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Great Lakes Connecting Channels and Harbors, St.Mary Falls Canal Lock, Sault ...
Volledige weergave - 1986
action additional alternative analysis approach approximately aquatic associated average annual benefits capacity changes channels common completed concrete connecting construction continue Corps cost Davis Lock delay depth designed disposal dredging economic effect Engineers environmental estimated evaluation existing expected facilities feasibility Federal feet Fish and Wildlife fleet future habitat harbors identified impacts improvements increase iron Island Lake Superior Lakes larger levels located lock major Marys Falls Canal Marys River material maximum Michigan miles million miter gate monitoring navigation needs Northwest occur operation percent period placed plant Poe Lock Point possible potential present probably problems production proposed Rapids reduce region rehabilitation result Sabin Locks Sault savings Service significant Soo Locks species steel structure Table term tonnage tons traffic transits transportation upper upstream utilization vessels wall Wetland