Idaho Springs I-70 Closes Overnight For Floyd Hill Bridge Work

Glenwood Springs —Three overnight closures. One $900 million project. Zero live traffic on the bridge deck for those eight-hour windows.

It’s a rare concession from Colorado Department of Transportation (CDOT) crews, who have spent the bulk of the Floyd Hill Project’s construction phase working directly overhead of moving cars. For most of this multi-year, multi-billion-dollar effort, drivers on Interstate 70 have had to squeeze through narrow lanes while cranes and concrete pour above their windshields. Now, for the first time, CDOT is shutting down the interstate entirely to install a protective shield on a cast-in-place segmental bridge near Idaho Springs.

On paper, it’s a safety measure. In practice, it means your commute through the mountains just got complicated for two specific weeks in October.

The Post Independent reported that CDOT is planning one full eastbound closure and two full westbound closures this month. The work is necessary to finish the new bridge structure, a critical piece of infrastructure that connects the Georgetown Loop bypass system.

Here is how it breaks down for drivers heading through the area:

The Eastbound Hit From 9 p.m. Sunday, Oct. 18, to 5 a.m. Monday, Oct. 19, eastbound I-70 is closed between Exit 241 (Idaho Springs) and Exit 243 (Hidden Valley/Central City Parkway). If you’re coming from Denver or Boulder and heading toward Glenwood Springs, you’ll be forced off the interstate at Exit 241. You’ll merge into a single lane and take County Road 314 east before re-entering I-70 at Exit 243.

It’s not just one night, either. The eastbound off-ramp at Exit 243 will be closed for roughly four days, from the start of Sunday evening through 6 a.m. Friday, Oct. 23. If you rely on that exit to access local businesses or residential areas in Idaho Springs, you’re out of luck. CDOT says all traffic should use the Exit 241 off-ramp instead.

The Westbound Squeeze Westbound drivers face two consecutive nights of full closure at Exit 244 (U.S. Highway 6). The first is Monday night into Tuesday morning, Oct. 19-20. The second is Tuesday night into Wednesday morning, Oct. 20-21. Both run from 9 p.m. to 5 a.m.

During these windows, westbound traffic will merge into one lane and use the Exit 244 off- and on-ramps to continue. It’s a tight maneuver for a highway that normally handles heavy commuter traffic and freight trucks alike.

Let’s do the math on the timing. CDOT notes that all work is weather-dependent. If rain or snow hits, the entire schedule shifts by a week. The eastbound closure moves to Oct. 25-26, and the ramp closure extends through Oct. 30. The westbound closures shift to Oct. 26-27 and Oct. 27-28.

For context, the Floyd Hill Project is a massive undertaking designed to improve safety and traffic flow between Denver and Colorado Springs. It includes new bridges, widened roadways, and improved access points. The $900 million price tag reflects the scale of the work in a rugged, mountainous environment where construction is inherently difficult and expensive.

Most of the bridge work has been done with traffic flowing, which is a logistical marvel but also a source of frustration for drivers who’ve been dealing with lane closures and speed reductions for months. These full overnight closures are the final push to complete that specific bridge segment.

The practical bottom line for locals and commuters: If you’re driving I-70 through the Idaho Springs area this month, plan your trips around those 9 p.m. to 5 a.m. windows. Avoid the exits that are closed. If you’re a trucker or a commuter who relies on specific ramps, know your backup route before you hit the highway. CDOT is making progress, but until the protective shield is in place and the bridge is fully integrated, you’re still at the mercy of a construction schedule that can shift with a single storm front.