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Oakoasis Preserve (Preserve) is an approximately 400-acre open space preserve. The Preserve is located at 12620 Wildcat Canyon Road, Lakeside an unincorporated community of San Diego County (County). The Preserve is within the upper San Diego River watershed, less than one mile east of the San Vicente Reservoir (Figures 1 and 2). The Preserve consists of areas of high value natural communities and includes a trail system, staging area and camping facilities. In addition, 17 known cultural resources have been identified within the Preserve. The Preserve is included in the County of San Diego’s Multiple Species Conservation Program (MSCP) preserve system.

ICF Jones & Stokes conducted a baseline biodiversity study of the County of San Diego?s Oakoasis Preserve (Preserve) to provide the Department of Parks and Recreation with biological data to develop a Resource Management Plan (RMP) including Area Specific Management Directives (ASMDs). To provide a baseline evaluation of biological resources, the following studies were conducted by ICF Jones & Stokes: (1) vegetation community mapping; (2) rare plant surveys; (3) pitfall trap arrays to sample amphibians, reptiles, and small mammals; (4) avian point counts; (5) nocturnal bird surveys; (6) acoustic sampling and roost surveys for bats; (7) small mammal trapping; (8) a track and sign survey for medium-to-large mammals; and (9) a camera station survey for medium-to-large mammals. This report summarizes all survey methodologies and data collected during the 2008 survey period (February through October). This report also includes recommendations for adaptive management, including management and monitoring of vegetation communities and sensitive plants and habitats, control of invasive non-native plants, and management and monitoring of sensitive wildlife species, including species covered by the South County Multiple Species Conservation Program (MSCP).