A man has been rescued by police after falling into a flowing creek and suffering serious injuries including a broken leg.

About 10:30pm yesterday two senior police officers were conducting patrols at the Nimbin MardiGrass festival when they were approached by witnesses and told about the incident.

It is believed a 29-year-old man from Queensland was running along Sibley Street, Nimbin, when he failed to see the overgrown creek and fell six metres.

Local police officer, Sergeant Dave Longfield, entered the flowing creek and found the injured man lying face down.

Sergeant Longfield was assisted by a number of other people and remained in the water with the injured man for over 40 minutes while keeping him calm and still.

Inspector Nicole Bruce remained on the banks of the creek and co-ordinated the man’s rescue.

He was removed from the water about 11:40pm by officers from the Police Rescue Squad with the assistance of NSW Ambulance Paramedics.

He was taken to Lismore Hospital suffering from a broken leg, head and chest injuries and remains in a stable condition.