In response to renshiwo's reply: Not since October, but no swimming was required then, when staying in the creekbed.
Also, FYI - When it is scoured out, there is a bypass on creek-right that leads you up and around the pool(s), so no swimming is ever really"required".
I was on the west end a few weeks ago. I hiked as far as Booger Canyon and did not cross water deeper than my shins. It is probably safe to assume you won't have to swim.
"I'm not a vegetarian because I love animals; I'm a vegetarian because I hate plants." A. Whitney Brown
I've been there twice, never had to do any swims, mostly ankle deep water and a few knee deep spots. There is a small pool or two that you can find cool off in, but nothing you would have to swim if you didn't want too.