There were some white ones in Ontario. This was in the 70s and 80s; think it was J&H Feedstor. They were top unloading with silage thrown down a tunnel in the centre,  which was formed as the silo was filled.
I heard of one where the family came home one weekend to help dad when he was in hospital; they filled the silo without raising the unloader as the silo was being filled. It may still be full!

Thanks to BrentOntario for showing proper name.