Two men are missing after a pickup truck was swept off a bridge by flood water in east-central Saskatchewan on Sunday.

A third man, who escaped from the vehicle, has been arrested, RCMP said.

The incident happened just before 8:30 p.m. CST, about five kilometres northwest of the town of Springside, 200 kilometres northeast of Regina, police said.

The three men, all from Yorkton, Sask., were heading south along a grid road in the pickup when the driver tried to cross a low bridge covered with water. The truck was caught in the current and swept off the road into the Whitesand River.

A 65-year-old man escaped to shore, climbed up the gully and went to get help from an area resident. Police have not said why he was arrested, but did say that so far he hasn't been charged with anything.

The two other men have not been located and police cannot confirm if they were able to get out of the truck, which was left submerged.

The names of the men haven't been released.

An RCMP underwater recovery team, an accident reconstruction specialist and a police dog were called in to help with the search and investigation. An initial search of the gully and the riverbanks downstream from the low-level crossing failed to turn up anything.

It has been a summer of extreme weather for Saskatchewan. In recent weeks, several communities have been hit by flash floods after heavy rain, and more than a dozen homes on the Kawacatoose First Nation near Raymore were destroyed by a tornado.