Resilient St. Vrain

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.

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


Sandstone Reach



Sandstone Reach follows the St. Vrain Creek through the Sandstone Ranch Nature Area and surrounding open space. Construction began in November 2016 and continued through spring 2018.

Goals of work in this area were to:

  • restore the flood-damaged St. Vrain Greenway. The trail is now open in this area.
  • stabilize creek banks to protect trails, access roads and infrastructure from future flood damage
  • help nature re-establish vegetation and wetlands habitat for fish and wildlife. Nearly 200,000 native plants were added. View a list of species planted through the Resilient St. Vrain Project >

City Reach

The City Reach follows the St. Vrain Creek through urban, developed areas of Longmont. It stretches from where Left Hand Creek flows into the St. Vrain (east of Martin Street) west to Airport Road. Construction work here will:

  • restore the flood-damaged St. Vrain Greenway
  • protect people, property and infrastructure by improving the creek channel
  • reduce future flood risks by shrinking 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


City Reach 2: Main Street to BNSF Railroad Bridge area


This reach has been divided into two sections.

  • City Reach 2A: Main Street to Colorado Way. Construction began in August 2018 and is expected to last approximately 12-15 months.
  • City Reach 2B: Colorado Way to approximately 400 feet upstream of the BNSF railroad bridge. Construction is anticipated for mid-2018 and expected to last approximately 12-15 months.
  • BNSF Railroad Bridge will be replaced as part of an agreement between Longmont and BNSF.
  • South Pratt Parkway Bridge replacement began in early 2018 and is anticipated for completion in late 2018. However, final paving of the bridge and road surfaces will be dependent on weather conditions and may be delayed to spring 2019.
  • The St. Vrain Greenway will be closed during much of the work in this area. Closures are anticipated beginning late summer 2018. Detour routes will be posted.

Izaak Walton Pond Reach: 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 the BNSF Railroad Bridge and Lykins Gulch. Read more about the feasibility study >

  • Because of favorable construction costs in earlier reaches, some federal funding will be available for Longmont to use in the Izaak Walton Pond reach (from BNSF Railroad Bridge upstream to Sunset Street)
  • Izaak Walton Reach 1: Upstream of BNSF Railroad Bridge to Boston Avenue. Design phase late 2018-2019. Construction anticipated in 2020.
  • Izaak Walton Reach 2: Boston Avenue to Sunset Street or Fairgrounds Pond.
  • Boston Avenue Bridge will be replaced
  • Sunset Street Bridge has been replaced

Future Reaches: Upstream of Sunset Street to Airport Road

  • This area includes Golden Ponds Nature Area and Lykins Gulch
  • Creek crossings at Hover Street and Airport Road are in this reach
  • Final design work on these areas has not yet begun, and funding has not yet been secured
  • Roger's Grove/Hover Road Reach: currently unfunded. Completing work through the first segment of this reach would achieve the project's goal of removing from the 100-year floodplain all of the developed portions of Longmont downstream of Hover (except for Roger's Grove)
  • Lykins Gulch Reach: currently unfunded

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