most of this river basin has been designated as an EPA superfund site.
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some of the mining waste has been removed and decontaminated.
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some contaminants have been sealed in the depths of the lake bed by sediment that has naturally eroded from the upper sections of the watershed.
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a lake management plan has been adopted that discourages any activity that might stir up the deep sediments in the lake, releasing contaminated sediments to migrate downstream
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remediation of the environment in this region has been going on for a long time, and huge costs have been incurred.
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it is unfortunate that the effort to remove the contaminants may have no end and will probably continue for many years as remediation technology becomes more effective
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