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: Aug 04 2026 at 7:16 AM PDTNext Issuance: Aug 05 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:  08/04/2026 at 07:16 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  08/03/2026 at 01:00 PM PDT
# Maximum Observed Stage:                       32.11 Feet
# Maximum Observed Flow:                        923 cfs
#
# Earliest Date & Time of Maximum Forecast:     08/04/2026 at 08:00 AM PDT
# Maximum Forecast Stage:                       31.87 Feet
# Maximum Forecast Flow:                        836 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  07/30/2026 07 AM PDT           31.42            682                        Normal
  07/30/2026 08 AM PDT           31.45            691         +              Normal
  07/30/2026 09 AM PDT           31.44            688         -              Normal
  07/30/2026 10 AM PDT           31.42            682         -              Normal
  07/30/2026 11 AM PDT           31.42            682         0              Normal
  07/30/2026 12 PM PDT           31.42            682         0              Normal
  07/30/2026 01 PM PDT           31.45            691         +              Normal
  07/30/2026 02 PM PDT           31.47            698         +              Normal
  07/30/2026 03 PM PDT           31.48            701         +              Normal
  07/30/2026 04 PM PDT           31.49            705         +              Normal
  07/30/2026 05 PM PDT           31.50            708         +              Normal
  07/30/2026 06 PM PDT           31.52            715         +              Normal
  07/30/2026 07 PM PDT           31.51            711         -              Normal
  07/30/2026 08 PM PDT           31.52            715         +              Normal
  07/30/2026 09 PM PDT           31.53            718         +              Normal
  07/30/2026 10 PM PDT           31.53            718         0              Normal
  07/30/2026 11 PM PDT           31.55            725         +              Normal
  07/31/2026 12 AM PDT           31.55            725         0              Normal
  07/31/2026 01 AM PDT           31.56            728         +              Normal
  07/31/2026 02 AM PDT           31.57            731         +              Normal
  07/31/2026 03 AM PDT           31.58            735         +              Normal
  07/31/2026 04 AM PDT           31.58            735         0              Normal
  07/31/2026 05 AM PDT           31.59            738         +              Normal
  07/31/2026 06 AM PDT           31.60            742         +              Normal
  07/31/2026 07 AM PDT           31.59            738         -              Normal
  07/31/2026 08 AM PDT           31.60            742         +              Normal
  07/31/2026 09 AM PDT           31.62            748         +              Normal
  07/31/2026 10 AM PDT           31.66            762         +              Normal
  07/31/2026 11 AM PDT           31.67            765         +              Normal
  07/31/2026 12 PM PDT           31.69            772         +              Normal
  07/31/2026 01 PM PDT           31.73            786         +              Normal
  07/31/2026 02 PM PDT           31.73            786         0              Normal
  07/31/2026 03 PM PDT           31.73            786         0              Normal
  07/31/2026 04 PM PDT           31.76            797         +              Normal
  07/31/2026 05 PM PDT           31.76            797         0              Normal
  07/31/2026 06 PM PDT           31.78            804         +              Normal
  07/31/2026 07 PM PDT           31.78            804         0              Normal
  07/31/2026 08 PM PDT           31.78            804         0              Normal
  07/31/2026 09 PM PDT           31.77            800         -              Normal
  07/31/2026 10 PM PDT           31.74            790         -              Normal
  07/31/2026 11 PM PDT           31.78            804         +              Normal
  08/01/2026 12 AM PDT           31.74            790         -              Normal
  08/01/2026 01 AM PDT           31.73            786         -              Normal
  08/01/2026 02 AM PDT           31.75            793         +              Normal
  08/01/2026 03 AM PDT           31.74            790         -              Normal
  08/01/2026 04 AM PDT           31.70            776         -              Normal
  08/01/2026 05 AM PDT           31.70            776         0              Normal
  08/01/2026 06 AM PDT           31.70            776         0              Normal
  08/01/2026 07 AM PDT           31.67            765         -              Normal
  08/01/2026 08 AM PDT           31.66            762         -              Normal
  08/01/2026 09 AM PDT           31.66            762         0              Normal
  08/01/2026 10 AM PDT           31.65            759         -              Normal
  08/01/2026 11 AM PDT           31.67            765         +              Normal
  08/01/2026 12 PM PDT           31.68            769         +              Normal
  08/01/2026 01 PM PDT           31.69            772         +              Normal
  08/01/2026 02 PM PDT           31.71            779         +              Normal
  08/01/2026 03 PM PDT           31.70            776         -              Normal
  08/01/2026 04 PM PDT           31.70            776         0              Normal
  08/01/2026 05 PM PDT           31.70            776         0              Normal
  08/01/2026 06 PM PDT           31.73            786         +              Normal
  08/01/2026 07 PM PDT           31.70            776         -              Normal
  08/01/2026 08 PM PDT           31.72            783         +              Normal
  08/01/2026 09 PM PDT           31.75            793         +              Normal
  08/01/2026 10 PM PDT           31.73            786         -              Normal
  08/01/2026 11 PM PDT           31.74            790         +              Normal
  08/02/2026 12 AM PDT           31.77            800         +              Normal
  08/02/2026 01 AM PDT           31.75            793         -              Normal
  08/02/2026 02 AM PDT           31.78            804         +              Normal
  08/02/2026 03 AM PDT           31.79            807         +              Normal
  08/02/2026 04 AM PDT           31.79            807         0              Normal
  08/02/2026 05 AM PDT           31.81            814         +              Normal
  08/02/2026 06 AM PDT           31.83            821         +              Normal
  08/02/2026 07 AM PDT           31.84            825         +              Normal
  08/02/2026 08 AM PDT           31.86            832         +              Normal
  08/02/2026 09 AM PDT           31.91            850         +              Normal
  08/02/2026 10 AM PDT           31.94            861         +              Normal
  08/02/2026 11 AM PDT           31.96            868         +              Normal
  08/02/2026 12 PM PDT           31.98            875         +              Normal
  08/02/2026 01 PM PDT           32.00            883         +              Normal
  08/02/2026 02 PM PDT           32.01            886         +              Normal
  08/02/2026 03 PM PDT           32.02            890         +              Normal
  08/02/2026 04 PM PDT           32.04            897         +              Normal
  08/02/2026 05 PM PDT           32.05            901         +              Normal
  08/02/2026 06 PM PDT           32.05            901         0              Normal
  08/02/2026 07 PM PDT           32.06            905         +              Normal
  08/02/2026 08 PM PDT           32.06            905         0              Normal
  08/02/2026 09 PM PDT           32.08            912         +              Normal
  08/02/2026 10 PM PDT           32.07            908         -              Normal
  08/02/2026 11 PM PDT           32.06            905         -              Normal
  08/03/2026 12 AM PDT           32.08            912         +              Normal
  08/03/2026 01 AM PDT           32.06            905         -              Normal
  08/03/2026 02 AM PDT           32.05            901         -              Normal
  08/03/2026 03 AM PDT           32.06            905         +              Normal
  08/03/2026 04 AM PDT           32.06            905         0              Normal
  08/03/2026 05 AM PDT           32.04            897         -              Normal
  08/03/2026 06 AM PDT           32.07            908         +              Normal
  08/03/2026 07 AM PDT           32.08            912         +              Normal
  08/03/2026 08 AM PDT           32.04            897         -              Normal
  08/03/2026 09 AM PDT           32.06            905         +              Normal
  08/03/2026 10 AM PDT           32.10            919         +              Normal
  08/03/2026 11 AM PDT           32.08            912         -              Normal
  08/03/2026 12 PM PDT           32.10            919         +              Normal
  08/03/2026 01 PM PDT           32.11            923         +              Normal
  08/03/2026 02 PM PDT           32.08            912         -              Normal
  08/03/2026 03 PM PDT           32.10            919         +              Normal
  08/03/2026 04 PM PDT           32.10            919         0              Normal
  08/03/2026 05 PM PDT           32.09            916         -              Normal
  08/03/2026 06 PM PDT           32.08            912         -              Normal
  08/03/2026 07 PM PDT           32.06            905         -              Normal
  08/03/2026 08 PM PDT           32.03            893         -              Normal
  08/03/2026 09 PM PDT           32.02            890         -              Normal
  08/03/2026 10 PM PDT           31.99            879         -              Normal
  08/03/2026 11 PM PDT           31.98            875         -              Normal
  08/04/2026 12 AM PDT           31.96            868         -              Normal
  08/04/2026 01 AM PDT           31.95            864         -              Normal
  08/04/2026 02 AM PDT           31.93            857         -              Normal
  08/04/2026 03 AM PDT           31.92            853         -              Normal
  08/04/2026 04 AM PDT           31.90            846         -              Normal
  08/04/2026 05 AM PDT           31.88            839         -              Normal
  08/04/2026 06 AM PDT           31.88            839         0              Normal
  08/04/2026 07 AM PDT           31.88            839         0              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  08/04/2026 08 AM PDT           31.87            836                        Normal
  08/04/2026 09 AM PDT           31.86            832         -              Normal
  08/04/2026 10 AM PDT           31.86            832         0              Normal
  08/04/2026 11 AM PDT           31.85            828         -              Normal
  08/04/2026 12 PM PDT           31.84            825         -              Normal
  08/04/2026 01 PM PDT           31.83            821         -              Normal
  08/04/2026 02 PM PDT           31.82            818         -              Normal
  08/04/2026 03 PM PDT           31.81            814         -              Normal
  08/04/2026 04 PM PDT           31.80            811         -              Normal
  08/04/2026 05 PM PDT           31.79            807         -              Normal
  08/04/2026 06 PM PDT           31.78            804         -              Normal
  08/04/2026 07 PM PDT           31.77            800         -              Normal
  08/04/2026 08 PM PDT           31.76            797         -              Normal
  08/04/2026 09 PM PDT           31.75            793         -              Normal
  08/04/2026 10 PM PDT           31.74            790         -              Normal
  08/04/2026 11 PM PDT           31.73            786         -              Normal
  08/05/2026 12 AM PDT           31.72            783         -              Normal
  08/05/2026 01 AM PDT           31.71            779         -              Normal
  08/05/2026 02 AM PDT           31.70            776         -              Normal
  08/05/2026 03 AM PDT           31.68            769         -              Normal
  08/05/2026 04 AM PDT           31.67            765         -              Normal
  08/05/2026 05 AM PDT           31.66            762         -              Normal
  08/05/2026 06 AM PDT           31.65            759         -              Normal
  08/05/2026 07 AM PDT           31.64            755         -              Normal
  08/05/2026 08 AM PDT           31.63            752         -              Normal
  08/05/2026 09 AM PDT           31.61            745         -              Normal
  08/05/2026 10 AM PDT           31.60            742         -              Normal
  08/05/2026 11 AM PDT           31.59            738         -              Normal
  08/05/2026 12 PM PDT           31.58            735         -              Normal
  08/05/2026 01 PM PDT           31.57            731         -              Normal
  08/05/2026 02 PM PDT           31.55            725         -              Normal
  08/05/2026 03 PM PDT           31.54            721         -              Normal
  08/05/2026 04 PM PDT           31.53            718         -              Normal
  08/05/2026 05 PM PDT           31.51            711         -              Normal
  08/05/2026 06 PM PDT           31.50            708         -              Normal
  08/05/2026 07 PM PDT           31.49            705         -              Normal
  08/05/2026 08 PM PDT           31.48            701         -              Normal
  08/05/2026 09 PM PDT           31.46            695         -              Normal
  08/05/2026 10 PM PDT           31.45            691         -              Normal
  08/05/2026 11 PM PDT           31.44            688         -              Normal
  08/06/2026 12 AM PDT           31.43            685         -              Normal
  08/06/2026 01 AM PDT           31.41            678         -              Normal
  08/06/2026 02 AM PDT           31.41            678         0              Normal
  08/06/2026 03 AM PDT           31.39            672         -              Normal
  08/06/2026 04 AM PDT           31.38            669         -              Normal
  08/06/2026 05 AM PDT           31.37            666         -              Normal
  08/06/2026 06 AM PDT           31.36            663         -              Normal
  08/06/2026 07 AM PDT           31.35            660         -              Normal
  08/06/2026 08 AM PDT           31.34            657         -              Normal
  08/06/2026 09 AM PDT           31.33            654         -              Normal
  08/06/2026 10 AM PDT           31.32            651         -              Normal
  08/06/2026 11 AM PDT           31.31            648         -              Normal
  08/06/2026 12 PM PDT           31.30            645         -              Normal
  08/06/2026 01 PM PDT           31.29            642         -              Normal
  08/06/2026 02 PM PDT           31.29            642         0              Normal
  08/06/2026 03 PM PDT           31.28            639         -              Normal
  08/06/2026 04 PM PDT           31.27            636         -              Normal
  08/06/2026 05 PM PDT           31.26            633         -              Normal
  08/06/2026 06 PM PDT           31.26            633         0              Normal
  08/06/2026 07 PM PDT           31.25            630         -              Normal
  08/06/2026 08 PM PDT           31.25            630         0              Normal
  08/06/2026 09 PM PDT           31.24            627         -              Normal
  08/06/2026 10 PM PDT           31.23            624         -              Normal
  08/06/2026 11 PM PDT           31.23            624         0              Normal
  08/07/2026 12 AM PDT           31.22            622         -              Normal
  08/07/2026 01 AM PDT           31.21            619         -              Normal
  08/07/2026 02 AM PDT           31.21            619         0              Normal
  08/07/2026 03 AM PDT           31.21            619         0              Normal
  08/07/2026 04 AM PDT           31.20            616         -              Normal
  08/07/2026 05 AM PDT           31.20            616         0              Normal
  08/07/2026 06 AM PDT           31.20            616         0              Normal
  08/07/2026 07 AM PDT           31.19            613         -              Normal
  08/07/2026 08 AM PDT           31.19            613         0              Normal
  08/07/2026 09 AM PDT           31.19            613         0              Normal
  08/07/2026 10 AM PDT           31.18            610         -              Normal
  08/07/2026 11 AM PDT           31.18            610         0              Normal
  08/07/2026 12 PM PDT           31.18            610         0              Normal
  08/07/2026 01 PM PDT           31.18            610         0              Normal
  08/07/2026 02 PM PDT           31.18            610         0              Normal
  08/07/2026 03 PM PDT           31.17            607         -              Normal
  08/07/2026 04 PM PDT           31.17            607         0              Normal
  08/07/2026 05 PM PDT           31.17            607         0              Normal
  08/07/2026 06 PM PDT           31.17            607         0              Normal
  08/07/2026 07 PM PDT           31.17            607         0              Normal
  08/07/2026 08 PM PDT           31.16            604         -              Normal
  08/07/2026 09 PM PDT           31.16            604         0              Normal
  08/07/2026 10 PM PDT           31.16            604         0              Normal
  08/07/2026 11 PM PDT           31.16            604         0              Normal
  08/08/2026 12 AM PDT           31.16            604         0              Normal
  08/08/2026 01 AM PDT           31.16            604         0              Normal
  08/08/2026 02 AM PDT           31.16            604         0              Normal
  08/08/2026 03 AM PDT           31.16            604         0              Normal
  08/08/2026 04 AM PDT           31.16            604         0              Normal
  08/08/2026 05 AM PDT           31.16            604         0              Normal
  08/08/2026 06 AM PDT           31.16            604         0              Normal
  08/08/2026 07 AM PDT           31.16            604         0              Normal
  08/08/2026 08 AM PDT           31.15            601         -              Normal
  08/08/2026 09 AM PDT           31.15            601         0              Normal
  08/08/2026 10 AM PDT           31.15            601         0              Normal
  08/08/2026 11 AM PDT           31.15            601         0              Normal
  08/08/2026 12 PM PDT           31.15            601         0              Normal
  08/08/2026 01 PM PDT           31.15            601         0              Normal
  08/08/2026 02 PM PDT           31.15            601         0              Normal
  08/08/2026 03 PM PDT           31.15            601         0              Normal
  08/08/2026 04 PM PDT           31.15            601         0              Normal
  08/08/2026 05 PM PDT           31.15            601         0              Normal
  08/08/2026 06 PM PDT           31.15            601         0              Normal
  08/08/2026 07 PM PDT           31.15            601         0              Normal
  08/08/2026 08 PM PDT           31.15            601         0              Normal
  08/08/2026 09 PM PDT           31.15            601         0              Normal
  08/08/2026 10 PM PDT           31.15            601         0              Normal
  08/08/2026 11 PM PDT           31.15            601         0              Normal
  08/09/2026 12 AM PDT           31.15            601         0              Normal
  08/09/2026 01 AM PDT           31.15            601         0              Normal
  08/09/2026 02 AM PDT           31.15            601         0              Normal
  08/09/2026 03 AM PDT           31.15            601         0              Normal
  08/09/2026 04 AM PDT           31.15            601         0              Normal
  08/09/2026 05 AM PDT           31.15            601         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.