Phase 13 will extend the St. Vrain Greenway Trail more than two miles northeast from the Sandstone Ranch Nature Area to the trail network at St. Vrain State Park. This link will eventually connect to the Weld Legacy Trail east of I-25 in the Town of Firestone. The St. Vrain Greenway is also part of the statewide Colorado Front Range Trail, which is planned to run from Wyoming to New Mexico.

 

The work includes two pedestrian bridges—one north of Colorado Highway 119 over St. Vrain Creek and another south of the highway overlooking St. Vrain Creek. A concrete underpass will also be built beneath the highway to help pedestrians and bicyclists cross safely.

 

Other improvements include adding erosion control measures to help prevent soil from washing away, installing new fencing to guide trail users and protect nearby areas, and landscaping to revegetate areas impacted during construction.

 

The project is partially funded by the Denver Regional Council of Governments (DRCOG) Multimodal Options Funds Transportation Improvement Program (MMOF TIP) grant, which is administered by the Colorado Department of Transportation (CDOT).

 

The City adopted the St. Vrain Greenway Master Plan – East Corridor Update in 2001. The plan was developed with consultants, key stakeholders, and residents. It identified a trail route along the St. Vrain Creek corridor between Main Street and where St. Vrain Creek meets Boulder Creek.

 

 

Project Updates

April 3, 2026

Trail Construction along Sandstone Ranch Nature Area:

• Placement of crusher fines is underway
• Retaining wall work continues
• Pedestrian ramps are in construction, with concrete paving scheduled as the next step

Bridge & Underpass Construction:

• Work is underway with crews preparing the site
• Activities include excavation for culvert placement and other foundational work

 

March 18, 2026

Overnight work is scheduled to set up the Phase 1 traffic pattern.

• Sunday, March 22: Crews will stripe the road, shift eastbound lanes and place concrete barrier
• Monday, March 23: Westbound lanes will be shifted and traffic signal head work will be completed

 

March 17, 2026

• Construction of the pedestrian underpass beneath CO 119 begins.
• Starting Monday, March 23, a new traffic alignment will be in place on CO 119, located west of the St. Vrain Creek Bridge.
• The new traffic pattern will move eastbound traffic to the right shoulder and route westbound traffic through temporary center lanes to accommodate construction in the westbound lanes.
• Two lanes of traffic will remain open in each direction.
• This new traffic configuration will continue through late August.
• Drivers should follow posted signs through the construction zone.
• The speed limit will be reduced to 45 MPH through the work zone.

 

March 11, 2026

• Access to the dirt trail connecting the upper Sandstone Ranch Parking Area near the Visitor Center and Sandstone Drive will be closed through late April due to electrical work and concrete trail construction in the area.

 

February 23, 2026

• Contractors experienced excavating issues on 2/21. This delayed the concrete pour until 2/24, extending the Sandstone Drive closure to Friday, Feb. 27.

 

February 19, 2026

• Beginning Wednesday, Feb. 25, shoulder and median closures will be in place on Highway 119 as crews start clearing and grubbing in preparation for construction.
• The Sandstone Drive closure will be extended until Thursday, Feb. 26.

 

February 6, 2026

• Sandstone Drive will be closed for reconstruction between the turn off to the Sandstone Ranch Parking Area and the Visitors Center from Saturday, Feb. 21, through Wednesday, Feb. 25. The closure is necessary to allow new concrete to properly cure.
  During this time, visitors should use the Sandstone Ranch Parking Area or parking lots at the soccer fields. The park and St. Vrain Greenway will remain accessible from those locations. Please follow posted signage for trail access.

 

January 23, 2026 

• Beginning Monday, January 26, access to the dirt trail from the Sandstone Ranch Parking Area near the Visitors Center to Sandstone Drive will be intermittently closed during active work to allow equipment access and ensure user safety.

 

December 19, 2025

• Beginning Tuesday, December 23, a portion of the Sandstone Ranch Parking Area near the Visitors Center will be closed for the duration of the project.
• Access to the trails and the Visitors Center will remain open.
• Additional parking is available at the Visitors Center and the Sandstone Soccer Complex.

 

Schedule

• Public Process – Completed, 2001 (as part of the St. Vrain Greenway Master Plan)
• Design Bid – Completed, summer 2021
• Design – Completed, February 2025
• Construction Bid – Completed, September 2025
• Construction – January 2026 to spring 2027