 A sea lock, known as Mutford Lock, divides fresh from seawater and links Oulton Broad with Lake Lothing and the North Sea.This lock is operated by Sentinel Enterprises Limited and will allow traffic to pass through.At Somerleyton the Lowestoft to Norwich railway line crosses the Waveney on a swing bridge, while at St Olaves, the Haddiscoe Cut branches off left to connect the Rivers Yare and Waveney.