Hello,
size limitations vary depending on the draft of the vessels as there are still some bends which are not yet extended/widened, especially in the eastern part of the canal. Extension works shall start next year. So actually there are following limitations:
with a draft of max. 9,5m: length 160m and width 27m or length 193m and width 20m
Final limit for ships with a draft of max. only 7,0m: length 235m and a width of max. 32,5m
The dimensions of the new locks are 310m x 42m.
But there are also dimensions in the air draft of max. 40m due to the 10 street and railway bridges which are crossing the canal.
All information taken from the private webpage
www.nord-ostsee-kanal-info.de which is unfortunately only in german. If you need any further info, please feel free to contact me.
Best regards,
Malte