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 03 2026 at 12:53 PM PDTNext Issuance: Apr 04 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:  04/03/2026 at 12:55 PM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  04/01/2026 at 07:00 PM PDT
# Maximum Observed Stage:                       11.15 Feet
# Maximum Observed Flow:                        453 cfs
#
# Earliest Date & Time of Maximum Forecast:     04/03/2026 at 01:00 PM PDT
# Maximum Forecast Stage:                       9.34 Feet
# Maximum Forecast Flow:                        83 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  03/29/2026 12 PM PDT            9.15             60                Not Applicable
  03/29/2026 01 PM PDT            9.15             60         0      Not Applicable
  03/29/2026 02 PM PDT            9.15             60         0      Not Applicable
  03/29/2026 03 PM PDT            9.15             60         0      Not Applicable
  03/29/2026 04 PM PDT            9.15             60         0      Not Applicable
  03/29/2026 05 PM PDT            9.15             60         0      Not Applicable
  03/29/2026 06 PM PDT            9.15             60         0      Not Applicable
  03/29/2026 07 PM PDT            9.14             59         -      Not Applicable
  03/29/2026 08 PM PDT            9.14             59         0      Not Applicable
  03/29/2026 09 PM PDT            9.14             59         0      Not Applicable
  03/29/2026 10 PM PDT            9.13             58         -      Not Applicable
  03/29/2026 11 PM PDT            9.13             58         0      Not Applicable
  03/30/2026 12 AM PDT            9.13             58         0      Not Applicable
  03/30/2026 01 AM PDT            9.13             58         0      Not Applicable
  03/30/2026 02 AM PDT            9.13             58         0      Not Applicable
  03/30/2026 03 AM PDT            9.13             58         0      Not Applicable
  03/30/2026 04 AM PDT            9.13             58         0      Not Applicable
  03/30/2026 05 AM PDT            9.12             57         -      Not Applicable
  03/30/2026 06 AM PDT            9.13             58         +      Not Applicable
  03/30/2026 07 AM PDT            9.12             57         -      Not Applicable
  03/30/2026 08 AM PDT            9.12             57         0      Not Applicable
  03/30/2026 09 AM PDT            9.13             58         +      Not Applicable
  03/30/2026 10 AM PDT            9.12             57         -      Not Applicable
  03/30/2026 11 AM PDT            9.13             58         +      Not Applicable
  03/30/2026 12 PM PDT            9.13             58         0      Not Applicable
  03/30/2026 01 PM PDT            9.13             58         0      Not Applicable
  03/30/2026 02 PM PDT            9.13             58         0      Not Applicable
  03/30/2026 03 PM PDT            9.13             58         0      Not Applicable
  03/30/2026 04 PM PDT            9.13             58         0      Not Applicable
  03/30/2026 05 PM PDT            9.13             58         0      Not Applicable
  03/30/2026 06 PM PDT            9.13             58         0      Not Applicable
  03/30/2026 07 PM PDT            9.13             58         0      Not Applicable
  03/30/2026 08 PM PDT            9.13             58         0      Not Applicable
  03/30/2026 09 PM PDT            9.12             57         -      Not Applicable
  03/30/2026 10 PM PDT            9.13             58         +      Not Applicable
  03/30/2026 11 PM PDT            9.12             57         -      Not Applicable
  03/31/2026 12 AM PDT            9.12             57         0      Not Applicable
  03/31/2026 01 AM PDT            9.12             57         0      Not Applicable
  03/31/2026 02 AM PDT            9.12             57         0      Not Applicable
  03/31/2026 03 AM PDT            9.12             57         0      Not Applicable
  03/31/2026 04 AM PDT            9.12             57         0      Not Applicable
  03/31/2026 05 AM PDT            9.12             57         0      Not Applicable
  03/31/2026 06 AM PDT            9.12             57         0      Not Applicable
  03/31/2026 07 AM PDT            9.11             56         -      Not Applicable
  03/31/2026 08 AM PDT            9.11             56         0      Not Applicable
  03/31/2026 09 AM PDT            9.12             57         +      Not Applicable
  03/31/2026 10 AM PDT            9.12             57         0      Not Applicable
  03/31/2026 11 AM PDT            9.13             58         +      Not Applicable
  03/31/2026 12 PM PDT            9.13             58         0      Not Applicable
  03/31/2026 01 PM PDT            9.13             58         0      Not Applicable
  03/31/2026 02 PM PDT            9.13             58         0      Not Applicable
  03/31/2026 03 PM PDT            9.13             58         0      Not Applicable
  03/31/2026 04 PM PDT            9.13             58         0      Not Applicable
  03/31/2026 05 PM PDT            9.13             58         0      Not Applicable
  03/31/2026 06 PM PDT            9.13             58         0      Not Applicable
  03/31/2026 07 PM PDT            9.13             58         0      Not Applicable
  03/31/2026 08 PM PDT            9.12             57         -      Not Applicable
  03/31/2026 09 PM PDT            9.12             57         0      Not Applicable
  03/31/2026 10 PM PDT            9.12             57         0      Not Applicable
  03/31/2026 11 PM PDT            9.12             57         0      Not Applicable
  04/01/2026 12 AM PDT            9.12             57         0      Not Applicable
  04/01/2026 01 AM PDT            9.12             57         0      Not Applicable
  04/01/2026 02 AM PDT            9.12             57         0      Not Applicable
  04/01/2026 03 AM PDT            9.12             57         0      Not Applicable
  04/01/2026 04 AM PDT            9.12             57         0      Not Applicable
  04/01/2026 05 AM PDT            9.13             58         +      Not Applicable
  04/01/2026 06 AM PDT            9.13             58         0      Not Applicable
  04/01/2026 07 AM PDT            9.13             58         0      Not Applicable
  04/01/2026 08 AM PDT            9.14             59         +      Not Applicable
  04/01/2026 09 AM PDT            9.14             59         0      Not Applicable
  04/01/2026 10 AM PDT            9.16             61         +      Not Applicable
  04/01/2026 11 AM PDT            9.16             61         0      Not Applicable
  04/01/2026 12 PM PDT            9.19             65         +      Not Applicable
  04/01/2026 01 PM PDT            9.24             70         +      Not Applicable
  04/01/2026 02 PM PDT            9.30             78         +      Not Applicable
  04/01/2026 03 PM PDT            9.40             92         +      Not Applicable
  04/01/2026 04 PM PDT            9.52            113         +      Not Applicable
  04/01/2026 05 PM PDT            9.76            153         +      Not Applicable
  04/01/2026 06 PM PDT           10.36            264         +      Not Applicable
  04/01/2026 07 PM PDT           11.15            453         +      Not Applicable
  04/01/2026 08 PM PDT           11.11            440         -      Not Applicable
  04/01/2026 09 PM PDT           10.88            381         -      Not Applicable
  04/01/2026 10 PM PDT           10.70            339         -      Not Applicable
  04/01/2026 11 PM PDT           10.54            303         -      Not Applicable
  04/02/2026 12 AM PDT           10.41            275         -      Not Applicable
  04/02/2026 01 AM PDT           10.29            250         -      Not Applicable
  04/02/2026 02 AM PDT           10.21            234         -      Not Applicable
  04/02/2026 03 AM PDT           10.13            218         -      Not Applicable
  04/02/2026 04 AM PDT           10.06            205         -      Not Applicable
  04/02/2026 05 AM PDT            9.99            193         -      Not Applicable
  04/02/2026 06 AM PDT            9.94            184         -      Not Applicable
  04/02/2026 07 AM PDT            9.87            171         -      Not Applicable
  04/02/2026 08 AM PDT            9.84            166         -      Not Applicable
  04/02/2026 09 AM PDT            9.78            156         -      Not Applicable
  04/02/2026 10 AM PDT            9.74            150         -      Not Applicable
  04/02/2026 11 AM PDT            9.70            143         -      Not Applicable
  04/02/2026 12 PM PDT            9.66            137         -      Not Applicable
  04/02/2026 01 PM PDT            9.64            134         -      Not Applicable
  04/02/2026 02 PM PDT            9.60            128         -      Not Applicable
  04/02/2026 03 PM PDT            9.58            124         -      Not Applicable
  04/02/2026 04 PM PDT            9.56            120         -      Not Applicable
  04/02/2026 05 PM PDT            9.54            116         -      Not Applicable
  04/02/2026 06 PM PDT            9.53            114         -      Not Applicable
  04/02/2026 07 PM PDT            9.52            113         -      Not Applicable
  04/02/2026 08 PM PDT            9.50            109         -      Not Applicable
  04/02/2026 09 PM PDT            9.48            105         -      Not Applicable
  04/02/2026 10 PM PDT            9.47            104         -      Not Applicable
  04/02/2026 11 PM PDT            9.45            100         -      Not Applicable
  04/03/2026 12 AM PDT            9.44             98         -      Not Applicable
  04/03/2026 01 AM PDT            9.43             97         -      Not Applicable
  04/03/2026 02 AM PDT            9.42             95         -      Not Applicable
  04/03/2026 03 AM PDT            9.41             94         -      Not Applicable
  04/03/2026 04 AM PDT            9.40             92         -      Not Applicable
  04/03/2026 05 AM PDT            9.39             91         -      Not Applicable
  04/03/2026 06 AM PDT            9.38             89         -      Not Applicable
  04/03/2026 07 AM PDT            9.37             88         -      Not Applicable
  04/03/2026 08 AM PDT            9.38             89         +      Not Applicable
  04/03/2026 09 AM PDT            9.37             88         -      Not Applicable
  04/03/2026 10 AM PDT            9.36             86         -      Not Applicable
  04/03/2026 11 AM PDT            9.35             85         -      Not Applicable
  04/03/2026 12 PM PDT            9.35             85         0      Not Applicable
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  04/03/2026 01 PM PDT            9.34             83                Not Applicable
  04/03/2026 02 PM PDT            9.34             83         0      Not Applicable
  04/03/2026 03 PM PDT            9.33             82         -      Not Applicable
  04/03/2026 04 PM PDT            9.33             82         0      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            9.32             80         0      Not Applicable
  04/03/2026 09 PM PDT            9.32             80         0      Not Applicable
  04/03/2026 10 PM PDT            9.32             80         0      Not Applicable
  04/03/2026 11 PM PDT            9.32             80         0      Not Applicable
  04/04/2026 12 AM PDT            9.32             80         0      Not Applicable
  04/04/2026 01 AM PDT            9.31             79         -      Not Applicable
  04/04/2026 02 AM PDT            9.31             79         0      Not Applicable
  04/04/2026 03 AM PDT            9.31             79         0      Not Applicable
  04/04/2026 04 AM PDT            9.31             79         0      Not Applicable
  04/04/2026 05 AM PDT            9.31             79         0      Not Applicable
  04/04/2026 06 AM PDT            9.31             79         0      Not Applicable
  04/04/2026 07 AM PDT            9.31             79         0      Not Applicable
  04/04/2026 08 AM PDT            9.31             79         0      Not Applicable
  04/04/2026 09 AM PDT            9.30             78         -      Not Applicable
  04/04/2026 10 AM PDT            9.30             78         0      Not Applicable
  04/04/2026 11 AM PDT            9.30             78         0      Not Applicable
  04/04/2026 12 PM PDT            9.30             78         0      Not Applicable
  04/04/2026 01 PM PDT            9.30             78         0      Not Applicable
  04/04/2026 02 PM PDT            9.30             78         0      Not Applicable
  04/04/2026 03 PM PDT            9.30             78         0      Not Applicable
  04/04/2026 04 PM PDT            9.30             78         0      Not Applicable
  04/04/2026 05 PM PDT            9.30             78         0      Not Applicable
  04/04/2026 06 PM PDT            9.30             78         0      Not Applicable
  04/04/2026 07 PM PDT            9.30             78         0      Not Applicable
  04/04/2026 08 PM PDT            9.29             77         -      Not Applicable
  04/04/2026 09 PM PDT            9.29             77         0      Not Applicable
  04/04/2026 10 PM PDT            9.29             77         0      Not Applicable
  04/04/2026 11 PM PDT            9.29             77         0      Not Applicable
  04/05/2026 12 AM PDT            9.29             77         0      Not Applicable
  04/05/2026 01 AM PDT            9.29             77         0      Not Applicable
  04/05/2026 02 AM PDT            9.29             77         0      Not Applicable
  04/05/2026 03 AM PDT            9.29             77         0      Not Applicable
  04/05/2026 04 AM PDT            9.29             77         0      Not Applicable
  04/05/2026 05 AM PDT            9.29             77         0      Not Applicable
  04/05/2026 06 AM PDT            9.29             77         0      Not Applicable
  04/05/2026 07 AM PDT            9.29             77         0      Not Applicable
  04/05/2026 08 AM PDT            9.28             75         -      Not Applicable
  04/05/2026 09 AM PDT            9.28             75         0      Not Applicable
  04/05/2026 10 AM PDT            9.28             75         0      Not Applicable
  04/05/2026 11 AM PDT            9.28             75         0      Not Applicable
  04/05/2026 12 PM PDT            9.28             75         0      Not Applicable
  04/05/2026 01 PM PDT            9.28             75         0      Not Applicable
  04/05/2026 02 PM PDT            9.28             75         0      Not Applicable
  04/05/2026 03 PM PDT            9.28             75         0      Not Applicable
  04/05/2026 04 PM PDT            9.28             75         0      Not Applicable
  04/05/2026 05 PM PDT            9.28             75         0      Not Applicable
  04/05/2026 06 PM PDT            9.28             75         0      Not Applicable
  04/05/2026 07 PM PDT            9.28             75         0      Not Applicable
  04/05/2026 08 PM PDT            9.27             74         -      Not Applicable
  04/05/2026 09 PM PDT            9.27             74         0      Not Applicable
  04/05/2026 10 PM PDT            9.27             74         0      Not Applicable
  04/05/2026 11 PM PDT            9.27             74         0      Not Applicable
  04/06/2026 12 AM PDT            9.27             74         0      Not Applicable
  04/06/2026 01 AM PDT            9.27             74         0      Not Applicable
  04/06/2026 02 AM PDT            9.27             74         0      Not Applicable
  04/06/2026 03 AM PDT            9.27             74         0      Not Applicable
  04/06/2026 04 AM PDT            9.27             74         0      Not Applicable
  04/06/2026 05 AM PDT            9.27             74         0      Not Applicable
  04/06/2026 06 AM PDT            9.27             74         0      Not Applicable
  04/06/2026 07 AM PDT            9.27             74         0      Not Applicable
  04/06/2026 08 AM PDT            9.27             74         0      Not Applicable
  04/06/2026 09 AM PDT            9.26             73         -      Not Applicable
  04/06/2026 10 AM PDT            9.26             73         0      Not Applicable
  04/06/2026 11 AM PDT            9.26             73         0      Not Applicable
  04/06/2026 12 PM PDT            9.26             73         0      Not Applicable
  04/06/2026 01 PM PDT            9.26             73         0      Not Applicable
  04/06/2026 02 PM PDT            9.26             73         0      Not Applicable
  04/06/2026 03 PM PDT            9.26             73         0      Not Applicable
  04/06/2026 04 PM PDT            9.26             73         0      Not Applicable
  04/06/2026 05 PM PDT            9.26             73         0      Not Applicable
  04/06/2026 06 PM PDT            9.26             73         0      Not Applicable
  04/06/2026 07 PM PDT            9.26             73         0      Not Applicable
  04/06/2026 08 PM PDT            9.26             73         0      Not Applicable
  04/06/2026 09 PM PDT            9.26             73         0      Not Applicable
  04/06/2026 10 PM PDT            9.26             73         0      Not Applicable
  04/06/2026 11 PM PDT            9.26             73         0      Not Applicable
  04/07/2026 12 AM PDT            9.25             71         -      Not Applicable
  04/07/2026 01 AM PDT            9.25             71         0      Not Applicable
  04/07/2026 02 AM PDT            9.25             71         0      Not Applicable
  04/07/2026 03 AM PDT            9.25             71         0      Not Applicable
  04/07/2026 04 AM PDT            9.25             71         0      Not Applicable
  04/07/2026 05 AM PDT            9.25             71         0      Not Applicable
  04/07/2026 06 AM PDT            9.25             71         0      Not Applicable
  04/07/2026 07 AM PDT            9.25             71         0      Not Applicable
  04/07/2026 08 AM PDT            9.25             71         0      Not Applicable
  04/07/2026 09 AM PDT            9.25             71         0      Not Applicable
  04/07/2026 10 AM PDT            9.25             71         0      Not Applicable
  04/07/2026 11 AM PDT            9.25             71         0      Not Applicable
  04/07/2026 12 PM PDT            9.25             71         0      Not Applicable
  04/07/2026 01 PM PDT            9.25             71         0      Not Applicable
  04/07/2026 02 PM PDT            9.24             70         -      Not Applicable
  04/07/2026 03 PM PDT            9.24             70         0      Not Applicable
  04/07/2026 04 PM PDT            9.24             70         0      Not Applicable
  04/07/2026 05 PM PDT            9.24             70         0      Not Applicable
  04/07/2026 06 PM PDT            9.25             71         +      Not Applicable
  04/07/2026 07 PM PDT            9.25             71         0      Not Applicable
  04/07/2026 08 PM PDT            9.25             71         0      Not Applicable
  04/07/2026 09 PM PDT            9.25             71         0      Not Applicable
  04/07/2026 10 PM PDT            9.25             71         0      Not Applicable
  04/07/2026 11 PM PDT            9.25             71         0      Not Applicable
  04/08/2026 12 AM PDT            9.25             71         0      Not Applicable
  04/08/2026 01 AM PDT            9.25             71         0      Not Applicable
  04/08/2026 02 AM PDT            9.26             73         +      Not Applicable
  04/08/2026 03 AM PDT            9.26             73         0      Not Applicable
  04/08/2026 04 AM PDT            9.26             73         0      Not Applicable
  04/08/2026 05 AM PDT            9.26             73         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.