Figure 11-11 Long-term trends of DO at Markland Lock & Dam, Kentucky (River Miles 449-453) (RF1-05140101010). Source: USEPA STORET.

Figure 11-12 Long-term trends of DO at Louisville, Kentucky (River Miles 364-388) (RF1-05140101001). Source: USEPA STORET.

and zinc. An indication of the improving water quality in the Ohio River is the marked increase in diversity of fish species, with the greatest improvement seen in the upper reaches of the river (Figure 11-14). Increases are primarily noted in sport and commercially valuable species, which tend to be more pollution-sensitive than other fish species.

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