The Conwy river is tidal as far as Trefriw (hence the quay), so the newly-dredged river would still be full of sea water twice a day, and rainfall at spring tides would remain problematic.
(It was the arrival of the railway in Llanrwst in the 1860s that put the quay out of business, as it happens.)
Much of Llanrwst's flooding issues come from the dog-leg in the river just south of the town, before the river passes under the rail bridge. In times of heavy rainfall, the river can burst its banks here, and flow straight-on into the town. At that point, all the flood water is the wrong side of the railway alignment and held back from the river channel by the railway, hence its propensity for being washed out.
A very informative and interesting reply there, thank you.
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