A complaint that a 15-year-old girl was attacked and raped at knifepoint at Hamilton Lake has been deemed false.

Police launched an extensive investigation into the alleged complaint in September 2014 and said the findings were helped by a large amount of assistance from the public.

The offender was made up.

Detective sergeant Kristine Clarke said the outcome should reassure the public about the popular hang out.

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"Police are not able to comment any further on the specifics of this investigation, however, we did want to provide some reassurance to the local community and visitors to the lake area, who were naturally very concerned about public safety following this complaint."

Police said at the time the schoolgirl was walking along Ruakiwi Rd next to Lake Rotoroa about 3.30pm on Wednesday, September 10 when she was grabbed and pulled to the southern side of the water tower and raped.

A description of the man was given at the time, but it has since been discovered that he did not exist.