of more than 20 ft and one ton, transit the seaway. The tolls have been fixed for 2017 at $30 per lock. There is a $5 per lock discount for payment in advance. Lockages are scheduled 12 hours a day between the hours of 07:00 and 19:00 from June 15 to September 15. A list of organisations that serve the seaway in some fashion, such as chambers of commerce and municipal or port authorities, is available at the SLSDC website. A 56-page electronic "Great Lakes St. Lawrence Seaway System" Directory is published by Harbor House Publishers. Map Map of the world Great Lakes and the St. Lawrence Seaway from 1959, depicting the entire length beginning at the Gulf of St. Lawrence in the east to the westernmost terminus at Lake Superior. See also Container on barge Glossary of nautical terms (A-L) Glossary of nautical terms (M-Z) Great Lakes Waterway Lachine Canal Lake Champlain Seaway Lake freighter Merchant vessel Navigability Seawaymax Ship transport Soulanges Canal Watercraft Waterway References Notes Further reading Macfarlane, Daniel (2014). Negotiating a River: Canada, the US, and the Creation of the St. Lawrence Seaway. Vancouver: UBC Press. Parr, Joy (2010). Sensing Changes: Technologies, Environments, and the Everyday, 1953-2003. Vancouver: UBC Press. St. Lawrence Seaway Management Corporation (2006) "Seaway Handbook" Cornwall, Ontario, Canada. External links Tommy Trent's ABC's of the Seaway, a brochure for young people Great Lakes St Lawrence Seaway System web site The St Lawrence Seaway Development Corporation "Stairways to the Seas". Popular Mechanics, January 1959, pp. 97–103. Detail article with illustrations of lock system. St. Lawrence Seaway April 25, 1959 Documents and Photographs relating to the St. Lawrence Seaway, Dwight D. Eisenhower Presidential Library The Lost Villages Historical Society Excerpt from the Illustrated London News, January 11, 1862 describing the Canals of Canada. The Great Waterway: a site dedicated to tourism along the waterway from Lake Ontario to Cornwall and the Seaway Valley Exchange of Notes, amending 1959 Agreement of Application of Tolls CBC Digital Archives – The St Lawrence Seaway: Gateway to the world Bibliography on Water Resources and International Law See Great Lakes; St. Lawrence River and Seaway. Peace Palace Library Channel Depth and Width and Length St. Lawrence Waterway Project Report Clippings, 1921 Brock University Library Digital Repository 1959 establishments in Canada Canada–United States relations Canals opened in 1959 Great Lakes Waterway International canals Locks of Canada Port authorities in Canada Ship