Levees at Columbia Lakes in Brazoria County have been breached, according to the official Brazoria County website.
FLASH FLOOD WARNING western Brazoria county until 5:45 PM. Brazos levee at Columbia Lakes has breached. All residents urged to evacuate now pic.twitter.com/7MZRyL3M3x— FOX26Houston (@Fox26Houston) August 29, 2017
"Get out now," the alert reads.
Portions of Brazoria County, due south of Houston, had been under a mandatory evacuation notice since Sunday.