Montana
Montana DEQ says Big Hole River impaired by low oxygen, excess nutrients
DILLON, Mont. — Low oxygen levels and excess nutrients led the Montana Department of Environmental Quality to officially determine that the Big Hole River is impaired, state officials said.
The conditions are affecting aquatic life and recreation along parts of the river. Officials said the nutrients can fuel algae and plant growth, especially during hot, low-water conditions.
The Big Hole has been the focus of water quality restoration efforts for decades, with more than $1.3 million in federal Clean Water Act funding invested since 1988.
The impairment will be included in DEQ’s next water quality report. Restoration work and funding for the watershed will continue.