MARYLAND HEIGHTS, Mo. – Crews are on the scene as a major water main break occurred in Maryland Heights early Friday morning.

Authorities say they received a phone call about the break before 4 a.m. as a lot of water was gushing out from the break site at McKelvey Road and Roth Hill Drive . Missouri American Water crews are on the scene, saying they believe a 20-inch main broke and will require significant repairs.

Traffic is being detoured due to pavement damage to McKelvey Road in the area and a stretch of McKelvey is shut down in both directions. Dorsett Road is still open.

Crews have the water shut down here so they can get a better idea of what they’re dealing with and repairs can begin. Those crews have been out at the scene for hours, getting all of the valves shut off to stem the water flow.

Maryland Heights police have had to stop some vehicles from driving over the area where the break happened, including, at one point, a bi-state bus.

Crews expect the roadway to be shut down for several hours as they make repairs. Water service will impact many people in the area. No injuries have been reported.