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Figure 11-8 Spatial distribution of DO along the Ohio River downstream of Cincinnati: October-November 1963. Source: Hydroscience, 1969.

trends in DO near Cincinnati (Figure 11-9) and Louisville (Figure 11-12), the mean summer tenth percentile level of DO significantly improved after the CWA (19861995) in comparison to conditions before the CWA (1961-1970) (Figure 11-13).

Water quality data collected since the 1950s indicate increased compliance with federal and ORSANCO criteria for DO, BOD5, turbidity, pH, and many other water

Figure 11-9 Long-term trends of DO near Cincinnati, Ohio (River Miles 460-470) (RF1-05090203002). Source: USEPA STORET.

Figure 11-9 Long-term trends of DO near Cincinnati, Ohio (River Miles 460-470) (RF1-05090203002). Source: USEPA STORET.

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