Crews broke ground on Hwy 377 in Argyle this month, kicking off a six-mile widening project that drivers in southern Denton County have been waiting years to see materialize. The roadway is going from two lanes to four, with an overpass planned at FM 1171, and the price tag on the work comes in at about $173 million.
Work officially began Oct. 13 on the stretch running from Crawford Road and Country Club Road south to FM 1171 in Flower Mound, according to Cross Timbers Gazette. The project was let in May 2026, the outlet reported, citing documents from the town, and the Texas Department of Transportation now expects construction to wrap up in 2029.
Hwy 377 runs north and south between Denton and Fort Worth, roughly paralleling I-35W, and it stretches all the way down to the southern border with Mexico. That broader footprint is part of why TxDOT has had its eye on the corridor for a while: the agency conducted surveys in 2024 across the entirety of Hwy 377 to identify needs and potential improvements, per the same Cross Timbers Gazette report.
A Years-Long Road to Groundbreaking
Getting here took a while. The Gazette's report traces the widening process back to 2018, when the schematic design for the expansion was approved. Community Impact, however, described the project in a 2023 report as being in a design phase that began in 2019, and that outlet noted the project's contract let date had shifted from September 2022 to March 2023 after delays.
Whichever starting point you use, the project moved slowly through planning before shovels hit dirt this month. The Argyle segment alone was estimated at $84 million in Community Impact's 2023 reporting, and officials at the time said the construction contract could run as long as three years because of a bridge section going in at FM 1171.
What the Finished Highway Will Look Like
Once complete, the corridor will carry two lanes of traffic in each direction separated by a median, replacing the current single-lane-each-way setup, the outlet's 2023 report noted. Flower Mound Mayor Derek France told Community Impact he expects the finished project to bring a noticeable decline in traffic congestion and a smoother flow through the area.
The expansion is also expected to double as an escape valve for drivers trying to dodge one of the area's more notorious bottlenecks. The widening could provide an alternate route for southern Denton County commuters who would rather avoid the intersection of FM 407 and I-35W, the Gazette reported.
Furst Ranch and the Growth Driving the Project
Part of what's fueling the urgency is the development taking shape nearby. The widened highway is expected to pave the way for Furst Ranch, a 2,300-acre development slated to bring thousands of homes, commercial space and a large central park along Hwy 377 and FM 1171, according to the Gazette's reporting. Grocery giant H-E-B has already bought land within that development, the outlet reported.
TxDOT's interest in the corridor extends well beyond Argyle's six miles. The agency has been studying a 462-mile stretch of Hwy 377 running from the Texas-Mexico border north to Oklahoma, with the stated goal of supporting economic growth, accommodating population increases and managing rising traffic, the Gazette reported in a separate piece on that corridor study.
A Second Project Still Waiting in the Wings
South of the current construction zone, a separate widening effort remains stuck in the planning stages. That $80 million project would extend the four-lane expansion from FM 1171 down to Hwy 114 in Roanoke, also taking the roadway from two lanes to four, per the Gazette. Community Impact's earlier reporting pegged that segment's estimated cost at the same $80 million figure, underscoring that it has been on the radar for years without yet breaking ground.
For now, the focus stays on the active work zone through Argyle and Flower Mound, where the Town of Argyle provided a photograph of the construction underway, credited to the Texas Department of Transportation. Local drivers navigating southern Denton County's booming growth corridor will be watching this stretch of highway for the next several years as crews work toward that 2029 completion target.
