Which river flows through Northwich before joining the Mersey west of Runcorn?
Runcorn the River Mersey, which flows to the north and then to the west of the town. On the north bank of the river is another spur forming the West Bank area of Widnes; together these form Runcorn Gap, a narrowing of the River Mersey. Runcorn Gap is crossed by three bridges: Runcorn Railway Bridge (which carries the Liverpool branch of the West Coast Main Line), the Silver Jubilee Bridge and the Mersey Gateway which carries the A533. To the south of the town is the River Weaver and the Weston Canal. Both open into the Manchester Ship Canal. To the
River Mersey the canal and maintaining the canal's water levels. After the river exits the canal, flowing towards Warrington where the river widens. It then narrows as it passes between the towns of Runcorn and Widnes. From Runcorn the river widens into a large estuary, which is across at its widest point near Ellesmere Port. The course of the river then turns north as the estuary narrows between Liverpool and Birkenhead on the Wirral Peninsula to the west, and empties into Liverpool Bay. In total the river flows . A railway tunnel between Birkenhead and Liverpool as part of the Mersey Railway