The San Pedro River basin has been called ... habitat along nearly 59 miles of the river from the “narrows” north of Cascabel, to the confluence with the Gila River at Hayden.

More than 100 “citizen scientist” volunteers, using GPS technology and cameras, plan to fan out along the 170-mile-long San ... in Mexico to its confluence with the Gila River near Winkelman.

The San Pedro River stretches from Sonora, Mexico, to Winkelman, where it empties into the Gila River. Water flowed on the surface year-round until a couple of decades ago. Today, only 30 of the ...

The San Pedro River, stretching from Sonora, Mexico, all the way north to the Gila River near Winkelman, is a critical “rest stop.” It is a flyway for half of all the bird diversity in North ...

Someone's been scraping away with hand tools on a terrace above the San Pedro River ... stretch from north of Benson to its confluence with the Gila River near Winkelman, finding a village ...

The San Pedro River winds from rainforests in Guatemala through the Yucatan Peninsula in eastern Mexico. There, this peaceful river widens into a series of slow-flowing lakes. Along a remote 50 ...

Confluence Park, which is expected to open by 2017, will be developed at the river’s intersection with San Pedro Creek. The donor is BHP Billiton, which is among the world’s largest producers ...