Interesting recent studies related to similar events of the past now longer duration and more potential of increased hazards for fish, etc...
"Poulin, whose expertise is in water chemistry, thought the staining looked similar to what happens with acid mine drainage, except no mines are near any of the impaired rivers, including along the famed Salmon River and other federally protected waters."
"While O'Donnell first noticed a change in 2018, satellite images have turned up stained waters dating back to 2008.
"The issue is slowly propagating from small headwaters into bigger rivers over time," he said. "When emergent issues or threats come about, we need to be able to understand them."
Alaska's rusting waters: Pristine rivers and streams turning orange
Dozens of Alaska's most remote streams and rivers are turning from a crystal clear blue into a cloudy orange, and the staining could be the result of minerals exposed by thawing permafrost, finds new research in Communications Earth & Environment.
phys.org