Boston Avenue Bridge Replacement
CLOSEDACTIVE
Bridge reconstruction project on Boston Avenue. The replacement affects access to the St. Vrain Greenway underpass connecting downtown to the trail network.
Live status
Trail status in Longmont
What's open, what's closed, and what's being worked on right now.
Currently closed
Oligarchy Greenwaysidewalk along Spencer St south of 20th St · Closed · Reconstruction · Since Oct 5, 2026 · Est. reopening Dec 7, 2026 · Primary greenway: No · Pedestrians approaching Hover St. from the west will not be able to travel south at the bridge. This restricts continuing east as well. · Contact: Erin ProvoProject detail →
CLOSEDMonitored projects
What we’re watching
Izaak Walton Reach 2
CLOSEDACTIVE · EST. FALL 2026
USACE flood mitigation project closing the St. Vrain Greenway between Izaak Walton Park and Ken Pratt Blvd. The greenway underpass and adjacent path segments are closed to all users through construction completion.
Resilient St. Vrain — Areas of Focus
CLOSEDACTIVE
Overview of all active RSVP construction zones and detour areas across the St. Vrain corridor.
Resilient St. Vrain Project
CLOSEDACTIVE · EST. MULTI-YEAR
Multi-phase flood recovery project rebuilding the St. Vrain Greenway through central Longmont. Involves channel widening, bank stabilization, and trail reconstruction across multiple reaches.
Rough & Ready Greenway Improvements
CLOSEDACTIVE · EST. LATE 2026
Greenway reconstruction project along Rough and Ready Ditch. Involves trail surface improvements and drainage work.
St. Vrain Greenway Phase 13
CLOSEDACTIVE · EST. SPRING 2027
New 2-mile eastern trail extension under construction, connecting the existing St. Vrain Greenway toward the eastern edge of Longmont.
Latest change · The city updated this page. Added: "September 30, 2026"
Sources
Where the data comes from
longmontcolorado.govBoulder County Trail ClosuresArcGIS Trail Status MapLongmont Public Works NewsPrimeGov agenda portal
LATE checks these sources on a regular schedule and flags changes that are likely to affect trail access. Some checks are automated; others are verified manually before an issue goes out.