Northbound I-25 between Mulberry Street and Mountain Vista Drive closed overnight on Aug. 28, Southbound I-25 closed overnight on Aug. 29

August 22, 2019 - Northeastern Colorado

FORT COLLINS – Overnight on Aug. 28, the Colorado Department of Transportation and contractor partner, Zak Dirt, will set concrete bridge girders for the new Vine Drive bridge over northbound Interstate 25. From 7 p.m. on Wednesday, Aug. 28, until 7 a.m. on Thursday, Aug. 29, all northbound I-25 traffic will detour off the highway and onto the immediately adjacent I-25 east frontage road. 

A similar closure will occur overnight on Thursday, Aug. 29 when crews set girders over southbound I-25. 

The schedule is weather-dependent and subject to change. Any changes to the closure dates will be posted on the project website and on message boards along I-25. The Vine Drive and I-25 east frontage road intersection, which has been closed since June, will reopen in advance of the I-25 full closures and is part of the suggested detour route. Uniformed traffic control officers will direct traffic as needed during the full closures. A detour map is posted at

Detour for northbound I-25 full closure between Mulberry Street and Mountain Vista Drive (7 p.m. on Aug. 28 – 7 a.m. on Aug. 29)

  • All through traffic will be directed off the highway at exit 269A Mulberry Street (Colorado Highway 14). Exit 269B for westbound Mulberry Street into Fort Collins will remain open.

  • Turn east (right) on Mulberry Street

  • Turn north (left) on the I-25 east frontage road

  • Continue north (straight) across Vine Drive (County Road 48)

  • Stay on I-25 east frontage road

  • Turn west (left) on Mountain Vista Drive (County Road 50)

  • Turn north (right) onto northbound I-25

Detour for southbound I-25 full closure between Mountain Vista Drive and Mulberry Street (7 p.m. on Aug. 29 – 7 a.m. on Aug. 30)

  • All traffic will be directed off the highway at exit 271 (Mountain Vista Drive / CR 50)

  • Turn east (left) on Mountain Vista Drive (CR 50)

  • Turn south (right) on the I-25 east frontage road

  • Turn west (right) on Mulberry Street (CO 14)

  • Enter southbound I-25

Although this project is not related to the larger expansion of I-25 happening from Berthoud to Fort Collins, the new bridge at Vine Drive can accommodate future expanded capacity on I-25 as well as provide increased safety with new left turn lanes on Vine Drive at the I-25 frontage roads, as part of CDOT’s Whole System. Whole Safety initiative. 

Vine Drive between the I-25 frontage roads will remain closed through the end of the year. Since demolishing the old bridge in early June, the contractor has constructed the bridge abutments and supports. After the concrete girders are placed by crane next week, the team will form and pour the new concrete bridge deck. The 3.5-mile detour route utilizes N. Timberline Road, Mountain Vista Drive and the I-25 east frontage road. A detour map is available at

Starting at 9 a.m. on Monday, Sept. 9 the intersection of Vine Drive and the I-25 west frontage road will be closed through late October for reconstruction. During the closure, crews will raise the bridge approach and intersection several feet. For motorist and crew safety, all traffic will detour around the intersection while extensive earth work and grading activities are underway in the narrow work zone. Access for emergency responders only will be provided through the work zone as an alternative to Vine Drive. Access to all businesses along the west frontage road will be maintained from the south. A detour map is posted at The schedule is weather-dependent and subject to change.

Detour for Vine Drive and I-25 west frontage road intersection full closure (9 a.m. on Monday, Sept. 9 – late October)

Detour for northbound I-25 west frontage road to Vine Drive

  • From Mulberry Street turn north on Timberline Road

  • Take Timberline Road to Vine Drive

Detour for eastbound Vine Drive to I-25 west frontage road

  • From Vine Drive turn south on Timberline Road

  • Turn east (left) on Mulberry Street

  • Turn north (left) on the I-25 west frontage road


The existing structure will be demolished and replaced with a new bridge carrying Vine Drive over I-25. Improvements will also be made to bridge approaches on Vine Drive and the I-25 frontage roads. Project completion is anticipated in early 2020. Originally built in 1966, the existing bridge warrants replacement as part of the Colorado Bridge Enterprise (CBE).

For additional information or to sign up for project updates, call the project hotline at 970-541-8955, send an email to [email protected] or visit the website at

For real-time information regarding traffic impacts on any state highway, motorists can sign up for CDOT email and text alerts by visiting and clicking on the small envelope icon at the bottom right of the page. Updates are also available via Twitter @coloradodot and Facebook (



The following tips are to help you stay safe while traveling through maintenance and construction work zones.

  • Do not speed in work zones. Obey the posted speed limits.

  • Stay Alert! Expect the unexpected.

  • Watch for workers. Drive with caution.

  • Don't change lanes unnecessarily.

  • Avoid using mobile devices such as phones while driving in work zones.

  • Turn on headlights so that workers and other drivers can see you.

  • Be especially alert at night while driving in work zones.

  • Expect delays, especially during peak travel times.

  • Allow ample space between you and the car in front of you.

  • Anticipate lane shifts and merge when directed to do so.

  • Be patient!


To heighten safety awareness, CDOT recently announced its Whole System — Whole Safety initiative. This project takes a systematic statewide approach to safety combining the benefits of CDOT’s programs that address driving behaviors, our built environment and the organization's operations. The goal is to improve the safety of Colorado’s transportation network by reducing the rate and severity of crashes and improving the safety of all transportation modes. The program has one simple mission—to get everyone home safely.


CDOT has approximately 3,000 employees located throughout Colorado, and manages more than 23,000 lane miles of highway and 3,429 bridges. CDOT also manages grant partnerships with a range of other agencies, including metropolitan planning organizations, local governments and airports. It also administers Bustang, the state-owned and operated interregional express service. Governor Polis has charged CDOT to further build on the state’s intermodal mobility options.