Barge traffic on U.S. Midwest rivers continued slow as low water levels on the upper and lower Mississippi River and ice buildup on the Illinois River kept navigation treacherous, Reuters reported on Wednesday. "At the Memphis gauge, the water level is about three feet below the desired level," said Lt. Brian Meier, U.S. Coast Guard spokesman, Memphis office. "The forecast is for water levels to stay pretty steady for next couple days," he said. Low water levels and a barge grounding about 30 miles south of Memphis this week caused river officials to issue a travel advisory from Cairo, Illinois, to Vicksburg, Mississippi. Southbound tows were limited to 30 barges and northbound tows limited to 36 barges with a 10-foot draft or less. In the St.