Drive out toward Valley Mills on Highway 6 this week and the two spans over Lake Waco don't look like twins anymore. The northbound bridge is carrying every car in both directions now, a two-lane, two-way configuration squeezed onto a structure that used to handle one-way traffic alone. Behind the barrier wall, the southbound bridge sits empty, waiting for demolition crews to start tearing it apart.
That's not a temporary lane shift you'll forget about in a week. TxDOT began moving all Highway 6 traffic onto the northbound bridge Sunday, August 23, at 7 p.m., and by Saturday, August 29, the switch was complete. What's different this time is what happens next: that single bridge now carries two-way traffic in a two-lane configuration, and it will stay that way through fall 2027, while crews fully demolish and rebuild the southbound structure from scratch. If you commute between Waco and Speegleville, China Spring, or Valley Mills, the story isn't "there's more construction on 6." It's that one of the two bridges over the lake is temporarily gone, and every car that used to have its own dedicated span is now sharing the other one.
What Actually Switched This Weekend
The mechanics are straightforward once you see them laid out. TxDOT's contractor is running a $114 million project to replace both aging Twin Bridges, structures that have carried Highway 6 traffic since the 1960s. Rather than working on both spans at once, the agency is retiring one bridge completely, funneling all traffic onto the other, and starting demolition on the empty one.
Here's what closed along with the switch:
- The southbound off-ramp to Midway Park
- The northbound on-ramp past Fish Pond Road
- The north-to-south U-turn at the south end of the bridge, which crews shut down overnight on August 20 just to move equipment into position
TxDOT public information officer Jake Smith described what the finished product looks like once both bridges are rebuilt: each one will carry two lanes, the same number as today, but with noticeably wider lanes and larger shoulders. The tradeoff for a slower few years is a safer, wider crossing once the work is done. The full project is scheduled to wrap in 2029, a date TxDOT has tied directly to another piece of construction happening at the same time a few miles away.
The Other Squeeze Happening At The Same Time
That other piece is the $250 million I-35 South widening project, which is expanding the interstate from six lanes to eight between South Loop 340 and 12th Street. It's a different road, a different budget, and a different contractor, but the underlying maneuver is nearly identical to what just happened on Highway 6: squeeze traffic onto one side while the other side gets rebuilt. Business owners along the affected frontage roads have already told local reporters that the detours are costing them customers who simply give up and go elsewhere rather than fight the access changes.
Put the two projects side by side and the pattern is hard to miss.
| Project | What's happening right now | Timeline |
|---|---|---|
| SH 6 Twin Bridges | All traffic squeezed onto the northbound bridge while the southbound bridge is demolished and rebuilt | Two-way pattern through fall 2027; full project complete 2029 |
| I-35 South widening | Six lanes becoming eight between Loop 340 and 12th Street; frontage roads and ramps shifting | Main lane traffic expected to shift onto the newly built northbound lanes around this time next year; overall completion expected 2029 |
Both projects land on the same 2029 finish line. For anyone who regularly crosses between the west side of the lake and downtown Waco, that means two of the main arteries into the city are constrained at once, not in sequence. If you've been cutting over to I-35 to dodge the bridge slowdown, you're running into the same kind of squeeze on that route too.
What You Lose Access To, Not Just Time
The traffic pattern gets most of the attention, but the construction has already changed what's reachable along the shoreline itself. A longtime commuter who drove the Twin Bridges five days a week for fourteen years as an elementary school principal in Crawford described watching fishermen lose their footing, literally. A stretch of bank near the bridge where people used to park and walk down to cast a line has been off limits since reconstruction started, and there's no indication it reopens before the southbound bridge is finished.
It's a small detail against a $114 million project, but it's the kind of change that shows up in daily life long before it shows up in any construction update. If Saturday morning fishing near the bridge has been part of your routine, plan on finding a different stretch of bank for a while.
How Long This Actually Lasts, And What Comes After
Fall 2027 is the date to remember. That's when the rebuilt southbound bridge is expected to reopen and traffic splits back into two directions on two separate structures, each with the wider lanes and shoulders TxDOT has promised. The full project, including whatever finishing work remains after that split, is targeted for 2029.
It's worth remembering that Highway 6 doesn't stop at Waco's edge. The corridor runs west toward Valley Mills and east toward Bryan-College Station, and both ends are under active construction this year, though under entirely separate TxDOT budgets and contractors. The Brazos Valley side is dealing with its own multi-year widening effort centered on the Texas Avenue interchange, unrelated to the Twin Bridges work but a reminder that this stretch of highway has become a priority corridor on both ends at once.
What To Actually Do About It
None of this changes overnight into something manageable, but a few adjustments make the next fourteen months easier:
- Build extra time into any trip that crosses the lake, especially during commute hours when the two-lane, two-way pattern bottlenecks fastest
- Don't count on the Midway Park or Fish Pond Road ramps reopening before the southbound bridge does
- If you're detouring through I-35 South to avoid the bridge, expect a similar squeeze there through the same general timeframe
- Treat the current pattern as a trade, not a downgrade. The lane count looks the same as before the project started, but it's temporary by design so crews can rebuild what's missing
The Twin Bridges will be twins again. Just not until fall 2027, and not without a few changed habits between now and then.
Kelly Commercial tracks projects like this one because they shape more than a Tuesday commute. Road capacity, access points, and construction timelines are exactly the kind of detail that eventually shows up in how a corridor gets used and valued. If you're watching Highway 6 for reasons beyond your daily drive, the team at Kelly Commercial can walk you through what these projects mean for a specific property or plan. Let's Get Started.
