About the Midpeninsula Regional Open Space District

Measure AA Regional Open Space
Access, Preservation and Restoration Bond

Project Updates | Future Projects | Next Steps | Oversight | Ballot Language

Measure AA is a $300 million general obligation bond approved in June 2014 by over two-thirds of Midpen voters. Proceeds from bonds, which will be sold in a series over approximately the next 20-30 years, will be used to:

  • protect natural open space lands

  • open preserves or areas of preserves that are currently closed

  • construct public access improvements such as new trails and staging areas

  • restore and enhance open space land, which includes forests, streams, watersheds, and coastal ranch areas.

During this transition year 2014-15, Midpen is focused on preparing for the first bond issue and implementing Measure AA projects that were approved by the board of directors at its public meeting in October.

We’ll be highlighting our Measure AA funded projects throughout the year with signage, special events, and information though our newsletters, email, website, and social media. We encourage the public to stay involved in and aware of our project accomplishments by signing up for email notifications, attending our board meetings, and making comments. We look forward to this wonderful opportunity to expand our beautiful open spaces with outdoor recreation opportunities for all.

Join the Measure AA Email List>>  




La Honda Creek Open Space Preserve
On May 13, 2015, Midpen’s Board approved the use of Measure AA funds to purchase a 5-acre addition to La Honda Creek OSP. Located across the street from El Corte de Madera Creek OSP, this purchase will help Midpen fulfill its Vision Plan Portfolio #5 - Open Upper La Honda Creek Preserve by conserving open space, increasing recreational opportunities and protecting the headwaters of Harrington Creek watershed and its wildlife habitats. Download Board Reportpdf

Sierra Azul Open Space Preserve
In April 2015, Midpen closed escrow on a 40-acre inholding in the Loma Prieta section of the Sierra Azul Open Space Preserve. At an altitude of 3,200’, the property features expansive views of the Santa Clara Valley, the Diablo Range, the western Santa Cruz Mountains and Monterey Bay. On a high ridgeline between two steep canyons, the parcel is also home to a wide variety of large mammals and is territory to rare migrating birds. The purchase was made with $400,000 of Measure AA funds and contributes to Vision Plan Portfolio #25, Open the Loma Prieta Area at Sierra Azul. Download Board Reportpdf


Purisima Creek Open Space Preserve
In March 2015, Midpen purchased the 40-acre Riggs property as an addition to Purisima Creek Redwoods Open Space Preserve.  The property helps to protect the Lobitos Creek watershed which provides spawning habitat for Coho salmon and Steelhead trout, and protects scenic views from Highway 1 on the San Mateo coast. The property was purchased for $362,500, its fair market appraised value was $725,000. This purchase was made possible through Measure AA funds and contributes to Vision Plan Porfolio # 3 - Complete the Purisima-to-the Sea Trail and Protect and Restore Lobitos Creek. Download Board Reportpdf

Alpine Ranch
Once zoned for nine ranchettes, the gorgeous 353-acre Alpine Ranch in La Honda will be protected in perpetuity with $2.5 million in Measure AA funds. The property features beautiful redwood forests, two critical watersheds and connects protected open space land.

This project is included in both Portfolio #15 - Redwood Protection and Salmon Fishery Conservation in the Upper Pescadero Creek watershed, and Portfolio #14 - Future Regional Trail Connections and Campgrounds. Download Board Reportpdf


Monte Bello Open Space Preserve
The final property needed to complete the proposed Stevens Creek Trail was recently purchased in conjunction with Santa Clara County for $1.48 million. This 60-acre property along Stevens Canyon Road, which will be an addition to Monte Bello Open Space Preserve, is included in Portfolio #17 - Complete Upper Stevens Creek Trail. Download Board Reportpdf


As promised, Measure AA funds will ONLY be used for the 25 key project portfolios listed below. During the Vision Plan process these were called projects. They have been renamed portfolios, because each one contains multiple projects that will be prioritized separately.

Click the image to view the Top 25 Future Open Space Project Portfolios Interactive Story Map Project Areas

Download the Top 25 Future Open Space Project Portfolios


Midpen is already working on a number of Measure AA projects as part of the current fiscal year work plan.  These capital projects include:  public access to Mt. Umunhum at Sierra Azul and new trail connections, such as Ancient Oaks Trail in Russian Ridge Open Space Preserve and the Bay Trail gap between East Palo Alto and Menlo Park.

Members of the public are invited to submit comments with their views on project priorities.


Measure AA requires the formation of an independent oversight committee.  The Citizen Oversight Committee will consist of seven at-large members who reside within the District. The Citizen Oversight Committee is expected to meet at least once a year to review annual Measure AA expenditures and review the District’s Annual Audit and Accountability report.  Each year, the Committee’s findings will be presented to the Board at a public meeting. We encourage members of the public who are interested in learning more about the oversight committee to join the notification mailing list for the formation of this committee.


To improve access to hiking and biking opportunities, protect and preserve redwood forests, natural open spaces, the scenic beauty of our region and coastline, critical wildlife habitat, restore creeks to protect water quality, and reduce forest fire risk; shall Midpeninsula Regional Open Space District be authorized to issue up to $300 million in bonds, at a tax rate not to exceed $3.18 per $100,000 of assessed value of property owned, with expenditures verified by an independent citizen oversight committee?


San Mateo County
Santa Clara County
Portola Valley
Mountain View
East Palo Alto
Redwood City
Los Altos
Palo Alto
Half Moon Bay
San Carlos
Los Altos Hills
Menlo Park
Los Gatos
Monte Sereno

Updated 11/21/14

  Additional Information

Join the Measure AA Email List

Measure AA 5-Year Project List
(Revised March 25, 2015)

Measure AA Prioritization Criteria

Top 25 Open Space Project Portfolios
(March 20, 2014)

Measure AA Brochure

Ordinance Calling for Election

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