An accident involving an 18-wheeler is causing quite a mess in Rosenberg.

Rosenberg police are working to clean up an accident involving an 18-wheeler at Spur 529 at the Southwest Freeway southbound.

The 18-wheeler was carrying sand, which spilled on the roadway.

Police said Spur 529 is closed, and the earliest it will open is 7 p.m.

Drivers are encouraged to use alternative routes.

No other vehicles were involved in this accident.