colorado river

National Park Service

Scientists have made the first-ever map of how tamarisk beetles have spread into the Grand Canyon from other states. The leaf-eating beetles were introduced to control the invasive trees. But as KNAU’s Melissa Sevigny reports, they weren’t supposed to survive as far south as Arizona.

AP Photo/Julie Jacobson, File

Tension over the drought-stressed Colorado River escalated into a public feud when four U.S. states accused Arizona's largest water provider of manipulating supply and demand, potentially threatening millions of people in the United States and Mexico who rely on the river.

One of the driest winters on record is leading to one of the lowest runoffs for Arizona’s watersheds. KNAU’s Justin Regan reports.


Doug Nering

Navigating the rapids of the Colorado River through the Grand Canyon is a big responsibility, especially when you’ve got a boat full of passengers … especially when those passengers are visually impaired. In this month’s Canyon Commentary, Scott Thybony recalls one of his final trips as a river guide. It was one of the most epic and memorable runs he ever made.


George Andrejko, AZGFD

The U.S. Fish and Wildlife Service says a fish native to the Colorado River is no longer in immediate danger of extinction. KNAU’s Melissa Sevigny reports the humpback chub will be reclassified as “threatened” instead of “endangered.”


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