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.
- Subscribe to the Transportation Email Listserv to receive timely project updates and other construction information
- Use the Road Service Request Form to let us know about an issue on area roads
County Road Projects with Travel Impacts
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.
- 95th Street (Lookout to Plateau) Reconstruction
- Expect infrequent, intermittent travel delays starting April 22 while crews begin operations
- Full construction expected to start week of April 29
- Daytime, weekday lane reductions and shifts – Expect longer delays controlled by flagging personnel
- Project Contact – Andrew Barth – 303-441-1032
- Railroad Crossing Quiet Zone Implementation Project along Diagonal Highaway/SH 119
- 2nd Avenue at Diagonal – COMPLETE
- Independence Road at Diagonal – COMPLETE
- 55th Street at Diagonal – COMPLETE
- Monarch Road at Diagonal – May 6 to May 20
- This location will require a full road closure for approximately two weeks (24-hours a day, weekends included). Vehicles will be detoured to 79th Street.
- Jay Road at Diagonal – April 23 to May 7
- Lane closures and shifts during the day
- Niwot Road at Digonal – TBD
- Lane closures and shifts during the day
- Project Contact – Andrew Barth – 303-441-1032
- Lefthand Canyon reduced to one-lane at Glendale Gulch
- Culvert/roadway project requires single-lane reduction and traffic signal use 24/7 at Glendale Gulch (mile marker 7)
- Project will reduce the curve at Glendale Gulch by realigning the road
- Traffic signal will be in place 24/7 until May/June
- Project Contact – Andrew Barth – 303-441-1032
- Culvert/roadway project requires single-lane reduction and traffic signal use 24/7 at Glendale Gulch (mile marker 7)
- N. 55th Street CLOSED for culvert replacement
- N. 55th CLOSED at Boulder/Whiterock Ditch, just south of Pioneer Road
- CLOSURE in place 24/7 until end of May
- Project Contact – Andrew Barth – 303-441-1032
- Fourmile Canyon Flood Recovery Work – Expect delays on Fourmile Canyon Drive and Gold Run Road
- Normal Hours – 8 a.m. to 4:30 p.m. – Monday through Friday
- Delays of up-to 15-minutes in/at:
- Lower Fourmile Canyon (just north of CO 119/Boulder Canyon Drive to Salina Junction)
- Gold Run
- Upper Fourmile between Wall Street and Sunset – Gravel roadway resurfacing will start Monday, April 29
- Upper Fourmile Canyon (west of Salina Junction)
- Project currently on hold until spring 2019
- NON-RESIDENT CYCLING RESTRICTIONS IN FOURMILE CANYON DURING WORKING HOURS – SEE BELOW
- Project Contact – Andrew Barth – 303-441-1032
Cycling – Projects impacting cycling
- Fourmile Canyon Drive/Gold Run Road DAYTIME-WEEKDAY CYCLING NON-RESIDENT RESTRICTIONS
- No recreational/non-resident cycling in Fourmile Canyon
- 8 a.m. to 4:30 p.m. – Monday through Friday
- Residential cycling exception – Residents must contact Boulder County Transportation for pass
- Residents can contact Andrew Barth (info below) to obtain a residential cycling pass
- SEE MAP
- Restrictions in place due to increased volume of large truck traffic associated with three construction projects
- Thank you for following restrictions
- Project Contact – Andrew Barth – 303-441-1032
- No recreational/non-resident cycling in Fourmile Canyon
View the Cycling Closure Map .
Other Non-County Construction and Events resulting in travel restrictions
- SH 119/Boulder Canyon Drive Reconstruction Project – CDOT April 2019 to February 2021
- Expect travel delays and roadway closures
- For up-to-date information
- Call 720-465-6898
- Email – CO119@PublicInfoTeam.com
- SH 17O/Eldorado Springs Rd – CDOT culvert replacement starting end of Feb. 2018
- Traffic signal will be in place while the road is reduced to one-lane
- Project completion = late spring/early summer 2019
- Northern Water – Southern Water Supply Project
- Northern Water is constructing a new pipeline between Carter Lake in Larimer County and Boulder Reservoir in Boulder County
- The project will require short travel delays on Boulder County Roads including (see map):
- N. 75th Street
- N. 73rd Street
- N. 63rd Street
- Hygiene Road
- Niwot Road
- Project Website
- Contact Information
- Special Event Permit Requests – Pending & Approved taking place throughout Boulder County
- Learn about road closures in the City of Boulder at www.BoulderConeZones.net.
- Learn about road closures in Longmont
- Learn about road closures in Lafayette
- Learn about road closures in Louisville
- Learn about road closures in Erie