The warning updates previous advisories issued in the wake of the 2023 train derailment near Reed Point that resulted in an estimated 419,400 pounds of asphalt spilled into the water.

The accident was the second large oil spill into Montana’s Yellowstone River in less than four years, raising questions about oversight of the nation’s aging pipeline network. The Poplar ...

He had graduated from Gardiner High School and was poised to leave for undergraduate study at University of Montana Western when a widespread fish kill occurred on the Yellowstone River.

In a years-long fight to stop a power plant near Laurel from releasing the pollution equivalent of 167,000 cars per year, the Montana Supreme Court decided unanimously that both the ...