Advanced Hydrologic Prediction Service: Austin/San Antonio: Colorado River above La Grange
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Advanced Hydrologic Prediction Service

Colorado River above La Grange, TX (LGRT2)

Data Type




Inundation Levels
NAVD88

258.748.5
257.747.5
256.746.5
255.745.5
254.744.5
253.743.5
252.742.5
251.741.5
250.740.5
249.739.5
248.738.5
247.737.5

Major Flooding Begins

246.736.5
245.735.5
244.734.5
243.733.5
242.732.5

Moderate Flooding Begins

241.731.5
240.730.5
239.729.5
238.728.5
237.727.5
236.726.5

Flooding Begins

235.725.5
234.724.5


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

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Current Stage: 10.14 ft at 18:00 UTC 02/09
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NAVD88: 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:37
Moderate Flood Stage:32
Flood Stage:26
Action Stage:19
Below Flood Stage:

USGS Gauge Location USGS Gauge Location

Extent of Inundation Study Boundaries Extent of Inundation Study Boundaries

Historical Crests
(1) 56.70 ft on 07/09/1869
(2) 56.40 ft on 12/05/1913
(3) 50.84 ft on 06/17/1935
(4) 45.50 ft on 10/20/1998
(5) 43.32 ft on 12/23/1991
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Impacts Collapse
45.0 MAJOR FLOODING WITH WATER TO THE ROOFS OF LOWEST HOMES IN THE FRISCH AUF COMMUNITY. NUMEROUS MOBILE HOMES FLOOD SEVERELY. LIVESTOCK IN THE FLOOD PLAIN ABOVE SMITHVILLE TO BELOW COLUMBUS ARE VULNERABLE TO DROWNING. ROADS AND BRIDGES IN THE FLOOD PLAIN ARE SEVERELY FLOODED AND DANGEROUS. RIVER IS TO THE LEVEL OF 2ND BANK AND THREATENS HOMES AND BUSINESSES IN LAGRANGE
43.0 DISASTROUS FLOODING OF THE COLORADO RIVER DAMAGES SEVERAL MOBILE HOMES IN LAGRANGE AND FIVE PERMANENT HOMES IN THE FRITSCH AUF SUBDIVISION ARE FLOODED UP TO SIX TO SEVEN FEET. SEVERELY FLOODED ROADS AND BRIDGES NEAR THE RIVER MAKE TRAVEL AND EVACUATIONS DANGEROUS
40.0 THE LOWEST SITES OF A TRAILER PARK IN LAGRANGE IN THE NORTHWEST QUADRANT OF HIGHWAY 71 AND THE COLORADO RIVER ARE THREATENED. LOWEST HOMES IN THE FRITSCH AUF COMMUNITY HAVE SEVERAL FEET OF WATER IN THEM. SEVERELY FLOODED ROADS AND BRIDGES NEAR THE RIVER MAKE TRAVEL AND EVACUATIONS DANGEROUS
37.0 MAJOR FLOODING OF THE COLORADO RIVER REACHES LOWEST HOMES IN THE FRITSCH AUF SUBDIVISION ON THE SOUTH BANK OF THE COLORADO RIVER IN LAGRANGE. SEVERELY FLOODED ROADS AND BRIDGES NEAR THE RIVER MAKE TRAVEL AND EVACUATIONS VERY DANGEROUS
36.0 THE LOWEST PART OF THE ROAD INTO THE FRITSCH AUF SUBDIVISION JUST SOUTH OF THE COLORADO RIVER SOUTH OF DOWNTOWN FLOODS. THE COLORADO RIVER APPROACHES LOWEST HOMES IN THE FRITSCH AUF SUBDIVISION AND ADDITIONAL FLOW DOWN BUCKNERS CREEK WILL FLOOD THEM
32.0 MODERATE LOWLAND FLOODING REACHES THE FLOOD PLAIN NEAR LAGRANGE. HOMES IN THE FRITSCH AUF SUBDIVISION ON THE SOUTH BANK OF THE COLORADO RIVER MAY BE THREATENED IF HEAVY RUNOFF DOWN BUCKNERS CREEK ADDS TO THE COLORADO RIVER FLOW AT THIS LEVEL
29.0 FLOW COVERS LOWEST AREAS OF THE FLOOD PLAIN WITH NO MAJOR DAMAGE. LOWEST ROADS AND BRIDGES ARE FLOODED
26.0 MINOR LOWLAND FLOODING COVERS LOW AREAS OF THE FLOOD PLAIN WITH NO SIGNIFICANT DAMAGE. LOWEST ROADS AND BRIDGES ARE FLOODED
23.0 FLOW EXCEEDS THE LOW BANKS INTO LOWEST AREAS OF THE FLOOD PLAIN WITH NO DAMAGE. LOWEST ROADS AND BRIDGES ARE FLOODED
19.0 FLOW EXCEEDS LOWEST SECTIONS OF THE BANKS

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

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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.

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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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