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San Gabriel River at Georgetown South Fork, TX (GETT2)

Data Type




Inundation Levels
NAVD88 Stage

731.0*43.0*
730.0*42.0*
729.0*41.0*
Record Crest: 41 ft
728.040.0
727.039.0
726.038.0
725.037.0
724.036.0
723.035.0
722.034.0
721.033.0
720.032.0
719.031.0
718.030.0
717.029.0
716.028.0
715.027.0
Major Flooding Begins

714.026.0
713.025.0
712.024.0
711.023.0
710.022.0
709.021.0
708.020.0
707.019.0
706.018.0
705.017.0
704.016.0
703.015.0
702.014.0
Moderate Flooding Begins

701.013.0
700.012.0
699.011.0
698.010.0
Minor Flooding Begins

697.09.0
Near Flooding Begins


Below Flooding Begins

* = Extended rating
Weather Forecast Office Austin/San Antonio, TX West Gulf River Forecast Center
Hydrograph River at a Glance Download Inundation
Mapping
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Click on mapped inundation to see water depth values for that location, or hold shift and drag to zoom to area.

Current Stage:
2.5 ft at 04/23/2024 12:45:00 UTC
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Inundation Legend
Depth in feet
USGS Gauge Location Gauge Location
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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.

Gauge Information Collapse

Map Overlays
Flood Categories (in feet)
Major Flood Stage: 26
Moderate Flood Stage: 13
Flood Stage: 9
Action Stage: 5
Low Stage (in feet): -9999

Historic Crests
(1) 41.00 ft on 04/24/1956
(2) 31.65 ft on 06/27/2007
(3) 27.06 ft on 11/15/2001
(4) 24.60 ft on 09/03/1981
(5) 23.93 ft on 09/22/2018
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 9.29 ft on 05/08/2019
(2) 23.93 ft on 09/22/2018
(3) 11.26 ft on 10/31/2015 (P)
(4) 15.75 ft on 05/26/2015
(5) 17.12 ft on 05/24/2015
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

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
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26 Major lowland flooding closes many streets and roads. Much of the city park downstream floods. Lowest homes above Georgetown to Granger Lake are threatened.
23 Moderate lowland flooding inundates many secondary and primary roads near the San Gabriel River. Facilities and equipment well into the flood plain are flooded. Residents of lowest homes in the flood plain above Georgetown to Granger Lake should monitor NOAA Weather Radio for developing heavy rain and flood conditions.
20 Moderate lowland flooding closes secondary and primary roads near the river. The city park is severely flooded. Livestock and equipment should be moved from the flood plain from the headwaters to Granger Lake.
17 Moderate lowland flooding inundates many secondary and primary roads near the San Gabriel River from the headwaters of the South Fork to Granger Lake. The city park in Georgetown and any facilities and equipment in the flood plain are damaged.
13 Moderate lowland flooding inundates secondary roads and low bridges. Flow enters the lowest areas of the city park.
9 Minor lowland flooding reaches low areas of the flood plain with no significant damage. Lowest areas of the city park downtown are flooded.
5 Flow exceeds lowest sections of the banks.
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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.