Four Mile Creek Bikeway

4-Mile Creek Path BeforeBoulder County’s Four-Mile Creek Bikeway project is the final phase in creating a continuous, safe bikeway along SH 119 between Boulder, Gunbarrel, Niwot and Longmont.

The first segment connected the eastern terminus of the City of Boulder's Four-Mile Creek Greenway multiuse path with the northbound lanes of SH 119.

The second segment will create an underpass below the Burlington Northern Santa Fe railroad tracks connecting the Four-Mile Creek Bikeway to the Cottonwood Trail. Railroad approval for this final connection is pending.

The project was and will continue to be funded by a combination of a Federal Transportation Enhancement Grant obtained in 2007 and a dedicated fund for trail implementation passed by Boulder County voters in 2001 which was extended by voters in 2007 until 2024.


Matt Wempe, AICP
Regional Trails Planner
Boulder County Transportation
303-441-3900 or via email