Well, there's good news and there's bad news.
The bad news is the local animal control operation funded by my tax dollars doesn't do skunks. The good news is the gal suggested I look under P for pest control in the yellow pages. The bad news is the first place I called wanted $359. The good news is the other place wanted $150, and the fellow said he could come out this evening. The bad news is I'd rather not spend $150 on a skunk. The good news is there are three traps in the back yard, and in theory, at least, they capture skunks and prevent them from looking outside the trap so they won't get upset and squirt, and the fellow will pick up the critter in good order. The bad news is additional skunks cost $50 each. The good news is neighborhood cats and the fox aren't likely to end up in the traps. The bad news is it doesn't look as though there's a good, easy, affordable way to skunk-proof the deck.
Serves me right for not having a loud untrained dog in the back yard like all my neighbors, I guess.