Northside Boulevard detours scheduled Friday and Saturday nights during interchange girder placement

Construction on Northside Interchagne

NAMPA – Northside Boulevard will be closed overnight under I-84 Friday and Saturday (Jan. 31 and Feb 1) while crews place six steel girders for the I-84, Northside Interchange in Nampa.

Detour route for Northside Closure
Detour route for Northside closure

The girders will support the center half of the reconstructed interchange of I-84 and Northside Boulevard. Road closures will begin at 10 p.m. and will end at 7 a.m. each morning. One lane of I-84 will remain open in each direction. Flaggers will direct Northside Blvd. traffic through a detour route.

  • Southbound traffic on Northside Boulevard will be directed to enter westbound I-84, exit at the Karcher Road Interchange (Exit 33A), and travel eastbound on I-84 to access Northside Boulevard (Exit 35).
  • Northbound traffic on Northside Boulevard will be directed to enter eastbound I-84, exit at the Franklin Road Interchange (Exit 36) and travel westbound on I-84 to access Northside Boulevard (Exit 35).

“When completed in 2021, the new Northside Interchange bridge will be the longest single-span bridge in Idaho,” said Mark Campbell, ITD’s GARVEE project manager. “This is no small effort and we appreciate the patience of the traveling public.”

The girders will be delivered to the construction site in pieces and assembled in a closed lane of I-84. When assembled, each girder will be 5 feet, 10 inches tall and 220 feet long. The process will require close to 4,000 bolts and multiple large cranes.

ITD is replacing the Northside Interchange with a Single Point Urban Interchange for safer, more efficient travel. Work on the second half of the interchange bridge will begin later this year.

For more information about I-84 improvements in Canyon County, visit or listen to the Drive Idaho podcast.