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Hydrograph River at a Glance Download
San Joaquin River at Vernalis Stage (ft)Flow (kcfs)Highest Observation: 7.7 ft at 7:00AM Sep 23, 2020Observed: 7.6 ft at 7:00AM Sep 24, 2020Observed: 7.6 ft at 8:00AM Sep 25, 2020Highest Forecast: 7.6 ft 9:00PM Sep 25, 2020Highest Forecast: 7.6 ft 10:00PM Sep 25, 2020Highest Forecast: 7.6 ft 11:00PM Sep 25, 2020Highest Forecast: 7.6 ft 12:00AM Sep 26, 2020Highest Forecast: 7.6 ft 1:00AM Sep 26, 2020Highest Forecast: 7.6 ft 2:00AM Sep 26, 2020Highest Forecast: 7.6 ft 3:00AM Sep 26, 2020Highest Forecast: 7.6 ft 4:00AM Sep 26, 2020Highest Forecast: 7.6 ft 5:00AM Sep 26, 2020Highest Forecast: 7.6 ft 6:00AM Sep 26, 2020Highest Forecast: 7.6 ft 7:00AM Sep 26, 2020Highest Forecast: 7.6 ft 8:00AM Sep 26, 2020Highest Forecast: 7.6 ft 9:00AM Sep 26, 2020Highest Forecast: 7.6 ft 10:00AM Sep 26, 2020Highest Forecast: 7.6 ft 11:00AM Sep 26, 2020Highest Forecast: 7.6 ft 12:00PM Sep 26, 2020Highest Forecast: 7.6 ft 1:00PM Sep 26, 2020Highest Forecast: 7.6 ft 2:00PM Sep 26, 2020Highest Forecast: 7.6 ft 3:00PM Sep 26, 2020Highest Forecast: 7.6 ft 4:00PM Sep 26, 2020Highest Forecast: 7.6 ft 5:00PM Sep 26, 2020Highest Forecast: 7.6 ft 6:00PM Sep 26, 2020Highest Forecast: 7.6 ft 7:00PM Sep 26, 2020Highest Forecast: 7.6 ft 8:00PM Sep 26, 2020Highest Forecast: 7.6 ft 9:00PM Sep 26, 2020Highest Forecast: 7.6 ft 10:00PM Sep 26, 2020Highest Forecast: 7.6 ft 11:00PM Sep 26, 2020Highest Forecast: 7.6 ft 12:00AM Sep 27, 2020Highest Forecast: 7.6 ft 1:00AM Sep 27, 2020Highest Forecast: 7.6 ft 2:00AM Sep 27, 2020Highest Forecast: 7.6 ft 3:00AM Sep 27, 2020Highest Forecast: 7.6 ft 4:00AM Sep 27, 2020Highest Forecast: 7.6 ft 5:00AM Sep 27, 2020Highest Forecast: 7.6 ft 6:00AM Sep 27, 2020Highest Forecast: 7.6 ft 7:00AM Sep 27, 2020Highest Forecast: 7.6 ft 8:00AM Sep 27, 2020Highest Forecast: 7.6 ft 9:00AM Sep 27, 2020Highest Forecast: 7.6 ft 10:00AM Sep 27, 2020Highest Forecast: 7.6 ft 11:00AM Sep 27, 2020Highest Forecast: 7.6 ft 12:00PM Sep 27, 2020Highest Forecast: 7.6 ft 1:00PM Sep 27, 2020Highest Forecast: 7.6 ft 2:00PM Sep 27, 2020Highest Forecast: 7.6 ft 3:00PM Sep 27, 2020Highest Forecast: 7.6 ft 4:00PM Sep 27, 2020Highest Forecast: 7.6 ft 5:00PM Sep 27, 2020Highest Forecast: 7.6 ft 6:00PM Sep 27, 2020Highest Forecast: 7.6 ft 7:00PM Sep 27, 2020Highest Forecast: 7.6 ft 8:00PM Sep 27, 2020Highest Forecast: 7.6 ft 9:00PM Sep 27, 2020Highest Forecast: 7.6 ft 10:00PM Sep 27, 2020Highest Forecast: 7.6 ft 11:00PM Sep 27, 2020Highest Forecast: 7.6 ft 12:00AM Sep 28, 2020Highest Forecast: 7.6 ft 1:00AM Sep 28, 2020Highest Forecast: 7.6 ft 2:00AM Sep 28, 2020Highest Forecast: 7.6 ft 3:00AM Sep 28, 2020Highest Forecast: 7.6 ft 4:00AM Sep 28, 2020Highest Forecast: 7.6 ft 5:00AM Sep 28, 2020Highest Forecast: 7.6 ft 6:00AM Sep 28, 2020Highest Forecast: 7.6 ft 7:00AM Sep 28, 2020Highest Forecast: 7.6 ft 8:00AM Sep 28, 2020Highest Forecast: 7.6 ft 9:00AM Sep 28, 2020Highest Forecast: 7.6 ft 10:00AM Sep 28, 2020Highest Forecast: 7.6 ft 11:00AM Sep 28, 2020Highest Forecast: 7.6 ft 12:00PM Sep 28, 2020Highest Forecast: 7.6 ft 1:00PM Sep 28, 2020Highest Forecast: 7.6 ft 2:00PM Sep 28, 2020Highest Forecast: 7.6 ft 3:00PM Sep 28, 2020Highest Forecast: 7.6 ft 4:00PM Sep 28, 2020Highest Forecast: 7.6 ft 5:00PM Sep 28, 2020Highest Forecast: 7.6 ft 6:00PM Sep 28, 2020Highest Forecast: 7.6 ft 7:00PM Sep 28, 2020Highest Forecast: 7.6 ft 8:00PM Sep 28, 2020Highest Forecast: 7.6 ft 9:00PM Sep 28, 2020Highest Forecast: 7.6 ft 10:00PM Sep 28, 2020Highest Forecast: 7.6 ft 11:00PM Sep 28, 2020Highest Forecast: 7.6 ft 12:00AM Sep 29, 2020Highest Forecast: 7.6 ft 1:00AM Sep 29, 2020Highest Forecast: 7.6 ft 2:00AM Sep 29, 2020Highest Forecast: 7.6 ft 3:00AM Sep 29, 2020Highest Forecast: 7.6 ft 4:00AM Sep 29, 2020Highest Forecast: 7.6 ft 5:00AM Sep 29, 2020Highest Forecast: 7.6 ft 6:00AM Sep 29, 2020Highest Forecast: 7.6 ft 7:00AM Sep 29, 2020Highest Forecast: 7.6 ft 8:00AM Sep 29, 2020Highest Forecast: 7.6 ft 9:00AM Sep 29, 2020Highest Forecast: 7.6 ft 10:00AM Sep 29, 2020Highest Forecast: 7.6 ft 11:00AM Sep 29, 2020Highest Forecast: 7.6 ft 12:00PM Sep 29, 2020Highest Forecast: 7.6 ft 1:00PM Sep 29, 2020Highest Forecast: 7.6 ft 2:00PM Sep 29, 2020Highest Forecast: 7.6 ft 3:00PM Sep 29, 2020Highest Forecast: 7.6 ft 4:00PM Sep 29, 2020Highest Forecast: 7.6 ft 5:00PM Sep 29, 2020Highest Forecast: 7.6 ft 6:00PM Sep 29, 2020Highest Forecast: 7.6 ft 7:00PM Sep 29, 2020Highest Forecast: 7.6 ft 8:00PM Sep 29, 2020Highest Forecast: 7.6 ft 9:00PM Sep 29, 2020Highest Forecast: 7.6 ft 10:00PM Sep 29, 2020Highest Forecast: 7.6 ft 11:00PM Sep 29, 2020Highest Forecast: 7.6 ft 12:00AM Sep 30, 2020Highest Forecast: 7.6 ft 1:00AM Sep 30, 2020Highest Forecast: 7.6 ft 2:00AM Sep 30, 2020Highest Forecast: 7.6 ft 3:00AM Sep 30, 2020Highest Forecast: 7.6 ft 4:00AM Sep 30, 2020Highest Forecast: 7.6 ft 5:00AM Sep 30, 2020USGS--Water Resources of the United StatesVNSC1(plotting HGIRZ) Graph Created (8:07PM Sep 25, 2020)ObservedForecast (issued 8:06AM Sep 25)Latest observed value: 7.6 ft at 8:00 AM PDT 25-Sep-2020. Flood Stage is 29 ft
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About this graph
Tabular Data (UTC)
Tabular Data (PDT)
XML Data
RSS Files
Datum: NGVD29
Metadata
NOTE: Forecasts for the San Joaquin River at Vernalis are issued routinely year-round.
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Upstream Gauge - at Patterson Upstream Gauge Downstream Gauge Downstream Gauge - at Mossdale Bridge
Flood Categories (in feet)
Major Flood Stage: 37.3
Moderate Flood Stage: 32
Flood Stage: 29
Action Stage: 24.5
Low Stage (in feet): 0

Historic Crests
(1) 34.88 ft on 01/05/1997
(2) 34.55 ft on 01/27/1969
(3) 32.81 ft on 12/09/1950
(4) 32.71 ft on 03/16/1938
(5) 32.11 ft on 02/12/1938
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 21.69 ft on 03/04/2019
(2) 17.83 ft on 04/08/2018
(3) 30.72 ft on 02/23/2017
(4) 14.21 ft on 03/15/2016
(5) 9.66 ft on 04/26/2015
Show More 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
37.29 Stages above 37.3 feet results in flooding outside the levees. Top of levee.
26 Severe seepage occurs outside the levees. The area covered by seepage will increase as the river stage rises.
21 Seepage begins into crop area outside of levees.
About This Location Collapse

Latitude: 37.676041° N, Longitude: 121.266329° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 29 ft 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 25.0 Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

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.
NWS Information
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