Phasing Strategies

Short-term phasing strategy (2008-2017)

Begin construction of the Tonquin Trail (RTP Projects #10092 and #10854).

Upgrade existing streets to two lanes with turn lanes, traffic signal timing, bike lanes and sidewalks, including Herman Road, Tualatin-Sherwood Road, 95th Avenue (RTP Projects #10715, #10718, #10852).

Add southbound auxiliary lane from I-205 to I-5/Elligsen Road and northbound auxiliary lane from I-5/Elligsen Road to I-205 interchange. (RTP Projects #10872 and #11177)

Conduct more detailed project planning and begin construction of a two-lane extension of SW 124th Avenue (RTP Project #10736: 124th Avenue) from Tualatin-Sherwood Road to I-5/North Wilsonville interchange to support its operation as an industrial access route. The planning work will further consider potential impacts on the existing development and the natural environment. It will also include more detailed definition of the design and alignment to mitigate impacts and to integrate with land use and transportation plans for the area.

Conduct more detailed planning to meet all of the conditions placed on new Southern Arterial project, including:

Conduct the I-5 South Corridor Refinement Plan (includes I-5 from Portland to Tualatin, I-5 from Tualatin to the Willamette River, and Highway 99 from I-5 through Tigard and Sherwood) and land use planning for areas recently added to the urban growth boundary and any land designated as urban reserves. These planning efforts will include opportunities for further public participation and input.

Conduct more detailed project planning on potential Southern Arterial impacts on existing development and the natural environment to develop more detailed definition of the design and alignment to mitigate impacts and coordinate with land use and transportation plans for the area, including the I-5 South Corridor Refinement Plan. This planning effort will include opportunities for further public participation and input.

Medium-term phasing strategy (2018-2025)

Widen existing streets to four lanes with turn lanes, traffic signal timing, bike lanes and sidewalks, including Tualatin-Sherwood Road, Roy Rogers Road, Boones Ferry Road and Herman Road (RTP Projects #10568, #10700, #10708, #10732 and #10735)

Program right-of-way acquisition for the Southern Arterial project in the 2018 - 2025 time period to allow time to conduct the I-5 South refinement plan and land use plans for designated urban reserves in the area.

Complete more detailed project planning and begin construction of a two-lane connection from the Tualatin Road/Herman road intersection to I-5 at Lower Boones Ferry Road (RTP Project #10731), consistent with the City of Tualatin's adopted plans. This route is not intended to serve through traffic, but rather to provide access to the surrounding industrial area and neighborhoods. The planning work will consider alternative alignments and designs across the Tualatin River and I-5 near the I-5/Lower Boones Ferry Road interchange to mitigate impacts. This planning effort will include opportunities for further public participation and input.

Longer-term phasing strategy (2026-2035)

Construct the Southern Arterial, consistent with conditions and future planning.

Other refinements approved by JPACT and the Metro Council to better reflect the steering committee's recommendation

Remove the minor arterial designation on Tualatin Road between Herman Road and OR 99W. This designation was made in error, since it is intended to function as a collector. The current design is the city of Tualatin's long-term plan for this street - two lanes with a center turn lane, planter strip, sidewalks and bike lanes.

Remove right-of-way acquisition for the southern arterial from the federal "financially constrained" project list, pending compliance with the conditions. (Only projects in the financially constrained list are eligible to receive federal funding.)