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 March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

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

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Hydrograph

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Inundation Mapping

Probability Information Weekly Chance of Exceeding Levels Chance of Exceeding Levels During Entire Period Short-term Probabilistic Guidance (Experimental)

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Printable Image About this graph Tabular Data (UTC) Tabular Data (CDT) Datum: NGVD29 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 for the San Gabriel River at Georgetown South Fork are issued as needed during times of high water, but are not routinely available.

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Upstream Gauge

Flood Categories (in feet) Major Flood Stage: 26 Moderate Flood Stage: 13 Flood Stage: 9 Action Stage: 5 Low Stage (in feet): -9999 Historic Crests (1) 41.00 ft on 04/24/1956 (2) 31.65 ft on 06/27/2007 (3) 27.06 ft on 11/15/2001 (4) 24.60 ft on 09/03/1981 (5) 23.93 ft on 09/22/2018 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 9.29 ft on 05/08/2019 (2) 23.93 ft on 09/22/2018 (3) 11.26 ft on 10/31/2015 (P) (4) 15.75 ft on 05/26/2015 (5) 17.12 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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26	Major lowland flooding closes many streets and roads. Much of the city park downstream floods. Lowest homes above Georgetown to Granger Lake are threatened.
23	Moderate lowland flooding inundates many secondary and primary roads near the San Gabriel River. Facilities and equipment well into the flood plain are flooded. Residents of lowest homes in the flood plain above Georgetown to Granger Lake should monitor NOAA Weather Radio for developing heavy rain and flood conditions.
20	Moderate lowland flooding closes secondary and primary roads near the river. The city park is severely flooded. Livestock and equipment should be moved from the flood plain from the headwaters to Granger Lake.
17	Moderate lowland flooding inundates many secondary and primary roads near the San Gabriel River from the headwaters of the South Fork to Granger Lake. The city park in Georgetown and any facilities and equipment in the flood plain are damaged.
13	Moderate lowland flooding inundates secondary roads and low bridges. Flow enters the lowest areas of the city park.
9	Minor lowland flooding reaches low areas of the flood plain with no significant damage. Lowest areas of the city park downtown are flooded.
5	Flow exceeds lowest sections of the banks.

About This Location

Latitude: 30.625556° N, Longitude: 97.690833° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 9 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 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps NGVD 29 687.72 ft 696.72 ft 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 Georgetown South Fork

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