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
A top Army Corps of Engineers official says she believes the low Mississippi River will remain open to shipping, partly justifying the agency's decision to not release more water from the Missouri River into the Mississippi.
Army Assistant Secretary Jo-Ellen Darcy, in a Thursday letter obtained by The Associated Press, tells lawmakers from Mississippi River states that the agency won't be scaling back the amount of Missouri River water it began withholding last month from the Mississippi.
Businesses that work and ship on the Mississippi River are seeking a presidential declaration keep water flowing out of reservoirs on the Missouri River.
The U.S. Army Corps of Engineers closes dams in South Dakota at this time every year to store water to maintain levels later in the spring and summer.
The Missouri River accounts for roughly 60 percent of the water flowing by St. Louis. In a drought-year like this year, George Foster of St. Louis’ J.B. Marine says reducing river levels would risk closing the shipping channel.
Missouri Gov. Jay Nixon and the barge industry are imploring the federal government to keep water flowing on the Missouri and Mississippi rivers or face potential "economic disaster."
The drought has left many waterways at historic lows. Nixon sent a letter Friday urging the Army Corps of Engineers to rethink plans to reduce the amount of water released from the Missouri's upstream reservoir. That would also reduce flow on the Mississippi below St. Louis.
Federal lawmakers from several states along the Mississippi River are pressing to modernize the waterway's locks-and-dams system, which they say desperately needs repair.
Sens. Dick Durbin and Mark Kirk of Illinois, Claire McCaskill and Roy Blunt from Missouri, and Tom Harkin and Chuck Grassley from Iowa are pressing the Environmental and Public Works Committee to ensure funding to hasten what they term critical improvements.