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Staff say Entrance to Aspen NEPA reevaluation is underway; some design modifications under study

Joint meeting of the Aspen City Council and Pitkin County Board of County Commissioners · February 9, 2026
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Summary

City staff explained a NEPA reevaluation of the Entrance to Aspen project is underway to confirm whether the 1998 preferred alternative remains suitable. Technical analyses, traffic modeling and public engagement are planned; preliminary cost estimates for a package similar to the preferred alternative were cited at $300–$400 million.

Deputy City Manager Tyler Christophe and Transportation Director Lynn Rumbaugh briefed elected officials on the NEPA reevaluation for the Entrance to Aspen project. The presentation emphasized that a reevaluation is not a new environmental impact statement and will not introduce new alternatives outside the 1998 record of decision; rather, the team is screening potential modifications (roundabout reconfiguration, enhanced trail connectivity, slip lanes, pedestrian underpasses and realignment options) to determine whether the preferred alternative still meets current needs.

Staff identified CDOT as the lead agency and the Federal Highway Administration as the final approval authority, and said Jacobs is the consultant performing technical analyses (noise, air, water and traffic modeling). "So just to finish up with some key takeaways for both elected boards, the reevaluation is in full swing," staff said. They also offered a very preliminary cost range of $300–$400 million for a package similar in scale to the original preferred alternative and said federal and state partners are expected to cover the majority of funding with local contributions for locally owned infrastructure.