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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 (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: Graphical forecasts are not available for the Shoal Creek at West 12th Street. During times of high water, forecast crest information can be found in the text products.

Default Hydrograph Scale to Flood Categories   Return to Area Map

Flood Categories (in feet) Major Flood Stage: 12 Moderate Flood Stage: 10 Flood Stage: 7 Action Stage: 5 Low Stage (in feet): -9999 Historic Crests (1) 23.11 ft on 05/24/1981 (2) 20.76 ft on 05/25/2015 (3) 18.14 ft on 12/20/1991 (4) 16.37 ft on 08/22/2022 (5) 16.06 ft on 10/30/2015 (P) Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 16.37 ft on 08/22/2022 (2) 16.06 ft on 10/30/2015 (P) (3) 20.76 ft on 05/25/2015 (4) 10.15 ft on 05/17/2015 (5) 14.22 ft on 05/06/2015 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

If you notice any errors in the below information, please contact our Webmaster
23	Disastrous, life threatening flooding reaches the level of the May 24, 1981 flood. Homes in the flood plain will be destroyed from the headwaters of Shoal Creek to Lady Bird Lake. Businesses will be disastrously flooded along Lamar Boulevard below W 12th Street. Travel near shoal creek should be avoided.
21	Disastrous flooding approaches the level of the May 24, 1981 flood. Many businesses along Lamar Boulevard below 12th St have several feet of water in them. Homes are flooded from above Anderson Street to Lady Bird Lake. There should not be auto traffic near Shoal Creek.
19.5	Life threatening flooding inundates the West 12th Street bridge floor. Shoal Creek exceeds its channel above W 12th Street, producing disastrous business flooding along Lamar Boulevard. Numerous streets and bridges are extremely dangerous. Widespread residential flooding occurs from the Shoal Creek headwaters downstream to Lady Bird Lake.
18	Major flooding severely damages many businesses below W 12th Street along Lamar Boulevard. Shoal Creek is near going over the right bank at the Lamar Boulevard bridge near W 12th St, and nearing the 12th Street bridge floor. Numerous streets and bridges along Shoal Creek are severely flooded and dangerous to motorists. Several homes are flooded from the Shoal Creek headwaters to Lady Bird Lake.
16	Several businesses along Lamar Boulevard to below West 12th Street flood. Flow reaches the low steel of the 12th Street Bridge. Much of Pease Park above 12th Street is flooded. Lowest streets and bridges are severely flooded and dangerous to motorists.
14	Major flooding reaches lowest businesses near W 6th Street and Lamar Boulevard. Much of the lowest areas of Pease Park are flooded. Lowest streets in the flood plain are inundated.
12	Major lowland flooding is threatening businesses along Lamar Boulevard below West 12th Street. Much of Pease Park above 12th Street is flooded as well as low areas of the flood plain from the headwaters to Lady Bird Lake.
10	Moderate lowland flooding reaches lowest areas of Pease Park. Flow is threatening low bridges and significantly into the flood plain.
9	Lowest areas of Pease Park above W 12th Street flood.
7	Minor lowland flooding begins to enter lowest areas of Pease Park just upstream of W 12th Street.
5	Flow exceeds lowest banks.

About This Location

Latitude: 30.276389° N, Longitude: 97.750000° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 7 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 29 455.33 462.33 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 West 12th Street

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