Basalt Avenue Pedestrian Underpass


On May 9, construction crews achieved a new milestone by setting the lid slabs for the South Phase of the Basalt Avenue Pedestrian Underpass project. The slabs represent the next step in completing the top of the tunnel, in addition to finalizing the roadway on State Highway 82. Traffic remains shifted to the north of the project. Crews anticipate moving the roadway to its final alignment on August 31.

A total of 8,655 cubic yards have been excavated for this improvement project. The remaining items for the construction team includes minimal concrete pouring for the tunnel slabs and walls, followed by the installation of storm drains, roadway striping and landscape seeding.  

As of early May, the North Phase of the project is an estimated 80% complete, with the remaining work involving electrical and landscaping installments. The South Phase is an estimated 40% complete.  The underpass is on schedule to be fully functional by mid-August and open for public use by the start of the new school year. Full completion is on schedule for late October. 

Project Schedule

The tentative schedule of major phases of work planned for the project includes:

September 2016 – March 2017: North Phase

  • Temporary bus stop placements – COMPLETE  
  • Building temporary lanes for vehicle traffic – COMPLETE
  • Removal of asphalt and underpass excavation – COMPLETE
  • Retaining wall construction along Basalt Avenue – COMPLETE

March 2017August 2017: South Phase

  • Asphalt, excavation and retaining wall work – IN PROGRESS
  • Final pavement, signals, striping, drainage & safety work
  • Reactivation of bus stations

September 2017 – October 2017: Final Phase

  • Trail construction
  • Curb, gutter and guardrail installation
  • Final striping and landscaping


In September 2016, the Town of Basalt began constructing a pedestrian underpass beneath State Highway 82 at mile point 23.1. The project will provide safety improvements for all modes of transportation by allowing non-motorist traffic to pass under the highway.

The completed underpass will connect the Roaring Fork Transportation Authority parking lot with the Basalt Store front and Bus Rapid Transit stations located at the intersection. Residents will also have easier, more convenient access to schools located to the north and south of the project.

The new, fully illuminated underpass is designed to be 140 feet long, 16 feet wide, and up to 9 feet tall. The construction of the underground path, combined with the installation of new traffic signals and an upgraded storm water drainage system, is anticipated to improve the flow of traffic and pedestrian safety along the highway. The Town of Basalt awarded Oldcastle/United companies the $6.2 million bid for this project.

Work Hours

Normal working hours for the project are Monday through Friday, from 7 a.m. to 7 p.m. No work is planned on holidays or weekends.

Traffic and Pedestrian Impacts

Additional impacts to travelers on State Highway 82 should be minimal. Five lanes of traffic will be maintained throughout the duration of the project with temporary asphalt pavement.  Pedestrians will continue to cross State Highway 82 at the temporary crossing and up valley RFTA transit users have a new longer path through the park and ride to the temporary up valley station.

Traffic speeds will be reduced to 35 mph in the work zone. Please use caution while traveling through the construction zone and follow flaggers’ directions. A width restriction of 11 feet is in place during working hours.

Contact the Project Team:

If you have questions about the project, please call the project hotline or email the public information team. You will receive a response within 24 business hours.


Phone                          970-718-5818