Boulder 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. See the project area map below.
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.