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December 28 2025 Vol. III • No. 26
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Kiewit Enters Final Year of I-70 West Vail Pass Project By Irwin Rapoport CEG CORRESPONDENT
Kiewit Infrastructure is poised to enter the final year of construction for the Colorado Department of Transportation's (CDOT) I-70 West Vail Pass Auxiliary Lanes Project designed to improve safety and operations in both directions of the highway on West Vail Pass. The Eagle County project, anticipated to cost $325 million, began in August 2021 and is scheduled for December 2026 completion. The project limits extend from the East Vail Exit at mile point 180 to the Vail Pass Rest Area at mile point 190. The work includes a wide range of improvements to address the unique nature of Vail Pass. The highway, which has two lanes in each direction, has shoulders on either side and is separated by a green median. “The project is part of CDOT’s statewide 10-year plan and focuses on significant safety improvements for the I-70 mountain corridor,” CDOT Executive Director Shoshana Lew said. “The size and location of this project require more than one construction season. It is necessary to reduce crashes and improve travel times for travelers on this section of I70, which has the highest crash rate for all of I-70 in Colorado.” CDOT spokesperson Austyn Dineen provided more details. “This stretch of I-70 includes steep grades and tight curves and the intermingling of faster-moving passenger vehicles with slower-moving trucks that often results in inconsistent and slow travel times along the corridor,” she said. “The project is aimed at improving safety and traffic flow to create more reliable travel times along the I-70 Mountain Corridor. “The new eastbound I-70 auxiliary lane between MP 187.3 and 190 provides slower-moving traffic, such as commercial vehicles, with a dedicated climbing lane over Vail Pass,” she said. “This addition creates a safer buffer between slower traffic and faster-moving passenger vehicles, helping to address speed differentials that often cause safety con-
cerns and disrupt traffic flow along the corridor.” Crews are reconstructing two aging bridge structures at mile point 185.2 and relocating a 2-mi. section of the Vail Pass Recreation Trail to improve the recreational experience. Kiewit initiated a winter shutdown in early November to avoid interfering with winter and ski season travel, as well as snow removal and maintenance operations. Work is expected to resume in early April. During the work season, the DOT reduced lane and shoulder widths along I-70, instituted overnight single-lane closures in both directions of I-70 and created short-term stops during evening rock blasting activities. RS&H designed the project. see KIEWIT page 6
A Cat 315F L excavator sits atop a newly built retaining wall.
The Eagle County project, anticipated to cost $325 million, began in August 2021 and is scheduled for December 2026 completion.