MATTOLE RIVER - ETTERSBURG (ETTC1)
Latitude: 40.14º NLongitude: 123.99º WElevation: 579 FeetForecast Type: Unofficial Location
Location: Humboldt County in CaliforniaBulletin Group: North CoastRiver Group: North Coast
Issuance Time: Mar 23 2026 at 1:07 PM PDTNext Issuance: Mar 24 2026 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: Mattole River - Ettersburg (ETTC1)
#
# File Generation Time:  03/23/2026 at 01:10 PM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  03/18/2026 at 06:00 PM PDT
# Maximum Observed Stage:                       9.45 Feet
# Maximum Observed Flow:                        100 cfs
#
# Earliest Date & Time of Maximum Forecast:     03/23/2026 at 02:00 PM PDT
# Maximum Forecast Stage:                       9.29 Feet
# Maximum Forecast Flow:                        77 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  03/18/2026 01 PM PDT            9.45            100                Not Applicable
  03/18/2026 02 PM PDT            9.45            100         0      Not Applicable
  03/18/2026 03 PM PDT            9.45            100         0      Not Applicable
  03/18/2026 04 PM PDT            9.45            100         0      Not Applicable
  03/18/2026 05 PM PDT            9.44             98         -      Not Applicable
  03/18/2026 06 PM PDT            9.45            100         +      Not Applicable
  03/18/2026 07 PM PDT            9.44             98         -      Not Applicable
  03/18/2026 08 PM PDT            9.44             98         0      Not Applicable
  03/18/2026 09 PM PDT            9.43             97         -      Not Applicable
  03/18/2026 10 PM PDT            9.43             97         0      Not Applicable
  03/18/2026 11 PM PDT            9.43             97         0      Not Applicable
  03/19/2026 12 AM PDT            9.42             95         -      Not Applicable
  03/19/2026 01 AM PDT            9.42             95         0      Not Applicable
  03/19/2026 02 AM PDT            9.42             95         0      Not Applicable
  03/19/2026 03 AM PDT            9.41             94         -      Not Applicable
  03/19/2026 04 AM PDT            9.42             95         +      Not Applicable
  03/19/2026 05 AM PDT            9.42             95         0      Not Applicable
  03/19/2026 06 AM PDT            9.41             94         -      Not Applicable
  03/19/2026 07 AM PDT            9.41             94         0      Not Applicable
  03/19/2026 08 AM PDT            9.41             94         0      Not Applicable
  03/19/2026 09 AM PDT            9.41             94         0      Not Applicable
  03/19/2026 10 AM PDT            9.40             92         -      Not Applicable
  03/19/2026 11 AM PDT            9.41             94         +      Not Applicable
  03/19/2026 12 PM PDT            9.41             94         0      Not Applicable
  03/19/2026 01 PM PDT            9.41             94         0      Not Applicable
  03/19/2026 02 PM PDT            9.41             94         0      Not Applicable
  03/19/2026 03 PM PDT            9.41             94         0      Not Applicable
  03/19/2026 04 PM PDT            9.41             94         0      Not Applicable
  03/19/2026 05 PM PDT            9.41             94         0      Not Applicable
  03/19/2026 06 PM PDT            9.41             94         0      Not Applicable
  03/19/2026 07 PM PDT            9.40             92         -      Not Applicable
  03/19/2026 08 PM PDT            9.40             92         0      Not Applicable
  03/19/2026 09 PM PDT            9.40             92         0      Not Applicable
  03/19/2026 10 PM PDT            9.40             92         0      Not Applicable
  03/19/2026 11 PM PDT            9.39             91         -      Not Applicable
  03/20/2026 12 AM PDT            9.38             89         -      Not Applicable
  03/20/2026 01 AM PDT            9.39             91         +      Not Applicable
  03/20/2026 02 AM PDT            9.38             89         -      Not Applicable
  03/20/2026 03 AM PDT            9.39             91         +      Not Applicable
  03/20/2026 04 AM PDT            9.38             89         -      Not Applicable
  03/20/2026 05 AM PDT            9.38             89         0      Not Applicable
  03/20/2026 06 AM PDT            9.38             89         0      Not Applicable
  03/20/2026 07 AM PDT            9.38             89         0      Not Applicable
  03/20/2026 08 AM PDT            9.37             88         -      Not Applicable
  03/20/2026 09 AM PDT            9.37             88         0      Not Applicable
  03/20/2026 10 AM PDT            9.37             88         0      Not Applicable
  03/20/2026 11 AM PDT            9.38             89         +      Not Applicable
  03/20/2026 12 PM PDT            9.37             88         -      Not Applicable
  03/20/2026 01 PM PDT            9.38             89         +      Not Applicable
  03/20/2026 02 PM PDT            9.38             89         0      Not Applicable
  03/20/2026 03 PM PDT            9.38             89         0      Not Applicable
  03/20/2026 04 PM PDT            9.38             89         0      Not Applicable
  03/20/2026 05 PM PDT            9.37             88         -      Not Applicable
  03/20/2026 06 PM PDT            9.37             88         0      Not Applicable
  03/20/2026 07 PM PDT            9.38             89         +      Not Applicable
  03/20/2026 08 PM PDT            9.38             89         0      Not Applicable
  03/20/2026 09 PM PDT            9.37             88         -      Not Applicable
  03/20/2026 10 PM PDT            9.36             86         -      Not Applicable
  03/20/2026 11 PM PDT            9.36             86         0      Not Applicable
  03/21/2026 12 AM PDT            9.36             86         0      Not Applicable
  03/21/2026 01 AM PDT            9.36             86         0      Not Applicable
  03/21/2026 02 AM PDT            9.35             85         -      Not Applicable
  03/21/2026 03 AM PDT            9.36             86         +      Not Applicable
  03/21/2026 04 AM PDT            9.35             85         -      Not Applicable
  03/21/2026 05 AM PDT            9.35             85         0      Not Applicable
  03/21/2026 06 AM PDT            9.35             85         0      Not Applicable
  03/21/2026 07 AM PDT            9.35             85         0      Not Applicable
  03/21/2026 08 AM PDT            9.35             85         0      Not Applicable
  03/21/2026 09 AM PDT            9.35             85         0      Not Applicable
  03/21/2026 10 AM PDT            9.35             85         0      Not Applicable
  03/21/2026 11 AM PDT            9.35             85         0      Not Applicable
  03/21/2026 12 PM PDT            9.35             85         0      Not Applicable
  03/21/2026 01 PM PDT            9.35             85         0      Not Applicable
  03/21/2026 02 PM PDT            9.35             85         0      Not Applicable
  03/21/2026 03 PM PDT            9.35             85         0      Not Applicable
  03/21/2026 04 PM PDT            9.35             85         0      Not Applicable
  03/21/2026 05 PM PDT            9.34             83         -      Not Applicable
  03/21/2026 06 PM PDT            9.34             83         0      Not Applicable
  03/21/2026 07 PM PDT            9.34             83         0      Not Applicable
  03/21/2026 08 PM PDT            9.33             82         -      Not Applicable
  03/21/2026 09 PM PDT            9.33             82         0      Not Applicable
  03/21/2026 10 PM PDT            9.33             82         0      Not Applicable
  03/21/2026 11 PM PDT            9.33             82         0      Not Applicable
  03/22/2026 12 AM PDT            9.32             80         -      Not Applicable
  03/22/2026 01 AM PDT            9.32             80         0      Not Applicable
  03/22/2026 02 AM PDT            9.32             80         0      Not Applicable
  03/22/2026 03 AM PDT            9.32             80         0      Not Applicable
  03/22/2026 04 AM PDT            9.31             79         -      Not Applicable
  03/22/2026 05 AM PDT            9.31             79         0      Not Applicable
  03/22/2026 06 AM PDT            9.31             79         0      Not Applicable
  03/22/2026 07 AM PDT            9.31             79         0      Not Applicable
  03/22/2026 08 AM PDT            9.31             79         0      Not Applicable
  03/22/2026 09 AM PDT            9.31             79         0      Not Applicable
  03/22/2026 10 AM PDT            9.31             79         0      Not Applicable
  03/22/2026 11 AM PDT            9.31             79         0      Not Applicable
  03/22/2026 12 PM PDT            9.31             79         0      Not Applicable
  03/22/2026 01 PM PDT            9.32             80         +      Not Applicable
  03/22/2026 02 PM PDT            9.32             80         0      Not Applicable
  03/22/2026 03 PM PDT            9.32             80         0      Not Applicable
  03/22/2026 04 PM PDT            9.32             80         0      Not Applicable
  03/22/2026 05 PM PDT            9.32             80         0      Not Applicable
  03/22/2026 06 PM PDT            9.31             79         -      Not Applicable
  03/22/2026 07 PM PDT            9.31             79         0      Not Applicable
  03/22/2026 08 PM PDT            9.31             79         0      Not Applicable
  03/22/2026 09 PM PDT            9.30             78         -      Not Applicable
  03/22/2026 10 PM PDT            9.30             78         0      Not Applicable
  03/22/2026 11 PM PDT            9.31             79         +      Not Applicable
  03/23/2026 12 AM PDT            9.30             78         -      Not Applicable
  03/23/2026 01 AM PDT            9.30             78         0      Not Applicable
  03/23/2026 02 AM PDT            9.29             77         -      Not Applicable
  03/23/2026 03 AM PDT            9.29             77         0      Not Applicable
  03/23/2026 04 AM PDT            9.29             77         0      Not Applicable
  03/23/2026 05 AM PDT            9.29             77         0      Not Applicable
  03/23/2026 06 AM PDT            9.29             77         0      Not Applicable
  03/23/2026 07 AM PDT            9.28             75         -      Not Applicable
  03/23/2026 08 AM PDT            9.28             75         0      Not Applicable
  03/23/2026 09 AM PDT            9.28             75         0      Not Applicable
  03/23/2026 10 AM PDT            9.29             77         +      Not Applicable
  03/23/2026 11 AM PDT            9.29             77         0      Not Applicable
  03/23/2026 12 PM PDT            9.29             77         0      Not Applicable
  03/23/2026 01 PM PDT            9.29             77         0      Not Applicable
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  03/23/2026 02 PM PDT            9.29             77                Not Applicable
  03/23/2026 03 PM PDT            9.29             77         0      Not Applicable
  03/23/2026 04 PM PDT            9.29             77         0      Not Applicable
  03/23/2026 05 PM PDT            9.29             77         0      Not Applicable
  03/23/2026 06 PM PDT            9.29             77         0      Not Applicable
  03/23/2026 07 PM PDT            9.29             77         0      Not Applicable
  03/23/2026 08 PM PDT            9.29             77         0      Not Applicable
  03/23/2026 09 PM PDT            9.28             75         -      Not Applicable
  03/23/2026 10 PM PDT            9.28             75         0      Not Applicable
  03/23/2026 11 PM PDT            9.28             75         0      Not Applicable
  03/24/2026 12 AM PDT            9.28             75         0      Not Applicable
  03/24/2026 01 AM PDT            9.28             75         0      Not Applicable
  03/24/2026 02 AM PDT            9.28             75         0      Not Applicable
  03/24/2026 03 AM PDT            9.28             75         0      Not Applicable
  03/24/2026 04 AM PDT            9.28             75         0      Not Applicable
  03/24/2026 05 AM PDT            9.28             75         0      Not Applicable
  03/24/2026 06 AM PDT            9.28             75         0      Not Applicable
  03/24/2026 07 AM PDT            9.28             75         0      Not Applicable
  03/24/2026 08 AM PDT            9.28             75         0      Not Applicable
  03/24/2026 09 AM PDT            9.28             75         0      Not Applicable
  03/24/2026 10 AM PDT            9.28             75         0      Not Applicable
  03/24/2026 11 AM PDT            9.28             75         0      Not Applicable
  03/24/2026 12 PM PDT            9.28             75         0      Not Applicable
  03/24/2026 01 PM PDT            9.28             75         0      Not Applicable
  03/24/2026 02 PM PDT            9.28             75         0      Not Applicable
  03/24/2026 03 PM PDT            9.27             74         -      Not Applicable
  03/24/2026 04 PM PDT            9.27             74         0      Not Applicable
  03/24/2026 05 PM PDT            9.27             74         0      Not Applicable
  03/24/2026 06 PM PDT            9.27             74         0      Not Applicable
  03/24/2026 07 PM PDT            9.27             74         0      Not Applicable
  03/24/2026 08 PM PDT            9.27             74         0      Not Applicable
  03/24/2026 09 PM PDT            9.27             74         0      Not Applicable
  03/24/2026 10 PM PDT            9.27             74         0      Not Applicable
  03/24/2026 11 PM PDT            9.27             74         0      Not Applicable
  03/25/2026 12 AM PDT            9.27             74         0      Not Applicable
  03/25/2026 01 AM PDT            9.27             74         0      Not Applicable
  03/25/2026 02 AM PDT            9.27             74         0      Not Applicable
  03/25/2026 03 AM PDT            9.27             74         0      Not Applicable
  03/25/2026 04 AM PDT            9.27             74         0      Not Applicable
  03/25/2026 05 AM PDT            9.27             74         0      Not Applicable
  03/25/2026 06 AM PDT            9.27             74         0      Not Applicable
  03/25/2026 07 AM PDT            9.27             74         0      Not Applicable
  03/25/2026 08 AM PDT            9.27             74         0      Not Applicable
  03/25/2026 09 AM PDT            9.27             74         0      Not Applicable
  03/25/2026 10 AM PDT            9.27             74         0      Not Applicable
  03/25/2026 11 AM PDT            9.27             74         0      Not Applicable
  03/25/2026 12 PM PDT            9.27             74         0      Not Applicable
  03/25/2026 01 PM PDT            9.27             74         0      Not Applicable
  03/25/2026 02 PM PDT            9.27             74         0      Not Applicable
  03/25/2026 03 PM PDT            9.27             74         0      Not Applicable
  03/25/2026 04 PM PDT            9.26             73         -      Not Applicable
  03/25/2026 05 PM PDT            9.26             73         0      Not Applicable
  03/25/2026 06 PM PDT            9.26             73         0      Not Applicable
  03/25/2026 07 PM PDT            9.26             73         0      Not Applicable
  03/25/2026 08 PM PDT            9.26             73         0      Not Applicable
  03/25/2026 09 PM PDT            9.26             73         0      Not Applicable
  03/25/2026 10 PM PDT            9.26             73         0      Not Applicable
  03/25/2026 11 PM PDT            9.26             73         0      Not Applicable
  03/26/2026 12 AM PDT            9.26             73         0      Not Applicable
  03/26/2026 01 AM PDT            9.26             73         0      Not Applicable
  03/26/2026 02 AM PDT            9.26             73         0      Not Applicable
  03/26/2026 03 AM PDT            9.26             73         0      Not Applicable
  03/26/2026 04 AM PDT            9.26             73         0      Not Applicable
  03/26/2026 05 AM PDT            9.26             73         0      Not Applicable
  03/26/2026 06 AM PDT            9.26             73         0      Not Applicable
  03/26/2026 07 AM PDT            9.26             73         0      Not Applicable
  03/26/2026 08 AM PDT            9.26             73         0      Not Applicable
  03/26/2026 09 AM PDT            9.26             73         0      Not Applicable
  03/26/2026 10 AM PDT            9.25             71         -      Not Applicable
  03/26/2026 11 AM PDT            9.25             71         0      Not Applicable
  03/26/2026 12 PM PDT            9.25             71         0      Not Applicable
  03/26/2026 01 PM PDT            9.25             71         0      Not Applicable
  03/26/2026 02 PM PDT            9.25             71         0      Not Applicable
  03/26/2026 03 PM PDT            9.25             71         0      Not Applicable
  03/26/2026 04 PM PDT            9.25             71         0      Not Applicable
  03/26/2026 05 PM PDT            9.25             71         0      Not Applicable
  03/26/2026 06 PM PDT            9.25             71         0      Not Applicable
  03/26/2026 07 PM PDT            9.25             71         0      Not Applicable
  03/26/2026 08 PM PDT            9.25             71         0      Not Applicable
  03/26/2026 09 PM PDT            9.25             71         0      Not Applicable
  03/26/2026 10 PM PDT            9.25             71         0      Not Applicable
  03/26/2026 11 PM PDT            9.25             71         0      Not Applicable
  03/27/2026 12 AM PDT            9.25             71         0      Not Applicable
  03/27/2026 01 AM PDT            9.25             71         0      Not Applicable
  03/27/2026 02 AM PDT            9.25             71         0      Not Applicable
  03/27/2026 03 AM PDT            9.25             71         0      Not Applicable
  03/27/2026 04 AM PDT            9.25             71         0      Not Applicable
  03/27/2026 05 AM PDT            9.25             71         0      Not Applicable
  03/27/2026 06 AM PDT            9.25             71         0      Not Applicable
  03/27/2026 07 AM PDT            9.25             71         0      Not Applicable
  03/27/2026 08 AM PDT            9.24             70         -      Not Applicable
  03/27/2026 09 AM PDT            9.24             70         0      Not Applicable
  03/27/2026 10 AM PDT            9.24             70         0      Not Applicable
  03/27/2026 11 AM PDT            9.24             70         0      Not Applicable
  03/27/2026 12 PM PDT            9.24             70         0      Not Applicable
  03/27/2026 01 PM PDT            9.24             70         0      Not Applicable
  03/27/2026 02 PM PDT            9.24             70         0      Not Applicable
  03/27/2026 03 PM PDT            9.24             70         0      Not Applicable
  03/27/2026 04 PM PDT            9.24             70         0      Not Applicable
  03/27/2026 05 PM PDT            9.24             70         0      Not Applicable
  03/27/2026 06 PM PDT            9.24             70         0      Not Applicable
  03/27/2026 07 PM PDT            9.24             70         0      Not Applicable
  03/27/2026 08 PM PDT            9.24             70         0      Not Applicable
  03/27/2026 09 PM PDT            9.24             70         0      Not Applicable
  03/27/2026 10 PM PDT            9.24             70         0      Not Applicable
  03/27/2026 11 PM PDT            9.24             70         0      Not Applicable
  03/28/2026 12 AM PDT            9.24             70         0      Not Applicable
  03/28/2026 01 AM PDT            9.24             70         0      Not Applicable
  03/28/2026 02 AM PDT            9.24             70         0      Not Applicable
  03/28/2026 03 AM PDT            9.24             70         0      Not Applicable
  03/28/2026 04 AM PDT            9.24             70         0      Not Applicable
  03/28/2026 05 AM PDT            9.24             70         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.