The current floodplain maps for Onion Creek are based on data from the 1980s. The floodplain study updates the data for more accurate floodplain maps.
Floodplain Maps – Appeal and Comments
There is a 90-day public appeal and comment period for the preliminary FEMA floodplain maps for Onion, Bear, Little Bear and Rinard Creeks and some other tributaries. Comments are intended to correct small issues such as mislabeled streets on the maps. Appeals must be about the preliminary floodplain maps and based on engineering analysis. Appeals and comments are due by April 18, 2018.
To view pdfs of the preliminary maps or for more information about how to make an appeal or comment, visit our Appeal and Comment web page. There is also an interactive map farther down this page that has general information about where the floodplain has changed.
Onion Creek is Austin’s largest watershed. In fact, most of the watershed is outside of Austin in Hays County. The floodplain study focuses on the part of Onion Creek within Austin and Travis County. It also looks at three of the creeks that feed Onion Creek: Bear, Little Bear and Rinard.