The Colorado River from Glenwood Springs to the Utah border is now considered positive for zebra mussels, an invasive species known to devastate ecosystems and clog critical infrastructure.

The 1,450-mile Colorado River provides drinking water and agricultural irrigation to about 40 million people across seven U.S. states, 30 tribal nations and two states in Mexico.

Driven in part by the ongoing western megadrought, the foundation governing how Colorado River water is shared may be cracking, threatening drinking water supplies for millions from Denver to Los ...