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: May 08 2026 at 8:57 AM PDTNext Issuance: May 09 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:  05/08/2026 at 08:57 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  05/03/2026 at 02:00 PM PDT
# Maximum Observed Stage:                       32.35 Feet
# Maximum Observed Flow:                        1014 cfs
#
# Earliest Date & Time of Maximum Forecast:     05/08/2026 at 02:00 PM PDT
# Maximum Forecast Stage:                       31.98 Feet
# Maximum Forecast Flow:                        875 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  05/03/2026 08 AM PDT           32.30            995                        Normal
  05/03/2026 09 AM PDT           32.30            995         0              Normal
  05/03/2026 10 AM PDT           32.31            999         +              Normal
  05/03/2026 11 AM PDT           32.33           1006         +              Normal
  05/03/2026 12 PM PDT           32.33           1006         0              Normal
  05/03/2026 01 PM PDT           32.34           1010         +              Normal
  05/03/2026 02 PM PDT           32.35           1014         +              Normal
  05/03/2026 03 PM PDT           32.34           1010         -              Normal
  05/03/2026 04 PM PDT           32.34           1010         0              Normal
  05/03/2026 05 PM PDT           32.34           1010         0              Normal
  05/03/2026 06 PM PDT           32.33           1006         -              Normal
  05/03/2026 07 PM PDT           32.34           1010         +              Normal
  05/03/2026 08 PM PDT           32.33           1006         -              Normal
  05/03/2026 09 PM PDT           32.33           1006         0              Normal
  05/03/2026 10 PM PDT           32.33           1006         0              Normal
  05/03/2026 11 PM PDT           32.32           1003         -              Normal
  05/04/2026 12 AM PDT           32.32           1003         0              Normal
  05/04/2026 01 AM PDT           32.33           1006         +              Normal
  05/04/2026 02 AM PDT           32.34           1010         +              Normal
  05/04/2026 03 AM PDT           32.32           1003         -              Normal
  05/04/2026 04 AM PDT           32.32           1003         0              Normal
  05/04/2026 05 AM PDT           32.31            999         -              Normal
  05/04/2026 06 AM PDT           32.32           1003         +              Normal
  05/04/2026 07 AM PDT           32.32           1003         0              Normal
  05/04/2026 08 AM PDT           32.32           1003         0              Normal
  05/04/2026 09 AM PDT           32.31            999         -              Normal
  05/04/2026 10 AM PDT           32.31            999         0              Normal
  05/04/2026 11 AM PDT           32.30            995         -              Normal
  05/04/2026 12 PM PDT           32.30            995         0              Normal
  05/04/2026 01 PM PDT           32.30            995         0              Normal
  05/04/2026 02 PM PDT           32.30            995         0              Normal
  05/04/2026 03 PM PDT           32.30            995         0              Normal
  05/04/2026 04 PM PDT           32.30            995         0              Normal
  05/04/2026 05 PM PDT           32.29            991         -              Normal
  05/04/2026 06 PM PDT           32.30            995         +              Normal
  05/04/2026 07 PM PDT           32.29            991         -              Normal
  05/04/2026 08 PM PDT           32.29            991         0              Normal
  05/04/2026 09 PM PDT           32.29            991         0              Normal
  05/04/2026 10 PM PDT           32.28            987         -              Normal
  05/04/2026 11 PM PDT           32.28            987         0              Normal
  05/05/2026 12 AM PDT           32.28            987         0              Normal
  05/05/2026 01 AM PDT           32.28            987         0              Normal
  05/05/2026 02 AM PDT           32.28            987         0              Normal
  05/05/2026 03 AM PDT           32.27            983         -              Normal
  05/05/2026 04 AM PDT           32.26            980         -              Normal
  05/05/2026 05 AM PDT           32.26            980         0              Normal
  05/05/2026 06 AM PDT           32.26            980         0              Normal
  05/05/2026 07 AM PDT           32.26            980         0              Normal
  05/05/2026 08 AM PDT           32.26            980         0              Normal
  05/05/2026 09 AM PDT           32.25            976         -              Normal
  05/05/2026 10 AM PDT           32.25            976         0              Normal
  05/05/2026 11 AM PDT           32.25            976         0              Normal
  05/05/2026 12 PM PDT           32.24            972         -              Normal
  05/05/2026 01 PM PDT           32.24            972         0              Normal
  05/05/2026 02 PM PDT           32.24            972         0              Normal
  05/05/2026 03 PM PDT           32.23            968         -              Normal
  05/05/2026 04 PM PDT           32.23            968         0              Normal
  05/05/2026 05 PM PDT           32.23            968         0              Normal
  05/05/2026 06 PM PDT           32.22            964         -              Normal
  05/05/2026 07 PM PDT           32.22            964         0              Normal
  05/05/2026 08 PM PDT           32.21            961         -              Normal
  05/05/2026 09 PM PDT           32.21            961         0              Normal
  05/05/2026 10 PM PDT           32.21            961         0              Normal
  05/05/2026 11 PM PDT           32.21            961         0              Normal
  05/06/2026 12 AM PDT           32.20            957         -              Normal
  05/06/2026 01 AM PDT           32.20            957         0              Normal
  05/06/2026 02 AM PDT           32.20            957         0              Normal
  05/06/2026 03 AM PDT           32.20            957         0              Normal
  05/06/2026 04 AM PDT           32.20            957         0              Normal
  05/06/2026 05 AM PDT           32.19            953         -              Normal
  05/06/2026 06 AM PDT           32.19            953         0              Normal
  05/06/2026 07 AM PDT           32.19            953         0              Normal
  05/06/2026 08 AM PDT           32.18            949         -              Normal
  05/06/2026 09 AM PDT           32.17            946         -              Normal
  05/06/2026 10 AM PDT           32.17            946         0              Normal
  05/06/2026 11 AM PDT           32.14            934         -              Normal
  05/06/2026 12 PM PDT           32.12            927         -              Normal
  05/06/2026 01 PM PDT           32.12            927         0              Normal
  05/06/2026 02 PM PDT           32.14            934         +              Normal
  05/06/2026 03 PM PDT           32.14            934         0              Normal
  05/06/2026 04 PM PDT           32.13            931         -              Normal
  05/06/2026 05 PM PDT           32.12            927         -              Normal
  05/06/2026 06 PM PDT           32.11            923         -              Normal
  05/06/2026 07 PM PDT           32.10            919         -              Normal
  05/06/2026 08 PM PDT           32.09            916         -              Normal
  05/06/2026 09 PM PDT           32.08            912         -              Normal
  05/06/2026 10 PM PDT           32.07            908         -              Normal
  05/06/2026 11 PM PDT           32.06            905         -              Normal
  05/07/2026 12 AM PDT           32.04            897         -              Normal
  05/07/2026 01 AM PDT           32.03            893         -              Normal
  05/07/2026 02 AM PDT           32.03            893         0              Normal
  05/07/2026 03 AM PDT           32.01            886         -              Normal
  05/07/2026 04 AM PDT           32.00            883         -              Normal
  05/07/2026 05 AM PDT           32.00            883         0              Normal
  05/07/2026 06 AM PDT           32.00            883         0              Normal
  05/07/2026 07 AM PDT           31.99            879         -              Normal
  05/07/2026 08 AM PDT           31.98            875         -              Normal
  05/07/2026 09 AM PDT           32.00            883         +              Normal
  05/07/2026 10 AM PDT           31.99            879         -              Normal
  05/07/2026 11 AM PDT           32.00            883         +              Normal
  05/07/2026 12 PM PDT           32.00            883         0              Normal
  05/07/2026 01 PM PDT           32.00            883         0              Normal
  05/07/2026 02 PM PDT           31.99            879         -              Normal
  05/07/2026 03 PM PDT           32.00            883         +              Normal
  05/07/2026 04 PM PDT           31.99            879         -              Normal
  05/07/2026 05 PM PDT           32.00            883         +              Normal
  05/07/2026 06 PM PDT           32.00            883         0              Normal
  05/07/2026 07 PM PDT           31.97            872         -              Normal
  05/07/2026 08 PM PDT           31.99            879         +              Normal
  05/07/2026 09 PM PDT           31.98            875         -              Normal
  05/07/2026 10 PM PDT           31.97            872         -              Normal
  05/07/2026 11 PM PDT           31.97            872         0              Normal
  05/08/2026 12 AM PDT           31.97            872         0              Normal
  05/08/2026 01 AM PDT           31.96            868         -              Normal
  05/08/2026 02 AM PDT           31.95            864         -              Normal
  05/08/2026 03 AM PDT           31.95            864         0              Normal
  05/08/2026 04 AM PDT           31.96            868         +              Normal
  05/08/2026 05 AM PDT           31.96            868         0              Normal
  05/08/2026 06 AM PDT           31.95            864         -              Normal
  05/08/2026 07 AM PDT           31.96            868         +              Normal
  05/08/2026 08 AM PDT           31.96            868         0              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  05/08/2026 09 AM PDT           31.97            872                        Normal
  05/08/2026 10 AM PDT           31.97            872         0              Normal
  05/08/2026 11 AM PDT           31.97            872         0              Normal
  05/08/2026 12 PM PDT           31.97            872         0              Normal
  05/08/2026 01 PM PDT           31.97            872         0              Normal
  05/08/2026 02 PM PDT           31.98            875         +              Normal
  05/08/2026 03 PM PDT           31.98            875         0              Normal
  05/08/2026 04 PM PDT           31.98            875         0              Normal
  05/08/2026 05 PM PDT           31.98            875         0              Normal
  05/08/2026 06 PM PDT           31.98            875         0              Normal
  05/08/2026 07 PM PDT           31.98            875         0              Normal
  05/08/2026 08 PM PDT           31.98            875         0              Normal
  05/08/2026 09 PM PDT           31.98            875         0              Normal
  05/08/2026 10 PM PDT           31.98            875         0              Normal
  05/08/2026 11 PM PDT           31.98            875         0              Normal
  05/09/2026 12 AM PDT           31.98            875         0              Normal
  05/09/2026 01 AM PDT           31.98            875         0              Normal
  05/09/2026 02 AM PDT           31.98            875         0              Normal
  05/09/2026 03 AM PDT           31.98            875         0              Normal
  05/09/2026 04 AM PDT           31.98            875         0              Normal
  05/09/2026 05 AM PDT           31.98            875         0              Normal
  05/09/2026 06 AM PDT           31.97            872         -              Normal
  05/09/2026 07 AM PDT           31.97            872         0              Normal
  05/09/2026 08 AM PDT           31.97            872         0              Normal
  05/09/2026 09 AM PDT           31.97            872         0              Normal
  05/09/2026 10 AM PDT           31.97            872         0              Normal
  05/09/2026 11 AM PDT           31.97            872         0              Normal
  05/09/2026 12 PM PDT           31.97            872         0              Normal
  05/09/2026 01 PM PDT           31.97            872         0              Normal
  05/09/2026 02 PM PDT           31.97            872         0              Normal
  05/09/2026 03 PM PDT           31.97            872         0              Normal
  05/09/2026 04 PM PDT           31.97            872         0              Normal
  05/09/2026 05 PM PDT           31.97            872         0              Normal
  05/09/2026 06 PM PDT           31.97            872         0              Normal
  05/09/2026 07 PM PDT           31.97            872         0              Normal
  05/09/2026 08 PM PDT           31.97            872         0              Normal
  05/09/2026 09 PM PDT           31.97            872         0              Normal
  05/09/2026 10 PM PDT           31.97            872         0              Normal
  05/09/2026 11 PM PDT           31.97            872         0              Normal
  05/10/2026 12 AM PDT           31.97            872         0              Normal
  05/10/2026 01 AM PDT           31.97            872         0              Normal
  05/10/2026 02 AM PDT           31.97            872         0              Normal
  05/10/2026 03 AM PDT           31.97            872         0              Normal
  05/10/2026 04 AM PDT           31.97            872         0              Normal
  05/10/2026 05 AM PDT           31.97            872         0              Normal
  05/10/2026 06 AM PDT           31.97            872         0              Normal
  05/10/2026 07 AM PDT           31.97            872         0              Normal
  05/10/2026 08 AM PDT           31.97            872         0              Normal
  05/10/2026 09 AM PDT           31.97            872         0              Normal
  05/10/2026 10 AM PDT           31.97            872         0              Normal
  05/10/2026 11 AM PDT           31.97            872         0              Normal
  05/10/2026 12 PM PDT           31.97            872         0              Normal
  05/10/2026 01 PM PDT           31.97            872         0              Normal
  05/10/2026 02 PM PDT           31.97            872         0              Normal
  05/10/2026 03 PM PDT           31.97            872         0              Normal
  05/10/2026 04 PM PDT           31.97            872         0              Normal
  05/10/2026 05 PM PDT           31.98            875         +              Normal
  05/10/2026 06 PM PDT           31.98            875         0              Normal
  05/10/2026 07 PM PDT           31.98            875         0              Normal
  05/10/2026 08 PM PDT           31.98            875         0              Normal
  05/10/2026 09 PM PDT           31.98            875         0              Normal
  05/10/2026 10 PM PDT           31.98            875         0              Normal
  05/10/2026 11 PM PDT           31.98            875         0              Normal
  05/11/2026 12 AM PDT           31.98            875         0              Normal
  05/11/2026 01 AM PDT           31.98            875         0              Normal
  05/11/2026 02 AM PDT           31.98            875         0              Normal
  05/11/2026 03 AM PDT           31.98            875         0              Normal
  05/11/2026 04 AM PDT           31.98            875         0              Normal
  05/11/2026 05 AM PDT           31.98            875         0              Normal
  05/11/2026 06 AM PDT           31.98            875         0              Normal
  05/11/2026 07 AM PDT           31.98            875         0              Normal
  05/11/2026 08 AM PDT           31.98            875         0              Normal
  05/11/2026 09 AM PDT           31.98            875         0              Normal
  05/11/2026 10 AM PDT           31.97            872         -              Normal
  05/11/2026 11 AM PDT           31.97            872         0              Normal
  05/11/2026 12 PM PDT           31.97            872         0              Normal
  05/11/2026 01 PM PDT           31.97            872         0              Normal
  05/11/2026 02 PM PDT           31.97            872         0              Normal
  05/11/2026 03 PM PDT           31.97            872         0              Normal
  05/11/2026 04 PM PDT           31.97            872         0              Normal
  05/11/2026 05 PM PDT           31.97            872         0              Normal
  05/11/2026 06 PM PDT           31.97            872         0              Normal
  05/11/2026 07 PM PDT           31.97            872         0              Normal
  05/11/2026 08 PM PDT           31.97            872         0              Normal
  05/11/2026 09 PM PDT           31.97            872         0              Normal
  05/11/2026 10 PM PDT           31.97            872         0              Normal
  05/11/2026 11 PM PDT           31.97            872         0              Normal
  05/12/2026 12 AM PDT           31.97            872         0              Normal
  05/12/2026 01 AM PDT           31.97            872         0              Normal
  05/12/2026 02 AM PDT           31.97            872         0              Normal
  05/12/2026 03 AM PDT           31.97            872         0              Normal
  05/12/2026 04 AM PDT           31.97            872         0              Normal
  05/12/2026 05 AM PDT           31.97            872         0              Normal
  05/12/2026 06 AM PDT           31.97            872         0              Normal
  05/12/2026 07 AM PDT           31.97            872         0              Normal
  05/12/2026 08 AM PDT           31.96            868         -              Normal
  05/12/2026 09 AM PDT           31.96            868         0              Normal
  05/12/2026 10 AM PDT           31.96            868         0              Normal
  05/12/2026 11 AM PDT           31.96            868         0              Normal
  05/12/2026 12 PM PDT           31.96            868         0              Normal
  05/12/2026 01 PM PDT           31.96            868         0              Normal
  05/12/2026 02 PM PDT           31.96            868         0              Normal
  05/12/2026 03 PM PDT           31.96            868         0              Normal
  05/12/2026 04 PM PDT           31.96            868         0              Normal
  05/12/2026 05 PM PDT           31.96            868         0              Normal
  05/12/2026 06 PM PDT           31.96            868         0              Normal
  05/12/2026 07 PM PDT           31.96            868         0              Normal
  05/12/2026 08 PM PDT           31.96            868         0              Normal
  05/12/2026 09 PM PDT           31.96            868         0              Normal
  05/12/2026 10 PM PDT           31.96            868         0              Normal
  05/12/2026 11 PM PDT           31.96            868         0              Normal
  05/13/2026 12 AM PDT           31.96            868         0              Normal
  05/13/2026 01 AM PDT           31.96            868         0              Normal
  05/13/2026 02 AM PDT           31.96            868         0              Normal
  05/13/2026 03 AM PDT           31.95            864         -              Normal
  05/13/2026 04 AM PDT           31.95            864         0              Normal
  05/13/2026 05 AM PDT           31.95            864         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.