Four Mile Creek Bikeway

Boulder County’s Four-Mile Creek Bikeway project will create 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 BNSF 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.

Boulder County is currently working with BNSF Railway to navigate the state PUC process for approval and permitting. We are hopeful construction will begin in 2021.

Four Mile Creek Trail Underpass Project Area Map

Four Mile Creek Trail Underpass Project Area

Contact Us

Tonya Luebbert

Regional Trails Planner
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Courthouse Annex Building

2045 13th Street
Boulder, CO 80302
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Community Planning & Permitting
PO Box 471
Boulder, CO 80306