Mississippi River grows saltier as road salt washes into waterways
New data reveal that levels of chloride – one of the elements that make up salt – have increased by more than a third since the late 1980s.
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New data reveal that levels of chloride – one of the elements that make up salt – have increased by more than a third since the late 1980s.
Chloride levels are increasing at all Wisconsin monitoring sites and across the Upper Mississippi River basin.
Amid a growing awareness of how salt harms freshwater sources, some counties have dramatically cut back on road salting.
"This winter has already brought significant snowfall to much of the U.S. Historically, more snow has meant more road salt. It’s an effective way to clear roads — but also brings cascading environmental impacts as it washes into rivers and streams."
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