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: Sep 04 2026 at 7:22 AM PDTNext Issuance: Sep 05 2026 at 9:00 AM PDT
Action: 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:  09/04/2026 at 07:24 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  09/03/2026 at 01:00 AM PDT
# Maximum Observed Stage:                       9.79 Feet
# Maximum Observed Flow:                        147 cfs
#
# Earliest Date & Time of Maximum Forecast:     09/04/2026 at 08:00 AM PDT
# Maximum Forecast Stage:                       8.68 Feet
# Maximum Forecast Flow:                        25 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  08/30/2026 07 AM PDT            8.30              5                Not Applicable
  08/30/2026 08 AM PDT            8.30              5         0      Not Applicable
  08/30/2026 09 AM PDT            8.30              5         0      Not Applicable
  08/30/2026 10 AM PDT            8.30              5         0      Not Applicable
  08/30/2026 11 AM PDT            8.30              5         0      Not Applicable
  08/30/2026 12 PM PDT            8.30              5         0      Not Applicable
  08/30/2026 01 PM PDT            8.30              5         0      Not Applicable
  08/30/2026 02 PM PDT            8.30              5         0      Not Applicable
  08/30/2026 03 PM PDT            8.30              5         0      Not Applicable
  08/30/2026 04 PM PDT            8.30              5         0      Not Applicable
  08/30/2026 05 PM PDT            8.30              5         0      Not Applicable
  08/30/2026 06 PM PDT            8.30              5         0      Not Applicable
  08/30/2026 07 PM PDT            8.30              5         0      Not Applicable
  08/30/2026 08 PM PDT            8.30              5         0      Not Applicable
  08/30/2026 09 PM PDT            8.30              5         0      Not Applicable
  08/30/2026 10 PM PDT            8.30              5         0      Not Applicable
  08/30/2026 11 PM PDT            8.30              5         0      Not Applicable
  08/31/2026 12 AM PDT            8.30              5         0      Not Applicable
  08/31/2026 01 AM PDT            8.30              5         0      Not Applicable
  08/31/2026 02 AM PDT            8.30              5         0      Not Applicable
  08/31/2026 03 AM PDT            8.31              6         +      Not Applicable
  08/31/2026 04 AM PDT            8.31              6         0      Not Applicable
  08/31/2026 05 AM PDT            8.31              6         0      Not Applicable
  08/31/2026 06 AM PDT            8.30              5         -      Not Applicable
  08/31/2026 07 AM PDT            8.30              5         0      Not Applicable
  08/31/2026 08 AM PDT            8.30              5         0      Not Applicable
  08/31/2026 09 AM PDT            8.30              5         0      Not Applicable
  08/31/2026 10 AM PDT            8.30              5         0      Not Applicable
  08/31/2026 11 AM PDT            8.30              5         0      Not Applicable
  08/31/2026 12 PM PDT            8.30              5         0      Not Applicable
  08/31/2026 01 PM PDT            8.30              5         0      Not Applicable
  08/31/2026 02 PM PDT            8.30              5         0      Not Applicable
  08/31/2026 03 PM PDT            8.30              5         0      Not Applicable
  08/31/2026 04 PM PDT            8.30              5         0      Not Applicable
  08/31/2026 05 PM PDT            8.30              5         0      Not Applicable
  08/31/2026 06 PM PDT            8.30              5         0      Not Applicable
  08/31/2026 07 PM PDT            8.30              5         0      Not Applicable
  08/31/2026 08 PM PDT            8.30              5         0      Not Applicable
  08/31/2026 09 PM PDT            8.30              5         0      Not Applicable
  08/31/2026 10 PM PDT            8.30              5         0      Not Applicable
  08/31/2026 11 PM PDT            8.30              5         0      Not Applicable
  09/01/2026 12 AM PDT            8.30              5         0      Not Applicable
  09/01/2026 01 AM PDT            8.30              5         0      Not Applicable
  09/01/2026 02 AM PDT            8.30              5         0      Not Applicable
  09/01/2026 03 AM PDT            8.31              6         +      Not Applicable
  09/01/2026 04 AM PDT            8.31              6         0      Not Applicable
  09/01/2026 05 AM PDT            8.31              6         0      Not Applicable
  09/01/2026 06 AM PDT            8.31              6         0      Not Applicable
  09/01/2026 07 AM PDT            8.31              6         0      Not Applicable
  09/01/2026 08 AM PDT            8.31              6         0      Not Applicable
  09/01/2026 09 AM PDT            8.31              6         0      Not Applicable
  09/01/2026 10 AM PDT            8.31              6         0      Not Applicable
  09/01/2026 11 AM PDT            8.31              6         0      Not Applicable
  09/01/2026 12 PM PDT            8.31              6         0      Not Applicable
  09/01/2026 01 PM PDT            8.31              6         0      Not Applicable
  09/01/2026 02 PM PDT            8.31              6         0      Not Applicable
  09/01/2026 03 PM PDT            8.31              6         0      Not Applicable
  09/01/2026 04 PM PDT            8.31              6         0      Not Applicable
  09/01/2026 05 PM PDT            8.31              6         0      Not Applicable
  09/01/2026 06 PM PDT            8.31              6         0      Not Applicable
  09/01/2026 07 PM PDT            8.31              6         0      Not Applicable
  09/01/2026 08 PM PDT            8.31              6         0      Not Applicable
  09/01/2026 09 PM PDT            8.31              6         0      Not Applicable
  09/01/2026 10 PM PDT            8.31              6         0      Not Applicable
  09/01/2026 11 PM PDT            8.31              6         0      Not Applicable
  09/02/2026 12 AM PDT            8.32              6         +      Not Applicable
  09/02/2026 01 AM PDT            8.32              6         0      Not Applicable
  09/02/2026 02 AM PDT            8.32              6         0      Not Applicable
  09/02/2026 03 AM PDT            8.32              6         0      Not Applicable
  09/02/2026 04 AM PDT            8.33              6         +      Not Applicable
  09/02/2026 05 AM PDT            8.33              6         0      Not Applicable
  09/02/2026 06 AM PDT            8.33              6         0      Not Applicable
  09/02/2026 07 AM PDT            8.34              7         +      Not Applicable
  09/02/2026 08 AM PDT            8.34              7         0      Not Applicable
  09/02/2026 09 AM PDT            8.34              7         0      Not Applicable
  09/02/2026 10 AM PDT            8.34              7         0      Not Applicable
  09/02/2026 11 AM PDT            8.34              7         0      Not Applicable
  09/02/2026 12 PM PDT            8.34              7         0      Not Applicable
  09/02/2026 01 PM PDT            8.35              7         +      Not Applicable
  09/02/2026 02 PM PDT            8.35              7         0      Not Applicable
  09/02/2026 03 PM PDT            8.35              7         0      Not Applicable
  09/02/2026 04 PM PDT            8.36              7         +      Not Applicable
  09/02/2026 05 PM PDT            8.36              7         0      Not Applicable
  09/02/2026 06 PM PDT            8.37              8         +      Not Applicable
  09/02/2026 07 PM PDT            8.41              9         +      Not Applicable
  09/02/2026 08 PM PDT            8.47             12         +      Not Applicable
  09/02/2026 09 PM PDT            8.55             16         +      Not Applicable
  09/02/2026 10 PM PDT            8.63             21         +      Not Applicable
  09/02/2026 11 PM PDT            8.68             25         +      Not Applicable
  09/03/2026 12 AM PDT            9.77            144         +      Not Applicable
  09/03/2026 01 AM PDT            9.79            147         +      Not Applicable
  09/03/2026 02 AM PDT            9.65            125         -      Not Applicable
  09/03/2026 03 AM PDT            9.54            109         -      Not Applicable
  09/03/2026 04 AM PDT            9.43             94         -      Not Applicable
  09/03/2026 05 AM PDT            9.33             83         -      Not Applicable
  09/03/2026 06 AM PDT            9.27             76         -      Not Applicable
  09/03/2026 07 AM PDT            9.25             75         -      Not Applicable
  09/03/2026 08 AM PDT            9.24             74         -      Not Applicable
  09/03/2026 09 AM PDT            9.21             71         -      Not Applicable
  09/03/2026 10 AM PDT            9.16             66         -      Not Applicable
  09/03/2026 11 AM PDT            9.12             63         -      Not Applicable
  09/03/2026 12 PM PDT            9.09             60         -      Not Applicable
  09/03/2026 01 PM PDT            9.07             58         -      Not Applicable
  09/03/2026 02 PM PDT            9.04             55         -      Not Applicable
  09/03/2026 03 PM PDT            9.02             53         -      Not Applicable
  09/03/2026 04 PM PDT            9.01             52         -      Not Applicable
  09/03/2026 05 PM PDT            9.00             51         -      Not Applicable
  09/03/2026 06 PM PDT            8.99             50         -      Not Applicable
  09/03/2026 07 PM PDT            8.96             47         -      Not Applicable
  09/03/2026 08 PM PDT            8.95             46         -      Not Applicable
  09/03/2026 09 PM PDT            8.92             44         -      Not Applicable
  09/03/2026 10 PM PDT            8.90             42         -      Not Applicable
  09/03/2026 11 PM PDT            8.87             39         -      Not Applicable
  09/04/2026 12 AM PDT            8.85             38         -      Not Applicable
  09/04/2026 01 AM PDT            8.83             36         -      Not Applicable
  09/04/2026 02 AM PDT            8.80             33         -      Not Applicable
  09/04/2026 03 AM PDT            8.78             32         -      Not Applicable
  09/04/2026 04 AM PDT            8.76             30         -      Not Applicable
  09/04/2026 05 AM PDT            8.75             30         -      Not Applicable
  09/04/2026 06 AM PDT            8.73             28         -      Not Applicable
  09/04/2026 07 AM PDT            8.70             26         -      Not Applicable
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  09/04/2026 08 AM PDT            8.68             25                Not Applicable
  09/04/2026 09 AM PDT            8.66             23         -      Not Applicable
  09/04/2026 10 AM PDT            8.64             22         -      Not Applicable
  09/04/2026 11 AM PDT            8.62             21         -      Not Applicable
  09/04/2026 12 PM PDT            8.60             19         -      Not Applicable
  09/04/2026 01 PM PDT            8.57             18         -      Not Applicable
  09/04/2026 02 PM PDT            8.55             16         -      Not Applicable
  09/04/2026 03 PM PDT            8.53             15         -      Not Applicable
  09/04/2026 04 PM PDT            8.50             14         -      Not Applicable
  09/04/2026 05 PM PDT            8.47             12         -      Not Applicable
  09/04/2026 06 PM PDT            8.47             12         0      Not Applicable
  09/04/2026 07 PM PDT            8.47             12         0      Not Applicable
  09/04/2026 08 PM PDT            8.47             12         0      Not Applicable
  09/04/2026 09 PM PDT            8.47             12         0      Not Applicable
  09/04/2026 10 PM PDT            8.47             12         0      Not Applicable
  09/04/2026 11 PM PDT            8.46             12         -      Not Applicable
  09/05/2026 12 AM PDT            8.46             12         0      Not Applicable
  09/05/2026 01 AM PDT            8.46             12         0      Not Applicable
  09/05/2026 02 AM PDT            8.46             12         0      Not Applicable
  09/05/2026 03 AM PDT            8.46             12         0      Not Applicable
  09/05/2026 04 AM PDT            8.46             12         0      Not Applicable
  09/05/2026 05 AM PDT            8.46             12         0      Not Applicable
  09/05/2026 06 AM PDT            8.46             12         0      Not Applicable
  09/05/2026 07 AM PDT            8.46             12         0      Not Applicable
  09/05/2026 08 AM PDT            8.46             12         0      Not Applicable
  09/05/2026 09 AM PDT            8.46             12         0      Not Applicable
  09/05/2026 10 AM PDT            8.46             12         0      Not Applicable
  09/05/2026 11 AM PDT            8.46             12         0      Not Applicable
  09/05/2026 12 PM PDT            8.46             12         0      Not Applicable
  09/05/2026 01 PM PDT            8.46             12         0      Not Applicable
  09/05/2026 02 PM PDT            8.46             12         0      Not Applicable
  09/05/2026 03 PM PDT            8.46             12         0      Not Applicable
  09/05/2026 04 PM PDT            8.45             11         -      Not Applicable
  09/05/2026 05 PM PDT            8.45             11         0      Not Applicable
  09/05/2026 06 PM PDT            8.45             11         0      Not Applicable
  09/05/2026 07 PM PDT            8.45             11         0      Not Applicable
  09/05/2026 08 PM PDT            8.45             11         0      Not Applicable
  09/05/2026 09 PM PDT            8.45             11         0      Not Applicable
  09/05/2026 10 PM PDT            8.45             11         0      Not Applicable
  09/05/2026 11 PM PDT            8.45             11         0      Not Applicable
  09/06/2026 12 AM PDT            8.45             11         0      Not Applicable
  09/06/2026 01 AM PDT            8.45             11         0      Not Applicable
  09/06/2026 02 AM PDT            8.45             11         0      Not Applicable
  09/06/2026 03 AM PDT            8.45             11         0      Not Applicable
  09/06/2026 04 AM PDT            8.45             11         0      Not Applicable
  09/06/2026 05 AM PDT            8.45             11         0      Not Applicable
  09/06/2026 06 AM PDT            8.45             11         0      Not Applicable
  09/06/2026 07 AM PDT            8.45             11         0      Not Applicable
  09/06/2026 08 AM PDT            8.45             11         0      Not Applicable
  09/06/2026 09 AM PDT            8.45             11         0      Not Applicable
  09/06/2026 10 AM PDT            8.45             11         0      Not Applicable
  09/06/2026 11 AM PDT            8.45             11         0      Not Applicable
  09/06/2026 12 PM PDT            8.45             11         0      Not Applicable
  09/06/2026 01 PM PDT            8.45             11         0      Not Applicable
  09/06/2026 02 PM PDT            8.45             11         0      Not Applicable
  09/06/2026 03 PM PDT            8.45             11         0      Not Applicable
  09/06/2026 04 PM PDT            8.44             11         -      Not Applicable
  09/06/2026 05 PM PDT            8.44             11         0      Not Applicable
  09/06/2026 06 PM PDT            8.44             11         0      Not Applicable
  09/06/2026 07 PM PDT            8.44             11         0      Not Applicable
  09/06/2026 08 PM PDT            8.44             11         0      Not Applicable
  09/06/2026 09 PM PDT            8.44             11         0      Not Applicable
  09/06/2026 10 PM PDT            8.44             11         0      Not Applicable
  09/06/2026 11 PM PDT            8.44             11         0      Not Applicable
  09/07/2026 12 AM PDT            8.44             11         0      Not Applicable
  09/07/2026 01 AM PDT            8.44             11         0      Not Applicable
  09/07/2026 02 AM PDT            8.44             11         0      Not Applicable
  09/07/2026 03 AM PDT            8.44             11         0      Not Applicable
  09/07/2026 04 AM PDT            8.44             11         0      Not Applicable
  09/07/2026 05 AM PDT            8.44             11         0      Not Applicable
  09/07/2026 06 AM PDT            8.44             11         0      Not Applicable
  09/07/2026 07 AM PDT            8.44             11         0      Not Applicable
  09/07/2026 08 AM PDT            8.44             11         0      Not Applicable
  09/07/2026 09 AM PDT            8.44             11         0      Not Applicable
  09/07/2026 10 AM PDT            8.44             11         0      Not Applicable
  09/07/2026 11 AM PDT            8.44             11         0      Not Applicable
  09/07/2026 12 PM PDT            8.44             11         0      Not Applicable
  09/07/2026 01 PM PDT            8.44             11         0      Not Applicable
  09/07/2026 02 PM PDT            8.44             11         0      Not Applicable
  09/07/2026 03 PM PDT            8.44             11         0      Not Applicable
  09/07/2026 04 PM PDT            8.44             11         0      Not Applicable
  09/07/2026 05 PM PDT            8.43             10         -      Not Applicable
  09/07/2026 06 PM PDT            8.43             10         0      Not Applicable
  09/07/2026 07 PM PDT            8.43             10         0      Not Applicable
  09/07/2026 08 PM PDT            8.43             10         0      Not Applicable
  09/07/2026 09 PM PDT            8.43             10         0      Not Applicable
  09/07/2026 10 PM PDT            8.43             10         0      Not Applicable
  09/07/2026 11 PM PDT            8.43             10         0      Not Applicable
  09/08/2026 12 AM PDT            8.43             10         0      Not Applicable
  09/08/2026 01 AM PDT            8.43             10         0      Not Applicable
  09/08/2026 02 AM PDT            8.43             10         0      Not Applicable
  09/08/2026 03 AM PDT            8.43             10         0      Not Applicable
  09/08/2026 04 AM PDT            8.43             10         0      Not Applicable
  09/08/2026 05 AM PDT            8.43             10         0      Not Applicable
  09/08/2026 06 AM PDT            8.43             10         0      Not Applicable
  09/08/2026 07 AM PDT            8.43             10         0      Not Applicable
  09/08/2026 08 AM PDT            8.43             10         0      Not Applicable
  09/08/2026 09 AM PDT            8.43             10         0      Not Applicable
  09/08/2026 10 AM PDT            8.43             10         0      Not Applicable
  09/08/2026 11 AM PDT            8.43             10         0      Not Applicable
  09/08/2026 12 PM PDT            8.43             10         0      Not Applicable
  09/08/2026 01 PM PDT            8.43             10         0      Not Applicable
  09/08/2026 02 PM PDT            8.43             10         0      Not Applicable
  09/08/2026 03 PM PDT            8.43             10         0      Not Applicable
  09/08/2026 04 PM PDT            8.43             10         0      Not Applicable
  09/08/2026 05 PM PDT            8.43             10         0      Not Applicable
  09/08/2026 06 PM PDT            8.42             10         -      Not Applicable
  09/08/2026 07 PM PDT            8.42             10         0      Not Applicable
  09/08/2026 08 PM PDT            8.42             10         0      Not Applicable
  09/08/2026 09 PM PDT            8.42             10         0      Not Applicable
  09/08/2026 10 PM PDT            8.42             10         0      Not Applicable
  09/08/2026 11 PM PDT            8.42             10         0      Not Applicable
  09/09/2026 12 AM PDT            8.42             10         0      Not Applicable
  09/09/2026 01 AM PDT            8.42             10         0      Not Applicable
  09/09/2026 02 AM PDT            8.42             10         0      Not Applicable
  09/09/2026 03 AM PDT            8.42             10         0      Not Applicable
  09/09/2026 04 AM PDT            8.42             10         0      Not Applicable
  09/09/2026 05 AM PDT            8.42             10         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.