. Critical trends assessment Program 2002 report. Critical Trends Assessment Project; Ecosystem management; Environmental monitoring; Natural resources surveys. Figure 5. Distribution of stream quality grades, all samples and random sites Table 7. Stream quality grades based on reference sites Excellent Good Fair Greater than mean of mean -1 to -2 biological scores to-lSD SD Poor 56
. Critical trends assessment Program 2002 report. Critical Trends Assessment Project; Ecosystem management; Environmental monitoring; Natural resources surveys. Figure 5. Distribution of stream quality grades, all samples and random sites Table 7. Stream quality grades based on reference sites Excellent Good Fair Greater than mean of mean -1 to -2 biological scores to-lSD SD Poor < Figure 6 shows the distribution of stream quality across the natural division and width categories. About 45- 50% of the streams in the Shawnee/Ozark and Driftless/Rock are in excellent condition, while about 40% of the streams monitored in the Southern Till PlainAVabash and Northeast Morainal are poor in quality. Many of the larger streams in the Grand Prairie and Western Forest Prairie also had fairly high Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Dept. of Energy and Natural Resources; Illinois. Natural History Survey Division; Critical Trends Assessment Project. [Illinois] : Illinois Dept. of Energy and Natural Resources, Office of Realty and Environmental Palnning : Office of Scientific Research and Analysis, Natural History Survey Division
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