Open Space District, Santa Clara County Take Steps to Protect Scenic Ridgeline

The Santa Clara County Board of Supervisors voted 5-0 to this week to protect the hillside and surrounding habitat bordering Lehigh Cement Plant & Quarry by taking the first step to grant shared enforcement rights associated with a 1972 preservation easement to the Midpeninsula Regional Open Space District (Midpen). County Supervisors Joe Simitian (District Five) and Otto Lee (District Three) championed the proposal.

The proposal from Simitian and Lee had strong support from the Bay Area environmental community including Midpen, Green Foothills, Sierra Club, and half a dozen other environmental advocacy organizations: Mothers Out Front, Audubon Society, Muwekma Ohlone, Greenbelt Alliance, Clean Creeks Coalition, Santa Clara Valley Native Plant Society, Grassroots Ecology, and Bay Area for a Clean Environment.

The Midpen Board of Directors formally agreed to pursue the grant of easement authority on Wednesday, June 23. The two entities will collaborate on drafting the legal mechanism for the grant and report back to the Board of Supervisors August 17.

“For five decades this easement has protected our hillside views and habitat. Now there’s a proposal by Lehigh Southwest Cement to essentially ‘chop the top’ off the ridgeline,” said Simitian. “Violating the easement is something we can’t let happen. Having an enforcement partner with a strong commitment to open space protection will help ensure it doesn’t.”

According to the county Planning Department, Lehigh’s proposal would remove approximately 100 vertical feet (297 to 514 linear feet from top to bottom), across a width of almost 4,000 feet, which would result in a loss of over 20 acres of hillside.

“There can be no doubt as to the importance of protecting our hillsides. The public clearly values them both for the viewshed they provide (as both an economic and aesthetic matter), and their inherent habitat value,” continued Simitian in a statement. “By partnering with Midpen, we strengthen the county’s effort to protect the hillside, more efficiently use public resources, and preserve a significant public asset.”

In bringing the proposal forward, Lee observed that the quarry currently sits less than a quarter mile from two popular hiking spots, Rancho San Antonio and Stevens Creek County Park.

“Protecting public lands can be a challenge when multiple agencies are involved, and I want to make sure we highlight the collaborative effort across the community. We are stronger when we work together, especially when we have this opportunity to save our environment, right here locally,” said Lee.

“We have suffered enough dust, air and water pollution caused by the mining operations at this quarry. Additionally, with a climate crisis on our hands, we must do everything we can to protect our green and open spaces,” said Lee.

County staff will begin working on a legal agreement with Midpen, whose District boundaries include the quarry, to protect and enforce the ridgeline and hillsides. Midpen has a mission and focus, of preserving, protecting, and restoring open spaces to protect the natural environment and for public enjoyment and education, and the county has a long history of successfully collaborating with Midpen when it comes to open space protection.

“Midpen, established in 1972 by a vote of the people, is uniquely suited to partner with the County to protect this ridgeline easement,” said Yoriko Kishimoto, Board Director, Midpen (Ward 2) and Chair of Midpen’s Lehigh Quarry Ad Hoc Committee.

“Nearly 800,000 people per year visit Rancho to enjoy the benefits of nature that are so essential to our well-being,” said Kishimoto. “Not only does the ridgeline protect the viewshed and critical wildlife habitat, it’s also vital to protect the preserve and the surrounding communities from the impacts of the operations, reducing the spread of dust, blocking the noise, and protecting the preserve from potential landslides.
At a June 17 event announcing the proposal, support for the effort to bolster hillside and open space protection was echoed by James Eggers, Director of the Sierra Club’s Loma Prieta Chapter; Brian Schmidt, Legislative Advocacy Director, Green Foothills; and local mayors Darcy Paul (Cupertino) and Neysa Fligor (Los Altos).  The cities of Cupertino and Los Altos and the Town of Los Altos Hills have also expressed support for the proposal.

Local labor leaders, including Jim Riley, District Representative for Operating Engineers Local 3 and Eddie Venancio, Business Representative for Teamsters Local 853, joined the discussion last week to share their support of the proposal. “We are friends of the environment.  We all love to go hiking and love the beauty of the mountain. We would love to see the reclamation process take place and use our labor to put the mountain back to the way it was so people can enjoy it that way it’s meant to be,” said Venancio.

“I’m confident the county and Midpen can reach an agreement around sharing enforcement rights,” concluded Simitian. “And I look forward to a long partnership with Midpen and our other conservation partners, including labor in this instance, to deliver a good outcome; in this case, an intact ridgeline that best serves our community.”



  1. With any luck, now there will be a cement shortage that will prevent the building of more “affordable housing “.

  2. Even though California cement consumption increased in 2020, the cement kiln above Los Altos hasn’t operated since early 2020, well over a year, and the Bay Area economy has not imploded. In March of 2021, the CEO of Lehigh’s parent company, HeidelbergCement of Germany, announced that since the “mothballing” of the plant, company financial results improved quite significantly. There are 7 other cement plants in California along with multiple port terminals. The limestone here is particularly problematic in that it has many contaminants that pollute our air after being heated in the kiln (using pet coke as a fuel) and pollute our water. That limestone should never have been pulled out of the ground, we know better now. Consider also that even two unions have bailed on Lehigh.

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