$905M I-70 Floyd Hill Widening Project Reaches Halfway Point in Colorado
The Colorado Department of Transportation says its $905 million I-70 Floyd Hill Project has reached the halfway point after three years of construction, with crews completing 211 controlled blasts and removing more than 765,000 tons of rock and material along the eight-mile mountain corridor between Evergreen and Idaho Springs, according to CDOT and 9News.
Market Impact
The multi-year project, built by contractor Kraemer North America, was originally estimated at $700 million in 2020 but rose to $905 million as design progressed and construction and material costs climbed, CDOT says. The project rebuilds an eight-mile stretch of I-70 from west of Evergreen to eastern Idaho Springs, an economic gateway corridor that has been a chronic bottleneck for accidents, traffic delays, and emergency vehicle access.
With major rock blasting operations now complete, drivers will no longer face the daily and weekly traffic holds that defined the project’s first three years. “The traffic impacts will be better, we won’t have consistent weekly traffic holds. That’s something to celebrate,” project director Kurt Kionka told 9News. The next phase shifts to a more visible construction effort: building and rebuilding several bridges over live traffic. “We’re doing this over live traffic, up in the air. So we don’t have to close traffic during construction,” Kionka said.
CDOT Executive Director Shoshanna Lew said the corridor’s original layout created what she called “an hourglass problem,” concentrating traffic into a narrow, high-risk section with limited margins for emergency response. The project adds a third westbound travel lane as a full-time tolled Express Lane, changes the highway alignment through Floyd Hill and the Veterans Memorial Tunnels to straighten curves and improve sight distance, and introduces a “braided” configuration where eastbound and westbound lanes sit at different heights. Other elements include a new two-mile frontage road for emergency response, new U.S. 6 on-ramps, roundabouts at two interchanges, and wildlife, air, and water quality mitigations.
CDOT expects westbound I-70 to be in its new alignment by the end of 2027, eastbound lanes to follow by the end of 2028, and the full project to be complete in 2029.
What It Means for Subcontractors
- Heavy civil and bridge contractors should expect a multi-year ramp-up in structural work: CDOT flags “substantial bridge construction,” including new bridge columns and beam-setting, as the dominant activity through 2029.
- Firms with experience building over live traffic have a clear opening, since Kraemer North America’s approach relies on constructing new alignment bridges above active lanes without full closures.
- Site and utility contractors should track the two-mile frontage road build-out and the new US 6 on/off-ramp work at the Hidden Valley/Central City Parkway interchange, both discrete, biddable scopes within the larger project.
- Environmental and stream-mitigation specialists should watch for subcontract packages tied to wildlife connectivity structures, air quality monitors, and Clear Creek Greenway trail resurfacing called out in CDOT’s project scope.
- Subcontractors on other Colorado mountain-corridor jobs should note the project’s cost growth, from $700 million in 2020 to $905 million today, as a benchmark for escalation risk on multi-year mountain construction bids.
