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: Jul 23 2026 at 8:12 AM PDTNext Issuance: Jul 24 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:  07/23/2026 at 08:12 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  07/19/2026 at 04:00 PM PDT
# Maximum Observed Stage:                       30.70 Feet
# Maximum Observed Flow:                        477 cfs
#
# Earliest Date & Time of Maximum Forecast:     07/27/2026 at 08:00 AM PDT
# Maximum Forecast Stage:                       31.79 Feet
# Maximum Forecast Flow:                        807 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  07/18/2026 08 AM PDT           30.22            356                        Normal
  07/18/2026 09 AM PDT           30.27            368         +              Normal
  07/18/2026 10 AM PDT           30.34            385         +              Normal
  07/18/2026 11 AM PDT           30.38            395         +              Normal
  07/18/2026 12 PM PDT           30.43            407         +              Normal
  07/18/2026 01 PM PDT           30.45            412         +              Normal
  07/18/2026 02 PM PDT           30.48            420         +              Normal
  07/18/2026 03 PM PDT           30.52            430         +              Normal
  07/18/2026 04 PM PDT           30.53            433         +              Normal
  07/18/2026 05 PM PDT           30.55            438         +              Normal
  07/18/2026 06 PM PDT           30.55            438         0              Normal
  07/18/2026 07 PM PDT           30.54            435         -              Normal
  07/18/2026 08 PM PDT           30.55            438         +              Normal
  07/18/2026 09 PM PDT           30.54            435         -              Normal
  07/18/2026 10 PM PDT           30.52            430         -              Normal
  07/18/2026 11 PM PDT           30.51            428         -              Normal
  07/19/2026 12 AM PDT           30.51            428         0              Normal
  07/19/2026 01 AM PDT           30.49            423         -              Normal
  07/19/2026 02 AM PDT           30.48            420         -              Normal
  07/19/2026 03 AM PDT           30.49            423         +              Normal
  07/19/2026 04 AM PDT           30.49            423         0              Normal
  07/19/2026 05 AM PDT           30.50            425         +              Normal
  07/19/2026 06 AM PDT           30.51            428         +              Normal
  07/19/2026 07 AM PDT           30.52            430         +              Normal
  07/19/2026 08 AM PDT           30.53            433         +              Normal
  07/19/2026 09 AM PDT           30.53            433         0              Normal
  07/19/2026 10 AM PDT           30.56            440         +              Normal
  07/19/2026 11 AM PDT           30.60            451         +              Normal
  07/19/2026 12 PM PDT           30.64            461         +              Normal
  07/19/2026 01 PM PDT           30.69            474         +              Normal
  07/19/2026 02 PM PDT           30.69            474         0              Normal
  07/19/2026 03 PM PDT           30.69            474         0              Normal
  07/19/2026 04 PM PDT           30.70            477         +              Normal
  07/19/2026 05 PM PDT           30.69            474         -              Normal
  07/19/2026 06 PM PDT           30.67            469         -              Normal
  07/19/2026 07 PM PDT           30.67            469         0              Normal
  07/19/2026 08 PM PDT           30.67            469         0              Normal
  07/19/2026 09 PM PDT           30.67            469         0              Normal
  07/19/2026 10 PM PDT           30.65            464         -              Normal
  07/19/2026 11 PM PDT           30.64            461         -              Normal
  07/20/2026 12 AM PDT           30.62            456         -              Normal
  07/20/2026 01 AM PDT           30.61            453         -              Normal
  07/20/2026 02 AM PDT           30.60            451         -              Normal
  07/20/2026 03 AM PDT           30.60            451         0              Normal
  07/20/2026 04 AM PDT           30.59            448         -              Normal
  07/20/2026 05 AM PDT           30.58            445         -              Normal
  07/20/2026 06 AM PDT           30.58            445         0              Normal
  07/20/2026 07 AM PDT           30.57            443         -              Normal
  07/20/2026 08 AM PDT           30.58            445         +              Normal
  07/20/2026 09 AM PDT           30.64            461         +              Normal
  07/20/2026 10 AM PDT           30.64            461         0              Normal
  07/20/2026 11 AM PDT           30.66            466         +              Normal
  07/20/2026 12 PM PDT           30.68            472         +              Normal
  07/20/2026 01 PM PDT           30.68            472         0              Normal
  07/20/2026 02 PM PDT           30.67            469         -              Normal
  07/20/2026 03 PM PDT           30.66            466         -              Normal
  07/20/2026 04 PM PDT           30.64            461         -              Normal
  07/20/2026 05 PM PDT           30.65            464         +              Normal
  07/20/2026 06 PM PDT           30.64            461         -              Normal
  07/20/2026 07 PM PDT           30.64            461         0              Normal
  07/20/2026 08 PM PDT           30.63            458         -              Normal
  07/20/2026 09 PM PDT           30.61            453         -              Normal
  07/20/2026 10 PM PDT           30.62            456         +              Normal
  07/20/2026 11 PM PDT           30.60            451         -              Normal
  07/21/2026 12 AM PDT           30.58            445         -              Normal
  07/21/2026 01 AM PDT           30.57            443         -              Normal
  07/21/2026 02 AM PDT           30.56            440         -              Normal
  07/21/2026 03 AM PDT           30.54            435         -              Normal
  07/21/2026 04 AM PDT           30.51            428         -              Normal
  07/21/2026 05 AM PDT           30.50            425         -              Normal
  07/21/2026 06 AM PDT           30.48            420         -              Normal
  07/21/2026 07 AM PDT           30.45            412         -              Normal
  07/21/2026 08 AM PDT           30.45            412         0              Normal
  07/21/2026 09 AM PDT           30.44            410         -              Normal
  07/21/2026 10 AM PDT           30.47            417         +              Normal
  07/21/2026 11 AM PDT           30.51            428         +              Normal
  07/21/2026 12 PM PDT           30.49            423         -              Normal
  07/21/2026 01 PM PDT           30.53            433         +              Normal
  07/21/2026 02 PM PDT           30.52            430         -              Normal
  07/21/2026 03 PM PDT           30.50            425         -              Normal
  07/21/2026 04 PM PDT           30.49            423         -              Normal
  07/21/2026 05 PM PDT           30.47            417         -              Normal
  07/21/2026 06 PM PDT           30.44            410         -              Normal
  07/21/2026 07 PM PDT           30.44            410         0              Normal
  07/21/2026 08 PM PDT           30.44            410         0              Normal
  07/21/2026 09 PM PDT           30.44            410         0              Normal
  07/21/2026 10 PM PDT           30.46            415         +              Normal
  07/21/2026 11 PM PDT           30.43            407         -              Normal
  07/22/2026 12 AM PDT           30.40            400         -              Normal
  07/22/2026 01 AM PDT           30.41            402         +              Normal
  07/22/2026 02 AM PDT           30.40            400         -              Normal
  07/22/2026 03 AM PDT           30.38            395         -              Normal
  07/22/2026 04 AM PDT           30.38            395         0              Normal
  07/22/2026 05 AM PDT           30.37            393         -              Normal
  07/22/2026 06 AM PDT           30.37            393         0              Normal
  07/22/2026 07 AM PDT           30.36            390         -              Normal
  07/22/2026 08 AM PDT           30.35            388         -              Normal
  07/22/2026 09 AM PDT           30.34            385         -              Normal
  07/22/2026 10 AM PDT           30.32            380         -              Normal
  07/22/2026 11 AM PDT           30.32            380         0              Normal
  07/22/2026 12 PM PDT           30.32            380         0              Normal
  07/22/2026 01 PM PDT           30.29            373         -              Normal
  07/22/2026 02 PM PDT           30.27            368         -              Normal
  07/22/2026 03 PM PDT           30.29            373         +              Normal
  07/22/2026 04 PM PDT           30.28            371         -              Normal
  07/22/2026 05 PM PDT           30.22            356         -              Normal
  07/22/2026 06 PM PDT           30.22            356         0              Normal
  07/22/2026 07 PM PDT           30.20            352         -              Normal
  07/22/2026 08 PM PDT           30.17            345         -              Normal
  07/22/2026 09 PM PDT           30.15            340         -              Normal
  07/22/2026 10 PM PDT           30.15            340         0              Normal
  07/22/2026 11 PM PDT           30.14            338         -              Normal
  07/23/2026 12 AM PDT           30.15            340         +              Normal
  07/23/2026 01 AM PDT           30.17            345         +              Normal
  07/23/2026 02 AM PDT           30.18            347         +              Normal
  07/23/2026 03 AM PDT           30.20            352         +              Normal
  07/23/2026 04 AM PDT           30.21            354         +              Normal
  07/23/2026 05 AM PDT           30.22            356         +              Normal
  07/23/2026 06 AM PDT           30.22            356         0              Normal
  07/23/2026 07 AM PDT           30.22            356         0              Normal
  07/23/2026 08 AM PDT           30.22            356         0              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  07/23/2026 09 AM PDT           30.21            354                        Normal
  07/23/2026 10 AM PDT           30.21            354         0              Normal
  07/23/2026 11 AM PDT           30.21            354         0              Normal
  07/23/2026 12 PM PDT           30.20            352         -              Normal
  07/23/2026 01 PM PDT           30.20            352         0              Normal
  07/23/2026 02 PM PDT           30.20            352         0              Normal
  07/23/2026 03 PM PDT           30.21            354         +              Normal
  07/23/2026 04 PM PDT           30.21            354         0              Normal
  07/23/2026 05 PM PDT           30.22            356         +              Normal
  07/23/2026 06 PM PDT           30.23            359         +              Normal
  07/23/2026 07 PM PDT           30.24            361         +              Normal
  07/23/2026 08 PM PDT           30.25            364         +              Normal
  07/23/2026 09 PM PDT           30.27            368         +              Normal
  07/23/2026 10 PM PDT           30.29            373         +              Normal
  07/23/2026 11 PM PDT           30.32            380         +              Normal
  07/24/2026 12 AM PDT           30.34            385         +              Normal
  07/24/2026 01 AM PDT           30.37            393         +              Normal
  07/24/2026 02 AM PDT           30.41            402         +              Normal
  07/24/2026 03 AM PDT           30.45            412         +              Normal
  07/24/2026 04 AM PDT           30.49            423         +              Normal
  07/24/2026 05 AM PDT           30.53            433         +              Normal
  07/24/2026 06 AM PDT           30.57            443         +              Normal
  07/24/2026 07 AM PDT           30.62            456         +              Normal
  07/24/2026 08 AM PDT           30.66            466         +              Normal
  07/24/2026 09 AM PDT           30.71            479         +              Normal
  07/24/2026 10 AM PDT           30.75            490         +              Normal
  07/24/2026 11 AM PDT           30.79            501         +              Normal
  07/24/2026 12 PM PDT           30.84            514         +              Normal
  07/24/2026 01 PM PDT           30.88            525         +              Normal
  07/24/2026 02 PM PDT           30.92            536         +              Normal
  07/24/2026 03 PM PDT           30.96            547         +              Normal
  07/24/2026 04 PM PDT           31.00            559         +              Normal
  07/24/2026 05 PM PDT           31.04            570         +              Normal
  07/24/2026 06 PM PDT           31.08            581         +              Normal
  07/24/2026 07 PM PDT           31.12            593         +              Normal
  07/24/2026 08 PM PDT           31.15            601         +              Normal
  07/24/2026 09 PM PDT           31.19            613         +              Normal
  07/24/2026 10 PM PDT           31.21            619         +              Normal
  07/24/2026 11 PM PDT           31.24            627         +              Normal
  07/25/2026 12 AM PDT           31.27            636         +              Normal
  07/25/2026 01 AM PDT           31.30            645         +              Normal
  07/25/2026 02 AM PDT           31.32            651         +              Normal
  07/25/2026 03 AM PDT           31.35            660         +              Normal
  07/25/2026 04 AM PDT           31.38            669         +              Normal
  07/25/2026 05 AM PDT           31.40            675         +              Normal
  07/25/2026 06 AM PDT           31.42            682         +              Normal
  07/25/2026 07 AM PDT           31.45            691         +              Normal
  07/25/2026 08 AM PDT           31.46            695         +              Normal
  07/25/2026 09 AM PDT           31.49            705         +              Normal
  07/25/2026 10 AM PDT           31.51            711         +              Normal
  07/25/2026 11 AM PDT           31.52            715         +              Normal
  07/25/2026 12 PM PDT           31.54            721         +              Normal
  07/25/2026 01 PM PDT           31.56            728         +              Normal
  07/25/2026 02 PM PDT           31.57            731         +              Normal
  07/25/2026 03 PM PDT           31.59            738         +              Normal
  07/25/2026 04 PM PDT           31.60            742         +              Normal
  07/25/2026 05 PM PDT           31.62            748         +              Normal
  07/25/2026 06 PM PDT           31.63            752         +              Normal
  07/25/2026 07 PM PDT           31.64            755         +              Normal
  07/25/2026 08 PM PDT           31.65            759         +              Normal
  07/25/2026 09 PM PDT           31.66            762         +              Normal
  07/25/2026 10 PM PDT           31.67            765         +              Normal
  07/25/2026 11 PM PDT           31.68            769         +              Normal
  07/26/2026 12 AM PDT           31.69            772         +              Normal
  07/26/2026 01 AM PDT           31.69            772         0              Normal
  07/26/2026 02 AM PDT           31.70            776         +              Normal
  07/26/2026 03 AM PDT           31.71            779         +              Normal
  07/26/2026 04 AM PDT           31.71            779         0              Normal
  07/26/2026 05 AM PDT           31.72            783         +              Normal
  07/26/2026 06 AM PDT           31.73            786         +              Normal
  07/26/2026 07 AM PDT           31.73            786         0              Normal
  07/26/2026 08 AM PDT           31.73            786         0              Normal
  07/26/2026 09 AM PDT           31.74            790         +              Normal
  07/26/2026 10 AM PDT           31.74            790         0              Normal
  07/26/2026 11 AM PDT           31.75            793         +              Normal
  07/26/2026 12 PM PDT           31.75            793         0              Normal
  07/26/2026 01 PM PDT           31.75            793         0              Normal
  07/26/2026 02 PM PDT           31.76            797         +              Normal
  07/26/2026 03 PM PDT           31.76            797         0              Normal
  07/26/2026 04 PM PDT           31.76            797         0              Normal
  07/26/2026 05 PM PDT           31.76            797         0              Normal
  07/26/2026 06 PM PDT           31.77            800         +              Normal
  07/26/2026 07 PM PDT           31.77            800         0              Normal
  07/26/2026 08 PM PDT           31.77            800         0              Normal
  07/26/2026 09 PM PDT           31.77            800         0              Normal
  07/26/2026 10 PM PDT           31.77            800         0              Normal
  07/26/2026 11 PM PDT           31.77            800         0              Normal
  07/27/2026 12 AM PDT           31.78            804         +              Normal
  07/27/2026 01 AM PDT           31.78            804         0              Normal
  07/27/2026 02 AM PDT           31.78            804         0              Normal
  07/27/2026 03 AM PDT           31.78            804         0              Normal
  07/27/2026 04 AM PDT           31.78            804         0              Normal
  07/27/2026 05 AM PDT           31.78            804         0              Normal
  07/27/2026 06 AM PDT           31.78            804         0              Normal
  07/27/2026 07 AM PDT           31.78            804         0              Normal
  07/27/2026 08 AM PDT           31.79            807         +              Normal
  07/27/2026 09 AM PDT           31.79            807         0              Normal
  07/27/2026 10 AM PDT           31.79            807         0              Normal
  07/27/2026 11 AM PDT           31.79            807         0              Normal
  07/27/2026 12 PM PDT           31.79            807         0              Normal
  07/27/2026 01 PM PDT           31.79            807         0              Normal
  07/27/2026 02 PM PDT           31.79            807         0              Normal
  07/27/2026 03 PM PDT           31.79            807         0              Normal
  07/27/2026 04 PM PDT           31.79            807         0              Normal
  07/27/2026 05 PM PDT           31.79            807         0              Normal
  07/27/2026 06 PM PDT           31.79            807         0              Normal
  07/27/2026 07 PM PDT           31.79            807         0              Normal
  07/27/2026 08 PM PDT           31.79            807         0              Normal
  07/27/2026 09 PM PDT           31.79            807         0              Normal
  07/27/2026 10 PM PDT           31.79            807         0              Normal
  07/27/2026 11 PM PDT           31.79            807         0              Normal
  07/28/2026 12 AM PDT           31.79            807         0              Normal
  07/28/2026 01 AM PDT           31.79            807         0              Normal
  07/28/2026 02 AM PDT           31.79            807         0              Normal
  07/28/2026 03 AM PDT           31.79            807         0              Normal
  07/28/2026 04 AM PDT           31.79            807         0              Normal
  07/28/2026 05 AM PDT           31.79            807         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.