The Brazos is one of Fort Bend County's big flood sources

The Brazos flows through Fort Bend County. Its drainage basin reaches far beyond the county line. Heavy rain and reservoir operations upstream can raise the river here. When water rises, the county watches gauges, local rain, and releases from upstream lakes.

Flood risk can change from one lot to the next. Distance from the river is one clue, not the whole answer. Check the effective FEMA map, ground height, nearby drains, local levee district, and the home's own flood history. A levee can lower some risk. It cannot remove all risk.