Water Main Break Shuts Down Cass Avenue

Crews work to shut off water and close surrounding streets after a large feeder main broke overnight.

Apr. 17, 2026 at 11:09am

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A sweeping, atmospheric landscape painting in muted blues and grays, depicting a flooded city street obscured by heavy fog, with only the faint outlines of buildings and streetlights visible in the distance, conveying the overwhelming scale and power of the natural disaster.A powerful storm system overwhelms the urban landscape, exposing the vulnerability of aging infrastructure to the forces of nature.St. Louis Today

A 30-inch water main has broken in downtown St. Louis, causing Cass Avenue to be shut down at Tucker Boulevard as water pools on the road. Crews have been on the scene since 10 p.m. Thursday working to shut off the water and close surrounding streets from 8th to 12th Streets.

Why it matters

Water main breaks can cause significant disruption to traffic and infrastructure in urban areas, potentially leading to road closures, property damage, and service outages. This particular break on a major thoroughfare like Cass Avenue will likely impact commuters and businesses in the area until repairs are completed.

The details

According to a worker on the scene, the 30-inch feeder main broke sometime Thursday night, causing water to start pooling on Cass Avenue at the intersection with Tucker Boulevard. Crews have been working since 10 p.m. to shut off the water supply and close down Cass Avenue as well as the surrounding streets from 8th to 12th Streets.

  • The water main broke sometime Thursday night.
  • Crews have been on the scene since 10 p.m. Thursday.

The players

First Alert 4

A local news station that reported on the water main break.

Cass Avenue

A major thoroughfare in downtown St. Louis that has been shut down due to the water main break.

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What’s next

Crews will continue working to shut off the water supply and assess the damage in order to begin repairs on the broken 30-inch feeder main. The surrounding streets are expected to remain closed until the work is completed.

The takeaway

This water main break on a key downtown street highlights the aging infrastructure challenges many cities face, and the potential for significant disruptions when critical systems fail. Maintaining and upgrading water, sewer, and transportation networks is an ongoing priority for urban planners and public works departments.