@Dhole dude You know it! This one looks like it may have been donated or purchased second hand, vs a big fancy one like Philly has. I've never actually seen an otter use one, or nearly use one.
Admittedly I've never seen an otter use a kiddie slide, but I have seen them use slides that are more built-in to the exhibit. LA's giant otter exhibit has a rock slide and the otters seem to love using it.