Underway since May 2018, substantial progress has been made on the Interstate 84/86 Salt Lake City Interchange in Cassia County. With this project, the Idaho Transportation Department is replacing the old interchange with a new structure that will meet current standards and provide a better driving experience for motorists.
“This is a vital travel and commerce corridor for not only this area, but for the entire state,” said ITD Project Manager Travis Hitchcock. “Our goal is to construct an interchange that will serve motorists for many years to come.”
As work proceeds, drivers should anticipate a continuation of reduced speeds and changing traffic patterns through the work zone.
“There will be varying detours over the next several months as work on specific portions of the structure occurs,” stated ITD Project Inspector Jack Kelly. “It’s important that motorists not follow their GPS but instead pay close attention to signage which is in place to safely direct motorists through the area.”
Construction is scheduled to finish by late 2020.
Wadsworth Brothers Construction, of Draper, Utah is the prime contractor on this project.
Beginning tomorrow night (Oct. 29) at 10 p.m., a new detour will be in place for motorists heading east on Interstate 84/86 from Burley toward Pocatello. During this time, crews will install new structures to hold overhead signage.
Weather permitting, this temporary traffic pattern is expected to last until 6 a.m. on Wednesday, October 30.
“Unlike previous detours that have been occurring in this area, this portion of construction requires that we direct motorists completely off of the interstate,” said ITD Project Manager Travis Hitchcock. “Directing traffic to Idaho Highway 77 and Idaho Highway 81 will allow for safe installation of the structures without traffic traveling underneath.”
This is part of the Salt Lake Interchange replacement project, underway since May of last year. Construction is scheduled to finish by late 2020.
Drivers should still anticipate reduced speeds through the work zone and pay close attention to signage in place to safely direct motorists through the area.
Wadsworth Brothers Construction, of Draper, Utah is the prime contractor on this project.
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.
Several intersections on Idaho 55 will be closed beginning Oct. 1. Construction crews are placing concrete gutters along the roadway. Access at each intersection’s will remain closed for 2-3 days (weather permitting) while the concrete hardens.
What to expect:
- All work will be done during daytime hours.
- Work is anticipated to take approximately two weeks to complete (weather permitting).
- Work will be conducted between Bruneau Hwy. to Edwards St. on the north; Bruneau Hwy. to 9th St. on the south.
- Side streets will be closed to all traffic while work is being done and while concrete hardens. Closures will be staggered.
- Major intersections will be reduced down to one lane, but will remain open at all times. Steel plates will be placed over the gutter work while concrete hardens.
Flaggers will assist with the gutter operations at the major intersections.
The contractor will be placing the next set of girders tonight, Oct. 1. What to expect:
- ID-55 and the Snake River Bridge will be closed for up to 30 minutes each time one of the girders are being placed.
- Sunny Slope Road southbound will be reduced to one lane between Lowell and True roads. The lanes will be restricted from noon to 2:00 am each night to stage the bridge girders.
- Work will generally be done between 10:00 pm and 2:00 am.
- The work will be noisy.
Due to inclement weather, the traffic detour planned for Wednesday of this week has been rescheduled for the early morning hours of Thursday, September 12. This detour will affect motorists heading eastbound on Interstate 84 from Burley toward Pocatello. During this time, crews will work to place concrete on the deck of the newly constructed steel girder bridge.
Weather permitting, this temporary traffic pattern is expected to be in effect between the hours of 2 a.m. and 7 a.m.
This is part of the Salt Lake Interchange replacement project, underway since May of last year. Construction is scheduled to finish by late 2020.
Drivers should still anticipate reduced speeds through the work zone and pay close attention to signage which will be in place to safely direct motorists through the area.
Wadsworth Brothers Construction, of Draper, Utah is the prime contractor on this project.
Interstate 84 will be closed overnight between the Karcher/Midland and Northside interchanges on Monday, Sept. 16 through Thursday, Sept. 19. The closures will allow crews to safely remove the wooden forms that temporarily supported the new bridge deck this summer.
- Westbound I-84 will be closed for two nights – Sept. 16 and Sept. 17. Each night I-84 will be closed from 10 p.m. to 6 a.m.
- Eastbound I-84 will be closed for two nights – Sept. 18 and Sept. 19. Each night I-84 will be closed from 10 p.m. to 5 a.m.
During the four overnight closures, motorists will exit I-84 at Karcher/Midland or Northside and follow a detour along Karcher Road. Flaggers will direct traffic. View the detour map.
Lane restrictions and flaggers will also be in place on the Northside Boulevard between the ramps each night while crews begin to work on the new bridge.
The new Karcher Overpass is on schedule to re-open later this fall. Reconstruction of the Northside Interchange has begun and will continue through early 2021.
For more information about the reconstruction of I-84 in Canyon County, visit itdprojects.org/84Corridor. To receive construction updates; text 84corridor to 555888. “Drive Idaho,” ITD’s new podcast series on all things I-84 in Canyon County, is available for download on Spotify and Apple Podcast and other major podcast sharing sites.
Work is expected to occur Thursday, Sept. 5 on the Interstate 84 westbound Exit 208 off-ramp near Burley. The Idaho Transportation Department will mill off the existing pavement and inlay the area with new asphalt to improve the overall condition of the roadway.
The Exit 208 westbound off-ramp will be closed while this work takes place, so motorists will need to utilize Exit 211 or Exit 216 for access to Burley.
Repairs are anticipated to take place between 8:00 a.m. – 5:00 p.m. and be complete within a day.
There will be temporary closures on Idaho Highway 55 at the Snake River Bridge in Marsing while girders are placed for the new bridge.
Girders are large horizontal beams that support the surface of the bridge. Each girder weighs 141,000 pounds and is 148 feet long. Current plans call for girders to be placed overnight on Tuesday Sept. 3, Thursday Sept. 5, Friday Sept. 13, and Monday Sept. 16. This is subject to change.
Sunny Slope Rd. southbound will be reduced to one lane between Lowell and True road. The lanes will be restricted from noon to 2:00 am each night to stage the bridge girders. Placement of the girders will generally occur between the hours of 10:00 pm and 2:00 am. Traffic will be stopped for up to thirty minutes while each girder is placed. Each night up to three girders will be placed.
This work is part of a two year-long project to replace the Snake River Bridge in Marsing The project will improve safety and driving conditions on the bridge, which is the primary river crossing for the area. More information can be found at https://itdprojects.org/marsing55improvements/.
Ahead of constructing additional lanes on Interstate 84 in Canyon County, the Idaho Transportation Department is reconfiguring westbound lanes of the Interstate near the Franklin Blvd. interchange.
Currently, three westbound lanes are reduced to two lanes with the far left lane merging into the center lane. In the new configuration, the left lane will no longer merge, remaining a travel lane. The far right lane will end, used as the off-ramp to Franklin Blvd. A similar configuration is on westbound I-84 at the Garrity Blvd. interchange, where the Interstate is reduced from four to three lanes.

“This reconfiguration maintains the existing capacity of I-84 during construction,” said ITD Project Manager Styles Salek. “With this change, we remind motorists to slow down, plan ahead and pay attention in construction zones.”
In order to promote the safety of motorists and construction crews, ITD has partnered with the Idaho State Police to provide enhanced patrols throughout the duration of the project.
This change will allow crews to begin adding lanes in the I-84 median between Karcher/Midland and Franklin Boulevard. The addition of lanes is part of the ongoing I-84 corridor project from Nampa to Caldwell. Improvements are expected to improve safety, address congestion and benefit the regional economy for many years.
For more information about the I-84, Karcher to Franklin project, listen to the Drive Idaho podcast, visit itdprojects.org/84corridor or text 555888 to request construction updates. You can also contact ITD at 84corridor@itd.idaho.gov and (208) 334-8002.
The Idaho Transportation Department is issuing a travel advisory on Idaho Highway 55 near Marsing for July 3, 2019.
Construction to rebuild ID-55 through downtown Marsing and the bridge over the Snake River will impact travel around the City of Marsing’s annual July 3rd Fireworks Extravaganza at Marsing Island Park. Traffic will be reduced to a single lane on the highway north of the bridge and in town. No left-turns will be allowed in town during the event.
The Snake River Bridge is closed to pedestrians and bicyclists. The City of Marsing has arranged for a free shuttle service to and from the event. Please see the event map below for details.

ITD encourages those planning to attend the event consider using U.S. 95 to reach Marsing. Consider carpooling to alleviate congestion as over 5,000 visitors are expected to arrive for the celebration. Plan extra time for the return trip. Please exercise patience and kindness as you leave.
ITD reminds those who will be drinking during the event to make a plan in advance to get home safe. The Department is partnering with law enforcement to increase DUI patrols during the Fourth of July week.