. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Esocids \An<i^^/iViWi Morone spp. 1 tiYiYn Walleye N MM H Ml M IHW «»-tT* Total lor all species ?*H«»tJiJ**4tiil« g^Vt-^y^l^. 1955 1965 1975 1985 Lake Michigan is the third largest of the Great Lakes and the sixth largest freshwater lake in the world. The lake is 307 miles from north to south, with a maximum width of 118 miles. The average depth is 85 m (279 ft), and the deepest basin is at 282 m
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Esocids \An<i^^/iViWi Morone spp. 1 tiYiYn Walleye N MM H Ml M IHW «»-tT* Total lor all species ?*H«»tJiJ**4tiil« g^Vt-^y^l^. 1955 1965 1975 1985 Lake Michigan is the third largest of the Great Lakes and the sixth largest freshwater lake in the world. The lake is 307 miles from north to south, with a maximum width of 118 miles. The average depth is 85 m (279 ft), and the deepest basin is at 282 m (925 ft). The main basin of the lake is oligotrophic. In contrast, Green Bay on the northwestern edge of Lake Michigan has a maximum depth of 35 m (110 ft). This warm, eutrophic system is inhabited by a fauna that is not found elsewhere in the lake and will not be addressed in this document. The main drainage of the lake is through the Mackinac Straits at the north end into Lake Huron, and the retention time of water in Lake Michigan is estimated at 99 years. The Lake Michigan basin is composed of glacial till varying from hard pan clay to bedrock, gravel, and cobble; several reef areas— notably the Sheboygan Reef complex, Julian's Reef. Wilmette Reef and Highland Park Reef—are composed of solid and broken bedrock. Lake Michigan's water and resources are shared and managed by four states: Michigan, Wisconsin, Illinois, and Indiana. The sport fishery is the second largest in Figure 9. Numbers offish stocked into all Illinois lakes and reservoirs, 1954 to 1992. Crappie spp. include white crappie, black crappie, and hybrids; esocids include northern pike, muskellunge, and hybrids; Morone spp. include striped bass, white bass, and hybrids. The bottom graph depicts the totals for all species, including some not shown in other graphs. the Great Lakes, with an estimated economic impact of $332 million annually. Commercial fishing brings in 50 million pounds of fish annually
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