Drivers in the Boise and the broader Treasure Valley should prepare for overnight closures along Interstate 84 as construction crews continue work on a major interchange project.
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According to the Idaho Transportation Department, the temporary closures will allow crews to install 20 girders for the region’s first tri-level flyover ramp at the future interchange between I-84 and Idaho State Highway 16.
“These closures will allow crews to set 20 girders for the Treasure Valley’s first-ever tri-level flyover ramp at the future I-84 and State Highway 16 interchange,” the Idaho Transportation Department said in a March 2 news release.
Eastbound lanes of I-84 will close overnight between Exit 38 at Garrity Boulevard in Nampa and Exit 42 at Ten Mile Road in Meridian.
The first closure will begin 10 p.m. Wednesday, March 11, and continue until 5 a.m. Thursday, March 12, transportation officials said.
Drivers traveling eastbound during the closure can use Franklin Road as a detour, while westbound lanes will remain open.
A second overnight closure is scheduled to begin 10 p.m. Friday, March 13, and continue until 5 a.m. Saturday, March 14. During that time, westbound I-84 traffic will be reduced to two lanes.
Construction activity will intensify over the weekend with an extended closure of the same eastbound stretch of I-84.
The highway will be closed from 6 a.m. Saturday, March 14, through 5 a.m. Monday, March 16, allowing crews to continue installing structural components of the interchange.
“Traffic will exit and re-enter using the new ramps,” the state roads agency said.
Officials also noted that additional closures may occur between March 17 and March 23, and nighttime lane restrictions are expected to continue through the spring depending on weather and construction progress.
Construction activity will also affect traffic along Idaho 16 north of its intersection with Idaho State Highway 44.
The transportation department said lane and barrier shifts will occur overnight as crews widen the highway and connect a future southbound off-ramp to the main roadway.
“During this time crews will be widening SH-16 to the west and connecting the future southbound off-ramp to the mainline,” the state agency said.
Nighttime flagging operations will guide vehicles through the work zone, and reduced speed limits will be in place while crews shift traffic.
The construction work is part of a larger effort to build a new interchange connecting I-84 with the Idaho 16 extension.
Transportation officials have compared the project to Boise’s Flying Wye interchange, where Interstate 184 branches off from I-84 west of downtown.
Once completed in 2027, the interchange will allow drivers to travel between I-84 and the north-south Idaho 16 corridor without stopping at traffic signals, significantly improving travel efficiency across the region.
According to the transportation department, the project is designed to improve regional mobility, expand freeway access in the rapidly growing Treasure Valley and shorten commute times for thousands of drivers.
Funding for portions of the project comes from transportation expansion and congestion mitigation programs under the Leading Idaho initiative led by Brad Little.
Officials are encouraging drivers to plan ahead and stay alert when traveling through construction zones.
Motorists can check current road conditions using Idaho’s 511 travel alert system or sign up for project updates by text.
Safety officials also recommend that drivers:
Transportation officials say following these guidelines helps protect both drivers and construction crews working along the busy interstate corridor.
Originally reported by Hali Smith in Idaho States Man.
