This Important Bird Area, adjacent to the Jepson Prairie Preserve, lies about 15 miles east of Fairfield, centered on the intersection of Highways 12 and 113. It features a cluster of dry agricultural fields and pastureland at the edge of the Delta ecosystem.
These grasslands have emerged as a key site within the Bay Area and Delta for several declining grassland species, notably an exceptional diversity of wintering raptors and for breeding Swainson's and Northern Harrier. Burrowing Owl and Loggerhead Shrike, both widely extirpated in the region, are resident, and one of two wintering flocks of Mountain Plover in northern California favors the fields along Robinson Rd., and is not found in the vernal pool habitat on nearby Jepson Prairie Preserve.
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The habitat in this area has received no protection from wildlife agencies and conservation groups, and it is likely that it will be eliminated soon unless conservation easements can be put in place to maintain current agricultural uses (Robin Leong, via email). The area is steadily seeing more vineyards and is quickly urbanizing; a golf/retiree community has been constructed at nearby Rio Vista, and a large windfarm was recently installed at Bird's Landing. Windfarms approaching northward towards Highway 12 are a growing threat.
The area is currently unprotected and recently, vineyards and golfcourses have been constructed.
This IBA features a cluster of dry agricultural fields and pastureland at the edge of the Delta ecosystem.