In one long-polluted Ozark river, the little fish darting through the water and the rare mussels hiding on the pebbly bottom tell a story worth celebrating. They’re signs that the Spring River is benefitting from environmental cleanups after a century of mining pollution. A professor and his students are uncovering the evidence of recovery. But there’s a twist: They’ve also found a new environmental challenge unfolding farther upstream.

This episode was written, reported, produced and mixed by Celia Llopis-Jepsen. Up From Dust's editors are Mackenzie Martin and Stephen Koranda.