West Mercia Police say officers received a report that a woman had been raped at around 4.30am on Sunday and attended the scene.
A 24-year-old man was arrested on suspicion of rape and remains in police custody, the force said.
There is an increased police presence in Hereford after the incident, although there is “no wider risk to the public” according to Detective Inspector Colin Berry from the force.
The victim is currently being supported by specially trained officers.
“Following the review of CCTV footage, there are people passing through the area around the time of the incident that we would like to speak with,” said DI Berry.
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