lake swimming in Zurich during Autumn and Spring

The public badis close in almost 10 days, I was wondering, what are some spots where people commonly go to in order to swim ( either Zurich lake or Limmat river ) during Autumn and Spring ( or even winter ! )

There is a group called 4 season outdoor swimmers.
They dont seems to have a website, but there is a facebook group.

https://www.facebook.com/groups/winteroutdooorswimming

I think they all stay open but all the facilites are closed-changing rooms etc etc.

Seebad Enge re-opens as a sauna. In recent years they've also had swim-only tickets (along with use of changing rooms/showers) for 5fr.

Yes, and Seebad Utoquai (and Freibad Seebach) don't actually close until 30th October. If you have a summer season ticket, it will work until then.