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Rock blasting ODOT used rolling slowdowns to keep traffic moving during the blasting stage last summer. Pilot vehicles slowed I-5 traffic to roughly 30 miles an hour from both Glendale and Rogue River. I-5 on-ramps in the project area were also temporarily closed during the rolling slowdowns. “The rolling slowdowns gave Knife River about 20 minutes to blast and clean up any rock that blew onto the highway,” Paselk said. Climbing lane construction required closing the I-5 emergency shoulder and placing concrete barriers to separate traffic from the construction work. According to Paselk, an estimated 250,000 cubic yards of soil and rock were moved to clear room for the new northbound truck climbing lane. Knife River transferred the material to three locations along I-5 — the Merlin interchange, the Hugo interchange and slightly north of the Hugo interchange along Old Highway 99.

December 6, 2013