Arizona’s San Pedro River Runs Dry for the Second Time in 122 Years

For the second time in 122 years, a sensitive gauge measuring the San Pedro River’s streamflow near Sierra Vista went dry, a reading conservationists say is bad news for one of the Southwest’s last free-flowing rivers.

On June 22, the river stopped flowing at a U.S. Geological Survey stream gauge east of the city. That site, known as the Charleston gauge, monitors the river’s water level at the surface and remained at zero for over two weeks.