Iron Horse Bicycle Classic Road and Trail impacts 2017


Highway 550 road closure information 

When: Saturday May 27, 2017 8:30am to 1:30pm 

Where: Hwy 550 from Purgatory Resort to Silverton 
**** Animas Valley redirect will take place from 7:00am to 9:00am. Southbound traffic will be rerouted onto County Road 203 from Hermosa To the start of County Road 203 just north of the city limits of Durango, Northbound traffic leaving Durango during this period will be traveling in Southbound lane of Highway 550 from the city limits north to Hermosa, then Merging back in to northbound lane

Durango Downtown road closure information 
When: Sunday May 28, 2017 6am to 6pm. 
Where: Main Street between 8th Street and 10th Street, East Second Avenue between 8th Street and 9th Street 
8th Street from Main Ave east to Eighth Ave (crossing allowed at Third Ave) Seventh Ave to Sixth Ave Intersection of 10th Street and Fifth Ave Eighth Avenue up to Fort Lewis College.
BMX Course setup Main Ave west side between 8th and 9th street parking lane and one southbound lane of traffic. 3:30pm to 2am Saturday May 27th.

Trail Impacts 
When: Sunday May 28, 2017 10:00am to 6pm 
Where: Nature Trail, Rim Trail, Chapman Hill Access Road, Factory Trails, Lamppost Trail.


US 550 Molas Pass Crib Walls Project to Begin

DURANGO – The Colorado Department of Transportation (CDOT) and contractor Rock & Company will soon begin work to improve the safety and integrity of US Highway (US) 550 by replacing several under-highway downhill retaining walls, known as crib walls, on Molas Pass, just south of Silverton in San Juan County.  Two separate crib walls will be reconstructed, one at mile point (MP) 68.6 and one at MP 68.75, approximately two miles south of Silverton.  During construction motorists will be restricted to single-lane alternating traffic through the project zone

This will be a busy summer for cycling events in the region, and project schedulers have taken note.  For the Iron Horse Bicycle Classic Road Races on Saturday, May 27, US 550 between Purgatory and Silverton will be closed to all motorized traffic from 8:30 a.m. to 1:30 p.m., as in past years, to allow for the safety of the riders.  Within the project zone, cyclists will encounter a short, single-lane section within the project limits.  After the road is reopened that day, motorists will encounter one lane, alternating closures controlled by flaggers,

Two weeks later, during the Ride the Rockies event, cyclists will be traveling between Durango and Ridgway via US 550 on Wednesday, June 14.  Although the project area will remain restricted to single lane traffic during the event, project staff are working to make sure that the riders and their support teams experience minimal delays.

Additionally, the project team will remain in close communication with the Town of Silverton to inform the mountain community of work anticipated during weeks of special events, such as the 4th of July holiday.

Work is scheduled to begin Monday, May 8 and be completed by mid-October 2017. Please note, the start date may be delayed due to potential spring avalanche and slide danger posing a threat to crews.


  • From May 8―May 15, there will be occasional single lane restrictions controlled by flaggers as crews mobilize and bring in equipment and set up work zones.

  • From May 15―October 15, anticipated travel impacts are single-lane, alternating traffic 24 hours a day, 7 days a week, controlled by flaggers or portable traffic signals.

  • Wait times will typically be up to 20 minutes during work periods, which are Monday through Saturday, 7 a.m. to 7 p.m.

  • Wait times during non-work periods will be approximately 10 minutes or less.

  • There may be occasional Sunday work days and these will be announced in advance.


For updates to this project, please call (970) 209-3332 or email

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