Important Updates:

The city expands beta to preview its new website and gather feedback. | More Info


The City of Boulder welcomes your feedback. Use our Inquire Boulder customer service tool to tell us what’s on your mind.

  • OSMP Trails & Recreation
  • OSMP Visitor Info
  • OSMP Get Involved
  • OSMP Nature & Restoration
  • OSMP - About
  • OSMP Kids & Families
  • OSMP Plans & Reports
  • OSMP en Español

OSMP Projects

The City of Boulder’s Open Space and Mountain Parks (OSMP) Department will highlight large projects for 2020 on this page. 

Boulder Star closure to remain in effect

Oct. 20, 2020: Open Space and Mountain Parks will continue an existing closure around the Boulder Star area on Flagstaff Mountain and will replace temporary fencing with reinforced wood fencing in the area. Learn more about the Boulder Star closure.

Continuing Xcel transmission infrastructure project

Xcel Energy has completed much of this work. Occasional short-term user impacts may happen while restoration work is completed.

Bear Canyon Reroute Project

OSMP will begin a trail project to re-route a 1/3-mile section of Bear Canyon Trail starting the week of May 24, and expected to last through November 2021. Bear Canyon Trail will be closed to public access from 6 am – 5 pm Mon-Fri during this timeframe due to rockfall hazard from the trail construction site. The trail will be open evenings and weekends. Additionally, intermittent Saturday closures along the path are anticipated to occur in the coming months when Xcel Energy begins replacement of the powerline towers in Bear Canyon. The trail project will re-route a section of Bear Canyon Trail away from sensitive streamside habitat, improve trail conditions, and reduce trail susceptibility to flood damage. View a map of the planned trail closure pdf.

Anemone Hill Trail Construction

Trail Closures - updated May 17, 2021

May 24 update: Helicopter hauling on May 24 was a success! OSMP’s contractor utilized a helicopter to haul 64 pallets of stone (average 1500 pounds per pallet) to be used for constructing stone steps on the new Anemone Hill Trail. The entire helicopter operation lasted about 4 hours.  OSMP thanks the Boulder community for respecting the area closure to help make helicopter work efficient and safe.

Some photos taken of the helicopter work are below.

Helicopter work at Anemone

Anemone Trail work

February Update: Trail construction is continuing over the winter as weather allows on the new Anemone Trail loop. The existing Anemone Trail has been re-opened, while an area closure is in-place where trail construction is actively continuing. The area has been signed accordingly. Please stay out of closed areas due to rockfall risk, mechanized equipment, and rock blasting in these areas, and do not remove or damage signs. Trail closures are expected to change as-needed for public safety and project efficiency as work continues.

View a map of the current area closure pdf

Why are trail closures needed?

Mechanized equipment, rock blasting, rockfall, and other construction hazards necessitate closure of Anemone Hill trails during construction hours.

Anemone Hill trails are expected to be open evenings and weekends.

Nearby trails, especially around the Centennial and Settlers Park Trailheads and the Red Rocks Area, will have short-term closures when heavy equipment and helicopters are operating in the area to support the Anemone Hill project.

PLEASE DO NOT ENTER CLOSURE AREAS OR REMOVE CLOSURE FENCES AND SIGNS   – doing so puts yourself and other visitors at risk, slows down construction, and increases project costs. No trespassing in closure areas. Violators will be ticketed and fined up to $1000 and/or 90 days in jail.

Anemone Hill project update, June 4, 2020 

Trail construction has started! The crew has mobilized equipment to the site, and begun work on a large stone retaining wall and stone stairs. Here, the crew is preparing a stone that has been drilled and split to be moved by cable to the project site.

Trail construction work



Anemone Hill

Project Overview

What work is being done?

OSMP is constructing a new three-mile loop trail – this new route will bring people to many of the existing popular locations on Anemone Hill, and some new areas. Additionally, existing undesignated trails in the area that are in poor condition and which negatively impact habitat will be closed and re-vegetated to reduce impacts to the environment.

View a map of the planned project pdf.

What can I expect to see during the project?

  • Mechanized equipment is being used for this project. Helicopters are expected to be used for mobilizing materials for some aspects of the work. Trail work with machine
  • Rockfall control fencing will be installed on the eastern part of Anemone Hill – this is needed to prevent rockfall over Boulder Canyon during construction. This barrier will be removed before project completion.

When is this project occurring?

The project will start as early as Thursday, May 14, 2020 and is expected to take approximately two years to complete.

Why is this project being done? 

The new trail will replace existing trails, which have significant erosion and widening issues. These issues are negative impacts to the surrounding environment and are impossible for OSMP to adequately maintain. OSMP trail staff and ecologists have collaborated on the trail design with the goal of providing a fantastic recreational opportunity for trail users while minimizing negative impacts to the environment and habitat.

The Anemone Hill project is part of the OSMP West Trail Study Area (WTSA) pdf management plan, which was approved by OSMP’s Board of Trustees and Boulder’s City Council and involved significant public input.