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Adams County, Thornton plan lane additions at 128th and Riverdale to ease school‑time congestion
Summary
Engineering staff recommended adding a southbound right‑turn slip lane and an eastbound left‑turn lane at 128th Avenue and Riverdale Road to reduce peak delays by ~39–45%. Estimated design cost ~$113,000 and construction ~$582,000; Thornton agreed to a 50/50 cost split and to lead project delivery; staff recommended an IGA and budget amendment to fund 2026 design.
Adams County Public Works and City of Thornton staff presented a joint proposal to address recurring congestion and safety concerns at the intersection of 128th Avenue and Riverdale Road near Riverdale Regional Park and Riverdale Ridge High School.
Traffic counts and modeling showed excessive delays (level‑of‑service failures) at peak times, including school pickup and…
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