Colorado’s most scenic and vital mountain highway faces major restrictions starting March 16 as the Colorado Department of Transportation resumes long-awaited bridge repairs through Glenwood Canyon.
The 17-mile stretch between Glenwood Springs and Dotsero will drop to one lane in each direction for most of 2025 and possibly into 2026, creating the biggest traffic squeeze on I-70 since the 2021 mudslides closed the canyon for weeks.
Drivers should expect serious delays, especially on weekends and during peak travel times. CDOT warns that trip times through the canyon could double during heavy work periods.
Why the Work Can’t Wait Any Longer
Eight aging bridge joints need immediate replacement after years of wear from heavy traffic, harsh winters, and the 2021 debris flows that damaged multiple structures.
These expansion joints sit where bridges meet the roadway. When they fail, they create dangerous potholes and force emergency closures. Crews already replaced 12 joints in 2024. The remaining eight are the most critical.
“These repairs are non-negotiable for safety,” CDOT Region 3 spokesperson Tracy Trulove told reporters Thursday. “We’ve pushed this work as long as we could, but we’re at the point where failure risk is too high.”
The project also includes guardrail upgrades to meet current crash standards, particularly important given the canyon’s steep drops and narrow shoulders.
What Drivers Will Face Starting Monday
Concrete barriers go up March 16. Both eastbound and westbound traffic will narrow to single lanes through multiple work zones.
Work hours run 24/7 in some sections to finish faster. Flaggers and pilot cars will control traffic in the tightest spots.
CDOT’s estimated delays:
- Weekdays: 20-45 minutes added
- Weekends: 45-90 minutes added
- Peak holiday periods: 2+ hours possible
The narrowest sections include the Hanging Lake tunnels and No Name rest area, where there’s literally no room for error.
The Bigger Picture for Colorado Travel
This isn’t just another road project. I-70 through Glenwood Canyon carries 34,000 vehicles daily and serves as Colorado’s only direct east-west mountain corridor.
When this road slows, the entire state feels it. Freight companies reroute hundreds of trucks north through Wyoming, adding hours and millions in costs. Ski towns from Vail to Aspen face delivery delays. Summer tourists may cancel plans entirely.
Local businesses in Glenwood Springs already report cancellations. “We’re telling guests to add two hours or consider Amtrak,” said one hotel manager.
Alternatives and Survival Tips
CDOT recommends these detours when delays exceed one hour:
- North route: I-70 to Silverthorne, then Highway 9 to Kremmling, Highway 40 to Steamboat Springs, then south on Highway 131
- Far north route: I-80 through Wyoming (adds 4+ hours but often faster during heavy delays)
Real-time help:
- Check COtrip.org or the COtrip Planner app before leaving
- Follow @CDOT_Western on X for live updates
- Use 511 for phone updates
Best travel times: Monday-Wednesday mornings or late Sunday nights show the lightest traffic historically.
The work continues through November 2025, with possible winter shutdown and resumption in spring 2026 if weather delays occur. CDOT hopes to finish all remaining joints this construction season.
Anyone who has driven Glenwood Canyon knows its beauty comes with a price. Those towering walls and hanging bridges that make it one of America’s most spectacular highways also make it one of the hardest to maintain.
This necessary pain will keep the canyon open for decades to come. The alternative, letting these bridges deteriorate further, risks the kind of catastrophic closure that paralyzed Colorado in 2021.
Drive slow, plan ahead, and remember every minute spent crawling through those red rock walls keeps this irreplaceable route safe for the next generation.
What do you think about the timing of this project? Are you changing your travel plans? Share your thoughts below and tag #I70Glenwood on social media if you’re posting about your drive.
