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Mount Umunhum Projects
(updated: 5/8/13)Update: Mount Umunhum Environmental Restoration and Public Access ProjectThe demolition contractor was issued a Notice to Proceed in November 2012. However, because live power must be removed prior to demolition activities, the demolition project work has been delayed. PG&E expects to remove live power by May 17, 2013. The demolition contractor anticipates beginning on-site demolition work between mid-August and mid-September.
Great news! On Feburary 14, 2013, the District received a $1M grant from the California Coastal Conservancy. The grant will support project implementation and fund construction of a staging area near Bald Mountain, a trail to the summit (anticipated to connect with the Bay Area Ridge Trail), and visitor amenities at the summit
including an ADA trail, seating at viewpoints, and interpretation of the site's rich natural and cultural history. Please see the press release For questions or comments regarding the Mount Umunhum Environmental Restoration and Public Access Project, please contact Meredith Manning, Acting Planning Manager, at 650-691-1200. To receive project updates via email, please subscribe here. Previous MeetingsOctober 17, 2012: Board Approves Interim Action A for the Mount Umunhum Environmental Restoration and Public Access ProjectAbout 120 people attended the public meeting at the Historic Del Monte Building in Sunnyvale on October 17, where the Board voted unanimously to keep the Mount Umunhum radar tower for five years to allow time for supporters and proponents of retaining the radar tower to develop partnerships needed for long-term preservation. The approval of "Interim Action A: Near-term repair and securing of structure while considering external partnerships" came after considering a number of factors, including existing policy, public input, the tower's impact on the recreational and educational opportunities at the site, and the potential for long-term partnerships to help fund the retention of the tower.
This near-term solution would provide interim "Life Safety" repairs necessary to allow public access to the exterior base of the tower during this time period. Access to the interior of the structure would only be allowed to District employees, potential funding partners, and repair contractors. The near-term repairs needed for Interim Action A are estimated to cost $414,855 and would include the following:
In other Board actions, the following project elements were approved on a phased, conceptual basis:
Providing public access to the summit as early as possible is a primary goal of the project. The first phase, which includes access to the summit via a new, multi-use trail (hiking, biking, and equestrian) from a new parking area near Bald Mountain, is expected to open to the public in 2016.
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| Oct17 2017 | Deadline for proponents of the tower to establish and develop partnerships, funding, and other resources to allow for implementation of Option 3, Retain and Seal (per Interim Action A). | |
| Aug - Sep 2013 | Demolition of all structures at the former Almaden Air Force Station except the radar tower. | |
| May 2013 | PG&E to remove live power from the site prior to start of demolition work. | |
| Feb 2013 | Demolition contractor expected to begin site clearing, setup, and tree removal. | |
| Nov 2012 | Demolition contractor issued the Notice to Proceed. | |
Oct17 2012* |
Public Hearing where the Board of Directors selected Interim Action A: Near-term repair and securing of structure while considering external partnerships. This action defers the radar tower options for up to five years, giving the community interested in preserving the radar tower the opportunity to seek partnerships and develop viable preservation options before the Board makes the final decision on a radar tower option. | |
| Sep19 2012* | Public Hearing where the Board of Directors reviewed public input received regarding the Mount Umunhum Environmental Restoration and Public Access Project and approved:
The Board also unanimously voted to consider a backpack camp as part of a larger, more regional effort to provide public access within the greater Sierra Azul + Bear Creek Redwoods Master Plan process, which is anticipated to resume next year. No decision on the radar tower was made at this time. |
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Jul18 2012* |
Community open house and board workshop where information was presented on design opportunities and constraints, short- and long-term maintenance, and costs for all three radar tower design options. | |
Jun12 2012* |
Public Hearing where the Board of Directors certified the FEIR and approved demolition of all structures except the radar tower. No decision on the radar tower was made at this time. | |
May25 2012* |
Release of Final Environmental Impact Report (FEIR) for public review. Copies will be available at the Los Gatos Public Library, the Almaden Branch Library, the District's Administrative Office, and online. | |
Feb10 2012* |
Comment period deadline for the public environmental review process of the Draft Environmental Impact Report (DEIR) under California Environmental Quality Act (CEQA). | |
Jan18 2012* |
Public Hearing to provide comment on the environmental analysis. | |
Dec12 2011* |
Release of Environmental Documents for Public and Board of Directors Review. | |
Dec9 2010* |
Public Hearing to Consider Recommendation for Public Access and CEQA Scoping Meeting. | |
Nov18 2010* |
Public Open House to Present Recommended Vision for Public Access. | |
Nov17 2010 |
Informational Update to the Board of Directors. | |
Oct 2010 |
Development of Vision for Public Access. | |
Sep 2010* |
First Public Workshop to Present Project Themes. | |
Aug 2010 |
Development of Project Themes. | |
May - Jul 2010* |
Background Project Research + Stakeholder Meetings. | |
Closures in Sierra Azul Open Space Preserve Announced (7/22/2011)
Since the hazardous material abatement of the former Almaden Air Force station atop Mount Umunhum in Sierra Azul Open Space Preserve, the District has seen an increased number of trespassers.
Effective July 22, 2011:
In order to protect public safety and guarantee security, some portions of Sierra Azul's Mount Umunhum area are closed until the site is fully remediated and secure public access can be established.
Please note that the Mount Umunhum and Mount Thayer areas, where remediation work is ongoing, are designated Hazardous Closed Areas. That means anyone who trespasses into the area will be cited for a misdemeanor.
Areas that are adjacent to Mount Umunhum and Mount Thayer are declared Temporary Closed Areas. Trespassers will be cited for an infraction.
Please refer to the attached map
for details.
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On July 20, 2011, KQED QUEST aired a television piece entitled Mount Umunhum: Return to the Summit.
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Mount Umunhum Remediation Project Photo Gallery
On July 8, 2011, the Army Corps' contractor completed the hazardous materials remediation work on site. The contractor completed miscellaneous cleanup and security work for the remainder of July.
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Draft Mount Umunhum Environmental Restoration and Public Access Plan

The goal of the proposed Project Plan is to establish a fiscally sustainable visitor destination that balances public access, enjoyment, and education with environmental restoration. This goal aligns with two directives of the District's Mission: to protect and restore the natural environment, and to provide opportunities for ecologically sensitive public enjoyment and education. This goal will be achieved through the following objectives:
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The former Almaden Air Force Station at Mount Umunhum, located near Los Gatos,
was acquired by the District and added to the Sierra Azul Open Space Preserve
in 1986. This high peak, with views as far as Monterey Bay, is special to the
military personnel and their families who were stationed there. Mount Umunhum is
also important to the Ohlone people as part of their creation belief. Current Santa
Clara Valley residents know Mount Umunhum as the intriguing location of the huge,
cement radar tower visible for miles. Federal funding will allow the District to begin
cleaning up the site so that planning for
restoration and public access to this
spectacular local landmark can start.
For more information, please contact mt.um@openspace.org or call the Administrative Office at 650-691-1200.
The District acquired Mount Umunhum, the second-highest peak in the Santa Cruz Mountains, in 1986 when it purchased the 44-acre former Almaden Air Force Station and surrounding lands from the United States Government. Prior to transferring the property to the District, the Department of Defense acknowledged that the site, which had been intensely developed with nearly 90 structures, underground conduit tunnels, and interconnecting pipelines, was contaminated due to past defense activities. While the extent of contamination was unknown, the Department of Defense assured the District that the federal government would decontaminate the site. Unfortunately, over the next 20 years, the Army Corps of Engineers conducted only limited cleanup.
In 2010, for the first time, Congress appropriated $3.2 million in funding for the cleanup of Mount Umunhum. While this is a significant step forward, total costs for site cleanup and site work for public access are estimated to be $11 million.
With its scenic views, Mount Umunhum offers tremendous potential for environmental education and public recreation. As with other open space lands, the District wishes to:
Press Release![]()
February 20, 2013
Press Release![]()
October 19, 2012
Press Release![]()
October 15, 2012
Board Meeting Agenda + Report![]()
October 2012
Press Release![]()
October 10, 2012
Press Release![]()
September 20, 2012
Board Meeting Agenda + Report![]()
September 2012
Press Release![]()
September 17, 2012
Press Release![]()
July 20, 2012
Letter of Support from Congressman Honda![]()
July 18, 2012
July 18 Meeting Flyer![]()
Board Meeting Agenda + Report![]()
July 2012
Press Release![]()
July 16, 2012
Board Meeting Agenda + Report![]()
June 2012
Final Environmental Impact Report![]()
May 2012
Draft Environmental Impact Report || Appendices (separate)![]()
December 2011
Notice of Preparation![]()
December 2010
Site Overview![]()
Concept Plan![]()
December 2010
Board Report![]()
December 2010
Vision for Public Access: Oblique View![]()
November 2010
District Preserves & Surrounding Lands![]()
Sierra Azul OSP![]()
Nearby Natural Resources![]()
Viewshed: Mount Umunhum and Mount Thayer![]()
September 2010
Sierra Azul Open Space Preserve
Sierra Azul + Bear Creek Master Plan