MESA COUNTY, Colo. — A train derailment on Tuesday evening spilled thousands of gallons of diesel into the Gunnison River , and Denver7 is learning more about possible impacts to the river's wildlife, which includes one of North America's most endangered fish species sitting on the brink of extinction.

The derailment happened at 10:53 p.m. Tuesday near Whitewater, according to the Colorado Public Utilities Commission (PUC). Two crew members were treated at a hospital and released.

Rockfall on the rail corridor was the likely cause of the crash, PUC's Office of Rail Safety said Wednesday.

Heavy equipment was used to extract the train cars in the water and complete hazmat cleanup. The PUC added that Colorado Parks and Wildlife (CPW) biologists were analyzing impacts to fish. Diesel typi

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