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Onion Creek at US 183, TX (ATIT2)


Data Type




Inundation Levels
NAVD88 Stage

Record Crest: 40.15 ft
482.4 39.3
481.4 38.3
480.4 37.3
479.4 36.3
478.4 35.3
477.4 34.3
476.4 33.3
475.4 32.3
474.4 31.3
473.4 30.3
472.4 29.3
471.4 28.3
470.4 27.3
469.4 26.3
468.4 25.3
467.4 24.3

Major Flooding Begins

466.4 23.3
465.4 22.3
464.4 21.3
463.4 20.3

Moderate Flooding Begins

462.4 19.3
461.4 18.3
460.4 17.3

Minor Flooding Begins

459.4 16.3
458.4 15.3
* = Extended rating
Weather Forecast Office Austin/San Antonio, TX West Gulf River Forecast Center

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Current Stage:
4.6 ft at 10/23/2014 04:00:00 UTC
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Inundation Legend Inundation Legend
USGS Gauge Location Gauge Location

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.

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Map Overlays

Flood Categories (in feet)
Major Flood Stage:24
Moderate Flood Stage:20
Flood Stage:17
Action Stage:15

Historical Crests
(1) 40.15 ft on 10/31/2013
(2) 38.00 ft on 07/03/1869
(3) 38.00 ft on 09/09/1921
(4) 36.50 ft on 11/16/2001
(5) 32.00 ft on 10/17/1998
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(P): Preliminary values subject to further review.

Low Water Records

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.

Extended rating:
Rating Curve Extension - The Rating Curve Extension is calculated by using either a linear, logarithmic, or hydraulic technique to extend the rating curve above the currently established relationship between stage and flow.

Flood Impacts Collapse
If you notice any errors in the below information, please contact our Webmaster
54 Height of instruments inside gauge house.
49 Floor of bridge near the centerline of Onion Creek.
40 Floods sheds at the county maintenance facility right bank upstream floods.
30 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.
28 Major flooding. Many roads and low bridges are flooded and very dangerous including William Cannon Drive.
26 Major flooding. Many roads and bridges are flooded and very dangerous. Flow is well into the flood plain.
24 Major flooding. Many roads and low bridges are flooded and very dangerous.
22 Moderate lowland flooding is well into the flood plain impacting low roads and bridges.
20 Moderate lowland flooding reaches secondary roads, low bridges and crossings in Austin making them very dangerous to motorists.
19 Minor lowland flooding covers lowest areas of the flood plain with no damage. Low roads and bridges flood.
17 Minor lowland flooding covers low areas of the flood plain and low streets and bridges.
15 Flow exceeds lowest sections of the banks. Low street crossings and bridges are threatened.
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Page last modified: 15-Jul-2014 6:27 PM
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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.