. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. URBAN DYNAMICS 1950*s. with the 1960 census showing a 61% popula- tion increase, the highest single growth in any category, approached only by Cook County's growth rate of 54% at the turn of the century. Collar County growth rates dominate the comparative presentation of growth rates for the last half of the century (Figure 13). The lOO-year Collar County aggregate growth rate is about 860%. Chicago
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. URBAN DYNAMICS 1950*s. with the 1960 census showing a 61% popula- tion increase, the highest single growth in any category, approached only by Cook County's growth rate of 54% at the turn of the century. Collar County growth rates dominate the comparative presentation of growth rates for the last half of the century (Figure 13). The lOO-year Collar County aggregate growth rate is about 860%. Chicago Metro Counties The Chicago Metro County category includes all "Collar Counties" and Cook County. The aggregate density of these counties was 1,639 persons per square mile in 1990. This density is about one-fourth the density of Cook County taken alone and about times the density of the collar counties, without Cook. The growth rates for the Chicago Metro counties are modulated by comparison to the collar and Cook rates taken independently. The 100-year Chicago Metro aggregate growth rate is about 415%. Kwkikae MSA Bloomlnglon MSA DtciturMSA OiHTiptlgn MSA — Sprhgntld MSA RockfordMSA Rock Mwd MSA PoofUMSA J^" E. SI. Louis MSA ' 1 1 1 1 1 Figure 14. One hundred year growth rates, 1890- 1990, downstate MSA's. Downstate '«MSA's" This category is composed of 18 counties within the downstate "MSA's" of East Saint Louis, Rock Island, Peoria, Rockford, Bloomington, Decatur, Champaign, Kankakee and Springfield (Figure 14). Population densities in this group have increased from 54 persons per square mile at the turn of the century to 190 in 1990. Growth rates are shown to be fairly steady in the 20-30% range until a drop-off to about 8% in 1940 and a subsequent return to a growth rate of about 20% in 1960. After 1960 there was a decline to marginal negative growth in 1990. The lOO-year Downstate "MSA" c
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