Lindon, Rivendell, and Eregion in the Fourth Age

Obviously Tolkien is vague about the happenings in Middle Earth after the third age ends. From what I've read, the Dwarves slowly retreat into their mountains and disappear, and the last of the elves sail west after Aragorn passes around 120 F.O. I was wondering if there any more information about what happens to Lindon, Rivendell, and Eregion in that time period. I think I read something about Imladris' library being moved to Gondor, but wonder whether eventually Arnor would have claimed the areas in the north once the elves are gone. I'm mostly looking at Lindon because of is location along the coast and the multiple ports and possible ship building facilities in may have had. With Hollin, any map I find on the reunited Kingdom doesn't include that area.