ITD: Be aware of lane changes around Nampa bridge construction

June 23, 2014 

This graphic created by the Idaho Transportation Department shows the lane configuration for a stretch of I-84 at Nampa's Northside Boulevard through the summer.


The Idaho Transportation Department says drivers were confused Monday morning by the traffic changes at one Nampa exit, where Granite Construction of Salt Lake City is in the middle of a $4 million overhaul of the bridges over Northside Boulevard and the nearby railroad.

The work will block off one lane of first eastbound and then westbound Interstate 84 through the summer, as the contractor finishes stretches of the bridges. But, ITD says two lanes of traffic will be preserved for each direction the whole time. For the eastbound lanes currently being worked on, the left lane crosses over to run alongside westbound I-84, while the right lane continues straight over its normal bridges.

The traffic pattern around exit 35 was changed Sunday night.

"There was significant confusion this morning, with the vast majority of traffic getting over into the left lane and going into the crossover, while almost no one was staying in the right lane. However, both lanes continue east and are part of I-84," ITD project manager David Barrett stated in a Monday press release.

For anyone exiting I-84 there, Northside Boulevard is reduced from five lanes to three — one in each direction with a center turn lane — through the project area.

The work will replace some bridge decks and repair others for both structures.

The Northside interchange is ranked eighth in the state for traffic volume with 80,000 vehicles per day, according to ITD. The bridges were all built in 1966.

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