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After the Flood: Continuing Trail Repairs

Broken asphalt on Gregory Canyon Drive

99% of OSMP’s trail system now open, but some trails remain closed

For more than four months, trail crews with the City of Boulder’s Open Space and Mountain Parks (OSMP) Department have had a single focus: to re-open all trails damaged during the September Flood.

With the help of volunteers, they’ve re-built bridges. They’ve resurfaced miles of trails. They’ve re-routed trails around mudslides. And they’ve cleared massive amounts of boulders, snapped branches and other flood-related debris from trails.

As a result of volunteers and trail crews’ hard work, about 99 percent of OSMP’s trail system is now open. However, some trails sustained significant and severe damage and still require major repair efforts to reopen them to the public. Because of the expected limited availability of materials and contractors, who are working to complete numerous post-flood projects, completion of those projects may take some time.

Maps showing open and closed trails are available in the brown box under Re-opened Trails Maps. Nighttime and off-trail restrictions are shown on the trail maps.

Remaining long-term OSMP trail projects include (these trails are currently closed):

South Boulder Creek Bridge: The South Boulder Creek Trail bridge over South Boulder Creek was destroyed during the flood. Work is ongoing to replace the bridge.

Chapman Drive (currently open to trail users): The entire length of Chapman Drive is open to trail users, but it is still closed as an emergency access road because of flood damage. Cyclists and equestrians may find the road difficult to traverse. The road is a critical emergency access for first responders and OSMP is working to develop a plan for reconstructing the road to handle vehicles.

Related Photos

Chapman DriveDeep erosion gulley on Chapman DriveSwitchbacks on Chapman Drive

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Gregory Canyon Road: Much of the surface of the asphalt road was destroyed. It is a long-term road rebuilding project where OSMP is developing a reconstruction plan.

Related Photos

Damage to Gregory Canyon RoadDamage to Gregory Canyon RoadDamage to Gregory Canyon RoadAccess road to Gregory Canyon TrailheadAccess road to Gregory Canyon Trailhead

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Royal Arch Trail: The famous area trail sustained severe damage during the flood. The department is working with the climbing community to develop options for rehabilitating and repairing the trail.

Related Photos

Severe damage to Royal Arch trailSevere damage to Royal Arch trailSevere damage to Royal Arch trailUpper Royal Arch trail.

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Upper Saddle Rock Trail: There is a 10- to- 15-foot vertical wall of debris blocking the trail. Because of the location high up in the Boulder’s mountain backdrop, OSMP is unable to bring in heavy equipment to remove the flood debris. OSMP is considering rerouting the damaged section of the trail – an alternative already identified in the West Trail Study Area Plan.

Related Photos

Ruined stairs on Saddle Rock trailSaddle Rock trail damageSaddle Rock trail damageSaddle Rock trail damageSaddle Rock trail damageSaddle Rock trail damage

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