Bridge number 3 (Brug Drie) Krijtbergbrug sometimes called sluis instead of brug (Sluis originally or is still a lock) (Brug No. 3) Bridge No. 3
Named after the neighbouring Krijtberg or Sint Franciscus Xavieruskerk on the Singel. The church dates from 1883 and took the place of the former secret church in the Crijtberg house, which served the Jesuits.
More at https://nl.wikipedia.org/wiki/Krijtbergsluis