The A4034 Bromford Road, in Oldbury, was closed in both directions from Fountain Lane to Kelvin Way under the bridge near Sandwell and Dudley Railway Station after the main burst around 10:30am on Thursday(7).
It meant that buses were diverted from the scene as the road became badly flooded, with NX West Midlands bus services 3, 3A, 4, 4H and 4M being diverted via Brandon Way, Albion Road, Oldbury Road, West Bromwich Street and Fountain Lane.
It also meant that surrounding roads were left heavily congested as drivers looked to find alternative routes as South Staffs Water worked to repair the damage.
A spokesman for West Midlands Roads said: "The A4034 Bromford Road in Oldbury outside of Sandwell and Dudley Station is closed due to a burst water main.
"NX West Midlands bus services 3, 3A, 4, 4H and 4M are diverting via Brandon Way, Albion Road, Oldbury Road, West Bromwich Street and Fountain Lane."
A spokesman for NX West Midlands said: "There is service disruption due to flooding near Sandwell and Dudley station as Bromford Road is closed.
"Services 3, 3A, 4 ,4H and 4M are diverted via Brandon Way, Albion Road, West Bromwich Street and Fountain Lane in both directions.
"Apologies for any inconvenience caused."
Nathan Harper, head of network operations at South Staffs Water, said: ‘We’ve been responding to a large burst in Broadwell Road, Oldbury, which required additional support from the fire service.
"Although the water main has been repaired, Broadwell Road remains closed, as we work to repair the road surface.
"We’re working hard to reopen Broadwell Road as soon as possible.
"We would like to thank the fire service and police for their support and also our customers, residents, and motorists for their continued patience."