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 was 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 and appeals were due by April 18, 2018.
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.