DEQ proposes Big Hole River as ‘impaired’

By: Jordan Hansen

Outlets: Daily Montanan

Published: June 26, 2026

Words: 732

Last Updated: 3 weeks, 5 days ago

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The Montana Department of Environmental Quality has determined the Big Hole River is impaired, which follows significant legal pressure from advocacy organizations.

The river has seen warm water, large algae blooms and dead trout, worrying both environmental groups and the guides who make their livelihood taking visitors fishing on one of Montana’s most renowned rivers.

DEQ said in a statement it has determined that an overabundance of nutrients, called “eutrophication,” and poor oxygen …

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