The Great Lock Vianen is a sluice lock between the Lek River and the Merwede Canal south of the Lek, located in Vianen in the Dutch province of Utrecht. The waterway is CEMT class IV.
The lock has two consecutive sluice chambers measuring 120 m in length, 12 m in width, 24 m in chamber width, a depth at the outer sill of NAP -2.24 m, a depth at the middle and inner sill of KP -3.64 m, and a double drawbridge - the High Bridge - over the outer head, with a height in the closed position of NAP +6.50 m.
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