Areas of Work & Schedule

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Resilient St. Vrain: Restore & Revitalize


Resilient St. Vrain work areas

The Resilient St. Vrain project is divided into work areas called reaches. A reach is an engineering term used to describe a particular section of river or creek.

The portion of St. Vrain Creek that runs through urban, developed areas of Longmont is known as City Reach, while the area further east, which includes the Sandstone Ranch Nature Area, is called Sandstone Reach.

Construction on this very large project will take place in phases beginning on the downstream end. The work will take many years, including time for vegetation to take hold and regrow. All construction dates and costs are estimated and subject to change as the project progresses.

City Reach

The City Reach stretches from where Left Hand Creek flows into the St. Vrain (east of Martin Street) west to Airport Road. Construction work here will:

  • restore flood-damaged St. Vrain Greenway trails
  • protect people and property by reducing the size of the floodplain
  • complete work in an environmentally responsible manner

View funding status and estimated construction dates for reaches >

City Reach 1: Left Hand Creek confluence (east of Martin Street) to Main Street

Under Construction: Construction began in February 2017 and is anticipated to continue through spring 2018.

  • Main Street Bridge has been replaced
  • Creek work in Dickens Farm Nature Area (Main to Martin Streets) will be completed concurrently with other work in this area.
  • St. Vrain Greenway trails are currently closed through the area. Estimated re-opening is spring 2018.

City Reach 2: Main Street to BNSF Railroad Bridge area

Design work is under way for this area, which has been divided into smaller sections:

  • City Reach 2A: Main Street to approximately 1200 feet upstream of the South Pratt Parkway Bridge
  • City Reach 2B: Approximately 1200 feet upstream of the South Pratt Parkway Bridge to approximately 400 feet upstream of the BNSF railroad bridge
  • South Pratt Parkway Bridge replacement is anticipated to begin in 2017
  • BNSF railroad bridge will be replaced
  • Sunset Street Bridge has been replaced and is now open

Learn more about the design process involved with a large-scale project like Resilient St. Vrain >

City Reach 3: Upstream of BNSF Railroad Bridge to Sunset Street

Longmont has partnered with the U.S. Army Corps of Engineers on a feasibility study regarding work in the area located between approximately 400 feet upstream of the BNSF railroad bridge and Airport Road. Read more about the feasibility study >

  • Because of favorable construction costs in earlier areas, federal funding will be available for Longmont to use in the area along Izaak Walton Pond to Sunset
  • Boston Avenue Bridge will be replaced

Future Reaches: Upstream of Sunset Street to Airport Road

  • This area includes Golden Ponds Park and Lykins Gulch
  • Creek crossings at Hover Street and Airport Road are in this reach
  • Design work on these areas has not yet begun, and funding has not yet been secured

Sandstone Reach

Sandstone Ranch goals and progress

Under Construction: Construction began in November 2016 and is anticipated to continue through 2018, with periodic work shutdowns to respect avian nesting schedules.

Sandstone Reach follows the St. Vrain Creek through the Sandstone Ranch Nature Area and surrounding open space.

Goals of work in this area are to:

  • restore the flood-damaged St. Vrain Greenway trail. Estimated re-opening in spring 2018.
  • stabilize creek banks to protect trails, access roads and infrastructure from future flood damage
  • help nature re-establish vegetation and habitat for fish and wildlife

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