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Guadalupe River at Seguin, TX (SEGT2)

Data Type




Inundation Levels
NAVD88 Stage

492.5*37.0*
Record Crest: 36.8 ft
491.536.0
490.535.0
489.534.0
488.533.0
487.532.0
486.531.0
485.530.0
484.529.0
483.528.0
482.527.0
Major Flooding Begins

481.526.0
480.525.0
478.523.0
Moderate Flooding Begins

477.522.0
476.521.0
475.520.0
Minor Flooding Begins

474.519.0
473.518.0
Near Flooding Begins

472.517.0
471.516.0
470.515.0
469.514.0
468.513.0
467.512.0
466.511.0
465.510.0
464.59.0
463.58.0
462.57.0
461.56.0
460.55.0
459.54.0
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:
-1.7 ft at 04/19/2024 11:15:00 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: 22
Flood Stage: 19
Action Stage: 17
Low Stage (in feet): -9999

Historic Crests
(1) 36.80 ft on 10/18/1998
(2) 35.50 ft on 06/16/1935
(3) 33.90 ft on 09/11/1952
(4) 33.00 ft on 01/01/1935
(5) 32.80 ft on 05/11/1972
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 19.24 ft on 10/14/2021
(2) 4.52 ft on 05/12/2020
(3) 7.98 ft on 05/14/2019
(4) 7.91 ft on 03/28/2018
(5) 7.29 ft on 03/10/2017
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
If you notice any errors in the below information, please contact our Webmaster
32 Several homes in low areas of the flood plain in Seguin are destroyed. Several structures are washed downstream. Nearly all of Treasure Island at Lake McQueeny is under water with homes severely flooded and damaged. Livestock in the flood plain above Seguin to below Cuero are cut off and potentially drowned.
29 Widespread disastrous flooding destroys lowest homes in the flood plain and damages many more. Numerous roads and bridges are severely flooded and dangerous.
26 Major flooding damages several homes in the Glen Cove Subdivision and downstream. Numerous roads, streets and bridges are extremely dangerous. Livestock should be moved from the flood plain immediately.
22 Moderate lowland flooding threatens homes in the Glen Cove Subdivdision in Seguin. Roads and low bridges near the river are flooded and dangerous. Runoff down Walnut Branch northwest of downtown Seguin threatens lowest homes and apartments.
19 Minor lowland flooding is in low areas of the flood plain approaching but not reaching lowest homes in Seguin. Runoff down Walnut Branch northwest of downtown Seguin is a threat to lowest homes and apartments. Flood waters have reached the lowest row of RV lots at the River Shade RV Park near the HWY 123 bridge.
17 Water starts to threaten RV lots closest to the river at the River Shafe RV Park near the HWY 123 bridge.
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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.