The service hours of locks and bridges depend on the area you are boating in.
The operating hours in Belgium different in the Flemish and the Walloon Region. “Waterwegen en Zeekanaal” and “NV De Scheepvaart” manage the Flemish waterways. To get the opening hours of the Walloon waterways you can visit the website of “Office de Promotion des Voies Navigables”.
The service times in France are listed on the website of the VNF. “Voies Navigables de France” is responsible for managing the French waterways and specifies the operating hours of the locks and bridges on its website.