. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Figure 13. Illinois dams of 10,000 acre feet or greater storage by year of construction. 100 Barge Traffic: Illinois and Mississippi Rivers Mississippi (pool 14) -?- Mississippi (pool 26) -?- Illinois (mouth to Lockport'. 1990 Figure 14. Volume of commercial traffic reported from sections of the upper Mississippi and Illinois rivers at 10-year intervals between 1950 and 1988. Pool 26 is above Alton
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Figure 13. Illinois dams of 10,000 acre feet or greater storage by year of construction. 100 Barge Traffic: Illinois and Mississippi Rivers Mississippi (pool 14) -?- Mississippi (pool 26) -?- Illinois (mouth to Lockport'. 1990 Figure 14. Volume of commercial traffic reported from sections of the upper Mississippi and Illinois rivers at 10-year intervals between 1950 and 1988. Pool 26 is above Alton and below the confluence of the Illinois and Mississippi rivers. Traffic reported from here is thus a composite of Illinois River traffic and traffic from the rest of the upper Mississippi River. Pool 14 is above Moline. Illinois River data is for the river below Lockport. is one fisherman fishing all or any part of one day) by the year 2010 (Figure 15). Although approximately 70% of angling days are spent on public and private lakes, Illinois streams receive considerable fishing pressure annually (Baur 1991). Overall, Illinois' streams have received approximately a 20% increase in total angling days from 1977 to 1989 (Figure 16). The Mississippi River has demonstrated the largest increase, receiving 52% more angling days in 1989 than it did in 1977. Other streams have received similar increases in fishing pressure (Figure 16). Fishing pressure in Illinois' small streams has fluctuated the most over the past decade and has actually experienced a 41% decrease in total angling days annually received since 1977 (Figure 16). However, the decline between 1986 and 1989 is probably a function of annual variation in water levels. Although overall fishing pressure in our streams has varied dramatically, the hierarchy of the most popu- larly sought sport fish has remained relatively consiani 182. Please note that these images are extracted from scanned page images that may have been digi
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