What's open, what's closed, and what's being worked on right now.
Last checked Jul 13, 2026
Bridge reconstruction project on Boston Avenue. The replacement affects access to the St. Vrain Greenway underpass connecting downtown to the trail network.
Latest change · The city updated this page. Removed: "Building Services online permitting portal is currently experiencing technical issues"
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.
Latest change · The city updated this page. Removed: "Building Services online permitting portal is currently experiencing technical issues"
Overview of all active RSVP construction zones and detour areas across the St. Vrain corridor.
Latest change · The city updated this page. Removed: "Building Services online permitting portal is currently experiencing technical issues"
Multi-phase flood recovery project rebuilding the St. Vrain Greenway through central Longmont. Involves channel widening, bank stabilization, and trail reconstruction across multiple reaches.
Latest change · The city updated this page. Removed: "Building Services online permitting portal is currently experiencing technical issues"
Greenway reconstruction project along Rough and Ready Ditch. Involves trail surface improvements and drainage work.
Latest change · The city updated this page. Removed: "Building Services online permitting portal is currently experiencing technical issues"
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: "This month’s construction activities:"
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.