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September 1 2019 Vol. IV • No. 18
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Population Growth Sparks $340M Treasure Valley Project By Lori Tobias CEG CORRESPONDENT
The Idaho Transportation Department (ITD) has kicked off a $340 million project on the largest highway in the state. The work is happening over 11 mi. of I-84 in Ada and Canyon Counties, an area known as the Treasure Valley, the population hub of the state. It is the fastest growing area in Idaho, which is the largest growing state in the United States. More than 31 million trips occur on I-84, with two-thirds of those taking place between Ada and Canyon Counties. “It’s all about size,” said Jake Melder, ITD spokesman. “I-84 is just not big enough. Idaho is experiencing unprecedented growth and we’re now finding this Interstate is insufficient to carry the demands we have.” The Interstate is the primary commuter route, and also an important freight route and the lifeblood of Idaho’s agriculture community. The primary work will involve widening the Interstate, adding or modifying existing bridges, overpasses and interchanges. “There is going to be one at Northside that
is kind of a superstructure,” Melder said. “That’s going to be the biggest construction package we put out, and it should be going out in the coming weeks. The overall project includes: Karcher Overpass Specs • 276-ft., 7-in. long bridge • 43-ft. wide • 17-ft. minimum clearance of I-84 below Four interchanges: • Franklin Boulevard Interchange (IC) (Nampa) — minor ramp modifications • Northside Blvd IC — complete rebuild from diamond configuration to single point urban interchange (SPUI) • Karcher/Midland IC — ramp modifications and add a SB lane on bridge • Franklin Road IC (Caldwell) — minor ramp modifications Major bridges over I-84: • Karcher Road Overpass — complete replacement to allow additional I-84 lanes • Middleton Road Overpass — complete replacement to allow additional I-84 lanes • Ustick Road Overpass — complete replacement to allow additional I-84 lanes Major Bridges on I-84 (referenced facilities run under the Interstate): see I-84 page 2
The Idaho Transportation Department (ITD) has kicked off a $340 million project on the largest highway in the state.
The primary work will involve widening the Interstate, adding or modifying existing bridges, overpasses and interchanges.