Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS), with a target of Spring 2024. Existing AHPS content and features will be preserved and expanded within NWPS. The NWS is now accepting feedback on NWPS. Please visit https://www.weather.gov/owp/operations for more information.

Experimental National Water Center Products: Flood Inundation Mapping services are now available for 10% of the U.S. population. Please visit https://www.weather.gov/owp/operations for more information. The National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via the URL above, as described in the StoryMap here.

Weather Forecast Office Austin/San Antonio, TX

West Gulf River Forecast Center

Hydrograph

River at a Glance

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Printable Image About this graph Tabular Data (UTC) Tabular Data (CST) Datum: NAVD88 Metadata

NOTE: River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time. NOTE: Forecasts are not available for the Onion Creek near Driftwood. Only observed stages are available for this point.

Default Hydrograph Scale to Flood Categories   Return to Area Map

Downstream Gauge

Flood Categories (in feet) Major Flood Stage: 13 Moderate Flood Stage: 7 Flood Stage: 5.5 Action Stage: 5.5 Low Stage (in feet): -9999 Historic Crests (1) 26.39 ft on 10/30/2015 (2) 26.30 ft on 05/04/2019 (3) 25.10 ft on 10/17/1998 (4) 21.56 ft on 05/24/2015 (5) 21.07 ft on 10/31/2013 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 17.00 ft on 05/08/2019 (2) 26.30 ft on 05/04/2019 (3) 26.39 ft on 10/30/2015 (4) 10.89 ft on 05/26/2015 (5) 21.56 ft on 05/24/2015 Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records Currently none available. For more information on your flood risk go to www.floodsmart.gov. Show FEMA's National Flood Hazard Layers FEMA's National Flood Hazard Layers not showing? Why aren't the FEMA National Flood Hazard Layers showing on the ESRI Map? Possible reasons: There are no FEMA National Flood Hazard Layers for the location which you are viewing on ESRI Maps. The FEMA Web Mapping Service (WMS) is down. Note: Your zoom level may have changed. ESRI's zoom levels must be between 14 and 16 to show National Flood Hazard layers.

Zoom Level:16 Legend FEMA Layer Gauge Location Disclaimer Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.

Flood Impacts & Photos

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25	Major flooding is near the USGS survey 1:25 year level. Homes in a mobile home park downstream above William Cannon Drive in Austin will flood. Roads and bridges are severely flooded and very dangerous from the headwaters to the Colorado River.
23	Major flooding makes roads and bridges very dangerous to auto traffic. A mobile home park downstream above William Cannon Drive in Austin will be threatened. Livestock should be moved from vulnerable areas of the flood plain.
20.5	Major flooding is near the USGS survey 1:10 year level. Livestock are threatened in the flood plain. Roads and bridges are severely flooded and very dangerous from the headwaters to the Colorado River. A mobile home park downstream above William Cannon Drive in Austin will be threatened.
18	Major flooding is well into the flood plain. Roads and bridges from the headwaters to the Colorado River in Austin are severely flooded and very dangerous. The two Ranch to Market Rd 150 crossings are under 13 feet of water.
15	Major flooding is near the USGS survey 1:5 year level. Flow is ten feet over the two Ranch to Market Rd 150 crossings and well into the flood plain, threatening livestock. Roads and low bridges are flooded and dangerous from the headwaters to the Colorado River.
13	Major flooding cuts off livestock in the flood plain from the headwaters to above I-35. Flow is eight feet over the two Ranch to Market Rd 150 crossings. Widespread severe flooding of secondary and primary roads and bridges makes driving very hazardous.
10	Moderate lowland flooding is five feet over the two Ranch to Market Rd 150 crossings and well into the flood plain.
8.6	Moderate flooding reaches the USGS survey 1:2 year flood level. Flow is three feet over the two Ranch to Market Rd 150 crossings.
7	Moderate lowland flooding makes secondary roads, low bridges and low water crossings very dangerous. The two Ranch to Market Rd 150 crossings may be under several feet of fast flowing water.
5.5	Minor flooding makes several secondary roads dangerous, including the two Ranch to Market Rd 150 crossings over Onion Creek.

About This Location

Latitude: 30.082778° N, Longitude: 98.007500° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 5.5 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps Vertical Datum Elevation (gauge height = 0) Elevation (gauge height = flood stage) Elevation information source NAVD88 868.52 874.02 Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks Other Not Available Not Available   Current/Historical Observations: U.S. Geological Survey (USGS) Data and Site Info for Driftwood

Resources

Hydrologic Resources Text Products Past Precipitation Forecast Precipitation River Forecast Centers River Stage Summary Rainfall Frequency Atlas Maps Weather Prediction Center Inundation Mapping Locations

Additional Resources Area Hydrographs NWS Precipitation and River Forecasting AHPS Iframes for Developers Mobile iNWS for emergency management West Gulf River Forecast Center Lower Colorado River Authority Guadalupe Blanco River Authority San Antonio River Authority Edwards Aquifer Authority Nueces River Authority International Boundary and Water Commission Snow Information

Collaborative Agencies The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here. NWS Information National Weather Service Austin/San Antonio Weather Forecast Office 2090 Airport Road New Braunfels, TX 78130 (830) 629-0130 Ask Questions/Webmaster Page last modified: 2-Nov-2020 7:29 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities