Yes, boatramps in Florida always are, and sidewalks are icy in Minnesota this time of year.
Like I said, walk more carefully, it’s not the city/state/county government’s job to keep us all upright.
Careful barely enters into it. This is friction-free walking. You need cat-like reflexes and luck to avoid getting hurt. The surface should not be bare wood. The wild areas in Oregon are treacherous enough, and people clueless enough that there should be a rough, well-drained textured finish on the bridge in question.