Four Collin County corridor updates, including Outer Loop Segment 3C

1. Outer Loop Segment 3C: official opening, cost and design

Segment 3C of the Collin County Outer Loop officially opened Nov. 7, 2025, at a cost of $62.7 million funded through the county’s 2018 bond program. Construction began in February 2024 and the project, originally projected to finish in March 2026, was completed early and opened in November 2025. The new corridor links the Dallas North Tollway in Celina to U.S. Highway 75 north of Melissa; CBS reported the stretch as a 15‑mile corridor currently built with one lane in each direction that officials say will be expanded. The segment includes two extended bridges spanning Honey Creek and the East Fork of the Trinity River and incorporates about 155,000 square yards of continuously reinforced concrete pavement. Collin County Judge Chris Hill said, “We’re tremendously excited to open this new segment of the Outer Loop. This roadway will improve mobility and reduce travel times across the fast-growing northwest corridor of Collin County. I’m grateful for the hard work and dedication of everyone who helped make this project a reality.” County and city leaders framed the corridor as locally funded, non‑tolled infrastructure that will spur commercial, healthcare, hospitality and light industrial development; Collin County Commissioner Darrell Hale noted the project’s uniqueness because it was built “without state or federal dollars.” Celina Mayor Ryan Tubbs added, “I think it provides a lot of opportunity in the commercial space” and, “It's really bridging that connection between Celina to McKinney.” McKinney Mayor Bill Cox called the project “a major step forward in improving east-west mobility and connecting communities across our region.”

3. US 380 corridor: feasibility, segmentation and lingering uncertainties

TxDOT’s Keepitmovingdallas materials show the US 380 Collin County corridor has completed a feasibility study and been divided into five independent project segments, and that environmental study, preliminary engineering and alignment selection are complete for each segment except “US 380 Princeton.” The agency cautions that projects will advance on different schedules depending on traffic needs and funding availability and that map alignments may change, the site notes, for example, that a yellow section remains under environmental review and the final alignment may differ from what is shown. That phased approach is reflected in the TxDOT Q3 2025 project list: CSJ 0135-03-046 (US 380, Airport Dr. to CR 458) appears as a discrete TxDOT project with letting in March 2025 and an estimated cost of $141.4 million, but shows 0% complete in the Q3 report. The combination of large price tags, multiple independent segments, and environmental/alignment caveats means US 380 improvements will proceed incrementally, with timing driven by funding availability and traffic priorities rather than a single continuous construction schedule.

4. Collin County Thoroughfare Plan update: adoption and planning context

Collin County’s Commissioners Court adopted the updated 2025 Thoroughfare Plan during a public hearing on December 8, 2025, following public information sessions held March 19, 2025 in Anna and April 3, 2025 in Lavon and a public comment period that closed April 18, 2025. The county frames the Thoroughfare Plan as the tool local governments use to prioritize infrastructure investments, manage traffic patterns, and guide future planning and development; the plan is explicit that Collin County’s rapid growth, roughly 1 million people in 2020 and projected to exceed 2 million by 2050, underpins the need for coordinated corridors and capacity projects. Collin County updates the Thoroughfare Plan roughly every five to 10 years, previous updates occurred in 2014 and 2020, and the 2025 adoption provides the policy scaffolding for both county projects like the locally funded Outer Loop Segment 3C and the state‑led TxDOT program. With the new plan in place, county officials and TxDOT now have a multi‑year framework that ties bond-funded local buildouts, large TxDOT contracts and phased corridor studies together into a long‑range roadmap for travel and development across Collin County.