Buenos Aires National Wildlife Refuge in southern Arizona was established in 1985 for the reintroduction of masked bobwhite quail and the restoration of natural landscapes and their native wildlife, including the Sonoran Pronghorn. The 118,000-acre refuge lies in a broad Altar Valley between the Baboquivari Mountains, with their prominent main peak in the west, and the lower San Luis Mountains to the east. In the 1850s, Pedro Aguirre, Jr. built a homestead here in 1864 and named it Buenos Ayres, or "good air," because of the constant winds. His ranch changed hands several times before being purchased to form today's wildlife refuge. The refuge's visitor center is located in the adobe ranch house.
The refuge has over 80 designated campsites identified by a numbered sign. Camping is free and allowed for 14 days in a 30-day period, but only in the designated campsites. Most campsites have a fire ring/grill. Site sizes vary from a single vehicle to large enough for multiple RVs and trailers. Most are suitable for tents.
Fuel and limited supplies are available in the nearby small towns of Sasabe and Arivaca.
Castle Rock Tank begins in the refuge as 202 and enters the Coronado National Forest, changing road numbers to 4115. The trail is well maintained, with a few wash crossings and ruts. It ends at a lollipop turnaround. There are fantastic views along the trail and a dense grove of ocotillo cacti. A spur to the east leads to the mouth of an interesting canyon. There are no campsites inside the refuge, but several large sites sit roadside in the national forest portion. The sites can accommodate multiple vehicles and have rock fire rings.
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