Railroad Quiet Zones: Project Group 1 - City of Longmont
Orange Train crossing 9th Avenue in Longmont with a white SUV and Blue car waiting.

Project Group 1 for the railroad Quiet Zones project includes the four crossings listed below with the improvements. Construction is anticipated to start in May 2025 and is anticipated to be completed by July 2026. It will include installation of asphalt pavement, concrete curb/gutter/sidewalk, raised medians, pavement markings, signage, fencing and installation of railroad gates with flashers.

 

Once construction of these and adjacent crossing is completed, a request will be filed with the Federal Railroad Administration to implement the Quiet Zone. If approved, the Quiet Zone will go into effect. See the project FAQs for more information about Quiet Zones and when train horns will stop sounding routinely at designated crossings.

 

Current Status

Updated Mar. 13, 2026.

 

3rd Avenue Crossing

  • Construction started March 11, 2026 and is expected to be completed in June 2026.
  • The north side of the intersection at 3rd Avenue and Atwood Street will be closed for 8-12 weeks.
      • No turns will be allowed to/from 3rd Avenue and Atwood Street north of 3rd Avenue.
      • A detour route will be in place for northbound Atwood Street from 4th Avenue using the alley to the east.
      • Two-way traffic will be allowed on southbound Atwood Street with the assistance of flaggers.
      • No parking on southbound Atwood Street between 3rd Avenue and 4th Avenue.
      • Sidewalks and crosswalks on 3rd Avenue across Atwood Street will be closed. A pedestrian detour will be in place from Collyer Street to 4th Avenue to Martin Street.
  • All lanes of traffic are currently open on 3rd Avenue.
      • Future lane closures will reduce traffic to one lane in each direction. Check back for updates.
      • A full closure of 3rd Avenue across the railroad tracks at Atwood Street is anticipated in early April for approximately 3 weeks. Please check back for updates.

 

17th Avenue Crossing

  • Work on the medians is starting Monday, March 16 and is expected to take approximately two weeks.
  • The two middle lanes of traffic will be closed in each direction on 17th Avenue across the railroad tracks between Shavano Street and Centennial Drive.
  • One lane of traffic will be open in each direction.
  • Left turns will be prohibited from Lamplighter Street and Meadow Street onto 17th Avenue during the closure. Alternate routes are advised.

 

9th Avenue Crossing

  • Work on the crossing gates and fencing is expected to occur in April 2026.
  • Lane closures on 9th Avenue are not expected.

 

Longs Peak Avenue Crossing

  • Construction is complete.

 

 

Proposed Improvements

  • 3rd Avenue/Atwood Street: Four-quadrant gate (quad gate) 
  • Longs Peak Avenue: Four-quadrant gate (quad gate) 
  • 9th Avenue: Two-quadrant gate with median 
  • 17th Avenue: Two-quadrant gate with median 

Schedule

  • Phase 1 (May 2025 – April 2026): Longs Peak Avenue, 9th Avenue and 17th Avenue
  • Phase 2 (March – July 2026): 3rd Avenue

 

Work Hours

  • Regular construction hours are Monday – Friday from 7 am – 5 pm.
  • Some work may occur until 7 pm and on Saturdays and Sundays, as necessary.

Questions?

For questions or concerns about the Quiet Zones project, please email QuietZones@longmontcolorado.gov or call 720-526-2044. More information about all four of the project groups can be found by visiting the Railroad Quiet Zones in Longmont webpage.

 

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