Now aged 15, the girl was victim to what detectives describe as a "horrifying ordeal" in Drumchapel, Glasgow in December 2011.
On Thursday December 15 between 8pm and 9.30pm the girl left a friend's house in Cloan Avenue and walked towards Garscadden Road via a footpath near Donald Dewar Sports Centre.
A man approached her on the bridge and started talking to her. As she got to the entrance of Southdeen Park, he pushed her into an alleyway.
He held her down on the ground and raped her, then ran off in an unknown direction and she made her way home.
The attacker is white, between 40 and 50-years-old, of stocky build and had short brown hair. He was wearing a grey jogging suit and a red Puffa jacket.
On his right thigh he has a tattoo of a ship's steering wheel and an Armani stud in his left ear.
Detective Inspector Dougie McKinlay appealed to the public for information about the attack or the attacker.
"This young girl was subjected to a horrifying ordeal and has been left so traumatised and devastated by it that she only found the courage to come forward to police last month," he said.
"I appreciate some time has passed since the crime occurred but I am asking people to think back, check their diaries. Would you have been in that area then? Do you go to or did you attend the Donald Dewar gym around that time? Do you recognise the description of the suspect?"
Anyone with information can call detectives at Drumchapel CID on 0141 532 3600 or Crimestoppers anonymously on 0800 555 111.
Meanwhile, a woman has been raped as she walked her dog in the early hours of the morning.
The 28-year-old was attacked by a man as she cut through an underpass in Livingston, West Lothian between 3.20am and 3.45am on Saturday.
She fell to the ground and was subjected to a horrific sexual assault, police said.
It happened in an underpass off Grange Road at the east side of Perth Street, in the Craigshill area of the town, Lothian and Borders Police said.
When the attacker made off, the woman made her way home and then went to St John's Hospital where police were contacted.
The man is white, 25-40 years old and has a Scottish accent, with collar-length black or brown hair and is of a small build.
He smelled strongly of body odour and alcohol and was wearing a dark-coloured fleece, a dark-coloured beanie hat with a silver line on it and white canvas trainers.
Police are appealing for a potential witness with two black Labrador-type dogs, who is thought to have been in the area at the time, to come forward.
Detective Inspector Matt Paden said: "This has been a horrific attack for the victim to endure and she is now being offered all the support and assistance she requires from Lothian and Borders Police and our partner agencies.
"We are keen to speak with anyone who was in or around the underpass in the Perth Street area in the early hours of Saturday morning and remembers seeing anything suspicious.
"We are particularly keen to trace a witness who may have been in the area with two dark Labrador-type dogs and would ask this individual to contact police immediately.
"Similarly, anyone with any other information that can assist with our enquiries is also asked to get in touch."
Anyone with any information is asked to call Lothian and Borders Police on 101 or Crimestoppers anonymously on 0800 555 111.
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