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The San Pedro River is a northward-flowing stream originating about 10 miles (16 km) south of the international border south of Sierra Vista, Arizona, in Cananea Municipality, Sonora, Mexico. The river starts at the confluence of other streams (Las Nutrias and El Sauz) just east of Sauceda, Cananea. [ 3 ]
The San Pedro Valley starts 10 miles (16 km) south of the United States–Mexico border and extends 140 miles (230 km) north through Arizona. The San Pedro River flows from the state of Sonora, Mexico, through Cochise, Pima, Graham, and Pinal Counties to Winkelman, Arizona.
The San Pedro House is located along the river to the east of Sierra Vista and is a fully restored historic ranch house dating to the 1930s. It is now used as a visitor center and bookstore for the San Pedro Riparian NCA. [2] [4] In April 2022, the San Pedro River was named as one of America's Most Endangered Rivers. [3]
Beavers help keep a riparian ecosystem functioning, but on the San Pedro River, the species has struggled to maintain steady populations.
The San Pedro River Preserve is a Nature Conservancy preserve in Dudleyville, Arizona. The Preserve comprises 820 acres (3.3 km 2) of deeded land along the San Pedro River acquired for the protection of southwestern willow flycatcher (Empidonax traillii extimus) habitat. There are two miles of cottonwood/willow riparian.
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The Lehner Mammoth-Kill Site is in southern Arizona (Cochise County) on the west bank of the San Pedro River 1.5 miles southwest of the town of Hereford. It is significant for its association with evidence that mammoths were killed here by Paleo-Indians 11,000 to 12,000 years before present.
The discovery of water at Tombstone allowed the erection of mill sites there rendering the San Pedro River mill sites superfluous; when the Contention Mine and the silver mines in Tombstone flooded in 1886 and 1887, after the 1887 Sonora earthquake, the mills were forced to shut down, and Contention City suffered a fatal blow. The population ...