The unidentified 54-year-old woman, who works at the Oregon Hotel, told police that Gore had tried to forcibly French kiss her and groped at her in an attempt to have sex.
The police, however, concluded that there was insufficient evidence.
Gore, who was staying at the hotel during a global warming lecture tour in 2006, allegedly asked the hotel to call the massage therapist to his suite, complaining to her about the physical rigours of his heavy travel schedule.
But soon Gore angrily insisted she massage him around his groin and then pounced on her, she claimed.
"He pleaded, groped me, grabbed me, engulfed me in embrace, tongue kissed me, massaged me, grabbed my breasts," The Telegraph quoted her as telling the detectives.
She said she feared he might rape her as he "flipped me flat on my back and threw his whole body face down over atop me, pinning me down and outweighing me by quite a bit".
She claimed she later found stains on the front of her trousers and kept them as evidence, believing they were his body fluids.
Initially, after refusing to talk to detectives in 2006 fearing that her 'reputation might be destroyed by the scandal', the woman contacted the police again in 2009 and gave a detailed statement, insisting that she wanted no money in return.
However, she reportedly sold her story to the National Enquirer magazine for 1 million dollars.