New I-86 bridge opens at Chubbuck

A new three-lane Interstate 86 bridge at Chubbuck is now open as construction crews head into Thanksgiving week. The new bridge over the Union Pacific Railroad adds capacity, improves traffic flow, and is designed to last 80 years.

While the bridge is complete and open, work continues nearby with the installation of a new sound wall. In addition, paneling will be installed on the bridge to protect the railroad tracks from any debris falling off the bridge.

Crews will continue to work on the I-86/I-15 System Interchange through the winter months. The next major milestone is opening the new I-15 mainline roadway slated for mid-December. Following that contractors will begin demolition of the old I-15 bridges.

This week crews will work until noon Wednesday and return to the construction site on Monday. Still, it is important that drivers be safe while travelling through the System Interchange, particularly with increased holiday traffic.

“Please pay attention to construction signs, be courteous, follow posted speed limits, and drive safe so everyone can go home safely, including workers on the project,” Engineering Manager Aaron Baird said.

East 1500 North Bridge over I-15 closed until further notice

Damaged girder on East 1500 North Bridge over I-15

The East 1500 North Bridge over Interstate 15 near Shelley will be closed until further notice. A vehicle travelling northbound on I-15 today struck the bridge causing significant damage to a girder. Traffic is currently detoured via South 45th West.

“We’ll have to keep the bridge closed until we can fully inspect the damage,” Operations Engineer Greydon Wright said. “Our bridge crew will come in to do the inspection and decide what work will need to be done to repair it.”

The incident also necessitated the closure of the right lane of northbound I-15 to allow crews to clean debris from the road and ensure the safety of the travelling public.

Travelers are reminded to know before they go and check for traffic impacts.


Lane restrictions June 20-25 for Perrine Bridge and Glenns Ferry Bridges

TWIN FALLS – Lane restrictions on Perrine Bridge and Glenns Ferry Bridges are scheduled for June 20-25. Drivers can expect traffic delays across the bridges while Idaho Transportation Department (ITD) crews conduct routine bridge inspections.

Glenns Ferry Bridges

June 20-23 from 7 a.m. to 7 p.m.

Traffic on both east- and westbound bridges at milepost 121.6 on Interstate 84 will be reduced to one lane in either direction when crews begin work on the eastbound bridge with an 11-ft width lane restriction starting Tuesday, June 20 from 7 a.m. to 7 p.m. Westbound right-lane closure will begin when eastbound work is completed.

Perrine Bridge

June 24-25 from 5 a.m. to 3 p.m.

Traffic will be reduced to one lane in either direction while crews move from the south end of the bridge to the north end with an 11-ft width lane restriction:

– Southbound right lane closure: Saturday, June 24 from 5 a.m. to 3 p.m.

– Northbound right lane closure: Sunday, June 25 from 5 a.m. to 3 p.m.

“These special bridge inspections only take a couple of days to accomplish, while routine inspections take a week or more and both are important to ensure the safety and longevity of our state bridges,” said ITD Bridge Inspector Amy Bower.

ITD, Idaho State Police, and local law enforcement caution motorists to slow down and pay attention when driving in work zones, where increased speeding fines and other penalties apply. Motorists are encouraged to plan ahead and dial 5-1-1 or visit for information on the state highway or interstate system.

US-30 Heyburn Bridge repair resumes

SHOSHONE – Construction work resumed today on US-30 Heyburn Bridge over the Snake River. The epoxy overlay repair is expected to be completed by early June. Motorists can expect lane restrictions during construction and are advised to slow down.

ITD, Idaho State Police, and local law enforcement caution motorists to slow down and pay attention when driving in work zones, where increased speeding fines and other penalties apply. Motorists are encouraged to plan ahead and dial 5-1-1 or visit for information on the state highway or interstate system.

US-30 project to begin next week on Heyburn Bridge

Image of Heyburn Bridge on US-30

Work is expected to begin Monday (June 13) on the U.S. Highway 30 Heyburn Bridge over the Snake River. In the coming weeks, crews will apply a sealing treatment to the driving surface to extend the life of the bridge.

“Besides protecting the surface from water and other elements, bridge joints that allow the bridge to expand and contract with the weather will also be replaced as part of this project,” ITD Project Manager Bruce Christensen said.

Construction is expected to occur Monday through Friday between the hours of 7 a.m. and 6 p.m. Occasional work may occur on Saturdays as needed.

While work is underway, lane restrictions will be in place. Adjustments to the traffic signal on the north side of the bridge may also be needed during construction.

“We will work with our contractor to make adjustments to our work schedule and traffic control as necessary,” Christensen stated.

Motorists are advised to slow down, watch for signs and use caution when traveling through the area. Drivers should plan ahead and expect delays.

Cannon Builders is the prime contractor on this project that is expected to be complete this summer.

Bridge replacement underway on State Highway 46 in Gooding County

Map of Big Wood River Detour on SH-46

Work began earlier this week to replace the bridge over Big Wood River at milepost 112.9 on State Highway 46 north of Gooding. Built in 1947, the current structure has reached the end of its service life.

“We will raise the height of the new bridge approximately 3.5 feet,” ITD Project Manager Tom Logan said. “The additional height will allow for more flood water to pass underneath the structure.”

The new bridge will also be both wider and longer to increase mobility and safety.

Initial work will first include setup of traffic control and then demolition of a portion of the old bridge. While work is underway, traffic will be reduced to a single lane. Temporary traffic signals will be in place to direct motorists throughout the duration of the project.

“Drivers can anticipate wait times between two and five minutes when traveling through the area,” Logan stated. “Lane width will also be restricted to 12 foot during construction, and we advise motorists to plan ahead and use caution while traveling through the work zone.”

Short-term closures of SH-46 will also be required for different portions of the project to allow for crews to safely complete various stages of work. When these closures occur, signs will be in place to direct motorists through a detour route. Approximately four closures are anticipated throughout construction.

Cannon Builders of Idaho are the primary contractor on this replacement project that is expected to be complete this fall.

Bridge inspection to take place next week on Interstate 84 near Jerome

Image of ITD under-bridge inspection truck

Drivers can expect additional lane restrictions near Jerome next week as crews from the Idaho Transportation Department (ITD) perform a routine bridge inspection on Interstate 84.

On April 15 crews will inspect the bridge located near milepost 163. They will examine the bridge deck and deploy ITD’s under-bridge inspection truck from the eastbound lanes of I-84 and from the county road on the north side of the interstate.

Traffic will be reduced to one lane while inspections are underway. Work is expected to take place from 8 a.m. to 12 p.m.

“We will begin with a left-lane closure in the I-84 eastbound lanes and then alternate to a right-lane closure as our inspection progresses,” said ITD Bridge Inspector Amy Bower. “These lane restrictions are separate from the nearby work zone between Jerome and Twin Falls, so it’s important that drivers are attentive when traveling on this section of I-84.”

Drivers are urged to exercise caution near the work zones and watch for crew members and equipment. ITD appreciates the patience and cooperation of those driving through the area.

Replacement of N Canal Bridge to begin next month in Jerome County

Graphic of N Canal project road closures

Early November, work is expected to begin on replacing the N Canal Bridge on Idaho Highway 25 east of Jerome. Built in 1956, the current bridge has reached its life expectancy. The new structure will be both longer and wider than the current bridge, and also support heavier load capacities.

“The new bridge will facilitate space for construction of a future pedestrian walkway,” said ITD Project Manager Tom Logan. “It will also allow for existing utilities to be placed underneath the structure.”

As part of the project, the adjacent ID-25 approaches will be brought up to grade as well.

“Updating the grade of the bridge, along with the northbound and southbound approaches, and increasing the width will improve safety for the traveling public,” stated Logan.

During the first phase of construction, the South 100 W approach will be closed with traffic diverted through the Producers Livestock parking lot. The North 100 W approach will then be closed during the second phase of construction.

Traffic on ID-25 will remain open but reduced to one lane in each direction throughout the duration of the project. Barrels will be in place to safely guide motorists through the work zone.

Click here to see a graphic of the closures.

“Most of our work on the bridge must be completed while the canal is dry,” said Logan. “We expect the majority of work to be done by March of next year, with remaining items to be completed by the Spring.”

Coldwater Group, Inc. of Pleasant View, Utah is the primary contractor for this project.

Crews successfully slide new I-84 bridge into place

demolition of the blacks creek bridge begins

Normally, bridges moving is not something an engineer wants to see, but this weekend construction crews slid the first of two new bridges at the Interstate 84 Blacks Creek Interchange sixty feet into place — where it will stay for decades to come.

The slide-in-place maneuver was designed to minimize impacts to the heavily traveled Interstate. Crews construct the bulk of the new bridge right next to the existing structure. When ready, the old bridge is demolished and the replacement structure is slid into place.

“The driving force behind choosing a lateral bridge slide method was our focus on the people we serve and their ability to get where they need to go.” said Patrick Kelly, the ITD project manager overseeing the work. “We were able to keep lanes open during the entire bridge construction process. Once it was ready, we closed the eastbound lanes, demolished the old structure, pushed the new bridge into place, and are wrapping up construction on the adjacent roadway. In the end, we will have closed interstate lanes of traffic for weeks rather than months.”

The whole process, from demolition to reopening traffic, will take two to three weeks. Normal bridge replacements can take several months. With the new bridge in place, crews have just a few final items to complete, including work at the bridge abutments and repaving approaches.

To get the bridge from temporary footings to its permanent home, crews lay down Teflon pads and cover them with dish soap. Then, heavy machinery pushes and pulls the structure into place. It’s a surprisingly effective way to reduce friction and easily move the massive structure.

“Seeing how smoothly the bridge slid into place was very satisfying.” said Kelly. “It has been months of planning, preparation, and a lot of hard work to get to this point. The crews from Knife River have done a wonderful job and should be very proud of the work they’ve done.”

This method has been used before in the Gem State when, in 2014, the Lardo Bridge on ID-55 in McCall was replaced. There, as it is at Blacks Creek, the highway is an essential connection and lengthy disruptions are very impactful.

The second bridge for the westbound lanes has been constructed next to the old structure. Crews are currently finishing up the eastbound side of the interchange, including work on ramps and Blacks Creek Road. They will be ready to slide the westbound bridge into place in early August using the same method.

For more information about the project, visit

Drivers can expect increased traffic delays during Salmon Falls Creek Bridge work on US-30

Next Wednesday and Thursday (Oct. 30 & 31) the Idaho Transportation Department is planning to place a bridge deck on the newly constructed Salmon Falls Creek Bridge near Banbury Hot Springs in Twin Falls County.

“While the deck is being placed, motorists will encounter longer than normal delays,” says ITD Project Manager Kenny Lively. “Although most construction delays have been minimal, this upcoming work could result in wait times upwards of 30-40 minutes. As such, we are recommending motorists utilize an alternate route during these days.”

Weather permitting, placement of the deck is expected to take place between 10 a.m. and 3 p.m. each day. In the mornings and evenings, when work is not underway, the area will be open to single lane traffic with a temporary traffic signal in place.

This is part of a larger bridge replacement project that has been underway since June of this year. When completed, the new structure will be both wider and longer – accommodating two 12-foot lanes in each direction, and incorporating a new left-turn lane as well.

Construction on the project is expected to be complete by early summer of next year.

The general contractor is RSCI from Boise.