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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: Not Available 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 Olmos Creek at Dresden Drive. During times of high water, forecast crest information can be found in the text products.

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Flood Categories (in feet) Major Flood Stage: 12 Moderate Flood Stage: 10 Flood Stage: 9 Action Stage: 9 Low Stage (in feet): -9999 Historic Crests (1) 14.82 ft on 09/13/1978 (2) 14.38 ft on 04/05/1991 (3) 14.01 ft on 10/17/1998 (4) 13.20 ft on 05/07/1972 (5) 12.97 ft on 07/01/2002 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 9.28 ft on 06/03/2016 (2) 9.31 ft on 04/25/2015 (3) 12.78 ft on 05/25/2013 (4) 10.57 ft on 11/22/2004 (5) 12.97 ft on 07/01/2002 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
14	The reservoir behind Olmos dam fills up and causes long lasting travel impacts near the Quarry Market, including the closure of Highway 281. Major residential flooding occurs in the headwaters of Olmos Creek above Loop 410. Over a foot of water is in lowest businesses in the southwest quadrant of Loop 410 and West Avenue. Many streets and low water crossings will have several feet of turbulent flow over them.
13	The reservoir behind Olmos dam fills up and causes long lasting travel impacts near the Quarry Market, including the closure of Highway 281. Several businesses in the southwest quadrant of Loop 410 and West Avenue flood up to a foot.
12	The reservoir behind Olmos dam fills up and causes long lasting travel impacts near the Quarry Market, including the closure of Highway 281. Major flooding approaches slabs of the lowest businesses in the southwest quadrant of Loop 410 and West Avenue cutting off some areas.
10	Moderate lowland flooding approaches businesses in the southwest quadrant of Loop 410 and West Avenue. Low bridges and crossings upstream near Lockhill-Selma are very dangerous to traffic.
9	Minor lowland flooding extends into low areas of the flood plain with no significant damage.

About This Location

Latitude: 29.498889° N, Longitude: 98.510000° 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 29 726.1 ft 735.1 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 Dresden Drive

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