UPDATE 4 P.M.
Hwy. 169 will stay closed southbound south of St. Peter overnight, following the mudslide that shut the road just before noon.
UPDATE: 1:50 P.M.
Some lanes on northbound Hwy. 169 are periodically closing as construction vehicles attempt to remove the mudslide that shut down the southbound lanes.
Highway 169 has been shut down southbound after a mudslide blocked the road, causing a huge back up in traffic.
The Minnesota Department of Transportation says the southbound highway is blocked south of St. Peter, a city which has already seen major flooding due to Wednesday's torrential rain.
Drivers heading south on Hwy. 169 are being advised to find an alternative route, suggesting Hwy. 22.
It comes after a significant storm system made its way into Minnesota, with reports of 3 inches of rain having already fallen in parts of the state.
Roads have been left flooded in St. Peter, with the National Weather Service warning that localized flooding will be possible in other Minnesota cities as the system makes its way through the southern half of the state.
The city of St. Peter says a number of cars have stalled out as they pass through flooded areas, with drivers advised not to drive through any standing water.