National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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SAN JOAQUIN RIVER - PATTERSON (PATC1)
Latitude: 37.49º NLongitude: 121.08º WElevation: 97 FeetForecast Type: Official Location
Location: Stanislaus County in CaliforniaBulletin Group: San JoaquinRiver Group: San Joaquin
Issuance Time: Apr 01 2026 at 1:20 PM PDTNext Issuance: Apr 02 2026 at 9:00 AM PDT
Action/Monitor: 48.0 FeetMinor Flood: 54.7 FeetModerate Flood: 57.3 FeetMajor Flood: 58.3 Feet


# Tabular Observed and Forecast Hydrograph Information
#
# Location: San Joaquin River - Patterson (PATC1)
#
# File Generation Time:  04/01/2026 at 01:20 PM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  03/30/2026 at 01:00 PM PDT
# Maximum Observed Stage:                       32.88 Feet
# Maximum Observed Flow:                        1103 cfs
#
# Earliest Date & Time of Maximum Forecast:     04/02/2026 at 08:00 AM PDT
# Maximum Forecast Stage:                       32.78 Feet
# Maximum Forecast Flow:                        1064 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  03/27/2026 01 PM PDT           32.85           1091                        Normal
  03/27/2026 02 PM PDT           32.84           1087         -              Normal
  03/27/2026 03 PM PDT           32.85           1091         +              Normal
  03/27/2026 04 PM PDT           32.84           1087         -              Normal
  03/27/2026 05 PM PDT           32.84           1087         0              Normal
  03/27/2026 06 PM PDT           32.82           1079         -              Normal
  03/27/2026 07 PM PDT           32.82           1079         0              Normal
  03/27/2026 08 PM PDT           32.81           1075         -              Normal
  03/27/2026 09 PM PDT           32.81           1075         0              Normal
  03/27/2026 10 PM PDT           32.80           1071         -              Normal
  03/27/2026 11 PM PDT           32.79           1067         -              Normal
  03/28/2026 12 AM PDT           32.79           1067         0              Normal
  03/28/2026 01 AM PDT           32.77           1060         -              Normal
  03/28/2026 02 AM PDT           32.78           1064         +              Normal
  03/28/2026 03 AM PDT           32.77           1060         -              Normal
  03/28/2026 04 AM PDT           32.77           1060         0              Normal
  03/28/2026 05 AM PDT           32.77           1060         0              Normal
  03/28/2026 06 AM PDT           32.77           1060         0              Normal
  03/28/2026 07 AM PDT           32.76           1056         -              Normal
  03/28/2026 08 AM PDT           32.77           1060         +              Normal
  03/28/2026 09 AM PDT           32.77           1060         0              Normal
  03/28/2026 10 AM PDT           32.77           1060         0              Normal
  03/28/2026 11 AM PDT           32.77           1060         0              Normal
  03/28/2026 12 PM PDT           32.79           1067         +              Normal
  03/28/2026 01 PM PDT           32.79           1067         0              Normal
  03/28/2026 02 PM PDT           32.80           1071         +              Normal
  03/28/2026 03 PM PDT           32.81           1075         +              Normal
  03/28/2026 04 PM PDT           32.81           1075         0              Normal
  03/28/2026 05 PM PDT           32.82           1079         +              Normal
  03/28/2026 06 PM PDT           32.85           1091         +              Normal
  03/28/2026 07 PM PDT           32.83           1083         -              Normal
  03/28/2026 08 PM PDT           32.82           1079         -              Normal
  03/28/2026 09 PM PDT           32.83           1083         +              Normal
  03/28/2026 10 PM PDT           32.83           1083         0              Normal
  03/28/2026 11 PM PDT           32.84           1087         +              Normal
  03/29/2026 12 AM PDT           32.84           1087         0              Normal
  03/29/2026 01 AM PDT           32.82           1079         -              Normal
  03/29/2026 02 AM PDT           32.82           1079         0              Normal
  03/29/2026 03 AM PDT           32.82           1079         0              Normal
  03/29/2026 04 AM PDT           32.83           1083         +              Normal
  03/29/2026 05 AM PDT           32.82           1079         -              Normal
  03/29/2026 06 AM PDT           32.81           1075         -              Normal
  03/29/2026 07 AM PDT           32.81           1075         0              Normal
  03/29/2026 08 AM PDT           32.82           1079         +              Normal
  03/29/2026 09 AM PDT           32.84           1087         +              Normal
  03/29/2026 10 AM PDT           32.85           1091         +              Normal
  03/29/2026 11 AM PDT           32.84           1087         -              Normal
  03/29/2026 12 PM PDT           32.84           1087         0              Normal
  03/29/2026 01 PM PDT           32.85           1091         +              Normal
  03/29/2026 02 PM PDT           32.85           1091         0              Normal
  03/29/2026 03 PM PDT           32.84           1087         -              Normal
  03/29/2026 04 PM PDT           32.84           1087         0              Normal
  03/29/2026 05 PM PDT           32.83           1083         -              Normal
  03/29/2026 06 PM PDT           32.82           1079         -              Normal
  03/29/2026 07 PM PDT           32.81           1075         -              Normal
  03/29/2026 08 PM PDT           32.80           1071         -              Normal
  03/29/2026 09 PM PDT           32.80           1071         0              Normal
  03/29/2026 10 PM PDT           32.80           1071         0              Normal
  03/29/2026 11 PM PDT           32.80           1071         0              Normal
  03/30/2026 12 AM PDT           32.80           1071         0              Normal
  03/30/2026 01 AM PDT           32.80           1071         0              Normal
  03/30/2026 02 AM PDT           32.80           1071         0              Normal
  03/30/2026 03 AM PDT           32.81           1075         +              Normal
  03/30/2026 04 AM PDT           32.80           1071         -              Normal
  03/30/2026 05 AM PDT           32.82           1079         +              Normal
  03/30/2026 06 AM PDT           32.83           1083         +              Normal
  03/30/2026 07 AM PDT           32.82           1079         -              Normal
  03/30/2026 08 AM PDT           32.83           1083         +              Normal
  03/30/2026 09 AM PDT           32.85           1091         +              Normal
  03/30/2026 10 AM PDT           32.85           1091         0              Normal
  03/30/2026 11 AM PDT           32.87           1099         +              Normal
  03/30/2026 12 PM PDT           32.88           1103         +              Normal
  03/30/2026 01 PM PDT           32.88           1103         0              Normal
  03/30/2026 02 PM PDT           32.86           1095         -              Normal
  03/30/2026 03 PM PDT           32.87           1099         +              Normal
  03/30/2026 04 PM PDT           32.86           1095         -              Normal
  03/30/2026 05 PM PDT           32.85           1091         -              Normal
  03/30/2026 06 PM PDT           32.85           1091         0              Normal
  03/30/2026 07 PM PDT           32.84           1087         -              Normal
  03/30/2026 08 PM PDT           32.82           1079         -              Normal
  03/30/2026 09 PM PDT           32.82           1079         0              Normal
  03/30/2026 10 PM PDT           32.82           1079         0              Normal
  03/30/2026 11 PM PDT           32.80           1071         -              Normal
  03/31/2026 12 AM PDT           32.79           1067         -              Normal
  03/31/2026 01 AM PDT           32.78           1064         -              Normal
  03/31/2026 02 AM PDT           32.76           1056         -              Normal
  03/31/2026 03 AM PDT           32.77           1060         +              Normal
  03/31/2026 04 AM PDT           32.76           1056         -              Normal
  03/31/2026 05 AM PDT           32.75           1052         -              Normal
  03/31/2026 06 AM PDT           32.75           1052         0              Normal
  03/31/2026 07 AM PDT           32.75           1052         0              Normal
  03/31/2026 08 AM PDT           32.75           1052         0              Normal
  03/31/2026 09 AM PDT           32.74           1048         -              Normal
  03/31/2026 10 AM PDT           32.75           1052         +              Normal
  03/31/2026 11 AM PDT           32.75           1052         0              Normal
  03/31/2026 12 PM PDT           32.75           1052         0              Normal
  03/31/2026 01 PM PDT           32.73           1044         -              Normal
  03/31/2026 02 PM PDT           32.73           1044         0              Normal
  03/31/2026 03 PM PDT           32.71           1037         -              Normal
  03/31/2026 04 PM PDT           32.72           1041         +              Normal
  03/31/2026 05 PM PDT           32.70           1033         -              Normal
  03/31/2026 06 PM PDT           32.68           1025         -              Normal
  03/31/2026 07 PM PDT           32.70           1033         +              Normal
  03/31/2026 08 PM PDT           32.67           1021         -              Normal
  03/31/2026 09 PM PDT           32.68           1025         +              Normal
  03/31/2026 10 PM PDT           32.68           1025         0              Normal
  03/31/2026 11 PM PDT           32.67           1021         -              Normal
  04/01/2026 12 AM PDT           32.68           1025         +              Normal
  04/01/2026 01 AM PDT           32.68           1025         0              Normal
  04/01/2026 02 AM PDT           32.69           1029         +              Normal
  04/01/2026 03 AM PDT           32.70           1033         +              Normal
  04/01/2026 04 AM PDT           32.70           1033         0              Normal
  04/01/2026 05 AM PDT           32.69           1029         -              Normal
  04/01/2026 06 AM PDT           32.69           1029         0              Normal
  04/01/2026 07 AM PDT           32.68           1025         -              Normal
  04/01/2026 08 AM PDT           32.69           1029         +              Normal
  04/01/2026 09 AM PDT           32.68           1025         -              Normal
  04/01/2026 10 AM PDT           32.69           1029         +              Normal
  04/01/2026 11 AM PDT           32.69           1029         0              Normal
  04/01/2026 12 PM PDT           32.74           1048         +              Normal
  04/01/2026 01 PM PDT           32.74           1048         0              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  04/01/2026 02 PM PDT           32.75           1052                        Normal
  04/01/2026 03 PM PDT           32.75           1052         0              Normal
  04/01/2026 04 PM PDT           32.75           1052         0              Normal
  04/01/2026 05 PM PDT           32.76           1056         +              Normal
  04/01/2026 06 PM PDT           32.76           1056         0              Normal
  04/01/2026 07 PM PDT           32.76           1056         0              Normal
  04/01/2026 08 PM PDT           32.76           1056         0              Normal
  04/01/2026 09 PM PDT           32.76           1056         0              Normal
  04/01/2026 10 PM PDT           32.76           1056         0              Normal
  04/01/2026 11 PM PDT           32.76           1056         0              Normal
  04/02/2026 12 AM PDT           32.77           1060         +              Normal
  04/02/2026 01 AM PDT           32.77           1060         0              Normal
  04/02/2026 02 AM PDT           32.77           1060         0              Normal
  04/02/2026 03 AM PDT           32.77           1060         0              Normal
  04/02/2026 04 AM PDT           32.77           1060         0              Normal
  04/02/2026 05 AM PDT           32.77           1060         0              Normal
  04/02/2026 06 AM PDT           32.77           1060         0              Normal
  04/02/2026 07 AM PDT           32.77           1060         0              Normal
  04/02/2026 08 AM PDT           32.78           1064         +              Normal
  04/02/2026 09 AM PDT           32.78           1064         0              Normal
  04/02/2026 10 AM PDT           32.78           1064         0              Normal
  04/02/2026 11 AM PDT           32.78           1064         0              Normal
  04/02/2026 12 PM PDT           32.78           1064         0              Normal
  04/02/2026 01 PM PDT           32.78           1064         0              Normal
  04/02/2026 02 PM PDT           32.78           1064         0              Normal
  04/02/2026 03 PM PDT           32.78           1064         0              Normal
  04/02/2026 04 PM PDT           32.78           1064         0              Normal
  04/02/2026 05 PM PDT           32.78           1064         0              Normal
  04/02/2026 06 PM PDT           32.78           1064         0              Normal
  04/02/2026 07 PM PDT           32.78           1064         0              Normal
  04/02/2026 08 PM PDT           32.78           1064         0              Normal
  04/02/2026 09 PM PDT           32.78           1064         0              Normal
  04/02/2026 10 PM PDT           32.78           1064         0              Normal
  04/02/2026 11 PM PDT           32.78           1064         0              Normal
  04/03/2026 12 AM PDT           32.78           1064         0              Normal
  04/03/2026 01 AM PDT           32.78           1064         0              Normal
  04/03/2026 02 AM PDT           32.78           1064         0              Normal
  04/03/2026 03 AM PDT           32.78           1064         0              Normal
  04/03/2026 04 AM PDT           32.78           1064         0              Normal
  04/03/2026 05 AM PDT           32.78           1064         0              Normal
  04/03/2026 06 AM PDT           32.77           1060         -              Normal
  04/03/2026 07 AM PDT           32.77           1060         0              Normal
  04/03/2026 08 AM PDT           32.77           1060         0              Normal
  04/03/2026 09 AM PDT           32.77           1060         0              Normal
  04/03/2026 10 AM PDT           32.77           1060         0              Normal
  04/03/2026 11 AM PDT           32.76           1056         -              Normal
  04/03/2026 12 PM PDT           32.76           1056         0              Normal
  04/03/2026 01 PM PDT           32.76           1056         0              Normal
  04/03/2026 02 PM PDT           32.75           1052         -              Normal
  04/03/2026 03 PM PDT           32.75           1052         0              Normal
  04/03/2026 04 PM PDT           32.75           1052         0              Normal
  04/03/2026 05 PM PDT           32.74           1048         -              Normal
  04/03/2026 06 PM PDT           32.74           1048         0              Normal
  04/03/2026 07 PM PDT           32.74           1048         0              Normal
  04/03/2026 08 PM PDT           32.73           1044         -              Normal
  04/03/2026 09 PM PDT           32.73           1044         0              Normal
  04/03/2026 10 PM PDT           32.72           1041         -              Normal
  04/03/2026 11 PM PDT           32.72           1041         0              Normal
  04/04/2026 12 AM PDT           32.71           1037         -              Normal
  04/04/2026 01 AM PDT           32.71           1037         0              Normal
  04/04/2026 02 AM PDT           32.70           1033         -              Normal
  04/04/2026 03 AM PDT           32.70           1033         0              Normal
  04/04/2026 04 AM PDT           32.70           1033         0              Normal
  04/04/2026 05 AM PDT           32.69           1029         -              Normal
  04/04/2026 06 AM PDT           32.69           1029         0              Normal
  04/04/2026 07 AM PDT           32.68           1025         -              Normal
  04/04/2026 08 AM PDT           32.68           1025         0              Normal
  04/04/2026 09 AM PDT           32.67           1021         -              Normal
  04/04/2026 10 AM PDT           32.67           1021         0              Normal
  04/04/2026 11 AM PDT           32.66           1018         -              Normal
  04/04/2026 12 PM PDT           32.66           1018         0              Normal
  04/04/2026 01 PM PDT           32.65           1014         -              Normal
  04/04/2026 02 PM PDT           32.65           1014         0              Normal
  04/04/2026 03 PM PDT           32.65           1014         0              Normal
  04/04/2026 04 PM PDT           32.64           1010         -              Normal
  04/04/2026 05 PM PDT           32.64           1010         0              Normal
  04/04/2026 06 PM PDT           32.63           1006         -              Normal
  04/04/2026 07 PM PDT           32.63           1006         0              Normal
  04/04/2026 08 PM PDT           32.62           1003         -              Normal
  04/04/2026 09 PM PDT           32.62           1003         0              Normal
  04/04/2026 10 PM PDT           32.61            999         -              Normal
  04/04/2026 11 PM PDT           32.61            999         0              Normal
  04/05/2026 12 AM PDT           32.60            995         -              Normal
  04/05/2026 01 AM PDT           32.60            995         0              Normal
  04/05/2026 02 AM PDT           32.60            995         0              Normal
  04/05/2026 03 AM PDT           32.59            991         -              Normal
  04/05/2026 04 AM PDT           32.59            991         0              Normal
  04/05/2026 05 AM PDT           32.58            987         -              Normal
  04/05/2026 06 AM PDT           32.58            987         0              Normal
  04/05/2026 07 AM PDT           32.58            987         0              Normal
  04/05/2026 08 AM PDT           32.57            983         -              Normal
  04/05/2026 09 AM PDT           32.57            983         0              Normal
  04/05/2026 10 AM PDT           32.56            980         -              Normal
  04/05/2026 11 AM PDT           32.56            980         0              Normal
  04/05/2026 12 PM PDT           32.55            976         -              Normal
  04/05/2026 01 PM PDT           32.55            976         0              Normal
  04/05/2026 02 PM PDT           32.55            976         0              Normal
  04/05/2026 03 PM PDT           32.54            972         -              Normal
  04/05/2026 04 PM PDT           32.54            972         0              Normal
  04/05/2026 05 PM PDT           32.54            972         0              Normal
  04/05/2026 06 PM PDT           32.53            968         -              Normal
  04/05/2026 07 PM PDT           32.53            968         0              Normal
  04/05/2026 08 PM PDT           32.53            968         0              Normal
  04/05/2026 09 PM PDT           32.52            964         -              Normal
  04/05/2026 10 PM PDT           32.52            964         0              Normal
  04/05/2026 11 PM PDT           32.52            964         0              Normal
  04/06/2026 12 AM PDT           32.51            961         -              Normal
  04/06/2026 01 AM PDT           32.51            961         0              Normal
  04/06/2026 02 AM PDT           32.51            961         0              Normal
  04/06/2026 03 AM PDT           32.50            957         -              Normal
  04/06/2026 04 AM PDT           32.50            957         0              Normal
  04/06/2026 05 AM PDT           32.50            957         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.