What undergraduate work stays on a CV once you start graduate school?
If you are considering writing and publishing something in an undergraduate publication -- don't do it for the sheen it might add to your CV.  If you do it, do it because you find the subject matter interesting and you think you can write an article others would enjoy reading.

Note, the more you write, the better you get at writing.

(Separately, after publication, you could ask for guidance about what to include and what to exclude from your CV, if the existing Q&amp;As here have left this an open question.)