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 11 2026 at 8:22 AM PDTNext Issuance: May 12 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:  05/11/2026 at 08:23 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  05/06/2026 at 08:00 AM PDT
# Maximum Observed Stage:                       32.18 Feet
# Maximum Observed Flow:                        675 cfs
#
# Earliest Date & Time of Maximum Forecast:     05/11/2026 at 09:00 AM PDT
# Maximum Forecast Stage:                       32.11 Feet
# Maximum Forecast Flow:                        654 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  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           31.96            610         -              Normal
  05/09/2026 08 AM PDT           31.97            613         +              Normal
  05/09/2026 09 AM PDT           31.96            610         -              Normal
  05/09/2026 10 AM PDT           31.96            610         0              Normal
  05/09/2026 11 AM PDT           31.95            607         -              Normal
  05/09/2026 12 PM PDT           31.95            607         0              Normal
  05/09/2026 01 PM PDT           31.95            607         0              Normal
  05/09/2026 02 PM PDT           31.96            610         +              Normal
  05/09/2026 03 PM PDT           31.95            607         -              Normal
  05/09/2026 04 PM PDT           31.95            607         0              Normal
  05/09/2026 05 PM PDT           31.97            613         +              Normal
  05/09/2026 06 PM PDT           31.97            613         0              Normal
  05/09/2026 07 PM PDT           31.98            616         +              Normal
  05/09/2026 08 PM PDT           31.97            613         -              Normal
  05/09/2026 09 PM PDT           31.96            610         -              Normal
  05/09/2026 10 PM PDT           31.97            613         +              Normal
  05/09/2026 11 PM PDT           31.96            610         -              Normal
  05/10/2026 12 AM PDT           31.96            610         0              Normal
  05/10/2026 01 AM PDT           31.96            610         0              Normal
  05/10/2026 02 AM PDT           31.95            607         -              Normal
  05/10/2026 03 AM PDT           31.95            607         0              Normal
  05/10/2026 04 AM PDT           31.95            607         0              Normal
  05/10/2026 05 AM PDT           31.95            607         0              Normal
  05/10/2026 06 AM PDT           31.97            613         +              Normal
  05/10/2026 07 AM PDT           31.98            616         +              Normal
  05/10/2026 08 AM PDT           31.99            619         +              Normal
  05/10/2026 09 AM PDT           32.01            624         +              Normal
  05/10/2026 10 AM PDT           32.03            630         +              Normal
  05/10/2026 11 AM PDT           32.05            636         +              Normal
  05/10/2026 12 PM PDT           32.07            642         +              Normal
  05/10/2026 01 PM PDT           32.07            642         0              Normal
  05/10/2026 02 PM PDT           32.08            645         +              Normal
  05/10/2026 03 PM PDT           32.08            645         0              Normal
  05/10/2026 04 PM PDT           32.09            648         +              Normal
  05/10/2026 05 PM PDT           32.09            648         0              Normal
  05/10/2026 06 PM PDT           32.09            648         0              Normal
  05/10/2026 07 PM PDT           32.09            648         0              Normal
  05/10/2026 08 PM PDT           32.09            648         0              Normal
  05/10/2026 09 PM PDT           32.09            648         0              Normal
  05/10/2026 10 PM PDT           32.09            648         0              Normal
  05/10/2026 11 PM PDT           32.08            645         -              Normal
  05/11/2026 12 AM PDT           32.09            648         +              Normal
  05/11/2026 01 AM PDT           32.09            648         0              Normal
  05/11/2026 02 AM PDT           32.10            651         +              Normal
  05/11/2026 03 AM PDT           32.11            654         +              Normal
  05/11/2026 04 AM PDT           32.11            654         0              Normal
  05/11/2026 05 AM PDT           32.11            654         0              Normal
  05/11/2026 06 AM PDT           32.11            654         0              Normal
  05/11/2026 07 AM PDT           32.11            654         0              Normal
  05/11/2026 08 AM PDT           32.11            654         0              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  05/11/2026 09 AM PDT           32.11            654                        Normal
  05/11/2026 10 AM PDT           32.11            654         0              Normal
  05/11/2026 11 AM PDT           32.11            654         0              Normal
  05/11/2026 12 PM PDT           32.11            654         0              Normal
  05/11/2026 01 PM PDT           32.11            654         0              Normal
  05/11/2026 02 PM PDT           32.11            654         0              Normal
  05/11/2026 03 PM PDT           32.11            654         0              Normal
  05/11/2026 04 PM PDT           32.11            654         0              Normal
  05/11/2026 05 PM PDT           32.11            654         0              Normal
  05/11/2026 06 PM PDT           32.11            654         0              Normal
  05/11/2026 07 PM PDT           32.11            654         0              Normal
  05/11/2026 08 PM PDT           32.11            654         0              Normal
  05/11/2026 09 PM PDT           32.11            654         0              Normal
  05/11/2026 10 PM PDT           32.11            654         0              Normal
  05/11/2026 11 PM PDT           32.11            654         0              Normal
  05/12/2026 12 AM PDT           32.11            654         0              Normal
  05/12/2026 01 AM PDT           32.11            654         0              Normal
  05/12/2026 02 AM PDT           32.11            654         0              Normal
  05/12/2026 03 AM PDT           32.11            654         0              Normal
  05/12/2026 04 AM PDT           32.10            651         -              Normal
  05/12/2026 05 AM PDT           32.10            651         0              Normal
  05/12/2026 06 AM PDT           32.10            651         0              Normal
  05/12/2026 07 AM PDT           32.09            648         -              Normal
  05/12/2026 08 AM PDT           32.09            648         0              Normal
  05/12/2026 09 AM PDT           32.09            648         0              Normal
  05/12/2026 10 AM PDT           32.08            645         -              Normal
  05/12/2026 11 AM PDT           32.08            645         0              Normal
  05/12/2026 12 PM PDT           32.07            642         -              Normal
  05/12/2026 01 PM PDT           32.07            642         0              Normal
  05/12/2026 02 PM PDT           32.06            639         -              Normal
  05/12/2026 03 PM PDT           32.06            639         0              Normal
  05/12/2026 04 PM PDT           32.05            636         -              Normal
  05/12/2026 05 PM PDT           32.05            636         0              Normal
  05/12/2026 06 PM PDT           32.04            633         -              Normal
  05/12/2026 07 PM PDT           32.03            630         -              Normal
  05/12/2026 08 PM PDT           32.03            630         0              Normal
  05/12/2026 09 PM PDT           32.02            627         -              Normal
  05/12/2026 10 PM PDT           32.01            624         -              Normal
  05/12/2026 11 PM PDT           32.01            624         0              Normal
  05/13/2026 12 AM PDT           32.00            622         -              Normal
  05/13/2026 01 AM PDT           31.99            619         -              Normal
  05/13/2026 02 AM PDT           31.98            616         -              Normal
  05/13/2026 03 AM PDT           31.98            616         0              Normal
  05/13/2026 04 AM PDT           31.97            613         -              Normal
  05/13/2026 05 AM PDT           31.96            610         -              Normal
  05/13/2026 06 AM PDT           31.95            607         -              Normal
  05/13/2026 07 AM PDT           31.95            607         0              Normal
  05/13/2026 08 AM PDT           31.94            604         -              Normal
  05/13/2026 09 AM PDT           31.93            601         -              Normal
  05/13/2026 10 AM PDT           31.92            598         -              Normal
  05/13/2026 11 AM PDT           31.91            595         -              Normal
  05/13/2026 12 PM PDT           31.91            595         0              Normal
  05/13/2026 01 PM PDT           31.90            593         -              Normal
  05/13/2026 02 PM PDT           31.89            590         -              Normal
  05/13/2026 03 PM PDT           31.88            587         -              Normal
  05/13/2026 04 PM PDT           31.87            584         -              Normal
  05/13/2026 05 PM PDT           31.87            584         0              Normal
  05/13/2026 06 PM PDT           31.86            581         -              Normal
  05/13/2026 07 PM PDT           31.85            578         -              Normal
  05/13/2026 08 PM PDT           31.84            575         -              Normal
  05/13/2026 09 PM PDT           31.84            575         0              Normal
  05/13/2026 10 PM PDT           31.83            573         -              Normal
  05/13/2026 11 PM PDT           31.82            570         -              Normal
  05/14/2026 12 AM PDT           31.81            567         -              Normal
  05/14/2026 01 AM PDT           31.81            567         0              Normal
  05/14/2026 02 AM PDT           31.80            564         -              Normal
  05/14/2026 03 AM PDT           31.79            561         -              Normal
  05/14/2026 04 AM PDT           31.79            561         0              Normal
  05/14/2026 05 AM PDT           31.78            559         -              Normal
  05/14/2026 06 AM PDT           31.77            556         -              Normal
  05/14/2026 07 AM PDT           31.76            553         -              Normal
  05/14/2026 08 AM PDT           31.76            553         0              Normal
  05/14/2026 09 AM PDT           31.75            550         -              Normal
  05/14/2026 10 AM PDT           31.75            550         0              Normal
  05/14/2026 11 AM PDT           31.74            547         -              Normal
  05/14/2026 12 PM PDT           31.73            545         -              Normal
  05/14/2026 01 PM PDT           31.73            545         0              Normal
  05/14/2026 02 PM PDT           31.72            542         -              Normal
  05/14/2026 03 PM PDT           31.71            539         -              Normal
  05/14/2026 04 PM PDT           31.71            539         0              Normal
  05/14/2026 05 PM PDT           31.70            536         -              Normal
  05/14/2026 06 PM PDT           31.70            536         0              Normal
  05/14/2026 07 PM PDT           31.69            534         -              Normal
  05/14/2026 08 PM PDT           31.68            531         -              Normal
  05/14/2026 09 PM PDT           31.68            531         0              Normal
  05/14/2026 10 PM PDT           31.68            531         0              Normal
  05/14/2026 11 PM PDT           31.67            528         -              Normal
  05/15/2026 12 AM PDT           31.67            528         0              Normal
  05/15/2026 01 AM PDT           31.66            525         -              Normal
  05/15/2026 02 AM PDT           31.66            525         0              Normal
  05/15/2026 03 AM PDT           31.65            523         -              Normal
  05/15/2026 04 AM PDT           31.64            520         -              Normal
  05/15/2026 05 AM PDT           31.64            520         0              Normal
  05/15/2026 06 AM PDT           31.64            520         0              Normal
  05/15/2026 07 AM PDT           31.63            517         -              Normal
  05/15/2026 08 AM PDT           31.63            517         0              Normal
  05/15/2026 09 AM PDT           31.62            514         -              Normal
  05/15/2026 10 AM PDT           31.62            514         0              Normal
  05/15/2026 11 AM PDT           31.62            514         0              Normal
  05/15/2026 12 PM PDT           31.61            512         -              Normal
  05/15/2026 01 PM PDT           31.61            512         0              Normal
  05/15/2026 02 PM PDT           31.60            509         -              Normal
  05/15/2026 03 PM PDT           31.60            509         0              Normal
  05/15/2026 04 PM PDT           31.60            509         0              Normal
  05/15/2026 05 PM PDT           31.59            506         -              Normal
  05/15/2026 06 PM PDT           31.59            506         0              Normal
  05/15/2026 07 PM PDT           31.59            506         0              Normal
  05/15/2026 08 PM PDT           31.58            503         -              Normal
  05/15/2026 09 PM PDT           31.58            503         0              Normal
  05/15/2026 10 PM PDT           31.58            503         0              Normal
  05/15/2026 11 PM PDT           31.57            501         -              Normal
  05/16/2026 12 AM PDT           31.57            501         0              Normal
  05/16/2026 01 AM PDT           31.57            501         0              Normal
  05/16/2026 02 AM PDT           31.56            498         -              Normal
  05/16/2026 03 AM PDT           31.56            498         0              Normal
  05/16/2026 04 AM PDT           31.56            498         0              Normal
  05/16/2026 05 AM PDT           31.56            498         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.