAMP.This expanded scope was needed to address implementation funding made available in 2017 by the Oregon Legislature through the 2017 Keep Oregon Moving Act. The Act allocated $25 million toward the construction of a first phase (Phase 1) of the Aurora Donald Interchange Project.The plan recommends both operational and physical improvements, including access management at the interchange and on the county road system, along with recommended changes to County transportation policy supporting the plan recommendations. This TAMP and reconstruction of the interchange will improve how the interchange area functions, accommodate long-term capacity needs of the system, and support community needs. The land use and access control measures established in the TAMP will provide property owners and developers with an additional level of certainty on the types of development and level of transportation improvements that can be expected to maintain safe and efficient operation at the interchange. 1.4 Problem Statement The Aurora Donald Interchange was built with the interstate in the 1960s. Since its construction, design criteria for the interstate, bridges, and on-and off-ramps have changed with higher typical travel speeds and increased traffic volumes. In addition to its age and outdated design, the interchange's functional performance is substandard.The Marion County 2005 Rural Transportation System Plan (TSP)Sub-Area Plan for the interchange area notes that traffic volumes on the off-ramp from southbound I-5 to Ehlen Road and on Bents Road (approaching Ehlen Road) exceed the capacity of those intersections at certain hours of the day. Those intersections function at level of service (LOS) F and do not meet Marion County's or the OHP's mobility target (volume-to-capacity ratio [v/c] =0.85). Additionally,the proximity of the intersections to each other(about 50 feet apart) is unsafe. Congestion and operation problems at these two intersections have increased since completion of the TSP. Another factor contributing to traffic congestion is land use within the interchange area.Two truck stops draw substantial large truck traffic, resulting in frequent slow acceleration and turning movements that impact county roads and I-5. Traffic frequently backs up on both off-ramps and occasionally onto I-5. Traffic on the off-ramp from northbound I-5 is approaching capacity for the intersection with Ehlen Road,with similar mobility and safety concerns at the southbound exit.The vehicle delays caused by July 2020 1274-3012-031 1-3