Customers in the area can expect to experience lower-than-normal or, in some cases, no water pressure temporarily.
Officials expect repairs to the water main to be completed by 4 a.m.
A portion of the westbound lanes of NW Expressway are closed while crews work to repair the main. Vehicles will be unable to travel westbound on NW Expressway from Classen Boulevard until repairs are completed.
Lane closures will remain in place overnight and into tomorrow. Currently, the timeline for opening the NW Expressway lane closures is unknown.
The cause of the main break has not been determined.