Boating Coach
On the waterQuestion 312 of 566

Which vessel may NOT pass through St. Lawrence Seaway locks?

  1. A boat of 8 m.
  2. A boat of 2000 kg.
  3. A boat under 6 m long.
  4. A boat with a motor of 50 hp.
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Correct answer: A boat under 6 m long.

The seaway is mainly a commercial route. Boats under 6 m, under 900 kg and sailboats under sail are not allowed.

Source: Safe Boating Guide (TP 511E, 2026), Visiting historic canals and locks, page 41

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Questions last reviewed: 18 October 2026