Places We Protect

San Andreas Linkage

California

A herd of pronghorn antelope cross a grassland with purple flowers.
Las Piletas TNC purchased Las Piletas Ranch in eastern San Luis Obispo County—13,528 acres of rolling foothills, grasslands and oak woodlands, along with 24 miles of streams. © Ethan Inlander/TNC

Our goal is to create a wildlife linkage that spans nearly 600,000 acres along the San Andreas Fault.

Overview

Description

California’s Inner Coast Range contains what many consider to be the state’s most valuable unprotected wildlife linkage. The range runs along the San Andreas Fault, where tectonic activity created the conditions for amazing biodiversity, from plants found nowhere else on Earth to iconic species like pronghorn and tule elk. Though most people know the name San Andreas because of the fault line, the surrounding region has the potential to make a difference above ground with the establishment of the San Andreas Linkage.

Our goal is to create a series of wildlife corridors that span nearly 600,000 acres—a refuge on the scale required to sustain the full suite of the region’s native species in the face of climate change. We are connecting multiple protected areas, many of which were previously isolated: the Carrizo Plain National Monument, Carrizo Plains Ecological Reserve, Los Padres National Forest, Bureau of Land Management rangelands, and protected private and U.S. Forest Service lands.

This reconnected habitat will support a climate-resilient wildlife linkage and provide water resources for native species. It will also prevent further energy development from disrupting and fragmenting ecosystems.

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Explore our work in California

Purple flowers in a field with a stream in the background.
Las Piletas Ranch By protecting Las Piletas Ranch, we are creating a climate-resilient wildlife linkage and creating a stronghold for sensitive species. © Ethan Inlander/TNC
A mama fox stands in golden grasses and protects her two pups that are near her.
LAS PILETAS RANCH The endangered San Joaquin kit fox is native to the inner Coast Ranges region where the Las Piletas Ranch is located. © Ethan Inlander/TNC
Las Piletas Ranch By protecting Las Piletas Ranch, we are creating a climate-resilient wildlife linkage and creating a stronghold for sensitive species. © Ethan Inlander/TNC
LAS PILETAS RANCH The endangered San Joaquin kit fox is native to the inner Coast Ranges region where the Las Piletas Ranch is located. © Ethan Inlander/TNC

Las Piletas Ranch

Purchased by TNC in 2022, Las Piletas Ranch boasts 13,500 acres of rolling foothills, grasslands and oak woodlands along with 24 miles of springs and seasonal creeks. The land is located in California’s Inner Coast Range, and protecting it has implications far beyond the boundaries of the property. Las Piletas Ranch represents a critical piece in a network of habitat that we are working to connect across the entire region.

By protecting Las Piletas Ranch, we are creating a climate-resilient wildlife linkage and creating a stronghold for sensitive species, including the California condor, pronghorn antelope and San Joaquin kit fox. This acquisition builds on more than 30 years of TNC’s work in the region.

Now, to achieve our vision for the San Andreas Linkage, we’re focused on securing locations that expand on existing protected areas and connect them to other adjacent conserved lands, ultimately targeting hundreds of thousands of acres of protection across 31 properties.

Carrizo Plain National Monument

The Carrizo Plain stretches for 250,000 acres along the base of the Temblor Mountains, 60 miles east of San Luis Obispo. Its vast grasslands, as well as woodland habitats and vernal pools, sustain 15 threatened and endangered plants and animals.

Here may rest the future of such species as the California jewelflower, San Joaquin kit fox, mountain plover, blunt-nosed leopard lizard, pronghorn antelope and giant kangaroo rat.

The Carrizo Plain is also the largest protected habitat along the Pacific Flyway, making it a birder’s paradise in winter. In spring, Carrizo’s rolling grasslands thrill wildflower enthusiasts with a breathtaking assortment of blooms.

THINKING BIG

In 1988, The Nature Conservancy partnered with the U.S. Bureau of Land Management and the California Department of Fish and Wildlife to undertake an ambitious project of acquiring and managing this great expanse of land.

Through cooperative effort, the initial 82,000-acre parcel not only grew to its current quarter-million acreage, it garnered federal support, becoming a national monument in 2001.

LANDMARK RESOURCE MANAGEMENT PLAN AND CONSERVATION STRATEGIES

The partners worked tirelessly to develop a stewardship plan for this vast area. The resulting resource management strategy uses an innovative set of protocols to maintain and increase the populations of threatened and endangered species.

The Carrizo Plain project also represents a prime platform for scientific research. Together with our partners we have implemented cutting-edge conservation approaches, such as the use of satellite technology to track the vitally important giant kangaroo rat, a keystone species without which the ecosystem would collapse.

Giant Kangaroo Rat | Notes from the Field (8:23) This month, Scientist Scott Butterfield introduces us to the amazing endangered species of Central California's Carrizo Plain, a protected landscape the size of Los Angeles. Join him as he monitors the health of the endangered giant kangaroo rat, the plain's grapefruit-sized ecosystem engineer!
Blunt-Nosed Leopard Lizard (5:33) This month, Senior Scientist Scott Butterfield is introducing us to the amazing endangered species of Central California's Carrizo Plain, in a special two-part series. This week, he's back on the plain tracking the elusive blunt nosed leopard lizard using radio monitoring.