A hoax on PureVolume has been exposed as just that. His page on the site has statements like:

 

Above all, the goal of Oregon was to rediscover the joy of making music, free of self-imposed boundaries. Ironic, you might say, given the context of the 50 States Project, but Sufjan Stevens was never a man to shy away from contradiction. Recorded at record pace, with some tracks nearly improvised, it is a conscious attempt to capture the moment of creation, the warm glow of the live performance, an eclectic mixture of unforgettable songs blazing trails westward, reminding of home, encompassing all sounds and textures.

 

Also, there's a new song called "Portland or, Whistling Underwater"...that sounds nothing like Sufjan Stevens. Turns out it's not. Pitchfork reports, "The whole thing-- the song, the album, the entire PureVolume page-- is a complete fake. According to Sufjan's label Asthmatic Kitty, Mr. Stevens had nothing to do with any of it."

 

Check the page here.