The talk was all of the trade that came and went on the waterways and the growth of the traffic on the river, as the roads out of the East towards Mirkwood vanished or fell into disuse; and of the bickerings of the Lake-men and the Wood-elves about the upkeep of the Forest River and the care of the banks.
There are no more uses of "upkeep" in the book.
Show samples from other sources
Just basic upkeep.
Gillian Flynn -- Gone Girl
"Courtesans go through the same experience: they’re taken in at a young age, and are bound to their brothels until they can earn back every coin that went into their training, upkeep, and wardrobe."