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SAN JOAQUIN RIVER - VERNALIS (VNSC1)
| Latitude: 37.68º N | Longitude: 121.27º W | Elevation: 35 Feet | | Forecast Type: Official Location |
| Location: San Joaquin County in California | Bulletin Group: San Joaquin | River Group: San Joaquin |
| Issuance Time: | May 22 2026 at 8:14 AM PDT | Next Issuance: | May 23 2026 at 9:00 AM PDT
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| Action/Monitor: 24.5 Feet | Minor Flood: 29.0 Feet | Moderate Flood: 32.0 Feet | Major Flood: 37.3 Feet |
# Tabular Observed and Forecast Hydrograph Information
#
# Location: San Joaquin River - Vernalis (VNSC1)
#
# File Generation Time: 05/22/2026 at 08:14 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 05/18/2026 at 06:00 AM PDT
# Maximum Observed Stage: 10.24 Feet
# Maximum Observed Flow: 2564 cfs
#
# Earliest Date & Time of Maximum Forecast: 05/22/2026 at 09:00 AM PDT
# Maximum Forecast Stage: 9.62 Feet
# Maximum Forecast Flow: 2083 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
05/17/2026 08 AM PDT 9.99 2365 Normal
05/17/2026 09 AM PDT 10.00 2373 + Normal
05/17/2026 10 AM PDT 10.03 2396 + Normal
05/17/2026 11 AM PDT 10.03 2396 0 Normal
05/17/2026 12 PM PDT 10.03 2396 0 Normal
05/17/2026 01 PM PDT 10.07 2428 + Normal
05/17/2026 02 PM PDT 10.07 2428 0 Normal
05/17/2026 03 PM PDT 10.07 2428 0 Normal
05/17/2026 04 PM PDT 10.09 2443 + Normal
05/17/2026 05 PM PDT 10.10 2451 + Normal
05/17/2026 06 PM PDT 10.11 2459 + Normal
05/17/2026 07 PM PDT 10.11 2459 0 Normal
05/17/2026 08 PM PDT 10.12 2467 + Normal
05/17/2026 09 PM PDT 10.13 2475 + Normal
05/17/2026 10 PM PDT 10.12 2467 - Normal
05/17/2026 11 PM PDT 10.13 2475 + Normal
05/18/2026 12 AM PDT 10.15 2491 + Normal
05/18/2026 01 AM PDT 10.16 2499 + Normal
05/18/2026 02 AM PDT 10.18 2515 + Normal
05/18/2026 03 AM PDT 10.18 2515 0 Normal
05/18/2026 04 AM PDT 10.20 2531 + Normal
05/18/2026 05 AM PDT 10.21 2539 + Normal
05/18/2026 06 AM PDT 10.24 2564 + Normal
05/18/2026 07 AM PDT 10.21 2539 - Normal
05/18/2026 08 AM PDT 10.22 2547 + Normal
05/18/2026 09 AM PDT 10.20 2531 - Normal
05/18/2026 10 AM PDT 10.18 2515 - Normal
05/18/2026 11 AM PDT 10.16 2499 - Normal
05/18/2026 12 PM PDT 10.14 2483 - Normal
05/18/2026 01 PM PDT 10.11 2459 - Normal
05/18/2026 02 PM PDT 10.10 2451 - Normal
05/18/2026 03 PM PDT 10.07 2428 - Normal
05/18/2026 04 PM PDT 10.05 2412 - Normal
05/18/2026 05 PM PDT 10.05 2412 0 Normal
05/18/2026 06 PM PDT 10.03 2396 - Normal
05/18/2026 07 PM PDT 10.02 2388 - Normal
05/18/2026 08 PM PDT 10.03 2396 + Normal
05/18/2026 09 PM PDT 10.02 2388 - Normal
05/18/2026 10 PM PDT 10.01 2380 - Normal
05/18/2026 11 PM PDT 9.99 2365 - Normal
05/19/2026 12 AM PDT 9.98 2357 - Normal
05/19/2026 01 AM PDT 9.97 2349 - Normal
05/19/2026 02 AM PDT 9.96 2341 - Normal
05/19/2026 03 AM PDT 9.96 2341 0 Normal
05/19/2026 04 AM PDT 9.96 2341 0 Normal
05/19/2026 05 AM PDT 9.96 2341 0 Normal
05/19/2026 06 AM PDT 9.97 2349 + Normal
05/19/2026 07 AM PDT 9.96 2341 - Normal
05/19/2026 08 AM PDT 9.95 2333 - Normal
05/19/2026 09 AM PDT 9.93 2318 - Normal
05/19/2026 10 AM PDT 9.94 2326 + Normal
05/19/2026 11 AM PDT 9.94 2326 0 Normal
05/19/2026 12 PM PDT 9.95 2333 + Normal
05/19/2026 01 PM PDT 9.96 2341 + Normal
05/19/2026 02 PM PDT 9.97 2349 + Normal
05/19/2026 03 PM PDT 9.95 2333 - Normal
05/19/2026 04 PM PDT 9.94 2326 - Normal
05/19/2026 05 PM PDT 9.91 2302 - Normal
05/19/2026 06 PM PDT 9.93 2318 + Normal
05/19/2026 07 PM PDT 9.92 2310 - Normal
05/19/2026 08 PM PDT 9.93 2318 + Normal
05/19/2026 09 PM PDT 9.92 2310 - Normal
05/19/2026 10 PM PDT 9.91 2302 - Normal
05/19/2026 11 PM PDT 9.91 2302 0 Normal
05/20/2026 12 AM PDT 9.91 2302 0 Normal
05/20/2026 01 AM PDT 9.91 2302 0 Normal
05/20/2026 02 AM PDT 9.91 2302 0 Normal
05/20/2026 03 AM PDT 9.91 2302 0 Normal
05/20/2026 04 AM PDT 9.91 2302 0 Normal
05/20/2026 05 AM PDT 9.91 2302 0 Normal
05/20/2026 06 AM PDT 9.91 2302 0 Normal
05/20/2026 07 AM PDT 9.91 2302 0 Normal
05/20/2026 08 AM PDT 9.91 2302 0 Normal
05/20/2026 09 AM PDT 9.91 2302 0 Normal
05/20/2026 10 AM PDT 9.91 2302 0 Normal
05/20/2026 11 AM PDT 9.91 2302 0 Normal
05/20/2026 12 PM PDT 9.91 2302 0 Normal
05/20/2026 01 PM PDT 9.91 2302 0 Normal
05/20/2026 02 PM PDT 9.92 2310 + Normal
05/20/2026 03 PM PDT 9.92 2310 0 Normal
05/20/2026 04 PM PDT 9.91 2302 - Normal
05/20/2026 05 PM PDT 9.91 2302 0 Normal
05/20/2026 06 PM PDT 9.91 2302 0 Normal
05/20/2026 07 PM PDT 9.92 2310 + Normal
05/20/2026 08 PM PDT 9.92 2310 0 Normal
05/20/2026 09 PM PDT 9.93 2318 + Normal
05/20/2026 10 PM PDT 9.93 2318 0 Normal
05/20/2026 11 PM PDT 9.95 2333 + Normal
05/21/2026 12 AM PDT 9.95 2333 0 Normal
05/21/2026 01 AM PDT 9.95 2333 0 Normal
05/21/2026 02 AM PDT 9.96 2341 + Normal
05/21/2026 03 AM PDT 9.97 2349 + Normal
05/21/2026 04 AM PDT 9.98 2357 + Normal
05/21/2026 05 AM PDT 9.99 2365 + Normal
05/21/2026 06 AM PDT 10.00 2373 + Normal
05/21/2026 07 AM PDT 10.00 2373 0 Normal
05/21/2026 08 AM PDT 9.99 2365 - Normal
05/21/2026 09 AM PDT 9.99 2365 0 Normal
05/21/2026 10 AM PDT 9.98 2357 - Normal
05/21/2026 11 AM PDT 9.98 2357 0 Normal
05/21/2026 12 PM PDT 9.95 2333 - Normal
05/21/2026 01 PM PDT 9.95 2333 0 Normal
05/21/2026 02 PM PDT 9.92 2310 - Normal
05/21/2026 03 PM PDT 9.89 2287 - Normal
05/21/2026 04 PM PDT 9.88 2279 - Normal
05/21/2026 05 PM PDT 9.84 2249 - Normal
05/21/2026 06 PM PDT 9.82 2233 - Normal
05/21/2026 07 PM PDT 9.80 2218 - Normal
05/21/2026 08 PM PDT 9.77 2195 - Normal
05/21/2026 09 PM PDT 9.78 2203 + Normal
05/21/2026 10 PM PDT 9.76 2188 - Normal
05/21/2026 11 PM PDT 9.74 2173 - Normal
05/22/2026 12 AM PDT 9.71 2150 - Normal
05/22/2026 01 AM PDT 9.71 2150 0 Normal
05/22/2026 02 AM PDT 9.71 2150 0 Normal
05/22/2026 03 AM PDT 9.69 2135 - Normal
05/22/2026 04 AM PDT 9.68 2128 - Normal
05/22/2026 05 AM PDT 9.67 2120 - Normal
05/22/2026 06 AM PDT 9.66 2113 - Normal
05/22/2026 07 AM PDT 9.64 2098 - Normal
05/22/2026 08 AM PDT 9.63 2090 - Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
05/22/2026 09 AM PDT 9.62 2083 Normal
05/22/2026 10 AM PDT 9.61 2076 - Normal
05/22/2026 11 AM PDT 9.60 2068 - Normal
05/22/2026 12 PM PDT 9.59 2061 - Normal
05/22/2026 01 PM PDT 9.58 2053 - Normal
05/22/2026 02 PM PDT 9.57 2046 - Normal
05/22/2026 03 PM PDT 9.57 2046 0 Normal
05/22/2026 04 PM PDT 9.56 2039 - Normal
05/22/2026 05 PM PDT 9.55 2031 - Normal
05/22/2026 06 PM PDT 9.55 2031 0 Normal
05/22/2026 07 PM PDT 9.54 2024 - Normal
05/22/2026 08 PM PDT 9.54 2024 0 Normal
05/22/2026 09 PM PDT 9.53 2017 - Normal
05/22/2026 10 PM PDT 9.53 2017 0 Normal
05/22/2026 11 PM PDT 9.52 2009 - Normal
05/23/2026 12 AM PDT 9.52 2009 0 Normal
05/23/2026 01 AM PDT 9.51 2002 - Normal
05/23/2026 02 AM PDT 9.51 2002 0 Normal
05/23/2026 03 AM PDT 9.51 2002 0 Normal
05/23/2026 04 AM PDT 9.50 1995 - Normal
05/23/2026 05 AM PDT 9.50 1995 0 Normal
05/23/2026 06 AM PDT 9.50 1995 0 Normal
05/23/2026 07 AM PDT 9.49 1988 - Normal
05/23/2026 08 AM PDT 9.49 1988 0 Normal
05/23/2026 09 AM PDT 9.49 1988 0 Normal
05/23/2026 10 AM PDT 9.49 1988 0 Normal
05/23/2026 11 AM PDT 9.49 1988 0 Normal
05/23/2026 12 PM PDT 9.48 1980 - Normal
05/23/2026 01 PM PDT 9.48 1980 0 Normal
05/23/2026 02 PM PDT 9.48 1980 0 Normal
05/23/2026 03 PM PDT 9.48 1980 0 Normal
05/23/2026 04 PM PDT 9.48 1980 0 Normal
05/23/2026 05 PM PDT 9.48 1980 0 Normal
05/23/2026 06 PM PDT 9.48 1980 0 Normal
05/23/2026 07 PM PDT 9.48 1980 0 Normal
05/23/2026 08 PM PDT 9.47 1973 - Normal
05/23/2026 09 PM PDT 9.47 1973 0 Normal
05/23/2026 10 PM PDT 9.47 1973 0 Normal
05/23/2026 11 PM PDT 9.47 1973 0 Normal
05/24/2026 12 AM PDT 9.47 1973 0 Normal
05/24/2026 01 AM PDT 9.47 1973 0 Normal
05/24/2026 02 AM PDT 9.46 1966 - Normal
05/24/2026 03 AM PDT 9.46 1966 0 Normal
05/24/2026 04 AM PDT 9.46 1966 0 Normal
05/24/2026 05 AM PDT 9.45 1959 - Normal
05/24/2026 06 AM PDT 9.45 1959 0 Normal
05/24/2026 07 AM PDT 9.44 1951 - Normal
05/24/2026 08 AM PDT 9.43 1944 - Normal
05/24/2026 09 AM PDT 9.43 1944 0 Normal
05/24/2026 10 AM PDT 9.42 1937 - Normal
05/24/2026 11 AM PDT 9.41 1930 - Normal
05/24/2026 12 PM PDT 9.41 1930 0 Normal
05/24/2026 01 PM PDT 9.40 1923 - Normal
05/24/2026 02 PM PDT 9.39 1916 - Normal
05/24/2026 03 PM PDT 9.39 1916 0 Normal
05/24/2026 04 PM PDT 9.38 1908 - Normal
05/24/2026 05 PM PDT 9.37 1901 - Normal
05/24/2026 06 PM PDT 9.37 1901 0 Normal
05/24/2026 07 PM PDT 9.36 1894 - Normal
05/24/2026 08 PM PDT 9.35 1887 - Normal
05/24/2026 09 PM PDT 9.35 1887 0 Normal
05/24/2026 10 PM PDT 9.34 1880 - Normal
05/24/2026 11 PM PDT 9.34 1880 0 Normal
05/25/2026 12 AM PDT 9.33 1873 - Normal
05/25/2026 01 AM PDT 9.32 1866 - Normal
05/25/2026 02 AM PDT 9.32 1866 0 Normal
05/25/2026 03 AM PDT 9.31 1859 - Normal
05/25/2026 04 AM PDT 9.31 1859 0 Normal
05/25/2026 05 AM PDT 9.30 1852 - Normal
05/25/2026 06 AM PDT 9.30 1852 0 Normal
05/25/2026 07 AM PDT 9.29 1845 - Normal
05/25/2026 08 AM PDT 9.29 1845 0 Normal
05/25/2026 09 AM PDT 9.29 1845 0 Normal
05/25/2026 10 AM PDT 9.28 1838 - Normal
05/25/2026 11 AM PDT 9.28 1838 0 Normal
05/25/2026 12 PM PDT 9.27 1831 - Normal
05/25/2026 01 PM PDT 9.27 1831 0 Normal
05/25/2026 02 PM PDT 9.27 1831 0 Normal
05/25/2026 03 PM PDT 9.26 1824 - Normal
05/25/2026 04 PM PDT 9.26 1824 0 Normal
05/25/2026 05 PM PDT 9.26 1824 0 Normal
05/25/2026 06 PM PDT 9.26 1824 0 Normal
05/25/2026 07 PM PDT 9.25 1817 - Normal
05/25/2026 08 PM PDT 9.25 1817 0 Normal
05/25/2026 09 PM PDT 9.25 1817 0 Normal
05/25/2026 10 PM PDT 9.24 1810 - Normal
05/25/2026 11 PM PDT 9.24 1810 0 Normal
05/26/2026 12 AM PDT 9.24 1810 0 Normal
05/26/2026 01 AM PDT 9.24 1810 0 Normal
05/26/2026 02 AM PDT 9.23 1803 - Normal
05/26/2026 03 AM PDT 9.23 1803 0 Normal
05/26/2026 04 AM PDT 9.22 1796 - Normal
05/26/2026 05 AM PDT 9.22 1796 0 Normal
05/26/2026 06 AM PDT 9.21 1789 - Normal
05/26/2026 07 AM PDT 9.21 1789 0 Normal
05/26/2026 08 AM PDT 9.20 1782 - Normal
05/26/2026 09 AM PDT 9.20 1782 0 Normal
05/26/2026 10 AM PDT 9.19 1775 - Normal
05/26/2026 11 AM PDT 9.18 1768 - Normal
05/26/2026 12 PM PDT 9.17 1761 - Normal
05/26/2026 01 PM PDT 9.16 1754 - Normal
05/26/2026 02 PM PDT 9.16 1754 0 Normal
05/26/2026 03 PM PDT 9.15 1747 - Normal
05/26/2026 04 PM PDT 9.14 1740 - Normal
05/26/2026 05 PM PDT 9.13 1734 - Normal
05/26/2026 06 PM PDT 9.12 1727 - Normal
05/26/2026 07 PM PDT 9.12 1727 0 Normal
05/26/2026 08 PM PDT 9.11 1720 - Normal
05/26/2026 09 PM PDT 9.10 1713 - Normal
05/26/2026 10 PM PDT 9.09 1706 - Normal
05/26/2026 11 PM PDT 9.09 1706 0 Normal
05/27/2026 12 AM PDT 9.08 1700 - Normal
05/27/2026 01 AM PDT 9.07 1693 - Normal
05/27/2026 02 AM PDT 9.06 1686 - Normal
05/27/2026 03 AM PDT 9.06 1686 0 Normal
05/27/2026 04 AM PDT 9.05 1679 - Normal
05/27/2026 05 AM PDT 9.05 1679 0 Normal
#
# NOTE 1: Stages are rounded to the nearest hundredth (.01) of a foot.
# NOTE 2: Flows are rounded to the nearest (1) cfs.
# NOTE 3: Trends are determined using hourly change in unrounded stage and flow.
# NOTE 4: Maximum Values are determined using unrounded stage and flow.
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