The latest news and information about the District and Preserves.

Ravenswood Closure

Ravenswood Open Space Preserve and parking lot closing for construction beginning August 19.

Hwy 17 Trails Survey

Help us plan future regional trail connections across Highway 17

Temporary Public Access Closures

Due to ongoing maintenance and monitoring activities around the radar tower, the following areas at Mount Umunhum are temporarily closed:

  • The area surrounding the base of the radar tower (outside of the covered walkway)

All other areas of the summit remain open.

Temporary Closure Area

In November 2017 the area surrounding the base of the radar tower was closed while staff worked to remediate peeling paint on the exterior of the building. This work was completed in May 2018.  During the final phases, small pieces of concrete were falling off the exterior and out of an abundance of caution for public safety, the area surrounding the base of the radar tower remains closed to public access. While staff continues to assess future repair options, visitors can now access the East Summit of Mount Umunhum via a covered walkway next to the radar tower. The exterior area around the radar tower itself will remain closed to public access.

More Information

  • District staff are continuing to re-assess the radar tower and identify any additional repairs, to seal and retain the structure long-term.  This work will take place over the next few years and it may be necessary to close the area for assessment and repair work.

Oljon Trail Construction

Work is wrapping up at El Corte de Madera Creek Preserve on a new section of the Oljon Trail that will connect to Springboard Trail. This new 1.3-mile multi-use segment through mixed redwood and tanoak forest creates a new perimeter trail that reduces the need for preserve visitors to access Highway 35 during their visit. As part of this project, crews will permanently remove the portion of the Steam Donkey trail that connects to Highway 35.  Approximately 0.6 miles of steep and poorly drained trail will be removed, including two culvert crossings across intermittent streams, and the area restored to natural habitat. The new trail segment is anticipated to open later this summer.

The project is the the final element of the El Corte de Madera Creek Watershed Protection Plan, designed to reduce sediment delivery to the watershed, and enhance the trail experience for preserve visitors. 

As part of the project, Midpen staff:

  • Constructed 6,050 linear feet of new trail;
  • Converted 800 linear feet of road to trail;
  • Restored 500 linear feet of old tractor roads
  • Installed two new bridges



Wildflowers in bloom on Midpen preserves.

Mountain Lion Activity

Midpen Biologists believe that one or more mountain lions may live within and around Rancho San Antonio Open Space Preserve. While these lions are usually most active between dusk and dawn, sightings at Rancho San Antonio have been reported year round at all hours of the day.  Find out more about Mountain Lions and how to stay safe while out on the trails.

Now Hiring

Join our passionate, talented and dynamic team as we work collaboratively towards our vision.

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Photo Contest

The Midpeninsula Regional Open Space District invites photographers to enter its 10th Annual Digital Photography Competition, running now through May 31, 2019.

We are seeking compelling digital images of nature, capturing the diversity of our open spaces.

Learn more