Boromir's search for Imladris

[Inziladun]

Originally Posted by Erendis

Supposing he continued by following Mitheitheil's stream to the Last Bridge,that brings him rather close to Weathertop.

But what would have induced him to go west to Weathertop?

I'm going on the assumption that Boromir at least knew the general area in which Imladris was located; in a valley near the Ford of Bruinen, close to the Mountains. If that was the case, his traveling to Weathertop, which would have been at least an extra day or two's journey out of his way west, would have been unlikely.