Love this song and thought of it as a name for my 2nd cache. Also its not next to the river but it is next to the canal lock.
When I went to place it today I was a bit sad as this section of the waterway had drained away, looks like a faulty lock and if you are a boater you wont be going pass this section for a while.
You are looking for a nano magnetic cache and will need a pair of tweezers or paperclip to access the log book.
Watch out for muggles along the tow path