It can get quite a flow going downstream at times so any waterborne debris can build up in short order - everything from the usual household rubbish to tree branches will happily float on the surface but even stuff under the water (e.g. the aforementioned sediment but also water-logged timber, old tyres and the like), can get pushed further down the river when there's a good current.
So you might not be facing just a wreck but also a pile of junk that's built up in front of the wreck, you'd have to treat any wrecked ship as being hazardous even before you've physically reached it.
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