Situated about 1 mile to the north of where the River Shannon enters Lough Derg, Portumna Bridge must be opened to allow craft with more than 4 ft of air draft to pass by. The bridge is opened only at fixed times. There are quays both north and south of the bridge where craft may tie up while they wait for the bridge to open and there are mid-stream pontoons both upstream and downstream of the bridge.
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