The shipment will be carrying a huge, Y-shaped pipe for an upgrade of the power-generating operation, one of the oldest of its kind in the nation, said Don Whitehair, manager of the Selway Corp. in Stevensville, Mont., about 30 miles south of Missoula.
The extra-big rig will weigh 185,000 pounds and be 95 feet long, 22 feet wide and a little more than 17 feet tall.
Whitehair's company would leave the Montana border around 10 p.m. Monday and move the pipe across Idaho on U.S. Highway 12 in a single trip that would end no later than 5:30 a.m. Tuesday, Whitehair said.
It will have to pull over every 15 minutes to allow cars to pass, but it should be able to go at the posted speed limits, Whitehair said.
This component is one of more than 150 that Selway Corp. has moved through Idaho and Montana on their way to Snoqualmie Falls and the only one that's this big, Whitehair said.
Getting permits for the Idaho portion of the trip has been one of the toughest parts of arranging the logistics, Whitehair said.
His company had to address 19 bullet items from the Idaho Transportation Department that seek details such as the type of clothing flaggers will be wearing.
Unrelated megaloads that Imperial Oil has been shipping from the Port of Lewiston to the Montana border on U.S. Highway 95 and Interstate 90 continue to be on hold following a non-injury accident earlier this week.
Those are carrying components of a processing plant that's being constructed in the Kearl Oil Sands in Alberta, Canada.