Thu Jan 10, 2013 5:24pm EST

n">(Reuters) - A storm moving up the Mississippi River valley will help replenish the river, low in parts from drought, and ease concerns that shipping could be halted along a shallow stretch from St. Louis to Cairo, Illinois.

Shipping groups had warned as recently as last week of an effective closure of the river along that busy stretch, through which billions of dollars of grain, coal, fertilizer and other commodities flow every year.

Rain and the brisk pace of efforts to remove underwater rock could help the Army Corps of Engineers keep barge traffic flowing through that section of the Mississippi until at least mid-February when the river's water level rises because of seasonal changes.

The U.S. Coast Guard on Thursday relaxed their previously rigid draft restrictions for vessels transiting the area in response to the improved river forecast.

Boats had been required to have a draft of, at most, nine feet between the water's surface and the lowest point of the vessel. Now, while still recommending nine-foot drafts, the Coast Guard will allow deeper-draft boats if conditions allow.

Most barge tow boats require a draft of at least nine feet.

"The forecasts are looking good," said Lt. Colin Fogarty, public affairs officer for the Coast Guard's upper Mississippi River sector that covers the Cairo area and northward.

Shippers are still watching river gauges along the waterway to make sure they can transit low water areas.

"It doesn't look like we're going to hit those two thresholds of a minus-six feet in St. Louis and plus-two feet in Thebes," Fogarty said on Thursday, referring to low river gauge readings at the two locations that would prompt the Coast Guard to restrict vessel drafts to less than nine feet.

Gauge readings do not reflect the actual depth of the river at a certain location because the gauges are fixed and the river's bottom steadily changes with the current. They aid navigation as a shorter term reference point.

The river gauge at St. Louis was expected to rise from -2.8 feet on Thursday to -1 foot by Sunday, according to the National Weather Service.

At Thebes, Illinois, where the Army Corps has been removing rock pinnacles since mid-December, the gauge was at 3.8 feet on Thursday and expected to rise to 8.2 feet by Tuesday.

Rock clearing at Thebes and another location near Grand Tower, Illinois, was expected to be completed by the end of January, allowing for two additional feet of draft.

The prioritized removal of the most threatening pinnacles at Thebes is expected to be completed later this week, a Corps spokesman said late on Wednesday.

"Basically, the crisis is over. No, we can't run the 12-foot drafts that we would like to run out of St. Louis with 14-foot barges, but we'll have enough water that barges can continue to move," a grain barge trader said.

(Reporting by Karl Plume in Chicago; Editing by Toni Reinhold)

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CHICAGO | Wed Dec 26, 2012 7:55pm EST

CHICAGO (Reuters) - Commerce on a key stretch of the Mississippi River could "come to an effective halt" earlier than expected next week due to low water levels, disrupting shipments of billions of dollars of grain and other goods, a group of shippers said on Wednesday.

The Waterways Council, which represents shippers and receivers of commodities, said in a message to its members that it received an advisory from the U.S. Army Corps of Engineers on Monday that indicated water levels around Thebes, Ill., could be too low for most vessels to operate by January 3 or 4.

A spokesman for the Army Corps did not immediately return a call for comment about the forecast.

Shippers for months have been watching the stretch of the Mississippi River between St. Louis and Cairo, Ill., which includes Thebes, due to concerns about a potential closure.

A shipping superhighway that carries billions of dollars in grain, coal, steel and other commodities every year from the central United States to the Gulf of Mexico, the Mississippi is near record-low levels due to the worst U.S. drought since 1956.

"Water levels are falling quicker than we anticipated," Ann McCulloch, spokeswoman for the American Waterways Operators, a sister organization to the Waterways Council, said in an interview. "We were hoping not to reach this point until mid January."

The Waterways Council did not specify how long the river could be effectively closed.

Shippers have said previously that rain is needed to replenish water levels to keep the river open.

Recent snowfall in the central United States should help increase water levels on the lower Mississippi River, said Army Corps spokesman Mike Petersen earlier on Wednesday. However, "we would need a lot more" precipitation to see a significant improvement on key stretches of the middle Mississippi near Thebes, he said.

The Mississippi River is the main shipping waterway for grain moving from Midwest farms to export facilities at the Gulf of Mexico. Some 55 to 65 percent of U.S. corn, soybean and wheat shipments exit the country via the Gulf.

Exporters stepped up shipments of grain and soybeans to the Gulf Coast before water levels fell to critically low levels, forcing barges to take on lighter loads. They also resorted to loading more of their goods on rail cars.

The disruption of river traffic due to low water has pushed up export prices for grain, especially soybeans that are in strong demand from buyers like China.

ORDERS CANCELED, ORDERS CURTAILED

The latest forecast calls for the Mississippi River gauge at Thebes, to be at 3 feet on or around January 3-4, with vessel drafts limited to 8 feet, according the Waterways Council. The majority of vessels require a 9-foot draft to operate.

The draft is the distance from the surface of the water to a boat's lowest point.

"Our members have been preparing (for an effective closure) by investigating other options to move their products, either by rail or truck," said Debra Colbert, senior vice president for the council. "We've seen orders canceled; we've seen orders curtailed. We've seen companies looking at potential layoffs."

The Army Corps last week began clearing rocks from a shallow stretch of the drought-hit river near Thebes to maintain the flow of goods to Gulf Coast ports.

The low water level on the Mississippi River after this year's devastating dry spell was exacerbated by the Corps' decision to reduce by even more than usual the amount of water that flows into the waterway from the Missouri River. The Corps reduces the Missouri River flow every autumn.

The move raised protests from Midwestern governors and senators who urged President Barack Obama to rescind the decision for fear that badly needed income would be lost through the disruption of commerce that flows through the river.

The river groups met last week with White House staff "and continue to implore them and members of Congress and the Corps to release additional water to sustain navigation on the Mississippi River," the Council said.

(Reporting By Tom Polansek; Editing by Diane Craft)

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