FLAGSTAFF, Ariz. - An endangered fish found in the Colorado River basin is on the upswing, federal officials said Tuesday as they proposed reclassifying the humpback chub as threatened.

After returning to the lower Colorado River in 2012 after a 22-year absence, the endangered razorback sucker fish is now spawning in Grand Canyon National Park, scientists announced today (June 18).

GRAND JUNCTION, Colo. (KJCT) - The Colorado River has new fish swimming in its waters. A group of Palisade High School students, part of the Endangered Fish Hatchery, released razorback sucker ...