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Other Trail Closures and Advisories
Chautauqua Trail closure
As part of routine maintenance, OSMP will close the Chautauqua Trail from 7:30 am- 5 pm, Monday, Oct. 2, through Thursday, Oct. 5th – weather permitting. OSMP may also close the Ski Jump Trail; all other trails will be open.
Sawhill Ponds closure
Sawhill Ponds east of Boulder will be closed starting as early as Monday, Oct. 2, to begin a multi-year project to improve the city’s main sanitary sewer line. In conjunction with this upcoming utility work, Boulder County Parks & Open Space will close parts of nearby Walden Ponds. These seasonal closures are intended to help expedite project work and protect wildlife from disturbances, and will be in place through March 15, 2024. Similar closures may be required next year, depending on construction progress this fall/winter season. For updated information, trail information and current closures across OSMP and Boulder County Parks & Open Space areas – including at Sawhill and Walden Ponds – please download the Boulder Area Trails App.
North Sky Trail construction impacts
The area north of Foothills North Trail between Hogback Ridge and US 36 is closed for construction of the North Sky Trail. Closures of that section of Foothills North Trail and the Foothills Trailhead are anticipated at times during construction. More information is available on the North Sky Project page.
Boulder Star Area Closure
The City of Boulder reminds everyone to view the Boulder Star from afar as it remains closed. No designated trail currently leads to the Boulder Star. Learn more about viewing the Boulder Star from afar.
Marshall Fire-related trail restrictions
On-trail-use-only regulations in the Marshall Mesa area continue to be enforced as the area has changed since the Marshall Fire and hazards may be present. Some properties affected by the Marshall Fire remain closed while staff monitor ongoing ecological and agricultural needs on those properties.
Creek Closures to Limit Spread of Invasive Mudsnails Instituted
The City of Boulder has closed access to South Boulder Creek at the South Mesa Trailhead to prevent the spread of a highly invasive aquatic species, New Zealand Mudsnails (NZMS). The South Mesa Trailhead and the Mesa Trail will remain open. Learn more about the NZMS closures.
Rock Island 1 in Boulder Canyon closed
Rock Island 1 is closed. The rock fractured and part fell onto the Boulder Canyon Creek path. Sections of the remaining rock have been evaluated as unstable so it is closed until recommended bolting can be completed.