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 17 2026 at 7:17 AM PDTNext Issuance: Aug 18 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:  08/17/2026 at 07:17 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  08/16/2026 at 05:00 PM PDT
# Maximum Observed Stage:                       31.09 Feet
# Maximum Observed Flow:                        584 cfs
#
# Earliest Date & Time of Maximum Forecast:     08/17/2026 at 01:00 PM PDT
# Maximum Forecast Stage:                       31.08 Feet
# Maximum Forecast Flow:                        581 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  08/12/2026 07 AM PDT           30.74            487                        Normal
  08/12/2026 08 AM PDT           30.75            490         +              Normal
  08/12/2026 09 AM PDT           30.76            493         +              Normal
  08/12/2026 10 AM PDT           30.76            493         0              Normal
  08/12/2026 11 AM PDT           30.77            495         +              Normal
  08/12/2026 12 PM PDT           30.77            495         0              Normal
  08/12/2026 01 PM PDT           30.78            498         +              Normal
  08/12/2026 02 PM PDT           30.77            495         -              Normal
  08/12/2026 03 PM PDT           30.76            493         -              Normal
  08/12/2026 04 PM PDT           30.76            493         0              Normal
  08/12/2026 05 PM PDT           30.75            490         -              Normal
  08/12/2026 06 PM PDT           30.75            490         0              Normal
  08/12/2026 07 PM PDT           30.76            493         +              Normal
  08/12/2026 08 PM PDT           30.77            495         +              Normal
  08/12/2026 09 PM PDT           30.74            487         -              Normal
  08/12/2026 10 PM PDT           30.75            490         +              Normal
  08/12/2026 11 PM PDT           30.75            490         0              Normal
  08/13/2026 12 AM PDT           30.75            490         0              Normal
  08/13/2026 01 AM PDT           30.74            487         -              Normal
  08/13/2026 02 AM PDT           30.74            487         0              Normal
  08/13/2026 03 AM PDT           30.74            487         0              Normal
  08/13/2026 04 AM PDT           30.74            487         0              Normal
  08/13/2026 05 AM PDT           30.74            487         0              Normal
  08/13/2026 06 AM PDT           30.74            487         0              Normal
  08/13/2026 07 AM PDT           30.76            493         +              Normal
  08/13/2026 08 AM PDT           30.78            498         +              Normal
  08/13/2026 09 AM PDT           30.79            501         +              Normal
  08/13/2026 10 AM PDT           30.80            503         +              Normal
  08/13/2026 11 AM PDT           30.79            501         -              Normal
  08/13/2026 12 PM PDT           30.81            506         +              Normal
  08/13/2026 01 PM PDT           30.81            506         0              Normal
  08/13/2026 02 PM PDT           30.79            501         -              Normal
  08/13/2026 03 PM PDT           30.80            503         +              Normal
  08/13/2026 04 PM PDT           30.80            503         0              Normal
  08/13/2026 05 PM PDT           30.78            498         -              Normal
  08/13/2026 06 PM PDT           30.79            501         +              Normal
  08/13/2026 07 PM PDT           30.78            498         -              Normal
  08/13/2026 08 PM PDT           30.77            495         -              Normal
  08/13/2026 09 PM PDT           30.76            493         -              Normal
  08/13/2026 10 PM PDT           30.76            493         0              Normal
  08/13/2026 11 PM PDT           30.75            490         -              Normal
  08/14/2026 12 AM PDT           30.74            487         -              Normal
  08/14/2026 01 AM PDT           30.74            487         0              Normal
  08/14/2026 02 AM PDT           30.74            487         0              Normal
  08/14/2026 03 AM PDT           30.74            487         0              Normal
  08/14/2026 04 AM PDT           30.74            487         0              Normal
  08/14/2026 05 AM PDT           30.74            487         0              Normal
  08/14/2026 06 AM PDT           30.74            487         0              Normal
  08/14/2026 07 AM PDT           30.75            490         +              Normal
  08/14/2026 08 AM PDT           30.78            498         +              Normal
  08/14/2026 09 AM PDT           30.80            503         +              Normal
  08/14/2026 10 AM PDT           30.82            509         +              Normal
  08/14/2026 11 AM PDT           30.84            514         +              Normal
  08/14/2026 12 PM PDT           30.85            517         +              Normal
  08/14/2026 01 PM PDT           30.86            520         +              Normal
  08/14/2026 02 PM PDT           30.87            523         +              Normal
  08/14/2026 03 PM PDT           30.87            523         0              Normal
  08/14/2026 04 PM PDT           30.88            525         +              Normal
  08/14/2026 05 PM PDT           30.87            523         -              Normal
  08/14/2026 06 PM PDT           30.84            514         -              Normal
  08/14/2026 07 PM PDT           30.82            509         -              Normal
  08/14/2026 08 PM PDT           30.81            506         -              Normal
  08/14/2026 09 PM PDT           30.79            501         -              Normal
  08/14/2026 10 PM PDT           30.77            495         -              Normal
  08/14/2026 11 PM PDT           30.77            495         0              Normal
  08/15/2026 12 AM PDT           30.76            493         -              Normal
  08/15/2026 01 AM PDT           30.74            487         -              Normal
  08/15/2026 02 AM PDT           30.73            485         -              Normal
  08/15/2026 03 AM PDT           30.72            482         -              Normal
  08/15/2026 04 AM PDT           30.70            477         -              Normal
  08/15/2026 05 AM PDT           30.69            474         -              Normal
  08/15/2026 06 AM PDT           30.69            474         0              Normal
  08/15/2026 07 AM PDT           30.70            477         +              Normal
  08/15/2026 08 AM PDT           30.71            479         +              Normal
  08/15/2026 09 AM PDT           30.72            482         +              Normal
  08/15/2026 10 AM PDT           30.72            482         0              Normal
  08/15/2026 11 AM PDT           30.77            495         +              Normal
  08/15/2026 12 PM PDT           30.79            501         +              Normal
  08/15/2026 01 PM PDT           30.78            498         -              Normal
  08/15/2026 02 PM PDT           30.81            506         +              Normal
  08/15/2026 03 PM PDT           30.88            525         +              Normal
  08/15/2026 04 PM PDT           30.85            517         -              Normal
  08/15/2026 05 PM PDT           30.84            514         -              Normal
  08/15/2026 06 PM PDT           30.88            525         +              Normal
  08/15/2026 07 PM PDT           30.88            525         0              Normal
  08/15/2026 08 PM PDT           30.89            528         +              Normal
  08/15/2026 09 PM PDT           30.90            531         +              Normal
  08/15/2026 10 PM PDT           30.90            531         0              Normal
  08/15/2026 11 PM PDT           30.87            523         -              Normal
  08/16/2026 12 AM PDT           30.88            525         +              Normal
  08/16/2026 01 AM PDT           30.89            528         +              Normal
  08/16/2026 02 AM PDT           30.89            528         0              Normal
  08/16/2026 03 AM PDT           30.87            523         -              Normal
  08/16/2026 04 AM PDT           30.88            525         +              Normal
  08/16/2026 05 AM PDT           30.89            528         +              Normal
  08/16/2026 06 AM PDT           30.92            536         +              Normal
  08/16/2026 07 AM PDT           30.92            536         0              Normal
  08/16/2026 08 AM PDT           30.94            542         +              Normal
  08/16/2026 09 AM PDT           30.97            550         +              Normal
  08/16/2026 10 AM PDT           30.98            553         +              Normal
  08/16/2026 11 AM PDT           31.01            561         +              Normal
  08/16/2026 12 PM PDT           31.04            570         +              Normal
  08/16/2026 01 PM PDT           31.05            573         +              Normal
  08/16/2026 02 PM PDT           31.08            581         +              Normal
  08/16/2026 03 PM PDT           31.08            581         0              Normal
  08/16/2026 04 PM PDT           31.09            584         +              Normal
  08/16/2026 05 PM PDT           31.09            584         0              Normal
  08/16/2026 06 PM PDT           31.08            581         -              Normal
  08/16/2026 07 PM PDT           31.08            581         0              Normal
  08/16/2026 08 PM PDT           31.08            581         0              Normal
  08/16/2026 09 PM PDT           31.07            578         -              Normal
  08/16/2026 10 PM PDT           31.06            575         -              Normal
  08/16/2026 11 PM PDT           31.06            575         0              Normal
  08/17/2026 12 AM PDT           31.05            573         -              Normal
  08/17/2026 01 AM PDT           31.05            573         0              Normal
  08/17/2026 02 AM PDT           31.04            570         -              Normal
  08/17/2026 03 AM PDT           31.04            570         0              Normal
  08/17/2026 04 AM PDT           31.05            573         +              Normal
  08/17/2026 05 AM PDT           31.06            575         +              Normal
  08/17/2026 06 AM PDT           31.06            575         0              Normal
  08/17/2026 07 AM PDT           31.06            575         0              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  08/17/2026 08 AM PDT           31.06            575                        Normal
  08/17/2026 09 AM PDT           31.07            578         +              Normal
  08/17/2026 10 AM PDT           31.07            578         0              Normal
  08/17/2026 11 AM PDT           31.07            578         0              Normal
  08/17/2026 12 PM PDT           31.07            578         0              Normal
  08/17/2026 01 PM PDT           31.08            581         +              Normal
  08/17/2026 02 PM PDT           31.08            581         0              Normal
  08/17/2026 03 PM PDT           31.08            581         0              Normal
  08/17/2026 04 PM PDT           31.08            581         0              Normal
  08/17/2026 05 PM PDT           31.08            581         0              Normal
  08/17/2026 06 PM PDT           31.08            581         0              Normal
  08/17/2026 07 PM PDT           31.08            581         0              Normal
  08/17/2026 08 PM PDT           31.08            581         0              Normal
  08/17/2026 09 PM PDT           31.08            581         0              Normal
  08/17/2026 10 PM PDT           31.08            581         0              Normal
  08/17/2026 11 PM PDT           31.08            581         0              Normal
  08/18/2026 12 AM PDT           31.08            581         0              Normal
  08/18/2026 01 AM PDT           31.08            581         0              Normal
  08/18/2026 02 AM PDT           31.08            581         0              Normal
  08/18/2026 03 AM PDT           31.08            581         0              Normal
  08/18/2026 04 AM PDT           31.07            578         -              Normal
  08/18/2026 05 AM PDT           31.07            578         0              Normal
  08/18/2026 06 AM PDT           31.07            578         0              Normal
  08/18/2026 07 AM PDT           31.07            578         0              Normal
  08/18/2026 08 AM PDT           31.07            578         0              Normal
  08/18/2026 09 AM PDT           31.07            578         0              Normal
  08/18/2026 10 AM PDT           31.07            578         0              Normal
  08/18/2026 11 AM PDT           31.07            578         0              Normal
  08/18/2026 12 PM PDT           31.07            578         0              Normal
  08/18/2026 01 PM PDT           31.07            578         0              Normal
  08/18/2026 02 PM PDT           31.07            578         0              Normal
  08/18/2026 03 PM PDT           31.07            578         0              Normal
  08/18/2026 04 PM PDT           31.07            578         0              Normal
  08/18/2026 05 PM PDT           31.06            575         -              Normal
  08/18/2026 06 PM PDT           31.06            575         0              Normal
  08/18/2026 07 PM PDT           31.06            575         0              Normal
  08/18/2026 08 PM PDT           31.06            575         0              Normal
  08/18/2026 09 PM PDT           31.06            575         0              Normal
  08/18/2026 10 PM PDT           31.06            575         0              Normal
  08/18/2026 11 PM PDT           31.06            575         0              Normal
  08/19/2026 12 AM PDT           31.06            575         0              Normal
  08/19/2026 01 AM PDT           31.06            575         0              Normal
  08/19/2026 02 AM PDT           31.06            575         0              Normal
  08/19/2026 03 AM PDT           31.06            575         0              Normal
  08/19/2026 04 AM PDT           31.06            575         0              Normal
  08/19/2026 05 AM PDT           31.06            575         0              Normal
  08/19/2026 06 AM PDT           31.05            573         -              Normal
  08/19/2026 07 AM PDT           31.05            573         0              Normal
  08/19/2026 08 AM PDT           31.05            573         0              Normal
  08/19/2026 09 AM PDT           31.05            573         0              Normal
  08/19/2026 10 AM PDT           31.05            573         0              Normal
  08/19/2026 11 AM PDT           31.05            573         0              Normal
  08/19/2026 12 PM PDT           31.05            573         0              Normal
  08/19/2026 01 PM PDT           31.05            573         0              Normal
  08/19/2026 02 PM PDT           31.05            573         0              Normal
  08/19/2026 03 PM PDT           31.05            573         0              Normal
  08/19/2026 04 PM PDT           31.05            573         0              Normal
  08/19/2026 05 PM PDT           31.05            573         0              Normal
  08/19/2026 06 PM PDT           31.05            573         0              Normal
  08/19/2026 07 PM PDT           31.05            573         0              Normal
  08/19/2026 08 PM PDT           31.05            573         0              Normal
  08/19/2026 09 PM PDT           31.05            573         0              Normal
  08/19/2026 10 PM PDT           31.05            573         0              Normal
  08/19/2026 11 PM PDT           31.05            573         0              Normal
  08/20/2026 12 AM PDT           31.05            573         0              Normal
  08/20/2026 01 AM PDT           31.05            573         0              Normal
  08/20/2026 02 AM PDT           31.04            570         -              Normal
  08/20/2026 03 AM PDT           31.04            570         0              Normal
  08/20/2026 04 AM PDT           31.04            570         0              Normal
  08/20/2026 05 AM PDT           31.04            570         0              Normal
  08/20/2026 06 AM PDT           31.04            570         0              Normal
  08/20/2026 07 AM PDT           31.04            570         0              Normal
  08/20/2026 08 AM PDT           31.04            570         0              Normal
  08/20/2026 09 AM PDT           31.04            570         0              Normal
  08/20/2026 10 AM PDT           31.04            570         0              Normal
  08/20/2026 11 AM PDT           31.04            570         0              Normal
  08/20/2026 12 PM PDT           31.04            570         0              Normal
  08/20/2026 01 PM PDT           31.04            570         0              Normal
  08/20/2026 02 PM PDT           31.04            570         0              Normal
  08/20/2026 03 PM PDT           31.04            570         0              Normal
  08/20/2026 04 PM PDT           31.04            570         0              Normal
  08/20/2026 05 PM PDT           31.04            570         0              Normal
  08/20/2026 06 PM PDT           31.04            570         0              Normal
  08/20/2026 07 PM PDT           31.04            570         0              Normal
  08/20/2026 08 PM PDT           31.04            570         0              Normal
  08/20/2026 09 PM PDT           31.04            570         0              Normal
  08/20/2026 10 PM PDT           31.04            570         0              Normal
  08/20/2026 11 PM PDT           31.04            570         0              Normal
  08/21/2026 12 AM PDT           31.04            570         0              Normal
  08/21/2026 01 AM PDT           31.04            570         0              Normal
  08/21/2026 02 AM PDT           31.04            570         0              Normal
  08/21/2026 03 AM PDT           31.04            570         0              Normal
  08/21/2026 04 AM PDT           31.03            567         -              Normal
  08/21/2026 05 AM PDT           31.03            567         0              Normal
  08/21/2026 06 AM PDT           31.03            567         0              Normal
  08/21/2026 07 AM PDT           31.03            567         0              Normal
  08/21/2026 08 AM PDT           31.03            567         0              Normal
  08/21/2026 09 AM PDT           31.03            567         0              Normal
  08/21/2026 10 AM PDT           31.03            567         0              Normal
  08/21/2026 11 AM PDT           31.03            567         0              Normal
  08/21/2026 12 PM PDT           31.03            567         0              Normal
  08/21/2026 01 PM PDT           31.03            567         0              Normal
  08/21/2026 02 PM PDT           31.03            567         0              Normal
  08/21/2026 03 PM PDT           31.03            567         0              Normal
  08/21/2026 04 PM PDT           31.03            567         0              Normal
  08/21/2026 05 PM PDT           31.03            567         0              Normal
  08/21/2026 06 PM PDT           31.03            567         0              Normal
  08/21/2026 07 PM PDT           31.03            567         0              Normal
  08/21/2026 08 PM PDT           31.03            567         0              Normal
  08/21/2026 09 PM PDT           31.03            567         0              Normal
  08/21/2026 10 PM PDT           31.03            567         0              Normal
  08/21/2026 11 PM PDT           31.03            567         0              Normal
  08/22/2026 12 AM PDT           31.03            567         0              Normal
  08/22/2026 01 AM PDT           31.03            567         0              Normal
  08/22/2026 02 AM PDT           31.03            567         0              Normal
  08/22/2026 03 AM PDT           31.03            567         0              Normal
  08/22/2026 04 AM PDT           31.03            567         0              Normal
  08/22/2026 05 AM PDT           31.03            567         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.