The Lieze weir is situated in the Maas in the Belgian province of Liège, in the municipality of Visé. A hydroelectric power station is connected to the weir, which was commissioned in 1979. The plant has four turbines with a nominal capacity of 5,300 KW and delivers an average of 60 million KWh annually.
The weir also has an important function in regulating the water level in the Ternaaien Canal and the Albert Canal. The height difference at the weir is 6.7 meters. On the east side of the weir is a fish ladder.​
Getting past the weir with a kayak full of gear looks quite daunting but isn't that difficult. One hundred meter in front of the weir on the left bank is a concrete ledge where you can get out. Next follows a portage of about 200 meters. To get down to the river you can walk on a narrow concrete ramp right to the edge of the water.

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