The Keithley Preserve is one of the jewels of The Escondido Creek Conservancy’s 3,100-acre system of protected nature preserves in the Escondido Creek watershed in North County. Approaching 1,000 acres in size, the Keithley Preserve is adjacent to the 800-acre Elfin Forest Recreational Reserve and they together, along with adjacent County of San Diego owned lands, support a variety of rich habitats for wildlife including mountain lions, deer, birds and acquatic species.