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Magistrato alle acque is the body responsible for managing the water network in the Venice lagoon.
The plaque probably describes the last renovation made to the bridge. On the other side of the pillar is an inscription with the names of the person responsible for the renovation of the bridge This inscription was taken on the same day by the same photographer Click for a larger image
The pedestrian bridge connects the Cannaregio area with the train station area and crosses the Canale di Cannaregio. The original wooden bridge was built in 1285 and was replaced by a stone bridge in 1580. The turrets at the ends of the bridge were added in 1823.
Translation of the text on the sign: Magistrato alle Acque Restored Year 1987