A storm system that's dropping snow on the western half of the state will bring up to four inches of rain to the St. Louis area by Sunday.
But don't expect much in the way of flash flooding, says National Weather Service hydrologist Mark Fuchs.
"We're not necessarily expecting flash flooding in the classic sense - where you see a very quick rising water coming down the stream," Fuchs said. "But with that being said, there will be some roads in poor drainage areas that could go underwater."
Credit via Flickr/TeamSaintLouis (Army Corps of Engineers)
"As the river levels drop river depth decreases and the river banks recede. As a result the fleeting areas (areas where barges are picked up and dropped off) move closer to the channel. This makes for tight quarters while vessels navigate the river."
Updated 2:10 p.m. with information about excavation and blasting.
Updated at 4:45 p.m. to include comments from Jody Farhat of the Corps of Engineers.
The amount of water flowing into the lower Missouri River will be increased this week because of concerns about colder temperatures, but the increase isn't likely to boost the level of the Mississippi River downstream.
An updated Mississippi River forecast is predicting that low-water levels will likely linger throughout the winter. The forecast exacerbates concerns that shipping may be impacted along a key stretch near St. Louis.
The latest outlook by National Weather Service Hydrologist Mark Fuchs shows that without significant rain, the river at St. Louis will likely fall to dangerously low levels by the end of December