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CDOT says Sonoma Valley rezoning falls below traffic-impact threshold; council asks for context
Summary
CDOT told council the Sonoma Valley rezoning plan estimates roughly 250 daily trips, below the city’s Neighborhood 2 TIA threshold of about 1,500 daily trips, but council members pressed for continued coordination on intersection and pedestrian improvements.
Council members questioned transportation impacts for a rezoning request for an 8.47-acre site off Sonoma Valley Drive during the Feb. 17 meeting.
Staff described the petition as a Neighborhood 2 conditional rezoning to allow up to 39 attached units with a 48-foot maximum building height and building limits of six units per building. Nolan Gross of Urban Design Partners said the project would provide rear-loaded townhome units with two-car garages and landscaping along a residential alley. An earlier plan included a concrete median on Sonoma Valley Drive, but following Cedar Mill community concerns and coordination with CDOT the petitioner revised the plan to provide striped left-turn lane markings rather than a raised median.
Council member LaWanna Mayfield asked when a traffic-impact analysis (TIA) would be required, noting nearby multifamily development, a fast-food restaurant, a gas station and a lack of a traffic signal near the intersection. Jay Carpenter of CDOT said the Neighborhood 2 zoning threshold for requiring a TIA is approximately 1,500 daily trips (about 150 peak-hour trips); he said the petition was estimated at about 250 daily trips and therefore did not trigger a city-required traffic study. Carpenter added a signal and design improvements at the Sonoma Valley intersection were in design with the railroad and expected to be installed by the end of 2025, and that a left-turn lane would be provided as part of this petition’s frontage work.
Why it matters: Council members highlighted concerns about cumulative traffic and nearby development. CDOT’s threshold guidance explains why some small-to-midsize housing projects do not require a formal TIA, though frontage and intersection work may still be required through permitting and coordination.
What happens next: The petitioner will revise site plans to reflect the striped left-turn lane and coordinate final frontage improvements with CDOT during permitting.
