<p>Barge industry officials call it a silent but growing problem. Aging infrastructure, including locks and dams on the upper Ohio River, are quietly choking the flow of goods in and out of the region.</p>
<p>The problem was demonstrated in early July, when delays caused by routine repairs on the Montgomery lock had barge operators waiting as long as three days to move gas, coal, iron ore and other products in and out of the port of Pittsburgh. One barge company operator estimated the delays were costing the region more than $100,000 a day.</p>