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Rio Grande at Rio Grande City, TX (RGDT2)


Data Type




Inundation Levels
NAVD88 Stage

165.6* 65.8*
Record Crest: 65.78 ft
164.8 65.0
164.5 64.7
163.8 64.0
162.8 63.0
161.8 62.0
160.8 61.0
159.8 60.0
158.8 59.0
157.8 58.0
156.8 57.0
155.8 56.0
154.8 55.0
153.8 54.0
152.8 53.0

Major Flooding Begins

151.8 52.0
150.8 51.0

Moderate Flooding Begins

149.8 50.0

Minor Flooding Begins

148.8 49.0
147.8 48.0

Near Flooding Begins

146.8 47.0
145.8 46.0
144.8 45.0
143.8 44.0
142.8 43.0
* = Extended rating
Weather Forecast Office Brownsville, TX West Gulf River Forecast Center

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Current Stage:
25.4 ft at 09/16/2014 19:15:00 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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Flood Categories (in feet)
Major Flood Stage:53
Moderate Flood Stage:51
Flood Stage:50
Action Stage:48

Historical Crests
(1) 65.78 ft on 09/27/1972
(2) 57.63 ft on 07/11/2010
(3) 57.31 ft on 07/16/2010
(4) 50.06 ft on 07/08/2010
(5) 32.34 ft on 09/29/1967
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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
66 The Rio Grande river reaches lowest areas of Rio Grande City itself - widespread disastrous flooding inundates most of the roads and highways in and out of town - hundreds of homes are flooded
63.5 Widespread flooding reaches much of the flood plain south of town and floods Highway 83 west of Rio Grande City - the Rio Grande river backs up the Arroyo Los Olmos and floods Highway 755 and threatens lowest homes in the Los Olmos flood plain
53 Major lowland flooding damages irrigation pumps, equipment, roads and threatens livestock - bridges in the flood plain are severely flooded and become dangerous - the river backs up on the Arroyo Los Olmos and floods the lowest homes near Highway 83 and FM 755 as well as floods these roads.
50 Irrigation pumps, equipment, livestock, roads and bridges flood in low areas
48 Minor lowland flooding damages irrigation pumps and equipment if they are not moved
Additional Information Collapse
Flood stage for the Rio Grande river at Rio Grande City has changed from 21.0 feet to 50.0 feet as of October 15, 2003. Users of historical data need to increase historical levels by 29.0 feet when comparing to current readings. As a result, the record stage of 36.78 feet has been adjusted to 65.78 feet to reflect this change in flood stage.
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Page last modified: 16-Jul-2014 2:12 AM
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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.