Police and lifeboat teams were called to reports of man on Carlisle Bridge in Lancaster at 1.30am on Tuesday.
The man was reported to be in a low mood and at risk of jumping into the River Lune from the bridge.
The inshore lifeboat and inshore rescue hovercraft were transported by road to Snatchems from where they could be launched onto the river.
The inshore lifeboat then proceeded to the scene of the incident, taking up position 50 metres downstream from Carlisle Bridge, whilst the hovercraft remained on standby outside the Golden Ball Inn.
Local Coastguard, Fire Service and Ambulance teams were also in attendance.
At 3.20am, the man surrendered himself into police custody and the volunteer lifeboat crew were able to stand down and return to station.
Morecambe RNLI Lifeboat operations manager, Kevin Jackson, said: “No matter what the hour, we will always respond to requests for assistance when lives are at risk.
“We are just pleased that there was a positive outcome to the incident.”