Two species of fish are immediate beneficiaries: the federally threatened leopard darter and the Ouachita-strain smallmouth bass.

CNN: Migrating fish get help in uphill battle

Peter Kephart, a lanky man with an ever-ready smile, guides a bit for smallmouth on the Potomac River.

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The Ouachita smallmouth is a fairly recent discovery, a form of smallmouth bass unique to that part of Oklahoma and Arkansas.

CNN: Migrating fish get help in uphill battle

More than 2, 000 miles of streams are polluted by mine drainage, and smallmouth bass in the lower region are suffering from increasing levels of disease, Swartz said.

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According to Paul Balkenbush, stream fish biologist for the Oklahoma Department of Wildlife Conservation, improved culvert designs allow native smallmouth to reach necessary habitat at high flows.

CNN: Migrating fish get help in uphill battle

For example, walleye and smallmouth bass from the St.

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