Closures & Construction

Boulder County Transportation manages the construction projects for roads, bridges, pathways, drainage improvements and trails. The projects listed on this page are related to flood recovery and regularly scheduled roadway maintenance.

County Road Projects

The following county roadway projects result in travel impacts to both motorists and cyclists. All dates and times listed are weather dependent. Please visit this page regularly for updates on the projects listed and for information on new projects. View the Roadway Closure Map to see these projects and where roads/bridges remain closed due to the 2013 flood. 

  • Upper Lefthand Canyon Drive culvert install and road maintenance - June 23 through July 14 - Travel delays can be expected
    • Work Zone = Just past Sawmill Drive prior to the Ward town limits
    • 7 a.m. to 4:30 p.m. - Monday through Thursday - Until July 14 - Weather permitting
    • June 23 and 24 - 30 minute delays - Avoid the area, if possible 
    • June 25 until the end - single lane of alternating (flagger assisted) travel with minor 2 to 5 minute delays
    • Construction zone open Friday through Sunday
    • Work in anticipation of roadway resurfacing later this summer - date TBD
    • Project Contact - Andrew Barth - 303-441-1032 or email 
    • 20-miles of county roads to receive chips, sealant and new striping 
    • Work done Monday through Thursday - 7 a.m. to 4:30 p.m.
    • Avoid the following roads on work days, if possible:
      • Oxford Rd between SH 287 and East County Line Road on Monday, June 15 and Monday, June 22
      • North 119th St. between Oxford Rd. and Longmont limits on Monday, June 15 and Monday, June 22
      • North 115th St. between Oxford Road and Niwot Road on Tuesday, June 16 and Tuesday, June 23
      • Niwot Road between North 115th Street and East County Line Road - Wednesday, June 17 and Wednesday, June 24
      • Sunshine Canyon Dr between Boulder limits and CR 83 on Thursday, June 18 and Monday, June 22 for chip application and returning one week later for sealing operations
      • Ridge Road between SH 72 and Cold Springs Rd on Wednesday, June 24 and Wednesday, July 1
      • Hurricane Hill between Ridge Rd. and SH 119/Boulder Canyon Drive - Wednesday, June 24 and Wednesday, July 1
      • CR 84 from SH 7 to SH 7 - Thursday, June 25 and Thursday, July 2
    • Boulder County uses a smaller chip than is typically applied on other non-county maintained roads to create a smoother surface and reduce wear and tear on bicycles. 
    • Project Contact - Andrew Barth - 303-441-1032 or email 
  • 2015 Community Use Road Reconditioning in County Subdivisions
    • Work will commence June 1 and will be complete in September - weather permitting
    • Roadway resurfacing and rehabilitation of of concrete curbs and pedestrian crossings/sidewalk ramps
    • Longview Drive in Niwot
    • Idylwild Trail, Clubhouse Road and Carter Trail in Gunbarrel
    • Travel delays and parking restrictions can be expected 8 a.m. to 4:30 p.m. - Monday through Friday
      • Signage will be placed in advance of work to inform residents, and traffic control personnel will assist with moving travelers around work zones
    • Project Contact - Andrew Barth - 303-441-1032 or email 
  • Waterline relocation to result in trail closures/detours on N. 83rd in Niwot 
    • Multi-use path on west side of N. 83rd closed between Neva and Niwot roads
    • 24 hours a day 7 days a week
    • Until mid- to late-June, weather permitting (rains in May delayed the project roughly two weeks)
    • Detours will be established with barricades and signage
    • Intermittent lane closures on N. 83rd may be necessary to move equipment, but they will be minimal and short
    • Access to Lefthand Valley Grange park and ball field will be maintained. 
    • Crews are relocating a water line ahead of a culvert replacement/enlargement project at Dry Creek #2
      • The culvert work is a flood recovery-related project
    • Information - Andrew Barth - 303-441-1032 or email

Cycling - Projects impacting cycling

The following roads have travel restrictions for cyclists only due to safety concerns with the road surface and heavy construction traffic stemming from the 2013 flood event. Please respect the restrictions. Boulder County and CDOT are working to reopen these areas to cyclists as soon as possible. View the  Cycling Closure Map . (NOTE - The map is being updated so some closures and restrictions may not appear.)

Other Non-County Construction and Events resulting in travel restrictions

  • EPA remediation work in Fourmile Canyon - June 29 to July 3
    • Minor cleanup of site at Salina Junction
    • Flaggers on site to move traffic around work zone
    • 7 a.m. to 5 p.m.
  • Cherryvale Road closed 24-7 between Araphaoe Ave. and Wonderview Ct. - June 1 to Aug. 5
    • Work being completed by contractor on City of Boulder portion of Cherryvale Road
    • The intersection of Old Tale and Arapahoe Ave is also closed
    • Learn more on the City's Cone Zones Website
  • Private Water Utility Work in Overbrook Subdivision
    • Left Hand Water District replacing waterline in Overbrook Subdivision
    • Work will also involve street resurfacing in areas where waterline is replaced below the roadway
    • Work areas will include Spring Creek Trail, Fox Hunt Ct., and Gold Nugget Road. 
    • Work taking place 8 a.m. to 4:30 p.m., Monday - Friday
    • No road closures needed, but there may be short travel delays
    • Work will last through Oct. 2015
  • Private Gas Utility Work at Valmont Rd and 75th Street 
    • Alternating single-lane closures in place on 75th Street and sometimes on Valmont Road
    • Traffic control operations (flaggers) in place - 
    • 9 a.m. to 5 p.m.
    • Monday through Friday
    • Private crews replacing gas line for Xcel Energy
    • Contact - Travis Peters - Foreman Q3 Solutions - 720-454-5166
  • CDOT - SH 66 Overlay: US 287 to I-25
    • Begins Feb. 16, 2015
    • 6 a.m. to 8 p.m. - Monday through Friday from February to April - no significant travel delays expected
    • 8 p.m. to 6 p.m. - Sunday through Thursday - June and July - Expect delays 
    • Contact info - 844-253-3185 option #2
    • Project Email 

  • 2015 Special Events taking place throughout Boulder County
  • US 36 Express Lanes Project - Boulder to Denver - Learn more about lane and ramp closures and other travel restrictions - Work being completed by CDOT 

  • Learn about road closures in the City of Boulder at

Transportation Listserv 

Subscribe to the County's Transportation email listserv to receive timely information on projects, roadway closures, travel impacts and other information. 

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