I don’t know if this is the correct forum for this. @moderator, please move this to the correct forum if this isn’t.
Under the Heading “Mapping 2” the link to the poster produces a 404 error. Tracing the problem I found an updated poster. See https://nhd.usgs.gov/NHDv2.2.1_poster_081216.pdf
This means the wiki is out of date (slightly).