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

Download

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

Auto Refresh: OFF

Printable Image About this graph Tabular Data (UTC) Tabular Data (CST) 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: Forecasts for the Blanco River at Wimberley are issued routinely year-round.

Default Hydrograph Scale to Flood Categories   Return to Area Map

Upstream Gauge

Downstream Gauge

Flood Categories (in feet) Major Flood Stage: 26 Moderate Flood Stage: 17 Flood Stage: 13 Action Stage: 10 Low Stage (in feet): -9999 Historic Crests (1) 44.90 ft on 05/24/2015 (2) 33.30 ft on 05/28/1929 (3) 28.89 ft on 11/16/2001 (4) 28.50 ft on 10/17/1998 (5) 26.75 ft on 10/31/2013 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 14.57 ft on 05/09/2019 (2) 26.54 ft on 10/30/2015 (3) 44.90 ft on 05/24/2015 (4) 26.75 ft on 10/31/2013 (5) 20.79 ft on 03/12/2007 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
38	The Highway 12 bridge becomes overtopped and is impassable. Disastrous life threatening flooding will flood hundreds of homes and businesses in and near Wimberley in the Blanco River and Cypress Creek flood plains. Many homes flood severely downstream in the lower Blanco and San Marcos River flood plains near San Marcos. This level will reach lower rural homes in the flood plain above Blanco to below San Marcos and can trap and drown hundreds of livestock. Roads near the river are extremely dangerous.
35	Flood waters reach the base of the bridge on Highway 12.
31	Disastrous life threatening flooding will flood over a hundred homes and businesses in and near Wimberley in the Blanco River and Cypress Creek flood plains. Many homes flood severely downstream in the lower Blanco and San Marcos River flood plains near San Marcos. This level will reach lower rural homes in the flood plain above Blanco to below San Marcos and can trap and drown hundreds of livestock. Roads near the river are extremely dangerous.
29	Many lowest homes in the Blanco River flood plain near Wimberley flood. Lowest homes and businesses in the Cypress Creek flood plain flood by backwater from the Blanco River and any runoff down Cypress Creek. Lowland flooding downstream in the lower Blanco and San Marcos Rivers severely floods lowest homes, roads and bridges near San Marcos. Livestock in the Blanco River flood plain above Blanco to the San Marcos River confluence are cut off and potentially drowned.
26	Major flooding impacts several lowest homes on the Blanco River near Wimberley. Homes along Cypress Creek near Wimberley also are threatened by the Blanco River backwater and any flow down Cypress Creek. Major flooding of the lower Blanco River in northeast San Marcos floods lowest homes and inundates roads and low bridges with several feet of water near the river making them extremely dangerous. Livestock are cut off and potentially drowned.
25	Flow approaches lowest homes near Wimberley. Widespread lowland flooding can cut off low areas of the flood plain drowning livestock. Homes along Cypress Creek near Wimberley are threatened. As the Blanco River backs up Cypress Creek additional runoff down Cypress Creek can easily flood homes. Roads near the lower Blanco River in northeast San Marcos flood severely. Water approaches the lowest homes in that area. Livestock are cut off and potentially drowned.
21	Water recreation is very dangerous above Blanco to the San Marcos River confluence, including John Knox Camp and Dudley Johnson Park at Five Mile Dam above San Marcos. Secondary roads and bridges in the flood plain are very dangerous to motorists. Hydraulic jumps behind low dams are dangerous to canoeists and kayakers as they may become trapped.
17	Water recreation in the Blanco river is dangerous from above Blanco to the San Marcos river confluence. Secondary roads and bridges in the flood plain are flooded and dangerous. Much of Dudley Johnson park at Five Mile Dam is flooded.
13	Minor lowland flooding reaches secondary roads. Low bridges and crossings from the headwaters to the San Marcos River confluence near San Marcos flood and are dangerous. Property in low lying areas of the Blanco and San Marcos Rivers should be moved to higher ground. Swimming and tubing are life threatening due to turbulence. Hydraulic jumps behind low water dams can trap canoeists and kayakers between the dam and the hydraulic jump and can be life threatening.
10	A fast moving rise down the Blanco River can make swimming and canoeing dangerous above Blanco to below San Marcos. Especially in areas where steep banks make getting out of the river dangerous. Low dams create hydraulic jumps which can trap canoeists and kayakers between the dam and the jump.
7	Overbank conditions begin to threaten swimmers and tubers in recreation areas above Blanco to the San Marcos River confluence below San Marcos.
6	Low lying areas and crossings of secondary roads flood near and below Blanco to below Wimberley including Farm to Market 178 just above Wimberley.

About This Location

Latitude: 29.994167° N, Longitude: 98.088611° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 13 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 29 797.23 ft 810.23 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 Wimberley

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