Lot's of canals have to be dredged regularly (and usually frequently) to continue functioning. (That includes canals as big as the Suez, BTW.) They'll silt up fast. According to Life after People, most smaller canals will turn into marshes and meadows in less than a century. Larger ones will just take longer to block up.
An interesting thought about the world's major canals is that, even if not nuked, and even if the locks still function (or can be put into working order), there might be so much shipping sunk in them that they still could not be used. The Suez, for example, was unusable until after the 1956 war -- and it had been put out of action to all but the smallest ships in 1948 by sunken ships.
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