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: Apr 08 2026 at 1:43 PM PDTNext Issuance: Apr 09 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:  04/08/2026 at 01:45 PM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  04/03/2026 at 02:00 PM PDT
# Maximum Observed Stage:                       9.35 Feet
# Maximum Observed Flow:                        85 cfs
#
# Earliest Date & Time of Maximum Forecast:     04/11/2026 at 10:00 PM PDT
# Maximum Forecast Stage:                       11.69 Feet
# Maximum Forecast Flow:                        654 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  04/03/2026 01 PM PDT            9.35             85                Not Applicable
  04/03/2026 02 PM PDT            9.35             85         0      Not Applicable
  04/03/2026 03 PM PDT            9.34             83         -      Not Applicable
  04/03/2026 04 PM PDT            9.33             82         -      Not Applicable
  04/03/2026 05 PM PDT            9.33             82         0      Not Applicable
  04/03/2026 06 PM PDT            9.33             82         0      Not Applicable
  04/03/2026 07 PM PDT            9.32             80         -      Not Applicable
  04/03/2026 08 PM PDT            9.31             79         -      Not Applicable
  04/03/2026 09 PM PDT            9.31             79         0      Not Applicable
  04/03/2026 10 PM PDT            9.31             79         0      Not Applicable
  04/03/2026 11 PM PDT            9.29             77         -      Not Applicable
  04/04/2026 12 AM PDT            9.30             78         +      Not Applicable
  04/04/2026 01 AM PDT            9.28             75         -      Not Applicable
  04/04/2026 02 AM PDT            9.28             75         0      Not Applicable
  04/04/2026 03 AM PDT            9.28             75         0      Not Applicable
  04/04/2026 04 AM PDT            9.28             75         0      Not Applicable
  04/04/2026 05 AM PDT            9.27             74         -      Not Applicable
  04/04/2026 06 AM PDT            9.27             74         0      Not Applicable
  04/04/2026 07 AM PDT            9.26             73         -      Not Applicable
  04/04/2026 08 AM PDT            9.26             73         0      Not Applicable
  04/04/2026 09 AM PDT            9.26             73         0      Not Applicable
  04/04/2026 10 AM PDT            9.26             73         0      Not Applicable
  04/04/2026 11 AM PDT            9.26             73         0      Not Applicable
  04/04/2026 12 PM PDT            9.26             73         0      Not Applicable
  04/04/2026 01 PM PDT            9.26             73         0      Not Applicable
  04/04/2026 02 PM PDT            9.26             73         0      Not Applicable
  04/04/2026 03 PM PDT            9.25             71         -      Not Applicable
  04/04/2026 04 PM PDT            9.25             71         0      Not Applicable
  04/04/2026 05 PM PDT            9.25             71         0      Not Applicable
  04/04/2026 06 PM PDT            9.24             70         -      Not Applicable
  04/04/2026 07 PM PDT            9.24             70         0      Not Applicable
  04/04/2026 08 PM PDT            9.24             70         0      Not Applicable
  04/04/2026 09 PM PDT            9.23             69         -      Not Applicable
  04/04/2026 10 PM PDT            9.23             69         0      Not Applicable
  04/04/2026 11 PM PDT            9.23             69         0      Not Applicable
  04/05/2026 12 AM PDT            9.23             69         0      Not Applicable
  04/05/2026 01 AM PDT            9.22             68         -      Not Applicable
  04/05/2026 02 AM PDT            9.22             68         0      Not Applicable
  04/05/2026 03 AM PDT            9.22             68         0      Not Applicable
  04/05/2026 04 AM PDT            9.21             67         -      Not Applicable
  04/05/2026 05 AM PDT            9.21             67         0      Not Applicable
  04/05/2026 06 AM PDT            9.21             67         0      Not Applicable
  04/05/2026 07 AM PDT            9.20             66         -      Not Applicable
  04/05/2026 08 AM PDT            9.20             66         0      Not Applicable
  04/05/2026 09 AM PDT            9.20             66         0      Not Applicable
  04/05/2026 10 AM PDT            9.20             66         0      Not Applicable
  04/05/2026 11 AM PDT            9.20             66         0      Not Applicable
  04/05/2026 12 PM PDT            9.21             67         +      Not Applicable
  04/05/2026 01 PM PDT            9.21             67         0      Not Applicable
  04/05/2026 02 PM PDT            9.20             66         -      Not Applicable
  04/05/2026 03 PM PDT            9.20             66         0      Not Applicable
  04/05/2026 04 PM PDT            9.20             66         0      Not Applicable
  04/05/2026 05 PM PDT            9.20             66         0      Not Applicable
  04/05/2026 06 PM PDT            9.20             66         0      Not Applicable
  04/05/2026 07 PM PDT            9.19             65         -      Not Applicable
  04/05/2026 08 PM PDT            9.19             65         0      Not Applicable
  04/05/2026 09 PM PDT            9.19             65         0      Not Applicable
  04/05/2026 10 PM PDT            9.18             64         -      Not Applicable
  04/05/2026 11 PM PDT            9.18             64         0      Not Applicable
  04/06/2026 12 AM PDT            9.18             64         0      Not Applicable
  04/06/2026 01 AM PDT            9.18             64         0      Not Applicable
  04/06/2026 02 AM PDT            9.17             63         -      Not Applicable
  04/06/2026 03 AM PDT            9.17             63         0      Not Applicable
  04/06/2026 04 AM PDT            9.17             63         0      Not Applicable
  04/06/2026 05 AM PDT            9.17             63         0      Not Applicable
  04/06/2026 06 AM PDT            9.17             63         0      Not Applicable
  04/06/2026 07 AM PDT            9.16             61         -      Not Applicable
  04/06/2026 08 AM PDT            9.16             61         0      Not Applicable
  04/06/2026 09 AM PDT            9.16             61         0      Not Applicable
  04/06/2026 10 AM PDT            9.16             61         0      Not Applicable
  04/06/2026 11 AM PDT            9.16             61         0      Not Applicable
  04/06/2026 12 PM PDT            9.17             63         +      Not Applicable
  04/06/2026 01 PM PDT            9.17             63         0      Not Applicable
  04/06/2026 02 PM PDT            9.16             61         -      Not Applicable
  04/06/2026 03 PM PDT            9.17             63         +      Not Applicable
  04/06/2026 04 PM PDT            9.16             61         -      Not Applicable
  04/06/2026 05 PM PDT            9.16             61         0      Not Applicable
  04/06/2026 06 PM PDT            9.15             60         -      Not Applicable
  04/06/2026 07 PM PDT            9.16             61         +      Not Applicable
  04/06/2026 08 PM PDT            9.15             60         -      Not Applicable
  04/06/2026 09 PM PDT            9.15             60         0      Not Applicable
  04/06/2026 10 PM PDT            9.15             60         0      Not Applicable
  04/06/2026 11 PM PDT            9.14             59         -      Not Applicable
  04/07/2026 12 AM PDT            9.14             59         0      Not Applicable
  04/07/2026 01 AM PDT            9.14             59         0      Not Applicable
  04/07/2026 02 AM PDT            9.14             59         0      Not Applicable
  04/07/2026 03 AM PDT            9.14             59         0      Not Applicable
  04/07/2026 04 AM PDT            9.14             59         0      Not Applicable
  04/07/2026 05 AM PDT            9.13             58         -      Not Applicable
  04/07/2026 06 AM PDT            9.13             58         0      Not Applicable
  04/07/2026 07 AM PDT            9.13             58         0      Not Applicable
  04/07/2026 08 AM PDT            9.13             58         0      Not Applicable
  04/07/2026 09 AM PDT            9.13             58         0      Not Applicable
  04/07/2026 10 AM PDT            9.13             58         0      Not Applicable
  04/07/2026 11 AM PDT            9.13             58         0      Not Applicable
  04/07/2026 12 PM PDT            9.14             59         +      Not Applicable
  04/07/2026 01 PM PDT            9.13             58         -      Not Applicable
  04/07/2026 02 PM PDT            9.13             58         0      Not Applicable
  04/07/2026 03 PM PDT            9.13             58         0      Not Applicable
  04/07/2026 04 PM PDT            9.13             58         0      Not Applicable
  04/07/2026 05 PM PDT            9.13             58         0      Not Applicable
  04/07/2026 06 PM PDT            9.13             58         0      Not Applicable
  04/07/2026 07 PM PDT            9.13             58         0      Not Applicable
  04/07/2026 08 PM PDT            9.13             58         0      Not Applicable
  04/07/2026 09 PM PDT            9.13             58         0      Not Applicable
  04/07/2026 10 PM PDT            9.12             57         -      Not Applicable
  04/07/2026 11 PM PDT            9.12             57         0      Not Applicable
  04/08/2026 12 AM PDT            9.12             57         0      Not Applicable
  04/08/2026 01 AM PDT            9.12             57         0      Not Applicable
  04/08/2026 02 AM PDT            9.12             57         0      Not Applicable
  04/08/2026 03 AM PDT            9.11             56         -      Not Applicable
  04/08/2026 04 AM PDT            9.11             56         0      Not Applicable
  04/08/2026 05 AM PDT            9.11             56         0      Not Applicable
  04/08/2026 06 AM PDT            9.11             56         0      Not Applicable
  04/08/2026 07 AM PDT            9.11             56         0      Not Applicable
  04/08/2026 08 AM PDT            9.11             56         0      Not Applicable
  04/08/2026 09 AM PDT            9.10             55         -      Not Applicable
  04/08/2026 10 AM PDT            9.10             55         0      Not Applicable
  04/08/2026 11 AM PDT            9.11             56         +      Not Applicable
  04/08/2026 12 PM PDT            9.11             56         0      Not Applicable
  04/08/2026 01 PM PDT            9.11             56         0      Not Applicable
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  04/08/2026 02 PM PDT            9.11             56                Not Applicable
  04/08/2026 03 PM PDT            9.11             56         0      Not Applicable
  04/08/2026 04 PM PDT            9.11             56         0      Not Applicable
  04/08/2026 05 PM PDT            9.11             56         0      Not Applicable
  04/08/2026 06 PM PDT            9.11             56         0      Not Applicable
  04/08/2026 07 PM PDT            9.11             56         0      Not Applicable
  04/08/2026 08 PM PDT            9.12             57         +      Not Applicable
  04/08/2026 09 PM PDT            9.12             57         0      Not Applicable
  04/08/2026 10 PM PDT            9.12             57         0      Not Applicable
  04/08/2026 11 PM PDT            9.11             56         -      Not Applicable
  04/09/2026 12 AM PDT            9.11             56         0      Not Applicable
  04/09/2026 01 AM PDT            9.11             56         0      Not Applicable
  04/09/2026 02 AM PDT            9.11             56         0      Not Applicable
  04/09/2026 03 AM PDT            9.11             56         0      Not Applicable
  04/09/2026 04 AM PDT            9.11             56         0      Not Applicable
  04/09/2026 05 AM PDT            9.11             56         0      Not Applicable
  04/09/2026 06 AM PDT            9.11             56         0      Not Applicable
  04/09/2026 07 AM PDT            9.11             56         0      Not Applicable
  04/09/2026 08 AM PDT            9.11             56         0      Not Applicable
  04/09/2026 09 AM PDT            9.11             56         0      Not Applicable
  04/09/2026 10 AM PDT            9.12             57         +      Not Applicable
  04/09/2026 11 AM PDT            9.12             57         0      Not Applicable
  04/09/2026 12 PM PDT            9.13             58         +      Not Applicable
  04/09/2026 01 PM PDT            9.13             58         0      Not Applicable
  04/09/2026 02 PM PDT            9.14             59         +      Not Applicable
  04/09/2026 03 PM PDT            9.14             59         0      Not Applicable
  04/09/2026 04 PM PDT            9.15             60         +      Not Applicable
  04/09/2026 05 PM PDT            9.16             61         +      Not Applicable
  04/09/2026 06 PM PDT            9.16             61         0      Not Applicable
  04/09/2026 07 PM PDT            9.16             61         0      Not Applicable
  04/09/2026 08 PM PDT            9.17             63         +      Not Applicable
  04/09/2026 09 PM PDT            9.17             63         0      Not Applicable
  04/09/2026 10 PM PDT            9.17             63         0      Not Applicable
  04/09/2026 11 PM PDT            9.17             63         0      Not Applicable
  04/10/2026 12 AM PDT            9.16             61         -      Not Applicable
  04/10/2026 01 AM PDT            9.16             61         0      Not Applicable
  04/10/2026 02 AM PDT            9.16             61         0      Not Applicable
  04/10/2026 03 AM PDT            9.16             61         0      Not Applicable
  04/10/2026 04 AM PDT            9.15             60         -      Not Applicable
  04/10/2026 05 AM PDT            9.15             60         0      Not Applicable
  04/10/2026 06 AM PDT            9.14             59         -      Not Applicable
  04/10/2026 07 AM PDT            9.14             59         0      Not Applicable
  04/10/2026 08 AM PDT            9.13             58         -      Not Applicable
  04/10/2026 09 AM PDT            9.13             58         0      Not Applicable
  04/10/2026 10 AM PDT            9.13             58         0      Not Applicable
  04/10/2026 11 AM PDT            9.13             58         0      Not Applicable
  04/10/2026 12 PM PDT            9.13             58         0      Not Applicable
  04/10/2026 01 PM PDT            9.13             58         0      Not Applicable
  04/10/2026 02 PM PDT            9.14             59         +      Not Applicable
  04/10/2026 03 PM PDT            9.14             59         0      Not Applicable
  04/10/2026 04 PM PDT            9.14             59         0      Not Applicable
  04/10/2026 05 PM PDT            9.14             59         0      Not Applicable
  04/10/2026 06 PM PDT            9.14             59         0      Not Applicable
  04/10/2026 07 PM PDT            9.15             60         +      Not Applicable
  04/10/2026 08 PM PDT            9.15             60         0      Not Applicable
  04/10/2026 09 PM PDT            9.15             60         0      Not Applicable
  04/10/2026 10 PM PDT            9.14             59         -      Not Applicable
  04/10/2026 11 PM PDT            9.14             59         0      Not Applicable
  04/11/2026 12 AM PDT            9.14             59         0      Not Applicable
  04/11/2026 01 AM PDT            9.13             58         -      Not Applicable
  04/11/2026 02 AM PDT            9.14             59         +      Not Applicable
  04/11/2026 03 AM PDT            9.16             61         +      Not Applicable
  04/11/2026 04 AM PDT            9.21             67         +      Not Applicable
  04/11/2026 05 AM PDT            9.29             77         +      Not Applicable
  04/11/2026 06 AM PDT            9.38             89         +      Not Applicable
  04/11/2026 07 AM PDT            9.48            105         +      Not Applicable
  04/11/2026 08 AM PDT            9.58            124         +      Not Applicable
  04/11/2026 09 AM PDT            9.73            148         +      Not Applicable
  04/11/2026 10 AM PDT            9.91            178         +      Not Applicable
  04/11/2026 11 AM PDT           10.11            215         +      Not Applicable
  04/11/2026 12 PM PDT           10.32            256         +      Not Applicable
  04/11/2026 01 PM PDT           10.52            298         +      Not Applicable
  04/11/2026 02 PM PDT           10.72            343         +      Not Applicable
  04/11/2026 03 PM PDT           10.90            386         +      Not Applicable
  04/11/2026 04 PM PDT           11.08            431         +      Not Applicable
  04/11/2026 05 PM PDT           11.21            474         +      Not Applicable
  04/11/2026 06 PM PDT           11.39            538         +      Not Applicable
  04/11/2026 07 PM PDT           11.52            587         +      Not Applicable
  04/11/2026 08 PM PDT           11.62            626         +      Not Applicable
  04/11/2026 09 PM PDT           11.67            646         +      Not Applicable
  04/11/2026 10 PM PDT           11.69            654         +      Not Applicable
  04/11/2026 11 PM PDT           11.69            654         0      Not Applicable
  04/12/2026 12 AM PDT           11.67            646         -      Not Applicable
  04/12/2026 01 AM PDT           11.64            634         -      Not Applicable
  04/12/2026 02 AM PDT           11.61            622         -      Not Applicable
  04/12/2026 03 AM PDT           11.56            603         -      Not Applicable
  04/12/2026 04 AM PDT           11.51            584         -      Not Applicable
  04/12/2026 05 AM PDT           11.46            565         -      Not Applicable
  04/12/2026 06 AM PDT           11.41            546         -      Not Applicable
  04/12/2026 07 AM PDT           11.37            531         -      Not Applicable
  04/12/2026 08 AM PDT           11.32            513         -      Not Applicable
  04/12/2026 09 AM PDT           11.28            499         -      Not Applicable
  04/12/2026 10 AM PDT           11.24            484         -      Not Applicable
  04/12/2026 11 AM PDT           11.21            474         -      Not Applicable
  04/12/2026 12 PM PDT           11.18            463         -      Not Applicable
  04/12/2026 01 PM PDT           11.16            457         -      Not Applicable
  04/12/2026 02 PM PDT           11.14            450         -      Not Applicable
  04/12/2026 03 PM PDT           11.12            443         -      Not Applicable
  04/12/2026 04 PM PDT           11.09            434         -      Not Applicable
  04/12/2026 05 PM PDT           11.07            429         -      Not Applicable
  04/12/2026 06 PM PDT           11.04            421         -      Not Applicable
  04/12/2026 07 PM PDT           11.01            413         -      Not Applicable
  04/12/2026 08 PM PDT           10.99            408         -      Not Applicable
  04/12/2026 09 PM PDT           10.96            401         -      Not Applicable
  04/12/2026 10 PM PDT           10.93            393         -      Not Applicable
  04/12/2026 11 PM PDT           10.90            386         -      Not Applicable
  04/13/2026 12 AM PDT           10.87            379         -      Not Applicable
  04/13/2026 01 AM PDT           10.84            372         -      Not Applicable
  04/13/2026 02 AM PDT           10.81            364         -      Not Applicable
  04/13/2026 03 AM PDT           10.78            357         -      Not Applicable
  04/13/2026 04 AM PDT           10.75            350         -      Not Applicable
  04/13/2026 05 AM PDT           10.72            343         -      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.