My opinion? Your situation falls into the category of "Not Worth Worrying About."
As long as your chain was lubed before, I don't think it really matters. It's not like some water is going to wash off what lube you had on there. If it does, you're using the wrong lube.
Can't imagine you don't have an 0-ring chain.
Some guys completely immerse their chains in water crossings and ride for miles and miles afterwards.
I don't think it's an issue. The most you might get is some unsightly rust on your side plates if they weren't previously coated with some kind of "distillate."
I'm not much into chain threads and have nothing to back this up, but with 0-ring chains, my theory is that somebody who never even cleans or lubes their chain will still get 75% of the chain/sprocket life of somebody who does so on a regular basis.
Unless you apply it prior to every ride, I don't think there's any product out there that provides continuous lubrication between the rollers and sprocket teeth. It's either going to cook/fling off or attract dust and grit to the point where you don't really gain anything by using it. If you've got a ring chain, no worries about internal wear because no water or dirt should ever get there in the first place.
Again, I have no data to back up my theory. I do think chain lube is more critical on high-performance bikes where the chain is really stressed and taking a load and where attracted dust and dirt isn't really a concern.
I may be wrong. I dunno. I've got 15,000 miles on my stock chain with the 500-mile interval and both chain and sprockets are just fine. Would I intentionally never clean and lube it? No, I can't bring myself to do that, but I figure every 500 miles is good enough.