US-20 traffic to shift as South St. Anthony Interchange nears completion

Road construction with closures and traffic shift on US-20 South St. Anthony interchange.

Beginning early this week, traffic on U.S. Highway 20 will be routed onto the newly built overpass bridge at South St. Anthony Exit 344. This marks the final stages of construction on a new full interchange at this location.

North and southbound motorists were previously routed onto the ramps while the overpass bridge was being constructed, with speed limits lowered to 35 mph. Traffic will now move to travel on mainline US-20 at a reduced work zone speed.

With this traffic shift, South St. Anthony ramps will be closed as work continues on 400 North under US-20. Workers and equipment will still be present on site, so drivers are urged to stay aware and be cautious.

This project is expected to be substantially complete later this summer, with the ramps and turning movements onto 400 North open then.

Funding for this project is assisted by Governor Little’s Leading Idaho Transportation Expansion and Congestion Mitigation (TECM) fund. The Leading Idaho initiative allows ITD to take a deliberate approach to invest in projects in corridors that will enhance safety, improve mobility, further strengthen Idaho’s economy, and positively impact communities across the state for years to come.

Updates on this project and others across Idaho can always be seen on the Idaho 511 app, or at 511.idaho.gov.

Single lane opened to traffic on Porterville overpass

The Idaho Transportation Department has installed traffic signals allowing single-lane traffic to pass over the Porterville overpass north of Blackfoot. The overpass was damaged Tuesday evening when it was struck by a backhoe being hauled by a semi on Interstate 15. The collision caused severe damage to one of the concrete girders under the overpass.

ITD has determined it is safe to allow traffic to pass over the undamaged portion of the bridge. The traffic lights will alternate, allowing vehicles to use the single open lane.

In addition, concrete barriers will be put in place to ensure traffic does not pass over the damaged girder.

ITD continues to investigate what will be required to repair the bridge.

Motorists are encouraged to check 511.idaho.gov for the latest traffic information and width restrictions.

US-20 delays and slower speeds starting next week for INL paving operations

Graphic map of US-20 west of Idaho Falls indicating traffic movement changes near the junction of US-20, US-26 at the INL entrance.

The Idaho Transportation Department is partnering with the Idaho National Laboratory to alert motorists of changes to their commute beginning next week.

Starting Monday, paving operations within the INL site will limit usual turning movements at the Puzzle, the junction of US-20, US-26 and INL. During morning and overnight hours, traffic will be able to make right turns only off US-20 into the site.

From 4 to 6:30 p.m. traffic at the Puzzle will be restricted to outbound only movement, with no inbound turns allowed.

Speed will be reduced to 50 mph on US-20 near and through the Puzzle while this work is completed.

Both inbound and outbound site traffic will be able to access US-20 from an alternative route at West Portland Avenue, Gate Three, one mile west of the Puzzle. No dedicated turning lane exists on US-20 at this intersection, so motorists are urged to be alert and slow down.

Flaggers will be present as needed when INL paving work is near the intersections of US-20 or US-26. Traffic control signs and lower speed limits will not be in effect when work is not actively ongoing along these roadways.

INL paving operations are expected to be complete and traffic running as usual by late September.

INL employees should refer to internal communication regarding effects to their commute on roads within the site. Effects to US-20 and US-26 will be noted on the Idaho 511 app and at 511.idaho.gov.

Construction begins Monday to widen I-90 between Post Falls and Coeur d’Alene

Traffic congestion on Interstate 90 between Post Falls and Coeur d'Alene.

The Idaho Transportation Department will begin construction Monday on a major project to widen Interstate 90 between State Highway 41 in Post Falls and U.S. Highway 95 in Coeur d’Alene. This four-year effort, expected to be complete in 2029, will add capacity to one of North Idaho’s busiest stretches of freeway. As one of the largest infrastructure investments in the region, the project is designed to ease congestion, enhance safety, and position the corridor to accommodate continued growth for years to come.

Initial construction tasks will include tree removal from the center median and shoulders, placing temporary barriers, installing work zone signs, minor traffic shifts, and starting construction on the Prairie Trail Bridge. As work begins and continues through fall and winter, drivers can expect:

Work will typically occur Monday through Friday with both daytime and nighttime activity, though some weekend work may occur as well
Two lanes of travel being maintained in both directions during daylight hours
- Lanes may be reduced during nighttime hours as needed
Variable speed limits, with digital signs adjusting speeds based on nearby work activity.
- Drivers should pay extra close attention to the posted speed limits and drive accordingly

The widening effort is the first project from the I-90 Corridor Study to move into construction, prioritized for its significant impact in reducing congestion between SH-41 and US-95.

Major improvements the project will deliver include:

Adding two lanes in both eastbound and westbound directions of I-90 for a total of four lanes in each direction
Replacing and widening bridges over Huetter Road, Atlas Road, and Prairie Trail
Realigning and improving adjacent sections of both the Prairie and Centennial Trails
Lengthening existing on- and off-ramps to allow for a safer merging with I-90 traffic. Ramp locations include:
- All ramps at the Northwest Blvd. Interchange
- Eastbound off-ramp at US-95
- Westbound off-ramp at US-95

“Relieving congestion on this stretch of I-90 is one of the most common requests that ITD hears from the public and we are excited to begin work to improve the traveling experience on the corridor,” said Zach Feist, ITD Project Manager.

This corridor expansion project will ultimately be bookended by two new interchanges. On the west end, the SH-41 interchange began construction in 2022 and is expected to be fully complete in 2026. At the east end the next major I-90 interchange project to be built will be at US-95 and is currently in the design phase, with construction possible as early as 2027.

Various projects identified in the I-90 Corridor Study are advancing separately but on a similar timeline through the design and construction phase, including I-90 interchange projects at both ends of this project corridor. Construction of the SH-41 interchange is scheduled to be complete next year and the US-95 Interchange is in the design phase with construction expected to begin in 2027 after recent funding was awarded through the TECM bonding program.

The project is primarily funded with Transportation Expansion and Congestion Mitigation funds as part of Governor Little’s Leading Idaho initiative. The TECM program allows ITD to accelerate project timelines to address rapid growth and build critical infrastructure today that would otherwise take many years to fund and build.

ITD is committed to providing accurate and up-to-date information for drivers to plan extra time to safely pass through the work zone. To stay up to date on this and other projects within the I-90 corridor, visit our website and sign up for email and text updates.

For the most up-to-date statewide traffic information, visit 511.idaho.gov or download the app.

Work begins on I-15 bridges toward the Montana state line

Northbound lanes and signs on I-15 at Exit 184 Stoddard Creek.

Repairs and improvements are starting today on the first of 11 bridges along Interstate 15 north of Roberts toward the Montana state line. Crews will be replacing water damaged concrete and installing anti-skid surfacing to greatly extend the life of the bridges. Travelers should expect to see lane restrictions and lower speed limits where work is occurring through the summer and fall.

Crews are beginning today where the most significant repairs are needed, on the northbound lanes of Exit 184 at Stoddard Creek. Traffic will be routed off the bridge and on to the ramps, with travel affects much like those seen last year on the southbound lanes.

Stoddard Creek Road underneath I-15 is the access to popular camping areas and will be restricted to one lane or closed intermittently during construction. The closure will only be in place when passing under the bridge is not safe based on the work being done. When closed, motorists can proceed to Exit 190 at Humphrey, turn back around and head south to Stoddard Creek, then make a right turn toward camping areas.

From I-15 mileposts 136 to 189, repairs are also being done on ten other bridges and interchanges through the summer and fall. Work at Exit 180 at Spencer and Beaver Creek Overpass will continue for approximately six weeks. At the other locations, it will last just three to four days. Traffic will be reduced to one lane in each direction on I-15 where these efforts are being completed.

Updates on specific work zones and travel impacts will be available on the Idaho 511 app or at 511.idaho.gov.

SH-55 sealcoat will begin from Horseshoe Bend to Banks

Aerial view of SH-55 running alongside the river.

The Idaho Transportation Department will apply a sealcoat on State Highway 55 from Horseshoe Bend to north of Banks this summer. The sealcoat will preserve and extend the life of the pavement.

Starting Wednesday crews will begin work at the boundary of the Boise National Forest at milepost 91, about 12 miles north of Banks, and work their way 28 miles south towards Horseshoe Bend. This work is expected to be completed in early August.

During construction, motorists can expect:

SH-55 will be reduced to one lane with flaggers and pilot cars inside the active work zone.
The speed limit will be reduced and 12-foot width restrictions may be in place.
Work will take place Monday through Thursday from 6 a.m. to 9 p.m. and Friday from 6 a.m. to 12 p.m.
All lanes will be open on the weekends and outside working hours.

Due to the popularity of this highway with recreationists, drivers should plan for delays up to 30 minutes and consider using an alternative route.

There are several other work zones active on this highway. Workers will be close to traffic. Slow down and do not block driveways and entrances along SH-55.

Visit the project website at itdprojects.idaho.gov/pages/55sealcoat to learn more, sign up for email updates or contact the project team.

For real-time traffic impacts drivers are encouraged to use the Idaho 511 system to plan ahead for travel.

Work continues on SH-55 Little Goose Creek Bridge

Earlier this week the contractor for the Idaho Transportation Department resumed construction to replace the Little Goose Creek Bridge along State Highway 55 between New Meadows and McCall.

Drivers should plan for reduced speeds and intermittent flagging for most of construction. Later this summer during paving, SH-55 will be reduced to one lane with temporary traffic signals.

“This project has been extended due to weather, road conditions and unexpected contractor delays,” Associate Engineer B.J. Johnson said. “We are working with the contractor to ensure the work is completed as quickly and safely as possible, presumably this fall. We appreciate the community’s patience during this process.”

Work began in June 2024 to replace the bridge to enhance the overall safety, mobility and needs of the traveling public. The project also includes improving the nearby intersection at Last Chance Road and widening the shoulders of the highway. Last Chance Road and campground are closed until late 2025.

Learn more and sign up for construction updates on the project website at itdprojects.idaho.gov/pages/55-little-goose-creek.

Westbound I-84 on- and off- ramps closed at Burley Exit 208 starting next week

View of the Burley Interchange from the freeway

The westbound on- and off- ramps on Interstate 84 at State Highway 27 will close July 7 for repaving as part of the ongoing reconstruction of the Burley Interchange.

The closure will be in place from 6 p.m. July 7 through 9 p.m. July 24. If the schedule changes due to weather or unforeseen circumstances, updated information will be provided through roadside signage.

Drivers heading to the I-84 westbound on-ramp will be detoured north to State Highway 25, and then west to access I-84 at Exit 201. Westbound I-84 off-ramp drivers may exit early at SH-24 (Exit 211) or further west at SH-25 (Exit 201). See map attached. Detour signage is in place and will guide motorists through the project area. Please watch for crews, use caution, and drive safely.

Construction has been underway since 2024 to update the Heyburn and Burley Interchanges to meet growing traffic demands and is funded as part of Idaho Governor Little’s Leading Idaho transportation funding initiative. The Leading Idaho initiative allows department to take a deliberate approach to advance large projects that will enhance safety, improve mobility, strengthen Idaho’s economy, and positively impact the Magic Valley for years to come.

To learn more about the project that is expected to be complete in 2026, please visit itdprojects.idaho.gov/projects/i-84-burley-and-heyburninterchanges. Information about this closure, detour routes, and travel impacts for projects statewide is on 511.idaho.gov.

Chip sealing to begin Wednesday at I-86 and I-15 System Interchange

Aerial photo of the system interchange at Pocatello.

Beginning tomorrow the Idaho Transportation Department will chip seal the System Interchange in Pocatello. Once this work is complete, the roadway will be restriped to indicate the final lane configurations.

Chip sealing covers temporary lane markings used throughout various phases of construction and maximizes the taxpayers’ investment by extending the lifespan of the pavement. A sticky slurry is sprayed on the pavement then rock chips are applied on top for a long-lasting seal. This treatment protects pavement from sun, oxidation, weather, water, oil and gas, and increases traction for safety.

Tabs will be placed on the new chip seal to indicate lanes for the short time before striping work can occur.

The previous connection between I-86 and I-15 was originally built in the 1960s. Now nearing completion, the System Interchange is a $112 million redesign to improve safety and replace aging infrastructure that began construction in 2022.

Motorists should carefully follow signs and slow down to posted speed limits while traveling through the construction area. With crews working day and night at the System Interchange, it is especially important that drivers be alert and travel safely.

Motorists are encouraged to use 511.idaho.gov or the 511 app to keep track of related detours. Project details are available on ITD’s website at itdprojects.idaho.gov/i-86i-15-system-interchange.

Sealcoats for US-12 east of Kooskia begin tomorrow

Construction will start tomorrow to apply sealcoats to two sections of U.S. Highway 12 east of Kooskia. Sealcoats are necessary applications that will prolong the life of pavement. They improve the driving surface by waterproofing the roadway and increasing skid resistance for safety.

Work will start near the Lochsa Ranger Station at milepost 121 and move toward White Pine River Access. Then crews will shift to Powell at milepost 151 and work toward Lolo Pass at milepost 167. US-12 will be down to one lane with flaggers alternating traffic. Each section is anticipated to take between one to two weeks to complete before crews move on to the next.

Drivers are encouraged to follow all posted work zone speeds and be ready to stop for flaggers. Delays may range from 15 to 30 minutes, and a pilot car will escort motorists safely through the work zone. Crews appreciate the patience of the public during this important preservation work.

Construction will conclude by the end of July. Live traffic impacts across the region can be found by visiting 511.idaho.gov. Travelers can also dial 5-1-1 or download the app.