Nope. I have never been made to read Grapes of Wrath.
My junior year? Hmm.....they made me read: Huck Finn, The Great Gatsby, The Crucible, The Scarlet Letter, and Heart of Darkness.
Senior year I read: Beowulf, Wuthering Heights(my fav book ever), Lord of the Flies, Crime and Punishment......and I think that was it. Funny b/c my Senior year I was in Advanced Placement English and I think I did less reading than any other year.
Huck Finn, Great Gatsby, and Scarlet Letter were among my junior year American lit books as well. Curious that Grapes of Wrath wasn't on yours. I had a Steinbeck hat trick junior year: that one, Of Mice And Men, and East of Eden. He's a good author. I like him.