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Hydrograph River at a Glance Download
Frio River at Choke Canyon Dam Pool (ft)Observed: 204.82 ft at 7:30AM Jul 26, 2021Highest Observation: 204.87 ft at 7:00AM Jul 27, 2021Highest Observation: 204.87 ft at 7:30AM Jul 27, 2021Observed: 204.84 ft at 7:00AM Jul 28, 2021Observed: 204.84 ft at 7:30AM Jul 28, 2021Observed: 204.77 ft at 7:00AM Jul 29, 2021Observed: 204.77 ft at 7:30AM Jul 29, 2021Observed: 204.82 ft at 7:00AM Jul 30, 2021Observed: 204.82 ft at 7:30AM Jul 30, 2021USGS--Water Resources of the United StatesCHOT2(plotting HPIRZ) Graph Created (7:02AM Jul 31, 2021)ObservedLatest observed value: 204.82 ft at 7:30 AM CDT 30-Jul-2021.
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About this graph
Tabular Data (UTC)
Tabular Data (CDT)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Forecasts are not available for the Frio River at Choke Canyon Dam. Only observed stages are available for this point.
Return to Area Map
Upstream Gauge - at Tilden Upstream Gauge
Flood Categories (in feet)
Major Flood Stage: 0
Moderate Flood Stage: 0
Flood Stage: 0
Action Stage: 0
Low Stage (in feet): 0

Historic Crests

(P): Preliminary values subject to further review.

Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
Zoom Level:16
KML Image
Gauge LocationGauge Map Marker
 Disclaimer
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.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
Photos
(1) Choke Canyon Dam Looking Northeast
(2) Choke Canyon Dam Looking Northward
(3) Another Northward View of Reservoir
(4) Release Gates At Choke Canyon Dam
(5) Release Gates - Choke Canyon Dam
(6) Looking Downstream From Release Gates
(7) Looking Toward Gates at Reservoir
(8) Releases at Choke Canyon Dam
(9) Release Gates at Choke Canyon Dam
(10) July 2002 Areal View Showing Releases Downstream
(11) July 2002 Areal View of Dam
(12) Releases at Dam During July 2002
(13) July 2002: Frio River Heading Into Choke Canyon
About This Location Collapse

Latitude: 28.483611° N, Longitude: 98.245556° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft Not Available Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)		 Elevation
(gauge height = flood stage)		 Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other 0 ft 0 ft  

Current/Historical Observations:
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The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
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