Gardaí responded to the scene and requested assistance from Clare Civil Defence.
Conditions were too dangerous to launch a rescue boat so gardaí and Civil Defence volunteers carried a search of the riverbank.
A man was later located clinging to the riverbank about a kilometre from the old quay in Clarecastle.
The casualty was carried ashore by Civil Defence members. He was assessed and treated at the scene by HSE paramedics before being taken to University Hospital Limerick for treatment.
It’s understood the man in his 20’s was suffering from hypothermia and exhaustion.