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RG52M 756/17586: Items are rolled.

RG52M 81203/37: Most of the plans were drawn up by the Canadian Bridge Company Ltd., of Windsor, ON.

RG52M 81203/54: Design was worked out by the Wellman-Seaver-Morgan Company of Cleveland, Ohio, U.S.A., to conform to general plans and specifications prepared by the Chief Engineer of the Welland Ship Canal with the former Dept. of Railways and Canals. The main contract was let to the Collingwood Shipyards to construct the pontoons and superstructure, but various contracts were sub-let for the mechanical and electrical equipment. Accession lacks items #60-63.

RG52M 81203/62: Plans are numbered from 20 to 79544. A few plans do not fall within this number sequence. An example of a number is: FE 14, File 6, C-7127-1.

RG52M 86703/38: Most of the plans were prepared by the firms of Harrington, Howard and Ash, or by the Hamilton Bridge Works Company Limited. There is also one plan of the Lachine Canal.

Title is based on the contents of the series.

RG52M 81203/54: Most of the drawings were signed by Alex J. Grant, Engineer-in-charge, Welland Ship Canal and by A.E. Dubuc, Chief Engineer, Dept. of Railways and Canals. RG52M 86703/38: Some items are stamped with the bridge project name and number.

RG52M 756/17586: Some items are torn at the edges. RG52M 78903/7: Most of the sheets have holes punched along one side.

RG52M 73/27727 transferred in 1973 from the St. Lawrence Seaway Authority. RG52M 756/17586 transferred in 1975 from the S.L.S.A. RG52M 78903/7 transferred in 1973 from the S.L.S.A., but was not accessioned until 1978. RG52M 81203/37 transferred in 1981, and RG52M 81203/62 transferred in Feb. 1982, from the St. Catharines office of the S.L.S.A. RG52M 81203/54 transferred in Dec. 1981 to the National Map Collection. RG52M 86703/38 transferred at an unknown date to the National Map Collection, by the St. Lawrence Seaway Administration. Provenance of RG52M 78903/8 is uncertain.

RG52M 81203/54: Canada. Dept. of Railways and Canals. The Welland Ship Canal, 1913-1932. London : Offices of "Engineering", 1935. [PAAP, TC627, W4C6]

RG52M 86703/38: The listing's original items marked in yellow are in the files of the St. Catharines office of the S.L.S.A. Those original items marked in red have been transferred by the S.L.S.A. to the Dept. of Public Works, Welland, ON.

Scales differ.

RG52M 81203/54: After disposal of the equipment, the St. Catharines office had microfilm copies prepared. The security copy of the microfilm is stored at the SLSA Head Office in Cornwall, ON.

RG52M 73/27727: Originally received 336 items (47 plans of Welland Ship Canal; 130 sheets of an estimate for swing birdge, Port Dalhousie, ON.; 151 miscellaneous items of Welland Ship Canal; 8 plans of Lakeview Cemetery, Thorold, ON.). But there is no information about disposal.

RG52M 78903/8: Date of creation, [ca. 1964], taken from article on history of improvements to the Welland Canal section of the St. Lawrence Seaway.

Further accruals are expected.

Technical drawing: RG52M 81203/37 and RG52M 86703/38 contain drawings of bridge #12.