Rijkswaterstaat publishes quite a lot of information online. Water levels can be seen on a map[1] on waterinfo.rws.nl. It also offers access to historic data in CSV format, but that is handled through a wizard and you get the data by email apparently.
Information about sluices, bridges, etc. can be found on vaarweginformatie.nl, including the live status of many of them. The Ijmuiden sluice complex doesn't have a live status it seems. See [2] for the map.
Information about sluices, bridges, etc. can be found on vaarweginformatie.nl, including the live status of many of them. The Ijmuiden sluice complex doesn't have a live status it seems. See [2] for the map.
[1]: https://waterinfo.rws.nl/#/publiek/waterhoogte [2]: https://www.vaarweginformatie.nl/frp/main/#/geo/map