Source: The St. Lawrence Seaway Authority and Saint Lawrence Seaway
Note: Before 1999, coal tonnage was part of bulk.
Composition of the Traffic Transiting Through the St.
Lawrence Seaway, 1978-2016
The traffic handled by the seaway
is dominated by bulk cargo (iron ore and coal), with general cargo accounting for only
5% of the total tonnage, a share that has been declining. This implies that the great majority of
ships using the seaway are bulk carriers. The Seaway is also an
important gateway for the export of North American grain on