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According to Went (1954, 45) the first weir on the river Liffey was in the neighbourhood of Islandbridge. The Hospital of St John of Jerusalem at Kilmainham had the salmon weir until the dissolution when it was described as having four hachis or traps for catching salmon (op cit, 57). This was probably on the site of the present weir at Islandbridge, which was in use until the 18th century.
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