Any plan advanced by the U.S Army Corps of Engineers or others to re-reverse the flow of the Chicago canal system will hasten the demise of Lake Michigan (ENR 5/21 p. 19). The Chicago River keeps 99.5% of the metropolitan area's stormwater and wastewater from discharging to the lake, arresting its rate of decline. Cities and watersheds in Indiana, Michigan and Wisconsin continue to discharge copious quantities of water containing non-regulated chemicals. Meanwhile, Asian carp have shown no inclination to move into the canal system due to its desolate habitat and absence of food for these voracious eaters. The Corps needs to be mindful of the impact on Lake Michigan.