We went through Denham Lock, the deepest lock on the Grand Union Canal.
It’s 11ft 1″ or 3.4m deep.
It was very rough with white water. It took about five minutes or less to fill.
We held the rope whilst the boat was coming up. There was also a young man with a cruiser in the lock.
The lock was built about 200 years ago.
There was also a cafe at Denham Lock called Fran’s Tea Room.