Status and Trends of Selected Resources of the Upper Mississippi River System

Figure 2.7. The percentage of backwater sampling sites where dissolved oxygen concentrations during winter, at the surface or just below ice cover, were >5 mg/L (1994–2002) for fi ve study reaches of the Figure 2.8. Percent of backwaters that contained suitable habitat for sunfi shes during winter from 1994 and 2002 based on a combination of temperature, dissolved oxygen, and depth in study reaches of the Long Term Resource Monitoring Program that have backwater habitats. .