Word: lakes
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Dates: during 1970-1979
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That's the sign of a healthy lake, but it's yet to happen except in a few very isolated localities...
...discolored by discharges from the steel plants of Gary, Ind., the oil refineries of Hamilton, Ont., and the paper mills of Green Bay, Wis. Raw sewage was regularly added to the noxious brew. Said a 1970 joint U.S.-Canadian report: "Approximately one-third of the United States shoreline [on Lake Erie] is either continuously or intermittently fouled with bacterial contamination...
...most important omens for the future of the lakes is the sharp reduction in the amount of phosphorus dumped into them. A 1972 U.S.-Canadian agreement lowered the levels of phosphates that municipalities were allowed to dump into the water, and most towns along the shores and on rivers emptying into the lakes are well on their way toward meeting those requirements. The significant exception is the city of Detroit; it continues to dump three times the permissible levels into the Detroit River, which flows into the western end of Lake Erie. One of the largest sources of the harmful...
...Even in Lake Erie we now expect DDT to disappear completely in a rather short time. In fact, it is now difficult to find it anywhere in the lake except in the sediment...
Large game fish are making a comeback. Virtually wiped out by overfishing, pollution and the eellike sea lamprey (an ocean predator that apparently first migrated from the Hudson River into the lakes after man had opened the way with the Erie Canal, the native lake trout is again being pulled from the lakes by sports fishermen, who now can also catch coho and chinook salmon from the Pacific Ocean. Still, despite the fact that the waters are cleaner and the lamprey has been contained by a concerted attack on its breeding ground, the game fish population can be sustained only...