Please see my solution to this problem at
https://community.esri.com/thread/174980
Sorry. I should have posted it here, but I lost track of my original post.
However, there is yet more bad news.
In using the data at a scale of 1:10K I also find that there
is no feature for the Willamette River in the basemap data.
I doubt that many of you care about that specifically; but
where there is one error, there are likely several, so
my conclusion about this 2015 basemap, both raw
data and layers, is that they are likely rife with errors.
Rob Stevens