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Commission hears competing South Arterial alternatives tied to new Southwest UGB
Summary
Planning staff described two main alternatives for the Southwest Corridor: a staged Parr realignment that serves local industrial parcels in the near term, and a longer South Arterial that would extend Stacy Allison and connect to Viewbill Road to direct trucks away from residential streets.
During the presentation staff outlined two modeled alternatives for the Southwest Corridor. Alternative 1 (a Parr realignment) focuses on lower‑cost, staged local fixes and short-term intersection improvements, while Alternative 2 is a longer-term South Arterial that would extend Stacy Allison and connect to Viewbill Road to serve industrial traffic and reduce truck volume on Evergreen and residential streets.
Staff cautioned that modeling shows the South Arterial gives residents more routing options internally but had limited effect on distant pinch points; induced‑demand effects mean a new arterial can attract traffic over time. Staff asked the commission to prioritize phasing and noted some segments will be built incrementally as developers bring forward subdivision and annexation proposals.
