Oohh, cute, interesting. Harriet, thanks for posting, because I have felt so gauche in that I could not make myself drop the "r".
I like the young linguists looking at this.
And I think this is probably a fairly consistent phenomenon, that a local population will evolve its own pronunciation and entering folks WILL apply rules from other situations.
Cases in point: I live in Suffolk (Suffik -- not proper symbols, I know) County, but my dad insisted on calling it Suffo-l-k county.
And visitors frequently call Houston Street in New York Houston Street as in Houston, Texas.
I think Bowdoin has a more interesting problem with it's name, which is wittily addressed in a cartoon on its website. Just when the pronunciation is sorted out, I think someone says, "Oh, so this is Colby?"
Vassar actually imports a program to pronounce Poughkeepsie for purusers.