This spill is about 1,000 miles So/Ea of Craig MT, but according to the article a "common" issue
Link is behind a paywall, but there may be local postings by some outlet in the PNW
Iowa Fertilizer Spill Kills Nearly All Fish Across 60-Mile Stretch of Rivers
Officials in Iowa and Missouri estimated that nearly 800,000 fish had died in waters that flow into the Missouri River.
www.nytimes.com
Link is behind a paywall, but there may be local postings by some outlet in the PNW