An official says that a levee protecting a subdivision of homes in a county south of Houston has been fortified after being breached but warns the threat is far from over.Brazoria County spokeswoman Sharon Trower said Tuesday afternoon that the levee had been fortified. Earlier in the day the county had posted on Twitter: "NOTICE: The levee at Columbia Lakes has been breached!! GET OUT NOW!!"She says that some water did get through but it wasn't substantial. She warns that authorities don't know how long the fortification will hold. She also notes the breach happened due to rainwater but that the nearby Brazos River continues to spill out of its banks.Trower says that the mandatory evacuation ordered Sunday morning still stands and notes that most of the residents in the area have left.Brazoria County Judge Matt Sebesta has said that there are hundreds of homes in the tree-lined subdivision situated around a golf course.