Unprecedented rain in southeastern Saskatchewan is causing waterlogged highways and other infrastructure to crumble.

On Tuesday morning, a section of Highway 56 north of Indian Head fell apart as a CBC reporter watched.

Earlier, near Sintaluta on the Trans-Canada Highway, rushing water ripped a culvert out of the ground.

According to Highways Ministry spokesman Doug Wakabayashi, "catastrophic" damage has been found to bridges on Highway 47 south of Estevan and Highway 36 north of Willowbunch.

The Trans-Canada from Balgonie to Whitewood was closed Monday afternoon and remained closed Tuesday.

There's no estimate on when it might be open, Highways Department officials said.

Check hotline first

Because many routes are closed because of damage or water over the road, people are being told to check the Highways Hotline before they head out.

Around Yorkton and other areas in the south, some road sections were already crumbling after the spring melt. With recent record-setting rains, the situation has worsened.

Meanwhile, rain continues to fall on much of the southeast. Estevan, which is having its rainiest May and June ever, got another 20 millimetres Monday night.

Close to 50 millimetres fell on Indian Head, worsening the flooding problems on the Trans-Canada.

Some sections of the highway, normally Saskatchewan's busiest, are under a metre of water.

A semi got stuck Monday trying to get through a flooded section, and the truck was still there the next morning.

Another trucker had to spend the night at the roadblock, sleeping in his vehicle.

Hundreds of people have been displaced from their homes over the past week because of flooding and sewage backup.

Radville, Weyburn, Yellow Grass, Roche Percee and the Estevan area have all been hit hard.

More rain is in the forecast Tuesday.