Conservation Significance of Rancho Guejito

Executive Summary

October 2005

In 1974, the California Department of Parks and Recreation studied the feasibility of acquiring Rancho Guejito in San Diego County and developing it into a unit of the State Park system. The conclusion of that study was that Rancho Guejito should be acquired, as it would preserve highly significant biotic, geologic, cultural, and scenic values as well as the only remaining intact Mexican land grant in Southern California. Furthermore, conservation would offer the residents of Southern California a living ranch interpretive experience and outdoor recreation opportunities in the mid-elevation ecosystems of the Peninsular Ranges in Southern California, which are inadequately represented in public parks and reserves (California State Parks 1974).

Unfortunately, the acquisition did not happen at that time, but the gate to an unexplored landscape was opened for a glimpse of the natural and cultural resources that have remained sequestered undisturbed for thousands of years. Since that time, the story of Rancho Guejito has grown to legendary status among biologists and archaeologists in Southern California, as the conservation jewel of San Diego County.

In the early 1990s, the gate to Rancho Guejito was opened again, for biological and archaeological investigations related to a proposed emergency storage water reservoir in Guejito Valley. However, these investigations determined that the resources on the site were far too significant to justify the project.

Now, a generation after the initial State Parks study, the legend of Rancho Guejito has been resurrected, but this time under the threat of residential development.

This document provides an introduction to the intersecting cultural and biological conservation values of Rancho Guejito—its cultural history, rare biological resources, its ecological functions within surrounding conserved areas, its significance to past, present, and future generations of Californians—and a plea for conservation of the irreplaceable values it supports, the loss of which cannot be mitigated elsewhere:

• Rancho Guejito represents a geographical and cultural bridge between the coastal and mountain settlement patterns of Indians. The oaks and grasslands represented on the hills and valleys of Rancho Guejito provided sufficient resources to support large populations of different Indian groups.
• The cultural legacy of Rancho Guejito, and the natural resources that are intertwined in this legacy, are preserved to a remarkable degree, undisturbed in their original natural setting and context, providing significant research and interpretive opportunities, as well as a captivating story of our past.
• Rancho Guejito is the last remaining intact Mexican land grant and retains a historical landscape representing the earliest ranching in Southern California. The historic features and sites remain relatively untouched and still within their original setting, providing a once-in-a-lifetime opportunity for research, education, and interpretation.
• Nestled in the foothills of the Peninsular Ranges, Rancho Guejito is an ecological gateway to the high elevation habitats of the Cleveland National Forest—representing both a linkage to lower elevation coastal habitats and a landscape critical to supporting ecosystem functions and wilderness values of existing conservation investments.
• Rancho Guejito is part of a large ecological core area, whose integrity is essential to maintaining ecological processes that vegetation and wildlife communities depend on, such as natural hydrological and fire regimes, which require large landscapes to function.
• High integrity watersheds on Rancho Guejito support intact hydrologic processes and high water quality, which are crucial to the long-term viability of existing conservation investments in the San Pasqual Valley. Guejito Creek on the property supports designated Critical Habitat for a population of the endangered arroyo toad.
• Ranch Guejito supports a diverse assemblage of over 20 vegetation communities, including many communities not well protected in the ecoregion, such as oak savannas, grasslands, alkali meadows, and vernal pools, and some of the largest individual trees and largest stands of Engelmann oak woodlands in San Diego County.
• The large expanse of rolling grasslands on Rancho Guejito supports at least 16 different raptor species and one of the largest remaining populations of the endangered Stephens’ kangaroo rat. Rancho Guejito could play a critical role in the persistence and recovery of this imperiled species, because its population represents a unique genetic legacy.
• In its location at the urban-wildland interface, Rancho Guejito provides unique aesthetic, recreational, educational, and spiritual opportunities for millions of people living in Southern California and represents an opportunity to protect quality of life in the face of rapid land use changes. These values have already been lost in much of Southern California and western San Diego County and can never be restored.

Enormous federal, state, and local investments have been made in the acquisition and conservation of natural lands, as witnessed by our National Forests, State Parks, National Wildlife Refuges, and Natural Community Conservation Planning (NCCP) programs like the Multiple Species Conservation Program (MSCP) in San Diego County. Indeed, the unique quality of life of Southern Californians relies on the recreational, educational, aesthetic, and spiritual values of these natural lands. But the viability of these lands and our quality of life will be jeopardized if the lands are not linked within a network of conserved landscapes and managed in a way that protects their resources and maintains their integrity.

Conservation and interpretation of both the natural and cultural environments, in an intact, natural setting, will enable a new synthesis of science-based habitat management and traditional ecological knowledge that is critical to maintaining our existing and growing network of conserved lands. Conservation of the natural and cultural resources at Rancho Guejito, in an intact, natural setting—between the coastal mesas of the NCCP reserves and the foothills and mountains of the National Forest lands—will allow us to begin realizing this vision.

For more information, please contact Jerre Stallcup.