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

 | 

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 09 2026 at 7:47 AM PDTNext Issuance: May 10 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:  05/09/2026 at 07:47 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  05/04/2026 at 08:00 AM PDT
# Maximum Observed Stage:                       32.32 Feet
# Maximum Observed Flow:                        721 cfs
#
# Earliest Date & Time of Maximum Forecast:     05/09/2026 at 08:00 AM PDT
# Maximum Forecast Stage:                       31.97 Feet
# Maximum Forecast Flow:                        613 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  05/04/2026 07 AM PDT           32.32            721                        Normal
  05/04/2026 08 AM PDT           32.32            721         0              Normal
  05/04/2026 09 AM PDT           32.31            718         -              Normal
  05/04/2026 10 AM PDT           32.31            718         0              Normal
  05/04/2026 11 AM PDT           32.30            715         -              Normal
  05/04/2026 12 PM PDT           32.30            715         0              Normal
  05/04/2026 01 PM PDT           32.30            715         0              Normal
  05/04/2026 02 PM PDT           32.30            715         0              Normal
  05/04/2026 03 PM PDT           32.30            715         0              Normal
  05/04/2026 04 PM PDT           32.30            715         0              Normal
  05/04/2026 05 PM PDT           32.29            711         -              Normal
  05/04/2026 06 PM PDT           32.30            715         +              Normal
  05/04/2026 07 PM PDT           32.29            711         -              Normal
  05/04/2026 08 PM PDT           32.29            711         0              Normal
  05/04/2026 09 PM PDT           32.29            711         0              Normal
  05/04/2026 10 PM PDT           32.28            708         -              Normal
  05/04/2026 11 PM PDT           32.28            708         0              Normal
  05/05/2026 12 AM PDT           32.28            708         0              Normal
  05/05/2026 01 AM PDT           32.28            708         0              Normal
  05/05/2026 02 AM PDT           32.28            708         0              Normal
  05/05/2026 03 AM PDT           32.27            705         -              Normal
  05/05/2026 04 AM PDT           32.26            701         -              Normal
  05/05/2026 05 AM PDT           32.26            701         0              Normal
  05/05/2026 06 AM PDT           32.26            701         0              Normal
  05/05/2026 07 AM PDT           32.26            701         0              Normal
  05/05/2026 08 AM PDT           32.26            701         0              Normal
  05/05/2026 09 AM PDT           32.25            698         -              Normal
  05/05/2026 10 AM PDT           32.25            698         0              Normal
  05/05/2026 11 AM PDT           32.25            698         0              Normal
  05/05/2026 12 PM PDT           32.24            695         -              Normal
  05/05/2026 01 PM PDT           32.24            695         0              Normal
  05/05/2026 02 PM PDT           32.24            695         0              Normal
  05/05/2026 03 PM PDT           32.23            691         -              Normal
  05/05/2026 04 PM PDT           32.23            691         0              Normal
  05/05/2026 05 PM PDT           32.23            691         0              Normal
  05/05/2026 06 PM PDT           32.22            688         -              Normal
  05/05/2026 07 PM PDT           32.22            688         0              Normal
  05/05/2026 08 PM PDT           32.21            685         -              Normal
  05/05/2026 09 PM PDT           32.21            685         0              Normal
  05/05/2026 10 PM PDT           32.21            685         0              Normal
  05/05/2026 11 PM PDT           32.21            685         0              Normal
  05/06/2026 12 AM PDT           32.20            682         -              Normal
  05/06/2026 01 AM PDT           32.20            682         0              Normal
  05/06/2026 02 AM PDT           32.20            682         0              Normal
  05/06/2026 03 AM PDT           32.20            682         0              Normal
  05/06/2026 04 AM PDT           32.20            682         0              Normal
  05/06/2026 05 AM PDT           32.19            678         -              Normal
  05/06/2026 06 AM PDT           32.19            678         0              Normal
  05/06/2026 07 AM PDT           32.19            678         0              Normal
  05/06/2026 08 AM PDT           32.18            675         -              Normal
  05/06/2026 09 AM PDT           32.17            672         -              Normal
  05/06/2026 10 AM PDT           32.17            672         0              Normal
  05/06/2026 11 AM PDT           32.14            663         -              Normal
  05/06/2026 12 PM PDT           32.12            657         -              Normal
  05/06/2026 01 PM PDT           32.12            657         0              Normal
  05/06/2026 02 PM PDT           32.14            663         +              Normal
  05/06/2026 03 PM PDT           32.14            663         0              Normal
  05/06/2026 04 PM PDT           32.13            660         -              Normal
  05/06/2026 05 PM PDT           32.12            657         -              Normal
  05/06/2026 06 PM PDT           32.11            654         -              Normal
  05/06/2026 07 PM PDT           32.10            651         -              Normal
  05/06/2026 08 PM PDT           32.09            648         -              Normal
  05/06/2026 09 PM PDT           32.08            645         -              Normal
  05/06/2026 10 PM PDT           32.07            642         -              Normal
  05/06/2026 11 PM PDT           32.06            639         -              Normal
  05/07/2026 12 AM PDT           32.04            633         -              Normal
  05/07/2026 01 AM PDT           32.03            630         -              Normal
  05/07/2026 02 AM PDT           32.03            630         0              Normal
  05/07/2026 03 AM PDT           32.01            624         -              Normal
  05/07/2026 04 AM PDT           32.00            622         -              Normal
  05/07/2026 05 AM PDT           32.00            622         0              Normal
  05/07/2026 06 AM PDT           32.00            622         0              Normal
  05/07/2026 07 AM PDT           31.99            619         -              Normal
  05/07/2026 08 AM PDT           31.98            616         -              Normal
  05/07/2026 09 AM PDT           32.00            622         +              Normal
  05/07/2026 10 AM PDT           31.99            619         -              Normal
  05/07/2026 11 AM PDT           32.00            622         +              Normal
  05/07/2026 12 PM PDT           32.00            622         0              Normal
  05/07/2026 01 PM PDT           32.00            622         0              Normal
  05/07/2026 02 PM PDT           31.99            619         -              Normal
  05/07/2026 03 PM PDT           32.00            622         +              Normal
  05/07/2026 04 PM PDT           31.99            619         -              Normal
  05/07/2026 05 PM PDT           32.00            622         +              Normal
  05/07/2026 06 PM PDT           32.00            622         0              Normal
  05/07/2026 07 PM PDT           31.97            613         -              Normal
  05/07/2026 08 PM PDT           31.99            619         +              Normal
  05/07/2026 09 PM PDT           31.98            616         -              Normal
  05/07/2026 10 PM PDT           31.97            613         -              Normal
  05/07/2026 11 PM PDT           31.97            613         0              Normal
  05/08/2026 12 AM PDT           31.97            613         0              Normal
  05/08/2026 01 AM PDT           31.96            610         -              Normal
  05/08/2026 02 AM PDT           31.95            607         -              Normal
  05/08/2026 03 AM PDT           31.95            607         0              Normal
  05/08/2026 04 AM PDT           31.96            610         +              Normal
  05/08/2026 05 AM PDT           31.96            610         0              Normal
  05/08/2026 06 AM PDT           31.95            607         -              Normal
  05/08/2026 07 AM PDT           31.96            610         +              Normal
  05/08/2026 08 AM PDT           31.97            613         +              Normal
  05/08/2026 09 AM PDT           31.96            610         -              Normal
  05/08/2026 10 AM PDT           31.98            616         +              Normal
  05/08/2026 11 AM PDT           31.95            607         -              Normal
  05/08/2026 12 PM PDT           31.98            616         +              Normal
  05/08/2026 01 PM PDT           31.98            616         0              Normal
  05/08/2026 02 PM PDT           31.97            613         -              Normal
  05/08/2026 03 PM PDT           31.97            613         0              Normal
  05/08/2026 04 PM PDT           31.98            616         +              Normal
  05/08/2026 05 PM PDT           31.97            613         -              Normal
  05/08/2026 06 PM PDT           31.98            616         +              Normal
  05/08/2026 07 PM PDT           31.98            616         0              Normal
  05/08/2026 08 PM PDT           31.97            613         -              Normal
  05/08/2026 09 PM PDT           31.98            616         +              Normal
  05/08/2026 10 PM PDT           31.96            610         -              Normal
  05/08/2026 11 PM PDT           31.97            613         +              Normal
  05/09/2026 12 AM PDT           31.96            610         -              Normal
  05/09/2026 01 AM PDT           31.96            610         0              Normal
  05/09/2026 02 AM PDT           31.97            613         +              Normal
  05/09/2026 03 AM PDT           31.96            610         -              Normal
  05/09/2026 04 AM PDT           31.97            613         +              Normal
  05/09/2026 05 AM PDT           31.97            613         0              Normal
  05/09/2026 06 AM PDT           31.98            616         +              Normal
  05/09/2026 07 AM PDT           31.98            616         0              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  05/09/2026 08 AM PDT           31.97            613                        Normal
  05/09/2026 09 AM PDT           31.97            613         0              Normal
  05/09/2026 10 AM PDT           31.96            610         -              Normal
  05/09/2026 11 AM PDT           31.96            610         0              Normal
  05/09/2026 12 PM PDT           31.96            610         0              Normal
  05/09/2026 01 PM PDT           31.95            607         -              Normal
  05/09/2026 02 PM PDT           31.95            607         0              Normal
  05/09/2026 03 PM PDT           31.95            607         0              Normal
  05/09/2026 04 PM PDT           31.94            604         -              Normal
  05/09/2026 05 PM PDT           31.94            604         0              Normal
  05/09/2026 06 PM PDT           31.94            604         0              Normal
  05/09/2026 07 PM PDT           31.94            604         0              Normal
  05/09/2026 08 PM PDT           31.93            601         -              Normal
  05/09/2026 09 PM PDT           31.93            601         0              Normal
  05/09/2026 10 PM PDT           31.93            601         0              Normal
  05/09/2026 11 PM PDT           31.93            601         0              Normal
  05/10/2026 12 AM PDT           31.93            601         0              Normal
  05/10/2026 01 AM PDT           31.93            601         0              Normal
  05/10/2026 02 AM PDT           31.93            601         0              Normal
  05/10/2026 03 AM PDT           31.93            601         0              Normal
  05/10/2026 04 AM PDT           31.92            598         -              Normal
  05/10/2026 05 AM PDT           31.92            598         0              Normal
  05/10/2026 06 AM PDT           31.92            598         0              Normal
  05/10/2026 07 AM PDT           31.92            598         0              Normal
  05/10/2026 08 AM PDT           31.92            598         0              Normal
  05/10/2026 09 AM PDT           31.92            598         0              Normal
  05/10/2026 10 AM PDT           31.92            598         0              Normal
  05/10/2026 11 AM PDT           31.92            598         0              Normal
  05/10/2026 12 PM PDT           31.92            598         0              Normal
  05/10/2026 01 PM PDT           31.92            598         0              Normal
  05/10/2026 02 PM PDT           31.92            598         0              Normal
  05/10/2026 03 PM PDT           31.92            598         0              Normal
  05/10/2026 04 PM PDT           31.92            598         0              Normal
  05/10/2026 05 PM PDT           31.92            598         0              Normal
  05/10/2026 06 PM PDT           31.92            598         0              Normal
  05/10/2026 07 PM PDT           31.92            598         0              Normal
  05/10/2026 08 PM PDT           31.92            598         0              Normal
  05/10/2026 09 PM PDT           31.92            598         0              Normal
  05/10/2026 10 PM PDT           31.92            598         0              Normal
  05/10/2026 11 PM PDT           31.92            598         0              Normal
  05/11/2026 12 AM PDT           31.92            598         0              Normal
  05/11/2026 01 AM PDT           31.92            598         0              Normal
  05/11/2026 02 AM PDT           31.92            598         0              Normal
  05/11/2026 03 AM PDT           31.92            598         0              Normal
  05/11/2026 04 AM PDT           31.92            598         0              Normal
  05/11/2026 05 AM PDT           31.92            598         0              Normal
  05/11/2026 06 AM PDT           31.92            598         0              Normal
  05/11/2026 07 AM PDT           31.92            598         0              Normal
  05/11/2026 08 AM PDT           31.92            598         0              Normal
  05/11/2026 09 AM PDT           31.92            598         0              Normal
  05/11/2026 10 AM PDT           31.92            598         0              Normal
  05/11/2026 11 AM PDT           31.92            598         0              Normal
  05/11/2026 12 PM PDT           31.92            598         0              Normal
  05/11/2026 01 PM PDT           31.92            598         0              Normal
  05/11/2026 02 PM PDT           31.92            598         0              Normal
  05/11/2026 03 PM PDT           31.92            598         0              Normal
  05/11/2026 04 PM PDT           31.92            598         0              Normal
  05/11/2026 05 PM PDT           31.92            598         0              Normal
  05/11/2026 06 PM PDT           31.92            598         0              Normal
  05/11/2026 07 PM PDT           31.92            598         0              Normal
  05/11/2026 08 PM PDT           31.92            598         0              Normal
  05/11/2026 09 PM PDT           31.92            598         0              Normal
  05/11/2026 10 PM PDT           31.92            598         0              Normal
  05/11/2026 11 PM PDT           31.92            598         0              Normal
  05/12/2026 12 AM PDT           31.92            598         0              Normal
  05/12/2026 01 AM PDT           31.92            598         0              Normal
  05/12/2026 02 AM PDT           31.92            598         0              Normal
  05/12/2026 03 AM PDT           31.92            598         0              Normal
  05/12/2026 04 AM PDT           31.92            598         0              Normal
  05/12/2026 05 AM PDT           31.92            598         0              Normal
  05/12/2026 06 AM PDT           31.92            598         0              Normal
  05/12/2026 07 AM PDT           31.92            598         0              Normal
  05/12/2026 08 AM PDT           31.92            598         0              Normal
  05/12/2026 09 AM PDT           31.92            598         0              Normal
  05/12/2026 10 AM PDT           31.92            598         0              Normal
  05/12/2026 11 AM PDT           31.92            598         0              Normal
  05/12/2026 12 PM PDT           31.92            598         0              Normal
  05/12/2026 01 PM PDT           31.92            598         0              Normal
  05/12/2026 02 PM PDT           31.92            598         0              Normal
  05/12/2026 03 PM PDT           31.92            598         0              Normal
  05/12/2026 04 PM PDT           31.92            598         0              Normal
  05/12/2026 05 PM PDT           31.92            598         0              Normal
  05/12/2026 06 PM PDT           31.92            598         0              Normal
  05/12/2026 07 PM PDT           31.92            598         0              Normal
  05/12/2026 08 PM PDT           31.92            598         0              Normal
  05/12/2026 09 PM PDT           31.92            598         0              Normal
  05/12/2026 10 PM PDT           31.92            598         0              Normal
  05/12/2026 11 PM PDT           31.92            598         0              Normal
  05/13/2026 12 AM PDT           31.92            598         0              Normal
  05/13/2026 01 AM PDT           31.92            598         0              Normal
  05/13/2026 02 AM PDT           31.92            598         0              Normal
  05/13/2026 03 AM PDT           31.91            595         -              Normal
  05/13/2026 04 AM PDT           31.91            595         0              Normal
  05/13/2026 05 AM PDT           31.91            595         0              Normal
  05/13/2026 06 AM PDT           31.91            595         0              Normal
  05/13/2026 07 AM PDT           31.91            595         0              Normal
  05/13/2026 08 AM PDT           31.91            595         0              Normal
  05/13/2026 09 AM PDT           31.91            595         0              Normal
  05/13/2026 10 AM PDT           31.91            595         0              Normal
  05/13/2026 11 AM PDT           31.91            595         0              Normal
  05/13/2026 12 PM PDT           31.91            595         0              Normal
  05/13/2026 01 PM PDT           31.91            595         0              Normal
  05/13/2026 02 PM PDT           31.91            595         0              Normal
  05/13/2026 03 PM PDT           31.91            595         0              Normal
  05/13/2026 04 PM PDT           31.91            595         0              Normal
  05/13/2026 05 PM PDT           31.91            595         0              Normal
  05/13/2026 06 PM PDT           31.90            593         -              Normal
  05/13/2026 07 PM PDT           31.90            593         0              Normal
  05/13/2026 08 PM PDT           31.90            593         0              Normal
  05/13/2026 09 PM PDT           31.90            593         0              Normal
  05/13/2026 10 PM PDT           31.90            593         0              Normal
  05/13/2026 11 PM PDT           31.90            593         0              Normal
  05/14/2026 12 AM PDT           31.90            593         0              Normal
  05/14/2026 01 AM PDT           31.90            593         0              Normal
  05/14/2026 02 AM PDT           31.90            593         0              Normal
  05/14/2026 03 AM PDT           31.90            593         0              Normal
  05/14/2026 04 AM PDT           31.90            593         0              Normal
  05/14/2026 05 AM PDT           31.89            590         -              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.