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 10 2026 at 1:07 PM PDTNext Issuance: Apr 11 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:  04/10/2026 at 01:09 PM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  04/05/2026 at 01:00 PM PDT
# Maximum Observed Stage:                       9.21 Feet
# Maximum Observed Flow:                        67 cfs
#
# Earliest Date & Time of Maximum Forecast:     04/12/2026 at 05:00 AM PDT
# Maximum Forecast Stage:                       11.01 Feet
# Maximum Forecast Flow:                        413 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  04/05/2026 01 PM PDT            9.21             67                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
  04/09/2026 01 PM PDT            9.11             56         0      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            9.11             56         0      Not Applicable
  04/09/2026 06 PM PDT            9.11             56         0      Not Applicable
  04/09/2026 07 PM PDT            9.11             56         0      Not Applicable
  04/09/2026 08 PM PDT            9.11             56         0      Not Applicable
  04/09/2026 09 PM PDT            9.11             56         0      Not Applicable
  04/09/2026 10 PM PDT            9.11             56         0      Not Applicable
  04/09/2026 11 PM PDT            9.11             56         0      Not Applicable
  04/10/2026 12 AM PDT            9.11             56         0      Not Applicable
  04/10/2026 01 AM PDT            9.11             56         0      Not Applicable
  04/10/2026 02 AM PDT            9.11             56         0      Not Applicable
  04/10/2026 03 AM PDT            9.11             56         0      Not Applicable
  04/10/2026 04 AM PDT            9.11             56         0      Not Applicable
  04/10/2026 05 AM PDT            9.11             56         0      Not Applicable
  04/10/2026 06 AM PDT            9.11             56         0      Not Applicable
  04/10/2026 07 AM PDT            9.11             56         0      Not Applicable
  04/10/2026 08 AM PDT            9.11             56         0      Not Applicable
  04/10/2026 09 AM PDT            9.11             56         0      Not Applicable
  04/10/2026 10 AM PDT            9.11             56         0      Not Applicable
  04/10/2026 11 AM PDT            9.12             57         +      Not Applicable
  04/10/2026 12 PM PDT            9.12             57         0      Not Applicable
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  04/10/2026 01 PM PDT            9.12             57                Not Applicable
  04/10/2026 02 PM PDT            9.12             57         0      Not Applicable
  04/10/2026 03 PM PDT            9.12             57         0      Not Applicable
  04/10/2026 04 PM PDT            9.13             58         +      Not Applicable
  04/10/2026 05 PM PDT            9.13             58         0      Not Applicable
  04/10/2026 06 PM PDT            9.13             58         0      Not Applicable
  04/10/2026 07 PM PDT            9.13             58         0      Not Applicable
  04/10/2026 08 PM PDT            9.13             58         0      Not Applicable
  04/10/2026 09 PM PDT            9.13             58         0      Not Applicable
  04/10/2026 10 PM PDT            9.13             58         0      Not Applicable
  04/10/2026 11 PM PDT            9.13             58         0      Not Applicable
  04/11/2026 12 AM PDT            9.13             58         0      Not Applicable
  04/11/2026 01 AM PDT            9.13             58         0      Not Applicable
  04/11/2026 02 AM PDT            9.14             59         +      Not Applicable
  04/11/2026 03 AM PDT            9.14             59         0      Not Applicable
  04/11/2026 04 AM PDT            9.14             59         0      Not Applicable
  04/11/2026 05 AM PDT            9.15             60         +      Not Applicable
  04/11/2026 06 AM PDT            9.16             61         +      Not Applicable
  04/11/2026 07 AM PDT            9.16             61         0      Not Applicable
  04/11/2026 08 AM PDT            9.17             63         +      Not Applicable
  04/11/2026 09 AM PDT            9.18             64         +      Not Applicable
  04/11/2026 10 AM PDT            9.19             65         +      Not Applicable
  04/11/2026 11 AM PDT            9.21             67         +      Not Applicable
  04/11/2026 12 PM PDT            9.23             69         +      Not Applicable
  04/11/2026 01 PM PDT            9.27             74         +      Not Applicable
  04/11/2026 02 PM PDT            9.34             83         +      Not Applicable
  04/11/2026 03 PM PDT            9.45            100         +      Not Applicable
  04/11/2026 04 PM PDT            9.57            122         +      Not Applicable
  04/11/2026 05 PM PDT            9.74            150         +      Not Applicable
  04/11/2026 06 PM PDT            9.91            178         +      Not Applicable
  04/11/2026 07 PM PDT           10.09            211         +      Not Applicable
  04/11/2026 08 PM PDT           10.26            244         +      Not Applicable
  04/11/2026 09 PM PDT           10.41            275         +      Not Applicable
  04/11/2026 10 PM PDT           10.54            303         +      Not Applicable
  04/11/2026 11 PM PDT           10.66            329         +      Not Applicable
  04/12/2026 12 AM PDT           10.77            355         +      Not Applicable
  04/12/2026 01 AM PDT           10.86            376         +      Not Applicable
  04/12/2026 02 AM PDT           10.93            393         +      Not Applicable
  04/12/2026 03 AM PDT           10.98            406         +      Not Applicable
  04/12/2026 04 AM PDT           11.00            411         +      Not Applicable
  04/12/2026 05 AM PDT           11.01            413         +      Not Applicable
  04/12/2026 06 AM PDT           11.01            413         0      Not Applicable
  04/12/2026 07 AM PDT           11.00            411         -      Not Applicable
  04/12/2026 08 AM PDT           10.98            406         -      Not Applicable
  04/12/2026 09 AM PDT           10.96            401         -      Not Applicable
  04/12/2026 10 AM PDT           10.93            393         -      Not Applicable
  04/12/2026 11 AM PDT           10.90            386         -      Not Applicable
  04/12/2026 12 PM PDT           10.88            381         -      Not Applicable
  04/12/2026 01 PM PDT           10.85            374         -      Not Applicable
  04/12/2026 02 PM PDT           10.81            364         -      Not Applicable
  04/12/2026 03 PM PDT           10.79            360         -      Not Applicable
  04/12/2026 04 PM PDT           10.75            350         -      Not Applicable
  04/12/2026 05 PM PDT           10.72            343         -      Not Applicable
  04/12/2026 06 PM PDT           10.69            336         -      Not Applicable
  04/12/2026 07 PM PDT           10.66            329         -      Not Applicable
  04/12/2026 08 PM PDT           10.63            323         -      Not Applicable
  04/12/2026 09 PM PDT           10.60            316         -      Not Applicable
  04/12/2026 10 PM PDT           10.56            307         -      Not Applicable
  04/12/2026 11 PM PDT           10.53            300         -      Not Applicable
  04/13/2026 12 AM PDT           10.49            292         -      Not Applicable
  04/13/2026 01 AM PDT           10.45            283         -      Not Applicable
  04/13/2026 02 AM PDT           10.41            275         -      Not Applicable
  04/13/2026 03 AM PDT           10.38            268         -      Not Applicable
  04/13/2026 04 AM PDT           10.34            260         -      Not Applicable
  04/13/2026 05 AM PDT           10.31            254         -      Not Applicable
  04/13/2026 06 AM PDT           10.28            248         -      Not Applicable
  04/13/2026 07 AM PDT           10.25            242         -      Not Applicable
  04/13/2026 08 AM PDT           10.22            236         -      Not Applicable
  04/13/2026 09 AM PDT           10.20            232         -      Not Applicable
  04/13/2026 10 AM PDT           10.18            228         -      Not Applicable
  04/13/2026 11 AM PDT           10.16            224         -      Not Applicable
  04/13/2026 12 PM PDT           10.14            220         -      Not Applicable
  04/13/2026 01 PM PDT           10.13            218         -      Not Applicable
  04/13/2026 02 PM PDT           10.11            215         -      Not Applicable
  04/13/2026 03 PM PDT           10.10            213         -      Not Applicable
  04/13/2026 04 PM PDT           10.08            209         -      Not Applicable
  04/13/2026 05 PM PDT           10.07            207         -      Not Applicable
  04/13/2026 06 PM PDT           10.06            205         -      Not Applicable
  04/13/2026 07 PM PDT           10.05            203         -      Not Applicable
  04/13/2026 08 PM PDT           10.04            202         -      Not Applicable
  04/13/2026 09 PM PDT           10.03            200         -      Not Applicable
  04/13/2026 10 PM PDT           10.02            198         -      Not Applicable
  04/13/2026 11 PM PDT           10.02            198         0      Not Applicable
  04/14/2026 12 AM PDT           10.01            196         -      Not Applicable
  04/14/2026 01 AM PDT           10.00            194         -      Not Applicable
  04/14/2026 02 AM PDT            9.99            193         -      Not Applicable
  04/14/2026 03 AM PDT            9.98            191         -      Not Applicable
  04/14/2026 04 AM PDT            9.98            191         0      Not Applicable
  04/14/2026 05 AM PDT            9.97            189         -      Not Applicable
  04/14/2026 06 AM PDT            9.96            187         -      Not Applicable
  04/14/2026 07 AM PDT            9.96            187         0      Not Applicable
  04/14/2026 08 AM PDT            9.95            185         -      Not Applicable
  04/14/2026 09 AM PDT            9.94            184         -      Not Applicable
  04/14/2026 10 AM PDT            9.93            182         -      Not Applicable
  04/14/2026 11 AM PDT            9.93            182         0      Not Applicable
  04/14/2026 12 PM PDT            9.92            180         -      Not Applicable
  04/14/2026 01 PM PDT            9.91            178         -      Not Applicable
  04/14/2026 02 PM PDT            9.91            178         0      Not Applicable
  04/14/2026 03 PM PDT            9.90            177         -      Not Applicable
  04/14/2026 04 PM PDT            9.89            175         -      Not Applicable
  04/14/2026 05 PM PDT            9.89            175         0      Not Applicable
  04/14/2026 06 PM PDT            9.88            173         -      Not Applicable
  04/14/2026 07 PM PDT            9.88            173         0      Not Applicable
  04/14/2026 08 PM PDT            9.87            171         -      Not Applicable
  04/14/2026 09 PM PDT            9.86            170         -      Not Applicable
  04/14/2026 10 PM PDT            9.86            170         0      Not Applicable
  04/14/2026 11 PM PDT            9.85            168         -      Not Applicable
  04/15/2026 12 AM PDT            9.85            168         0      Not Applicable
  04/15/2026 01 AM PDT            9.84            166         -      Not Applicable
  04/15/2026 02 AM PDT            9.83            165         -      Not Applicable
  04/15/2026 03 AM PDT            9.83            165         0      Not Applicable
  04/15/2026 04 AM PDT            9.82            163         -      Not Applicable
  04/15/2026 05 AM PDT            9.82            163         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.