Caja del Rio (Spanish: "box of the river"; also known as the Caja, Caja del Rio Plateau, and Cerros del Rio) is a dissected plateau in New Mexico (United States), that lies between Santa Fe and the Rio Grande. In turn, the Rio Grande passes through White Rock Canyon between Caja del Rio and the Pajarito Plateau. Originally part of that plateau, the Caja was divided from it by means of headward erosion as the Rio Grande cut through the plateau and on northward into the Espanola Valley. The Caja, east of the Rio Grande, extends about 12 miles (19 km) north to south and 5 miles (8 km) east to west. Its entire rim is steep, and varies in height from about 50 feet to 800 feet, depending on the extent of erosion of the surrounding terrain. The east rim lies 10 miles (15 km) west of Santa Fe and the west rim forms a side of the scenic White Rock Canyon. Major types of vegetation on the Caja are piñon juniper forest and shortgrass meadows.
The Caja has been managed for many years by the Bureau of Land Management and the Forest Service, both of which lease grazing rights. Consequently, the Caja has numerous fence lines, gates, water tanks for use by cattle, trails, and trailhead corrals. Many of these improvements are decrepit and the meadows are severely damaged by overgrazing, with abundant cholla. From 2004, the Caja has been the focus of a grass roots campaign to develop recreational trail uses, not in place of grazing but in addition to it. It is used primarily by mountain bike and horse riders.[1]
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Geologically, the Caja del Rio shares the history of the Pajarito Plateau, specifically of the Cerros del Rio Volcanic Field.[2] Culturally, it was the subject of a Spanish Colonial land grant in 1742 which overlapped both the Cochiti Pueblo grant and a second Spanish Colonial grant.[3]
The volcanic field is monogenetic and has about 60 cinder-spatter cones and associated lava flows on the caja, formed 2.7–2.3 million years ago.[2]
The southern tip of the Cerros del Rio Volcanic Field is separated from Caja del Rio by the canyon of the Santa Fe River. South of that canyon, the volcanic field is part of a separate land grant, the Mesita de Juana Lopez Grant. Crossing that grant, Interstate I-25 drops off the volcanic field down a high escarpment known as La Bajada (descent), into the central Rio Grande valley across land belonging to Santo Domingo Pueblo. At the descent, in geological terms, the highway crosses La Bajada fault into the Santo Domingo Basin. The southern portion of the Caja del Rio, north of the Santa Fe River canyon, is also known as La Bajada Mesa.
The United States Forest Service has designated Caja del Rio a Wild Horse Territory,[4] and manages a herd of mustangs there. A separate band of feral horses in the vicinity is not managed; its members are thought to be domestic horses recently turned loose to fend for themselves.
On the north rim is a popular local rock climbing area, Caja del Rio Canyon (known locally as Diablo Canyon),[5] with an undeveloped but very large parking area at its east end. The canyon walls include impressive trap rocks. The flat, sand bottom of the canyon, although subject to spectacular flash floods during the summer monsoon season, opens into Cañada Ancha, a broad sand wash. The wash is a scenic and easy route from Diablo Canyon to the Rio Grande in White Rock Canyon. The wash is popular with horse riders.[6] From the parking area, Buckman Road (dirt) avoids Diablo Canyon by passing around the isolated butte forming its north wall, and runs parallel to the wash all the way to the river.[7] Historically, this was a major transportation route between Santa Fe and the Pajarito Plateau; at the mouth of Cañada Ancha the Rio Grande is broad and can be forded in some seasons. Here, formerly, there existed a logging town and depot of the narrow gauge Chili Line.
This canyon was a filming location for the 2007 film 3:10 to Yuma.
The proposed Rio Grande Trail, if it extends north of Bernalillo, may pass along the base of Caja del Rio.
The northern Caja has around 100 miles of mapped trails,[8] including several loop trails of sufficient length to accommodate endurance rides. One mapped trail leads from the rim down to the Rio Grande. Other trails exist but are not mapped, primarily because their condition makes them unsafe for average trail users.
  | LosAlamos.com: Diablo Canyon - Diablo Rock Climbing Home Page |
| | fs.fed.us: Caja del Rio Wild Horse Territory - Caja del Rio Wild Horse Territory |
| | cajadelrio.com: Caja del Rio Landfill - SFSWMA - Santa Fe Solid Waste Management Agency |
| | download - USGS Miscellaneous Field Studies Map MF-2352: Geologic Map of the Tetilla Peak Quadrangle, Santa Fe and Sandoval Counties, New Mexico |
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