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I took my own advice and returned to Arzviller to walk the full section of closed canal. It turns out the upper part is less overgrown and more active than the lower end. I'd only gone from the bottom lock, n°17, up to lock n°14 (under the railway bridge) at the time.
Starting from the top, the house at lock n°2 is a crêperie restaurant, while lock n°4 is a gîte complete with a private fishing pier. I counted four lock houses with some form of art going (n°2, 10, 13 and 15). The other lock houses are more or less well-maintained residences. There are no houses standing at locks n°14 and 17.
The Vallée des Éclusiers, or Lock-keepers' Valley, is well worth the wander. The quickest is either to drive there or cycle from Lutzelbourg station. But more on the logistics tomorrow - for now, let's enjoy lock n°9, probably the most dramatic on the route.