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 09 2026 at 12:57 PM PDTNext Issuance: Apr 10 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:  04/09/2026 at 01:01 PM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  04/04/2026 at 02:00 PM PDT
# Maximum Observed Stage:                       9.26 Feet
# Maximum Observed Flow:                        73 cfs
#
# Earliest Date & Time of Maximum Forecast:     04/11/2026 at 10:00 PM PDT
# Maximum Forecast Stage:                       11.97 Feet
# Maximum Forecast Flow:                        771 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  04/04/2026 01 PM PDT            9.26             73                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
  04/08/2026 02 PM PDT            9.11             56         0      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            9.11             56         0      Not Applicable
  04/08/2026 09 PM PDT            9.11             56         0      Not Applicable
  04/08/2026 10 PM PDT            9.11             56         0      Not Applicable
  04/08/2026 11 PM PDT            9.11             56         0      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            9.11             56         0      Not Applicable
  04/09/2026 11 AM PDT            9.11             56         0      Not Applicable
  04/09/2026 12 PM PDT            9.11             56         0      Not Applicable
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  04/09/2026 01 PM PDT            9.11             56                Not Applicable
  04/09/2026 02 PM PDT            9.11             56         0      Not Applicable
  04/09/2026 03 PM PDT            9.11             56         0      Not Applicable
  04/09/2026 04 PM PDT            9.11             56         0      Not Applicable
  04/09/2026 05 PM PDT            9.12             57         +      Not Applicable
  04/09/2026 06 PM PDT            9.12             57         0      Not Applicable
  04/09/2026 07 PM PDT            9.13             58         +      Not Applicable
  04/09/2026 08 PM PDT            9.14             59         +      Not Applicable
  04/09/2026 09 PM PDT            9.14             59         0      Not Applicable
  04/09/2026 10 PM PDT            9.14             59         0      Not Applicable
  04/09/2026 11 PM PDT            9.14             59         0      Not Applicable
  04/10/2026 12 AM PDT            9.14             59         0      Not Applicable
  04/10/2026 01 AM PDT            9.14             59         0      Not Applicable
  04/10/2026 02 AM PDT            9.13             58         -      Not Applicable
  04/10/2026 03 AM PDT            9.13             58         0      Not Applicable
  04/10/2026 04 AM PDT            9.13             58         0      Not Applicable
  04/10/2026 05 AM PDT            9.13             58         0      Not Applicable
  04/10/2026 06 AM PDT            9.13             58         0      Not Applicable
  04/10/2026 07 AM PDT            9.12             57         -      Not Applicable
  04/10/2026 08 AM PDT            9.12             57         0      Not Applicable
  04/10/2026 09 AM PDT            9.12             57         0      Not Applicable
  04/10/2026 10 AM PDT            9.12             57         0      Not Applicable
  04/10/2026 11 AM PDT            9.13             58         +      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            9.13             58         0      Not Applicable
  04/10/2026 03 PM PDT            9.13             58         0      Not Applicable
  04/10/2026 04 PM PDT            9.14             59         +      Not Applicable
  04/10/2026 05 PM PDT            9.14             59         0      Not Applicable
  04/10/2026 06 PM PDT            9.15             60         +      Not Applicable
  04/10/2026 07 PM PDT            9.15             60         0      Not Applicable
  04/10/2026 08 PM PDT            9.16             61         +      Not Applicable
  04/10/2026 09 PM PDT            9.16             61         0      Not Applicable
  04/10/2026 10 PM PDT            9.16             61         0      Not Applicable
  04/10/2026 11 PM PDT            9.16             61         0      Not Applicable
  04/11/2026 12 AM PDT            9.17             63         +      Not Applicable
  04/11/2026 01 AM PDT            9.17             63         0      Not Applicable
  04/11/2026 02 AM PDT            9.17             63         0      Not Applicable
  04/11/2026 03 AM PDT            9.17             63         0      Not Applicable
  04/11/2026 04 AM PDT            9.18             64         +      Not Applicable
  04/11/2026 05 AM PDT            9.18             64         0      Not Applicable
  04/11/2026 06 AM PDT            9.19             65         +      Not Applicable
  04/11/2026 07 AM PDT            9.22             68         +      Not Applicable
  04/11/2026 08 AM PDT            9.28             75         +      Not Applicable
  04/11/2026 09 AM PDT            9.38             89         +      Not Applicable
  04/11/2026 10 AM PDT            9.54            116         +      Not Applicable
  04/11/2026 11 AM PDT            9.75            151         +      Not Applicable
  04/11/2026 12 PM PDT           10.01            196         +      Not Applicable
  04/11/2026 01 PM PDT           10.27            246         +      Not Applicable
  04/11/2026 02 PM PDT           10.52            298         +      Not Applicable
  04/11/2026 03 PM PDT           10.78            357         +      Not Applicable
  04/11/2026 04 PM PDT           11.05            423         +      Not Applicable
  04/11/2026 05 PM PDT           11.29            502         +      Not Applicable
  04/11/2026 06 PM PDT           11.56            603         +      Not Applicable
  04/11/2026 07 PM PDT           11.77            687         +      Not Applicable
  04/11/2026 08 PM PDT           11.90            741         +      Not Applicable
  04/11/2026 09 PM PDT           11.96            766         +      Not Applicable
  04/11/2026 10 PM PDT           11.97            771         +      Not Applicable
  04/11/2026 11 PM PDT           11.96            766         -      Not Applicable
  04/12/2026 12 AM PDT           11.92            749         -      Not Applicable
  04/12/2026 01 AM PDT           11.86            724         -      Not Applicable
  04/12/2026 02 AM PDT           11.80            699         -      Not Applicable
  04/12/2026 03 AM PDT           11.73            670         -      Not Applicable
  04/12/2026 04 AM PDT           11.66            642         -      Not Applicable
  04/12/2026 05 AM PDT           11.60            618         -      Not Applicable
  04/12/2026 06 AM PDT           11.55            599         -      Not Applicable
  04/12/2026 07 AM PDT           11.50            580         -      Not Applicable
  04/12/2026 08 AM PDT           11.46            565         -      Not Applicable
  04/12/2026 09 AM PDT           11.42            550         -      Not Applicable
  04/12/2026 10 AM PDT           11.38            535         -      Not Applicable
  04/12/2026 11 AM PDT           11.35            524         -      Not Applicable
  04/12/2026 12 PM PDT           11.33            517         -      Not Applicable
  04/12/2026 01 PM PDT           11.30            506         -      Not Applicable
  04/12/2026 02 PM PDT           11.28            499         -      Not Applicable
  04/12/2026 03 PM PDT           11.26            491         -      Not Applicable
  04/12/2026 04 PM PDT           11.23            481         -      Not Applicable
  04/12/2026 05 PM PDT           11.21            474         -      Not Applicable
  04/12/2026 06 PM PDT           11.19            467         -      Not Applicable
  04/12/2026 07 PM PDT           11.17            460         -      Not Applicable
  04/12/2026 08 PM PDT           11.15            453         -      Not Applicable
  04/12/2026 09 PM PDT           11.13            446         -      Not Applicable
  04/12/2026 10 PM PDT           11.10            436         -      Not Applicable
  04/12/2026 11 PM PDT           11.07            429         -      Not Applicable
  04/13/2026 12 AM PDT           11.04            421         -      Not Applicable
  04/13/2026 01 AM PDT           11.01            413         -      Not Applicable
  04/13/2026 02 AM PDT           10.98            406         -      Not Applicable
  04/13/2026 03 AM PDT           10.95            398         -      Not Applicable
  04/13/2026 04 AM PDT           10.92            391         -      Not Applicable
  04/13/2026 05 AM PDT           10.88            381         -      Not Applicable
  04/13/2026 06 AM PDT           10.85            374         -      Not Applicable
  04/13/2026 07 AM PDT           10.82            367         -      Not Applicable
  04/13/2026 08 AM PDT           10.79            360         -      Not Applicable
  04/13/2026 09 AM PDT           10.77            355         -      Not Applicable
  04/13/2026 10 AM PDT           10.74            348         -      Not Applicable
  04/13/2026 11 AM PDT           10.72            343         -      Not Applicable
  04/13/2026 12 PM PDT           10.70            339         -      Not Applicable
  04/13/2026 01 PM PDT           10.67            332         -      Not Applicable
  04/13/2026 02 PM PDT           10.65            327         -      Not Applicable
  04/13/2026 03 PM PDT           10.63            323         -      Not Applicable
  04/13/2026 04 PM PDT           10.62            320         -      Not Applicable
  04/13/2026 05 PM PDT           10.60            316         -      Not Applicable
  04/13/2026 06 PM PDT           10.59            314         -      Not Applicable
  04/13/2026 07 PM PDT           10.57            309         -      Not Applicable
  04/13/2026 08 PM PDT           10.56            307         -      Not Applicable
  04/13/2026 09 PM PDT           10.54            303         -      Not Applicable
  04/13/2026 10 PM PDT           10.53            300         -      Not Applicable
  04/13/2026 11 PM PDT           10.52            298         -      Not Applicable
  04/14/2026 12 AM PDT           10.51            296         -      Not Applicable
  04/14/2026 01 AM PDT           10.50            294         -      Not Applicable
  04/14/2026 02 AM PDT           10.48            290         -      Not Applicable
  04/14/2026 03 AM PDT           10.47            287         -      Not Applicable
  04/14/2026 04 AM PDT           10.46            285         -      Not Applicable
  04/14/2026 05 AM PDT           10.45            283         -      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.