Bristol Bay
The Bristol Bay watershed in southwest Alaska supports the largest sockeye salmon fishery in the world, is home to 25 federally recognized Tribal governments, and contains large mineral resources. Learn more about Bristol Bay, its indigenous cultures and its ecological resources.
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EPA's Final Determination
EPA's Final Determination limits the disposal of dredged and fill material associated with developing the Pebble deposit in certain waters that are important to sustaining the region’s salmon resources.
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Timeline of EPA actions
A timeline of EPA's Clean Water Act section 404(c) review of potential impacts of large-scale mining development in the Bristol Bay watershed.
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EPA's Bristol Bay Assessment
In January 2014, EPA released its final assessment: The Effects of Large Scale Mining on the Salmon Ecosystems of the Nushagak and Kvichak Rivers.