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

 | 

MIDDLE FORK COSUMNES RIVER - SOMERSET (SOSC1)
Latitude: 38.62º NLongitude: 120.70º WElevation: 1821 Feet
Location: El Dorado County in CaliforniaBulletin Group: San JoaquinRiver Group: North San Joaquin
Issuance Time: May 18 2025 at 8:21 AM PDTNext Issuance: May 19 2025 at 9:00 AM PDT
Action/Monitor: N/A Minor Flood: N/A Moderate Flood: N/A Major Flood: N/A


# Tabular Observed and Forecast Hydrograph Information
#
# Location: Middle Fork Cosumnes River - Somerset (SOSC1)
#
# File Generation Time:  05/18/2025 at 08:22 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  05/13/2025 at 09:00 AM PDT
# Maximum Observed Stage:                       5.00 Feet
# Maximum Observed Flow:                        121 cfs
#
# Earliest Date & Time of Maximum Forecast:     05/18/2025 at 09:00 AM PDT
# Maximum Forecast Stage:                       4.75 Feet
# Maximum Forecast Flow:                        89 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  05/13/2025 08 AM PDT            5.00            121                Not Applicable
  05/13/2025 09 AM PDT            5.00            121         0      Not Applicable
  05/13/2025 10 AM PDT            4.99            120         -      Not Applicable
  05/13/2025 11 AM PDT            4.99            120         0      Not Applicable
  05/13/2025 12 PM PDT            4.99            120         0      Not Applicable
  05/13/2025 01 PM PDT            4.98            118         -      Not Applicable
  05/13/2025 02 PM PDT            4.98            118         0      Not Applicable
  05/13/2025 03 PM PDT            4.98            118         0      Not Applicable
  05/13/2025 04 PM PDT            4.97            117         -      Not Applicable
  05/13/2025 05 PM PDT            4.96            115         -      Not Applicable
  05/13/2025 06 PM PDT            4.96            115         0      Not Applicable
  05/13/2025 07 PM PDT            4.95            114         -      Not Applicable
  05/13/2025 08 PM PDT            4.95            114         0      Not Applicable
  05/13/2025 09 PM PDT            4.95            114         0      Not Applicable
  05/13/2025 10 PM PDT            4.95            114         0      Not Applicable
  05/13/2025 11 PM PDT            4.94            112         -      Not Applicable
  05/14/2025 12 AM PDT            4.94            112         0      Not Applicable
  05/14/2025 01 AM PDT            4.95            114         +      Not Applicable
  05/14/2025 02 AM PDT            4.95            114         0      Not Applicable
  05/14/2025 03 AM PDT            4.95            114         0      Not Applicable
  05/14/2025 04 AM PDT            4.94            112         -      Not Applicable
  05/14/2025 05 AM PDT            4.95            114         +      Not Applicable
  05/14/2025 06 AM PDT            4.95            114         0      Not Applicable
  05/14/2025 07 AM PDT            4.95            114         0      Not Applicable
  05/14/2025 08 AM PDT            4.95            114         0      Not Applicable
  05/14/2025 09 AM PDT            4.94            112         -      Not Applicable
  05/14/2025 10 AM PDT            4.94            112         0      Not Applicable
  05/14/2025 11 AM PDT            4.93            111         -      Not Applicable
  05/14/2025 12 PM PDT            4.92            110         -      Not Applicable
  05/14/2025 01 PM PDT            4.92            110         0      Not Applicable
  05/14/2025 02 PM PDT            4.91            108         -      Not Applicable
  05/14/2025 03 PM PDT            4.90            107         -      Not Applicable
  05/14/2025 04 PM PDT            4.90            107         0      Not Applicable
  05/14/2025 05 PM PDT            4.89            106         -      Not Applicable
  05/14/2025 06 PM PDT            4.88            105         -      Not Applicable
  05/14/2025 07 PM PDT            4.89            106         +      Not Applicable
  05/14/2025 08 PM PDT            4.88            105         -      Not Applicable
  05/14/2025 09 PM PDT            4.87            103         -      Not Applicable
  05/14/2025 10 PM PDT            4.87            103         0      Not Applicable
  05/14/2025 11 PM PDT            4.86            102         -      Not Applicable
  05/15/2025 12 AM PDT            4.86            102         0      Not Applicable
  05/15/2025 01 AM PDT            4.86            102         0      Not Applicable
  05/15/2025 02 AM PDT            4.85            101         -      Not Applicable
  05/15/2025 03 AM PDT            4.86            102         +      Not Applicable
  05/15/2025 04 AM PDT            4.85            101         -      Not Applicable
  05/15/2025 05 AM PDT            4.86            102         +      Not Applicable
  05/15/2025 06 AM PDT            4.85            101         -      Not Applicable
  05/15/2025 07 AM PDT            4.86            102         +      Not Applicable
  05/15/2025 08 AM PDT            4.86            102         0      Not Applicable
  05/15/2025 09 AM PDT            4.86            102         0      Not Applicable
  05/15/2025 10 AM PDT            4.85            101         -      Not Applicable
  05/15/2025 11 AM PDT            4.86            102         +      Not Applicable
  05/15/2025 12 PM PDT            4.85            101         -      Not Applicable
  05/15/2025 01 PM PDT            4.85            101         0      Not Applicable
  05/15/2025 02 PM PDT            4.84            100         -      Not Applicable
  05/15/2025 03 PM PDT            4.85            101         +      Not Applicable
  05/15/2025 04 PM PDT            4.84            100         -      Not Applicable
  05/15/2025 05 PM PDT            4.84            100         0      Not Applicable
  05/15/2025 06 PM PDT            4.83             98         -      Not Applicable
  05/15/2025 07 PM PDT            4.82             97         -      Not Applicable
  05/15/2025 08 PM PDT            4.83             98         +      Not Applicable
  05/15/2025 09 PM PDT            4.82             97         -      Not Applicable
  05/15/2025 10 PM PDT            4.82             97         0      Not Applicable
  05/15/2025 11 PM PDT            4.81             96         -      Not Applicable
  05/16/2025 12 AM PDT            4.80             95         -      Not Applicable
  05/16/2025 01 AM PDT            4.80             95         0      Not Applicable
  05/16/2025 02 AM PDT            4.79             94         -      Not Applicable
  05/16/2025 03 AM PDT            4.79             94         0      Not Applicable
  05/16/2025 04 AM PDT            4.79             94         0      Not Applicable
  05/16/2025 05 AM PDT            4.79             94         0      Not Applicable
  05/16/2025 06 AM PDT            4.81             96         +      Not Applicable
  05/16/2025 07 AM PDT            4.81             96         0      Not Applicable
  05/16/2025 08 AM PDT            4.82             97         +      Not Applicable
  05/16/2025 09 AM PDT            4.82             97         0      Not Applicable
  05/16/2025 10 AM PDT            4.82             97         0      Not Applicable
  05/16/2025 11 AM PDT            4.82             97         0      Not Applicable
  05/16/2025 12 PM PDT            4.82             97         0      Not Applicable
  05/16/2025 01 PM PDT            4.81             96         -      Not Applicable
  05/16/2025 02 PM PDT            4.81             96         0      Not Applicable
  05/16/2025 03 PM PDT            4.80             95         -      Not Applicable
  05/16/2025 04 PM PDT            4.80             95         0      Not Applicable
  05/16/2025 05 PM PDT            4.80             95         0      Not Applicable
  05/16/2025 06 PM PDT            4.80             95         0      Not Applicable
  05/16/2025 07 PM PDT            4.79             94         -      Not Applicable
  05/16/2025 08 PM PDT            4.79             94         0      Not Applicable
  05/16/2025 09 PM PDT            4.78             92         -      Not Applicable
  05/16/2025 10 PM PDT            4.78             92         0      Not Applicable
  05/16/2025 11 PM PDT            4.78             92         0      Not Applicable
  05/17/2025 12 AM PDT            4.77             91         -      Not Applicable
  05/17/2025 01 AM PDT            4.77             91         0      Not Applicable
  05/17/2025 02 AM PDT            4.76             90         -      Not Applicable
  05/17/2025 03 AM PDT            4.76             90         0      Not Applicable
  05/17/2025 04 AM PDT            4.76             90         0      Not Applicable
  05/17/2025 05 AM PDT            4.76             90         0      Not Applicable
  05/17/2025 06 AM PDT            4.77             91         +      Not Applicable
  05/17/2025 07 AM PDT            4.77             91         0      Not Applicable
  05/17/2025 08 AM PDT            4.79             94         +      Not Applicable
  05/17/2025 09 AM PDT            4.79             94         0      Not Applicable
  05/17/2025 10 AM PDT            4.80             95         +      Not Applicable
  05/17/2025 11 AM PDT            4.80             95         0      Not Applicable
  05/17/2025 12 PM PDT            4.79             94         -      Not Applicable
  05/17/2025 01 PM PDT            4.78             92         -      Not Applicable
  05/17/2025 02 PM PDT            4.79             94         +      Not Applicable
  05/17/2025 03 PM PDT            4.79             94         0      Not Applicable
  05/17/2025 04 PM PDT            4.78             92         -      Not Applicable
  05/17/2025 05 PM PDT            4.77             91         -      Not Applicable
  05/17/2025 06 PM PDT            4.78             92         +      Not Applicable
  05/17/2025 07 PM PDT            4.77             91         -      Not Applicable
  05/17/2025 08 PM PDT            4.77             91         0      Not Applicable
  05/17/2025 09 PM PDT            4.76             90         -      Not Applicable
  05/17/2025 10 PM PDT            4.76             90         0      Not Applicable
  05/17/2025 11 PM PDT            4.76             90         0      Not Applicable
  05/18/2025 12 AM PDT            4.76             90         0      Not Applicable
  05/18/2025 01 AM PDT            4.76             90         0      Not Applicable
  05/18/2025 02 AM PDT            4.75             89         -      Not Applicable
  05/18/2025 03 AM PDT            4.75             89         0      Not Applicable
  05/18/2025 04 AM PDT            4.75             89         0      Not Applicable
  05/18/2025 05 AM PDT            4.75             89         0      Not Applicable
  05/18/2025 06 AM PDT            4.75             89         0      Not Applicable
  05/18/2025 07 AM PDT            4.75             89         0      Not Applicable
  05/18/2025 08 AM PDT            4.75             89         0      Not Applicable
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  05/18/2025 09 AM PDT            4.75             89                Not Applicable
  05/18/2025 10 AM PDT            4.74             88         -      Not Applicable
  05/18/2025 11 AM PDT            4.74             88         0      Not Applicable
  05/18/2025 12 PM PDT            4.74             88         0      Not Applicable
  05/18/2025 01 PM PDT            4.74             88         0      Not Applicable
  05/18/2025 02 PM PDT            4.74             88         0      Not Applicable
  05/18/2025 03 PM PDT            4.74             88         0      Not Applicable
  05/18/2025 04 PM PDT            4.74             88         0      Not Applicable
  05/18/2025 05 PM PDT            4.73             86         -      Not Applicable
  05/18/2025 06 PM PDT            4.73             86         0      Not Applicable
  05/18/2025 07 PM PDT            4.73             86         0      Not Applicable
  05/18/2025 08 PM PDT            4.73             86         0      Not Applicable
  05/18/2025 09 PM PDT            4.73             86         0      Not Applicable
  05/18/2025 10 PM PDT            4.73             86         0      Not Applicable
  05/18/2025 11 PM PDT            4.73             86         0      Not Applicable
  05/19/2025 12 AM PDT            4.73             86         0      Not Applicable
  05/19/2025 01 AM PDT            4.73             86         0      Not Applicable
  05/19/2025 02 AM PDT            4.73             86         0      Not Applicable
  05/19/2025 03 AM PDT            4.73             86         0      Not Applicable
  05/19/2025 04 AM PDT            4.73             86         0      Not Applicable
  05/19/2025 05 AM PDT            4.73             86         0      Not Applicable
  05/19/2025 06 AM PDT            4.72             85         -      Not Applicable
  05/19/2025 07 AM PDT            4.72             85         0      Not Applicable
  05/19/2025 08 AM PDT            4.72             85         0      Not Applicable
  05/19/2025 09 AM PDT            4.72             85         0      Not Applicable
  05/19/2025 10 AM PDT            4.72             85         0      Not Applicable
  05/19/2025 11 AM PDT            4.72             85         0      Not Applicable
  05/19/2025 12 PM PDT            4.72             85         0      Not Applicable
  05/19/2025 01 PM PDT            4.72             85         0      Not Applicable
  05/19/2025 02 PM PDT            4.71             84         -      Not Applicable
  05/19/2025 03 PM PDT            4.71             84         0      Not Applicable
  05/19/2025 04 PM PDT            4.71             84         0      Not Applicable
  05/19/2025 05 PM PDT            4.71             84         0      Not Applicable
  05/19/2025 06 PM PDT            4.71             84         0      Not Applicable
  05/19/2025 07 PM PDT            4.71             84         0      Not Applicable
  05/19/2025 08 PM PDT            4.71             84         0      Not Applicable
  05/19/2025 09 PM PDT            4.71             84         0      Not Applicable
  05/19/2025 10 PM PDT            4.71             84         0      Not Applicable
  05/19/2025 11 PM PDT            4.71             84         0      Not Applicable
  05/20/2025 12 AM PDT            4.71             84         0      Not Applicable
  05/20/2025 01 AM PDT            4.71             84         0      Not Applicable
  05/20/2025 02 AM PDT            4.71             84         0      Not Applicable
  05/20/2025 03 AM PDT            4.71             84         0      Not Applicable
  05/20/2025 04 AM PDT            4.71             84         0      Not Applicable
  05/20/2025 05 AM PDT            4.71             84         0      Not Applicable
  05/20/2025 06 AM PDT            4.71             84         0      Not Applicable
  05/20/2025 07 AM PDT            4.70             83         -      Not Applicable
  05/20/2025 08 AM PDT            4.70             83         0      Not Applicable
  05/20/2025 09 AM PDT            4.70             83         0      Not Applicable
  05/20/2025 10 AM PDT            4.70             83         0      Not Applicable
  05/20/2025 11 AM PDT            4.70             83         0      Not Applicable
  05/20/2025 12 PM PDT            4.70             83         0      Not Applicable
  05/20/2025 01 PM PDT            4.70             83         0      Not Applicable
  05/20/2025 02 PM PDT            4.70             83         0      Not Applicable
  05/20/2025 03 PM PDT            4.69             82         -      Not Applicable
  05/20/2025 04 PM PDT            4.69             82         0      Not Applicable
  05/20/2025 05 PM PDT            4.69             82         0      Not Applicable
  05/20/2025 06 PM PDT            4.69             82         0      Not Applicable
  05/20/2025 07 PM PDT            4.69             82         0      Not Applicable
  05/20/2025 08 PM PDT            4.69             82         0      Not Applicable
  05/20/2025 09 PM PDT            4.69             82         0      Not Applicable
  05/20/2025 10 PM PDT            4.69             82         0      Not Applicable
  05/20/2025 11 PM PDT            4.69             82         0      Not Applicable
  05/21/2025 12 AM PDT            4.69             82         0      Not Applicable
  05/21/2025 01 AM PDT            4.69             82         0      Not Applicable
  05/21/2025 02 AM PDT            4.69             82         0      Not Applicable
  05/21/2025 03 AM PDT            4.69             82         0      Not Applicable
  05/21/2025 04 AM PDT            4.69             82         0      Not Applicable
  05/21/2025 05 AM PDT            4.69             82         0      Not Applicable
  05/21/2025 06 AM PDT            4.69             82         0      Not Applicable
  05/21/2025 07 AM PDT            4.68             81         -      Not Applicable
  05/21/2025 08 AM PDT            4.68             81         0      Not Applicable
  05/21/2025 09 AM PDT            4.68             81         0      Not Applicable
  05/21/2025 10 AM PDT            4.68             81         0      Not Applicable
  05/21/2025 11 AM PDT            4.68             81         0      Not Applicable
  05/21/2025 12 PM PDT            4.68             81         0      Not Applicable
  05/21/2025 01 PM PDT            4.68             81         0      Not Applicable
  05/21/2025 02 PM PDT            4.68             81         0      Not Applicable
  05/21/2025 03 PM PDT            4.68             81         0      Not Applicable
  05/21/2025 04 PM PDT            4.68             81         0      Not Applicable
  05/21/2025 05 PM PDT            4.68             81         0      Not Applicable
  05/21/2025 06 PM PDT            4.67             80         -      Not Applicable
  05/21/2025 07 PM PDT            4.67             80         0      Not Applicable
  05/21/2025 08 PM PDT            4.67             80         0      Not Applicable
  05/21/2025 09 PM PDT            4.67             80         0      Not Applicable
  05/21/2025 10 PM PDT            4.67             80         0      Not Applicable
  05/21/2025 11 PM PDT            4.67             80         0      Not Applicable
  05/22/2025 12 AM PDT            4.67             80         0      Not Applicable
  05/22/2025 01 AM PDT            4.67             80         0      Not Applicable
  05/22/2025 02 AM PDT            4.67             80         0      Not Applicable
  05/22/2025 03 AM PDT            4.67             80         0      Not Applicable
  05/22/2025 04 AM PDT            4.66             78         -      Not Applicable
  05/22/2025 05 AM PDT            4.66             78         0      Not Applicable
  05/22/2025 06 AM PDT            4.66             78         0      Not Applicable
  05/22/2025 07 AM PDT            4.66             78         0      Not Applicable
  05/22/2025 08 AM PDT            4.66             78         0      Not Applicable
  05/22/2025 09 AM PDT            4.66             78         0      Not Applicable
  05/22/2025 10 AM PDT            4.66             78         0      Not Applicable
  05/22/2025 11 AM PDT            4.65             77         -      Not Applicable
  05/22/2025 12 PM PDT            4.65             77         0      Not Applicable
  05/22/2025 01 PM PDT            4.65             77         0      Not Applicable
  05/22/2025 02 PM PDT            4.65             77         0      Not Applicable
  05/22/2025 03 PM PDT            4.65             77         0      Not Applicable
  05/22/2025 04 PM PDT            4.65             77         0      Not Applicable
  05/22/2025 05 PM PDT            4.65             77         0      Not Applicable
  05/22/2025 06 PM PDT            4.65             77         0      Not Applicable
  05/22/2025 07 PM PDT            4.65             77         0      Not Applicable
  05/22/2025 08 PM PDT            4.65             77         0      Not Applicable
  05/22/2025 09 PM PDT            4.65             77         0      Not Applicable
  05/22/2025 10 PM PDT            4.64             76         -      Not Applicable
  05/22/2025 11 PM PDT            4.64             76         0      Not Applicable
  05/23/2025 12 AM PDT            4.64             76         0      Not Applicable
  05/23/2025 01 AM PDT            4.64             76         0      Not Applicable
  05/23/2025 02 AM PDT            4.64             76         0      Not Applicable
  05/23/2025 03 AM PDT            4.64             76         0      Not Applicable
  05/23/2025 04 AM PDT            4.64             76         0      Not Applicable
  05/23/2025 05 AM PDT            4.64             76         0      Not Applicable
#
# 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.