Advanced Hydrologic Prediction Service: Austin/San Antonio: Colorado River at Austin
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Advanced Hydrologic Prediction Service

Colorado River at Austin, TX (ACRT2)

Data Type




Inundation Levels
NAVD88

435.633.0

Major Flooding Begins

434.632.0
433.631.0
432.630.0
431.629.0

Moderate Flooding Begins

430.628.0
429.627.0
428.626.0
427.625.0
426.624.0

Flooding Begins

425.623.0
424.622.0
423.621.0
422.620.0
421.619.0
420.618.0
419.617.0
418.616.0
417.615.0
416.614.0
415.613.0


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Weather Forecast Office Austin/San Antonio, TX West Gulf River Forecast Center

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Current Stage: 1.83 ft at 21:00 UTC 01/15
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NAVD88: N/A ft
Stage: N/A ft

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Graphical representation of flood inundation for NWS flood categories are based on steady state hydraulic modeling of water surface elevations for incremented discharges. Map shows approximate inundation areas for given water surface elevations and should not be used for navigation or permitting or other legal purposes, but strictly as a planning reference tool.

North Arrow Flood Categories (in feet)
Major Flood Stage:33
Moderate Flood Stage:29
Flood Stage:24
Action Stage:16
Below Flood Stage:

USGS Gauge Location USGS Gauge Location

Extent of Inundation Study Boundaries Extent of Inundation Study Boundaries

Historical Crests
(1) 51.00 ft on 07/07/1869
(2) 50.00 ft on 06/15/1935
(3) 45.20 ft on 07/25/1938
(4) 42.00 ft on 01/01/1970
(5) 31.40 ft on 09/28/1936
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Impacts Collapse
37.0 SEVERAL HOMES FLOOD IN THE COLORADO RIVER FLOOD PLAIN BELOW DEL VALLE TO BASTROP AND ALONG ONION CREEK ABOVE THE COLORADO RIVER CONFLUENCE ARE SEVERELY FLOODED. NUMEROUS STREETS AND ROADS ARE EXTREMELY DANGEROUS. MAJOR FLOODING EXTENDS WELL INTO THE FLOOD PLAIN DESTROYING EQUIPMENT AND LIVESTOCK
35.0 MAJOR FLOODING APPROACHES HOMES IN THE FLOOD PLAIN BELOW DEL VALLE TO BASTROP. EQUIPMENT AND LIVESTOCK SHOULD BE MOVED FROM THE FLOOD PLAIN TO BELOW BASTROP. SECONDARY AND PRIMARY ROADS AND BRIDGES ARE FLOODED SEVERELY AND VERY DANGEROUS TO MOTORISTS
33.0 MAJOR FLOODING APPROACHES THE LOWEST RESIDENCES ALONG THE COLORADO RIVER BELOW DEL VALLE. RESIDENCES IN THE LOWER REACH OF ONION CREEK ARE VULNERABLE TO FLOODING AS THE COLORADO RIVER BACKS UP THE CREEK AND ADDS TO RUNOFF DOWN ONION CREEK. LIVESTOCK AND EQUIPMENT SHOULD BE MOVED FROM THE FLOOD PLAIN BELOW AUSTIN TO BASTROP. LOWEST HOMES FLOOD NEAR WEBBERVILLE
31.0 LOWEST HOMES IN THE FLOOD PLAIN BELOW LONGHORN DAM TO ABOVE BASTROP FLOOD. LIVESTOCK AND EQUIPMENT SHOULD BE MOVED FROM LOW AREAS OF THE FLOOD PLAIN BELOW LAKE TRAVIS TO BELOW BASTROP. ROADS AND LOW BRIDGES IN THE FLOOD PLAIN FLOOD SEVERELY AND ARE DANGEROUS TO MOTORISTS
29.0 MODERATE FLOODING APPROACHES THE COLORADO RIVER RANCHETTES IN THE SOUTHWEST QUADRANT OF THE CONFLUENCE OF THE COLORADO RIVER AND DRY CREEK. LOWEST HOMES DOWNSTREAM BELOW AUSTIN FLOOD. LIVESTOCK SHOULD BE MOVED FROM VULNERABLE AREAS OF THE FLOOD PLAIN
27.0 SEVERAL HOMES ARE THREATENED AS THE COLORADO RIVER BACKS UP ONION CREEK. ANY ADDITIONAL FLOODING DOWN ONION CREEK MAY FLOOD HOMES NEAR THE CONFLUENCE WITH THE COLORADO RIVER. LIVESTOCK SHOULD BE MOVED FROM VULNERABLE AREAS OF THE FLOOD PLAIN BELOW AUSTIN. LOWEST HOMES BELOW AUSTIN FLOOD
26.0 LOWEST HOMES AND APARTMENTS NR THE COLORADO RIVER AND THE LOWER PART OF ONION CREEK ARE THREATENED. RESIDENTS SHOULD MONITOR NOAA WEATHER RADIO FOR DEVELOPING FLOOD WARNINGS. LIVESTOCK CAN BE CUT OFF IN LOW AREAS BELOW AUSTIN. LOWEST HOMES BELOW AUSTIN TO BASTROP FLOOD
24.0 MINOR LOWLAND FLOODING REACHES LOW AREAS OF THE FLOOD PLAIN. NO SIGNIFICANT DAMAGE OCCURS AT THIS LEVEL NEAR AUSTIN BUT LIVESTOCK SHOULD BE MOVED FROM LOWLYING AREAS DOWNSTREAM. LOWEST HOMES BELOW AUSTIN TO BASTROP ARE THREATENED
22.0 FLOW IS WELL INTO THE FLOOD PLAIN BELOW LAKE TRAVIS DOWNSTREAM. LIVESTOCK SHOULD BE MOVED FROM LOW AREAS OF THE FLOOD PLAIN DOWNSTREAM BELOW AUSTIN
20.0 FLOW IS IN LOWEST SECTIONS OF THE FLOOD PLAIN
18.0 FLOW IS IN LOWEST SECTIONS OF THE FLOOD PLAIN
16.0 FLOW EXCEEDS LOWEST SECTIONS OF THE BANKS

Other Data Sources:
U.S. Geological Survey (USGS) Data and Site Info for Austin

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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 Rd.
New Braunfels, TX 78130
(830) 606-3617
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Page last modified: 18-Sep-2008 4:37 PM
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