. The Changing Illinois environment : critical trends : summary report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. 18 ⢠The Changing Illinois Environment Urbanization is encroaching on Illinois streams. ⢠In Champaign County, urban uses along streams increased more than 37% from 1958 to 1988, and much of that occurred within 100 feet of the water. Page 19-20 Figure 3-2 Estimates of Statewide Pollutant Discharge Loading for Analyzed Major Municipalities 30 25 20 3 15 10 0. 1989 1990 1991 1987 1988 ^M Total Suspen
. The Changing Illinois environment : critical trends : summary report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. 18 ⢠The Changing Illinois Environment Urbanization is encroaching on Illinois streams. ⢠In Champaign County, urban uses along streams increased more than 37% from 1958 to 1988, and much of that occurred within 100 feet of the water. Page 19-20 Figure 3-2 Estimates of Statewide Pollutant Discharge Loading for Analyzed Major Municipalities 30 25 20 3 15 10 0. 1989 1990 1991 1987 1988 ^M Total Suspended Solids ^M Biological/Carbonaceous Biological Oxygen Demand §â Ammonia 1992 reported loadings of ammonia that were 65% lower in 1992 than in 1987. Sevenr>-one facilities showed a 42% decline in discharges of total suspended solids. Sixty-one facili- ties reported that from 1987 to 1992 loading of residual chlorine from chlorination had dropped by almost 25%. (Figure 3-2) Trends in loadings of chromium, copper, cyanide, and phenols from major manufacturing and utility facilities also showed declines between 1987 and 1992, with reductions ranging vari- ously from 37% to 53%. In spite of these improvements, the num- ber of fish kills has increased since 1965. Although numbers fluctu- ate from year to year, the annual number of fish killed by pollution (rather than by drought or other natural causes) has been rising. The proportion of kills attributable to industrial point sources has declined in the last 30 years and now stands at roughly 10%. Similarly, fish kills attributable to acid runoff from coal-mine waste are becoming rarer as abandoned mine sites are cleaned up. Kills attributable to agriculture, often from unregulated nonpoint sources, have risen steadily. Analysis of data from 28 permanent fish census stations on the Illinois River for the years 1963 and 1*^92 reveal what appears to be a general trend toward recover)- in terms of certain measures of stream
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