Tuesday, March 24, 2026

AIs version of what happened in the Metam Sodium Spill of 1991 in the Mt. Shasta-Dunsmuir area of California

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On July 14, 1991, a Southern Pacific train derailed at the
Cantara Loop near Mt. Shasta, CA, spilling ~19,000 gallons of the soil fumigant metam sodium (not sodium bromide) into the Sacramento River. The toxic chemical created a 41-mile plume, killing all aquatic life to Lake Shasta and poisoning residents in Dunsmuir.
Key Aspects of the 1991 Cantara Loop Spill:
  • The Chemical: Metam sodium (specifically a soil fumigant/herbicide) was released, which released toxic methylisothiocyanate (MITC) gas upon contact with water, note USGS (.gov) and PubMed.
  • Environmental Impact: The spill caused one of California's worst environmental disasters, killing all fish, insects, and vegetation along a 40-to-45-mile stretch of the river, say Dunsmuir Parks and EBSCO.
  • Human Health & Safety: Hundreds of residents in Dunsmuir and surrounding areas suffered symptoms including nausea, headaches, and eye irritation from the noxious fumes.
  • Aftermath: The river's ecosystem took several years to recover, with significant cleanup and restoration efforts following the $38 million settlement paid by Southern Pacific, note Active NorCal.
The site of the disaster, the Cantara Loop, is a series of sharp, dangerous curves, which were believed to cause the train's tanker car to derail.
  • Southern Pacific Railroad Metam Sodium Spill
    The Southern Pacific Railroad derailed on July 14, 1991, spilling 19,000 gallons of metam sodium into the Sacramento River. Metam ...
    USGS (.gov)
  • From our archives: Cantara Loop spill was 29 years ago
    Jul 15, 2020 — The spill also sickened hundreds of people in the Dunsmuir and Sweetbriar area. Symptoms included: * Burning eyes * Headaches * Na...
    Mount Shasta Herald
  • Self-Guided Tour Sign #14 -- Cantara Spill - Dunsmuir Recreation & Parks District
    The spill killed all aquatic life in the river for 40 miles, all the way to Lake Shasta. The river recovered after ten years, but ...
    Dunsmuir Parks
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