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Montana Drafts Big Hole River Impairment, Drying Threat Looms

6/26/2026

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Summary

Story summary

Montana DEQ issued a draft eutrophication impairment for the Big Hole River; final decision not due until 2027, and the river now flows at about one-quarter of normal volume, risking dry conditions within weeks.
Andy Ulven said listing could formalize issue and allow Loads for nitrogen, phosphorus and temperature; Trout Unlimited may receive funding for restoration, and a lawsuit over House Bill 664 could force nutrient standards by 2027.

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Story summary

Montana DEQ issued a draft eutrophication impairment for the Big Hole River; final decision not due until 2027, and the river now flows at about one-quarter of normal volume, risking dry conditions within weeks.
Andy Ulven said listing could formalize issue and allow Loads for nitrogen, phosphorus and temperature; Trout Unlimited may receive funding for restoration, and a lawsuit over House Bill 664 could force nutrient standards by 2027.