Advanced Hydrologic Prediction Service: Austin/San Antonio: Onion Creek at US 183
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Advanced Hydrologic Prediction Service

Onion Creek at US 183, TX (ATIT2)

Data Type




Inundation Levels
NAVD88

482.439.3
481.438.3
480.437.3
479.436.3
478.435.3
477.434.3
476.433.3
475.432.3
474.431.3
473.430.3
472.429.3
471.428.3
470.427.3
469.426.3
468.425.3
467.424.3

Major Flooding Begins

466.423.3
465.422.3
464.421.3
463.420.3

Moderate Flooding Begins

462.419.3
461.418.3
460.417.3

Flooding Begins

459.416.3
458.415.3


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

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Current Stage: 3.1 ft at 22:00 UTC 01/15
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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:24
Moderate Flood Stage:20
Flood Stage:17
Action Stage:15
Below Flood Stage:

USGS Gauge Location USGS Gauge Location

Extent of Inundation Study Boundaries Extent of Inundation Study Boundaries

Historical Crests
(1) 38.00 ft on 07/03/1869
(1) 38.00 ft on 09/09/1921
(3) 36.50 ft on 11/16/2001
(4) 32.00 ft on 10/17/1998
(5) 30.50 ft on 12/21/1991
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Impacts Collapse
54.0 HEIGHT OF INSTRUMENTS INSIDE GAUGE HOUSE
49.0 FLOOR OF BRIDGE NEAR CENTERLINE OF CREEK
40.0 FLOODS SHEDS AT COUNTY MAINTENANCE FACILITY RIGHT UPSTREAM FLOODS
30.0 LOWEST HOMES FLOOD ON THE LOWER END OF ONION CREEK AND NEAR THE COLORADO RIVER CONFLUENCE. MANY ROADS AND LOW BRIDGES NEAR THE RIVER ARE EXTREMELY DANGEROUS TO MOTORISTS AND TRAVEL NEAR THE CREEK SHOULD BE AVOIDED. MANY BLOCKS OF A MOBILE HOME PARK ABOVE WILLIAM CANNON DRIVE ARE FLOODED WITH WATER IN LOWEST HOMES
28.0 MAJOR FLOODING REACHES ABOUT TEN SQUARE BLOCKS OF A MOBILE HOME PARK ABOVE WILLIAM CANNON DRIVE. MANY ROADS AND LOW BRIDGES ARE FLOODED AND VERY DANGEROUS INCLUDING WILLIAM CANNON DRIVE
26.0 MAJOR FLOODING THREATENS A MOBILE HOME PARK ABOVE WILLIAM CANNON DRIVE. MANY ROADS AND BRIDGES ARE FLOODED AND VERY DANGEROUS. FLOW IS WELL INTO THE FLOOD PLAIN
24.0 MAJOR FLOODING THREATENS TEN SQUARE BLOCKS OF A MOBILE HOME PARK JUST ABOVE WILLIAM CANNON DRIVE. RESIDENTS SHOULD PREPARE TO EVACUATE AS EMERGENCY OFFICIALS ASSESS THE THREAT. MANY ROADS AND LOW BRIDGES ARE FLOODED AND VERY DANGEROUS
22.0 MODERATE LOWLAND FLOODING IS WELL INTO THE FLOOD PLAIN IMPACTING LOW ROADS AND BRIDGES. RESIDENTS OF A MOBILE HOME PARK ABOVE WILLIAM CANNON DRIVE SHOULD MONITOR NOAA WEATHER RADIO FOR DEVELOPING FLOOD WARNINGS
20.0 MODERATE LOWLAND FLOODING REACHES SECONDARY ROADS...LOW BRIDGES AND CROSSINGS IN AUSTIN MAKING THEM VERY DANGEROUS TO MOTORISTS - RESIDENTS OF A MOBILE HOME PARK ABOVE WILLIAM CANNON DRIVE SHOULD MONITOR HEAVY RAIN AND FLOOD REPORTS AND MOVE PROPERTY TO HIGHER GROUND
19.0 MINOR LOWLAND FLOODING COVERS LOWEST AREAS OF THE FLOOD PLAIN WITH NO DAMAGE. LOW ROADS AND BRIDGES FLOOD
17.0 MINOR LOWLAND FLOODING COVERS LOW AREAS OF THE FLOOD PLAIN AND LOW STREETS AND BRIDGES.
15.0 FLOW EXCEEDS LOWEST SECTIONS OF THE BANKS. LOW STREET CROSSINGS AND BRIDGES ARE THREATENED

Other Data Sources:
U.S. Geological Survey (USGS) Data and Site Info for US 183

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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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