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 13 2026 at 1:03 PM PDTNext Issuance: Apr 14 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:  04/13/2026 at 01:05 PM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  04/12/2026 at 02:00 PM PDT
# Maximum Observed Stage:                       11.09 Feet
# Maximum Observed Flow:                        434 cfs
#
# Earliest Date & Time of Maximum Forecast:     04/16/2026 at 04:00 AM PDT
# Maximum Forecast Stage:                       10.35 Feet
# Maximum Forecast Flow:                        268 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  04/08/2026 01 PM PDT            9.11             75                Not Applicable
  04/08/2026 02 PM PDT            9.11             75         0      Not Applicable
  04/08/2026 03 PM PDT            9.11             75         0      Not Applicable
  04/08/2026 04 PM PDT            9.11             75         0      Not Applicable
  04/08/2026 05 PM PDT            9.11             75         0      Not Applicable
  04/08/2026 06 PM PDT            9.11             75         0      Not Applicable
  04/08/2026 07 PM PDT            9.11             75         0      Not Applicable
  04/08/2026 08 PM PDT            9.11             75         0      Not Applicable
  04/08/2026 09 PM PDT            9.11             75         0      Not Applicable
  04/08/2026 10 PM PDT            9.11             75         0      Not Applicable
  04/08/2026 11 PM PDT            9.11             75         0      Not Applicable
  04/09/2026 12 AM PDT            9.11             75         0      Not Applicable
  04/09/2026 01 AM PDT            9.11             75         0      Not Applicable
  04/09/2026 02 AM PDT            9.11             75         0      Not Applicable
  04/09/2026 03 AM PDT            9.11             75         0      Not Applicable
  04/09/2026 04 AM PDT            9.11             75         0      Not Applicable
  04/09/2026 05 AM PDT            9.11             75         0      Not Applicable
  04/09/2026 06 AM PDT            9.11             75         0      Not Applicable
  04/09/2026 07 AM PDT            9.11             75         0      Not Applicable
  04/09/2026 08 AM PDT            9.11             75         0      Not Applicable
  04/09/2026 09 AM PDT            9.11             75         0      Not Applicable
  04/09/2026 10 AM PDT            9.11             75         0      Not Applicable
  04/09/2026 11 AM PDT            9.11             75         0      Not Applicable
  04/09/2026 12 PM PDT            9.11             75         0      Not Applicable
  04/09/2026 01 PM PDT            9.11             75         0      Not Applicable
  04/09/2026 02 PM PDT            9.11             75         0      Not Applicable
  04/09/2026 03 PM PDT            9.11             75         0      Not Applicable
  04/09/2026 04 PM PDT            9.11             75         0      Not Applicable
  04/09/2026 05 PM PDT            9.11             75         0      Not Applicable
  04/09/2026 06 PM PDT            9.11             75         0      Not Applicable
  04/09/2026 07 PM PDT            9.11             75         0      Not Applicable
  04/09/2026 08 PM PDT            9.11             75         0      Not Applicable
  04/09/2026 09 PM PDT            9.11             75         0      Not Applicable
  04/09/2026 10 PM PDT            9.11             75         0      Not Applicable
  04/09/2026 11 PM PDT            9.11             75         0      Not Applicable
  04/10/2026 12 AM PDT            9.11             75         0      Not Applicable
  04/10/2026 01 AM PDT            9.11             75         0      Not Applicable
  04/10/2026 02 AM PDT            9.11             75         0      Not Applicable
  04/10/2026 03 AM PDT            9.11             75         0      Not Applicable
  04/10/2026 04 AM PDT            9.11             75         0      Not Applicable
  04/10/2026 05 AM PDT            9.11             75         0      Not Applicable
  04/10/2026 06 AM PDT            9.11             75         0      Not Applicable
  04/10/2026 07 AM PDT            9.11             75         0      Not Applicable
  04/10/2026 08 AM PDT            9.11             75         0      Not Applicable
  04/10/2026 09 AM PDT            9.11             75         0      Not Applicable
  04/10/2026 10 AM PDT            9.11             75         0      Not Applicable
  04/10/2026 11 AM PDT            9.12             76         +      Not Applicable
  04/10/2026 12 PM PDT            9.13             78         +      Not Applicable
  04/10/2026 01 PM PDT            9.13             78         0      Not Applicable
  04/10/2026 02 PM PDT            9.12             76         -      Not Applicable
  04/10/2026 03 PM PDT            9.12             76         0      Not Applicable
  04/10/2026 04 PM PDT            9.12             76         0      Not Applicable
  04/10/2026 05 PM PDT            9.12             76         0      Not Applicable
  04/10/2026 06 PM PDT            9.11             75         -      Not Applicable
  04/10/2026 07 PM PDT            9.11             75         0      Not Applicable
  04/10/2026 08 PM PDT            9.11             75         0      Not Applicable
  04/10/2026 09 PM PDT            9.11             75         0      Not Applicable
  04/10/2026 10 PM PDT            9.11             75         0      Not Applicable
  04/10/2026 11 PM PDT            9.12             76         +      Not Applicable
  04/11/2026 12 AM PDT            9.14             79         +      Not Applicable
  04/11/2026 01 AM PDT            9.15             79         +      Not Applicable
  04/11/2026 02 AM PDT            9.16             80         +      Not Applicable
  04/11/2026 03 AM PDT            9.17             81         +      Not Applicable
  04/11/2026 04 AM PDT            9.19             83         +      Not Applicable
  04/11/2026 05 AM PDT            9.22             87         +      Not Applicable
  04/11/2026 06 AM PDT            9.24             89         +      Not Applicable
  04/11/2026 07 AM PDT            9.27             92         +      Not Applicable
  04/11/2026 08 AM PDT            9.29             95         +      Not Applicable
  04/11/2026 09 AM PDT            9.32             98         +      Not Applicable
  04/11/2026 10 AM PDT            9.34            101         +      Not Applicable
  04/11/2026 11 AM PDT            9.37            104         +      Not Applicable
  04/11/2026 12 PM PDT            9.41            110         +      Not Applicable
  04/11/2026 01 PM PDT            9.52            125         +      Not Applicable
  04/11/2026 02 PM PDT            9.62            140         +      Not Applicable
  04/11/2026 03 PM PDT            9.67            147         +      Not Applicable
  04/11/2026 04 PM PDT            9.73            157         +      Not Applicable
  04/11/2026 05 PM PDT            9.78            165         +      Not Applicable
  04/11/2026 06 PM PDT            9.84            175         +      Not Applicable
  04/11/2026 07 PM PDT            9.93            190         +      Not Applicable
  04/11/2026 08 PM PDT            9.99            200         +      Not Applicable
  04/11/2026 09 PM PDT            9.98            199         -      Not Applicable
  04/11/2026 10 PM PDT            9.94            192         -      Not Applicable
  04/11/2026 11 PM PDT            9.92            188         -      Not Applicable
  04/12/2026 12 AM PDT            9.91            186         -      Not Applicable
  04/12/2026 01 AM PDT            9.89            183         -      Not Applicable
  04/12/2026 02 AM PDT            9.89            183         0      Not Applicable
  04/12/2026 03 AM PDT            9.91            186         +      Not Applicable
  04/12/2026 04 AM PDT            9.97            197         +      Not Applicable
  04/12/2026 05 AM PDT           10.03            207         +      Not Applicable
  04/12/2026 06 AM PDT           10.10            220         +      Not Applicable
  04/12/2026 07 AM PDT           10.25            248         +      Not Applicable
  04/12/2026 08 AM PDT           10.37            272         +      Not Applicable
  04/12/2026 09 AM PDT           10.48            295         +      Not Applicable
  04/12/2026 10 AM PDT           10.61            322         +      Not Applicable
  04/12/2026 11 AM PDT           10.83            372         +      Not Applicable
  04/12/2026 12 PM PDT           10.95            400         +      Not Applicable
  04/12/2026 01 PM PDT           11.07            429         +      Not Applicable
  04/12/2026 02 PM PDT           11.09            434         +      Not Applicable
  04/12/2026 03 PM PDT           11.07            429         -      Not Applicable
  04/12/2026 04 PM PDT           11.04            421         -      Not Applicable
  04/12/2026 05 PM PDT           10.98            407         -      Not Applicable
  04/12/2026 06 PM PDT           10.94            397         -      Not Applicable
  04/12/2026 07 PM PDT           10.89            386         -      Not Applicable
  04/12/2026 08 PM PDT           10.86            379         -      Not Applicable
  04/12/2026 09 PM PDT           10.84            374         -      Not Applicable
  04/12/2026 10 PM PDT           10.79            362         -      Not Applicable
  04/12/2026 11 PM PDT           10.75            353         -      Not Applicable
  04/13/2026 12 AM PDT           10.70            342         -      Not Applicable
  04/13/2026 01 AM PDT           10.67            335         -      Not Applicable
  04/13/2026 02 AM PDT           10.63            327         -      Not Applicable
  04/13/2026 03 AM PDT           10.59            318         -      Not Applicable
  04/13/2026 04 AM PDT           10.56            312         -      Not Applicable
  04/13/2026 05 AM PDT           10.52            303         -      Not Applicable
  04/13/2026 06 AM PDT           10.49            297         -      Not Applicable
  04/13/2026 07 AM PDT           10.46            291         -      Not Applicable
  04/13/2026 08 AM PDT           10.43            284         -      Not Applicable
  04/13/2026 09 AM PDT           10.40            278         -      Not Applicable
  04/13/2026 10 AM PDT           10.39            276         -      Not Applicable
  04/13/2026 11 AM PDT           10.36            270         -      Not Applicable
  04/13/2026 12 PM PDT           10.34            266         -      Not Applicable
  04/13/2026 01 PM PDT           10.31            260         -      Not Applicable
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  04/13/2026 02 PM PDT           10.31            260                Not Applicable
  04/13/2026 03 PM PDT           10.29            256         -      Not Applicable
  04/13/2026 04 PM PDT           10.28            254         -      Not Applicable
  04/13/2026 05 PM PDT           10.26            250         -      Not Applicable
  04/13/2026 06 PM PDT           10.24            246         -      Not Applicable
  04/13/2026 07 PM PDT           10.23            245         -      Not Applicable
  04/13/2026 08 PM PDT           10.22            243         -      Not Applicable
  04/13/2026 09 PM PDT           10.21            241         -      Not Applicable
  04/13/2026 10 PM PDT           10.20            239         -      Not Applicable
  04/13/2026 11 PM PDT           10.19            237         -      Not Applicable
  04/14/2026 12 AM PDT           10.18            235         -      Not Applicable
  04/14/2026 01 AM PDT           10.17            233         -      Not Applicable
  04/14/2026 02 AM PDT           10.16            231         -      Not Applicable
  04/14/2026 03 AM PDT           10.15            229         -      Not Applicable
  04/14/2026 04 AM PDT           10.14            227         -      Not Applicable
  04/14/2026 05 AM PDT           10.14            227         0      Not Applicable
  04/14/2026 06 AM PDT           10.13            226         -      Not Applicable
  04/14/2026 07 AM PDT           10.12            224         -      Not Applicable
  04/14/2026 08 AM PDT           10.12            224         0      Not Applicable
  04/14/2026 09 AM PDT           10.11            222         -      Not Applicable
  04/14/2026 10 AM PDT           10.10            220         -      Not Applicable
  04/14/2026 11 AM PDT           10.10            220         0      Not Applicable
  04/14/2026 12 PM PDT           10.09            218         -      Not Applicable
  04/14/2026 01 PM PDT           10.08            216         -      Not Applicable
  04/14/2026 02 PM PDT           10.08            216         0      Not Applicable
  04/14/2026 03 PM PDT           10.07            215         -      Not Applicable
  04/14/2026 04 PM PDT           10.06            213         -      Not Applicable
  04/14/2026 05 PM PDT           10.06            213         0      Not Applicable
  04/14/2026 06 PM PDT           10.05            211         -      Not Applicable
  04/14/2026 07 PM PDT           10.05            211         0      Not Applicable
  04/14/2026 08 PM PDT           10.04            209         -      Not Applicable
  04/14/2026 09 PM PDT           10.04            209         0      Not Applicable
  04/14/2026 10 PM PDT           10.03            207         -      Not Applicable
  04/14/2026 11 PM PDT           10.02            206         -      Not Applicable
  04/15/2026 12 AM PDT           10.02            206         0      Not Applicable
  04/15/2026 01 AM PDT           10.01            204         -      Not Applicable
  04/15/2026 02 AM PDT           10.01            204         0      Not Applicable
  04/15/2026 03 AM PDT           10.00            202         -      Not Applicable
  04/15/2026 04 AM PDT           10.00            202         0      Not Applicable
  04/15/2026 05 AM PDT            9.99            200         -      Not Applicable
  04/15/2026 06 AM PDT            9.99            200         0      Not Applicable
  04/15/2026 07 AM PDT            9.98            199         -      Not Applicable
  04/15/2026 08 AM PDT            9.98            199         0      Not Applicable
  04/15/2026 09 AM PDT            9.97            197         -      Not Applicable
  04/15/2026 10 AM PDT            9.97            197         0      Not Applicable
  04/15/2026 11 AM PDT            9.96            195         -      Not Applicable
  04/15/2026 12 PM PDT            9.96            195         0      Not Applicable
  04/15/2026 01 PM PDT            9.96            195         0      Not Applicable
  04/15/2026 02 PM PDT            9.95            193         -      Not Applicable
  04/15/2026 03 PM PDT            9.95            193         0      Not Applicable
  04/15/2026 04 PM PDT            9.95            193         0      Not Applicable
  04/15/2026 05 PM PDT            9.95            193         0      Not Applicable
  04/15/2026 06 PM PDT            9.96            195         +      Not Applicable
  04/15/2026 07 PM PDT            9.97            197         +      Not Applicable
  04/15/2026 08 PM PDT            9.99            200         +      Not Applicable
  04/15/2026 09 PM PDT           10.04            209         +      Not Applicable
  04/15/2026 10 PM PDT           10.10            220         +      Not Applicable
  04/15/2026 11 PM PDT           10.16            231         +      Not Applicable
  04/16/2026 12 AM PDT           10.21            241         +      Not Applicable
  04/16/2026 01 AM PDT           10.26            250         +      Not Applicable
  04/16/2026 02 AM PDT           10.30            258         +      Not Applicable
  04/16/2026 03 AM PDT           10.33            264         +      Not Applicable
  04/16/2026 04 AM PDT           10.35            268         +      Not Applicable
  04/16/2026 05 AM PDT           10.35            268         0      Not Applicable
  04/16/2026 06 AM PDT           10.35            268         0      Not Applicable
  04/16/2026 07 AM PDT           10.33            264         -      Not Applicable
  04/16/2026 08 AM PDT           10.31            260         -      Not Applicable
  04/16/2026 09 AM PDT           10.29            256         -      Not Applicable
  04/16/2026 10 AM PDT           10.26            250         -      Not Applicable
  04/16/2026 11 AM PDT           10.23            245         -      Not Applicable
  04/16/2026 12 PM PDT           10.20            239         -      Not Applicable
  04/16/2026 01 PM PDT           10.17            233         -      Not Applicable
  04/16/2026 02 PM PDT           10.14            227         -      Not Applicable
  04/16/2026 03 PM PDT           10.12            224         -      Not Applicable
  04/16/2026 04 PM PDT           10.10            220         -      Not Applicable
  04/16/2026 05 PM PDT           10.08            216         -      Not Applicable
  04/16/2026 06 PM PDT           10.06            213         -      Not Applicable
  04/16/2026 07 PM PDT           10.04            209         -      Not Applicable
  04/16/2026 08 PM PDT           10.02            206         -      Not Applicable
  04/16/2026 09 PM PDT           10.01            204         -      Not Applicable
  04/16/2026 10 PM PDT           10.00            202         -      Not Applicable
  04/16/2026 11 PM PDT            9.98            199         -      Not Applicable
  04/17/2026 12 AM PDT            9.97            197         -      Not Applicable
  04/17/2026 01 AM PDT            9.96            195         -      Not Applicable
  04/17/2026 02 AM PDT            9.95            193         -      Not Applicable
  04/17/2026 03 AM PDT            9.94            192         -      Not Applicable
  04/17/2026 04 AM PDT            9.94            192         0      Not Applicable
  04/17/2026 05 AM PDT            9.93            190         -      Not Applicable
  04/17/2026 06 AM PDT            9.92            188         -      Not Applicable
  04/17/2026 07 AM PDT            9.91            186         -      Not Applicable
  04/17/2026 08 AM PDT            9.91            186         0      Not Applicable
  04/17/2026 09 AM PDT            9.90            185         -      Not Applicable
  04/17/2026 10 AM PDT            9.89            183         -      Not Applicable
  04/17/2026 11 AM PDT            9.89            183         0      Not Applicable
  04/17/2026 12 PM PDT            9.88            181         -      Not Applicable
  04/17/2026 01 PM PDT            9.88            181         0      Not Applicable
  04/17/2026 02 PM PDT            9.87            180         -      Not Applicable
  04/17/2026 03 PM PDT            9.86            178         -      Not Applicable
  04/17/2026 04 PM PDT            9.86            178         0      Not Applicable
  04/17/2026 05 PM PDT            9.85            176         -      Not Applicable
  04/17/2026 06 PM PDT            9.85            176         0      Not Applicable
  04/17/2026 07 PM PDT            9.84            175         -      Not Applicable
  04/17/2026 08 PM PDT            9.84            175         0      Not Applicable
  04/17/2026 09 PM PDT            9.83            173         -      Not Applicable
  04/17/2026 10 PM PDT            9.82            171         -      Not Applicable
  04/17/2026 11 PM PDT            9.82            171         0      Not Applicable
  04/18/2026 12 AM PDT            9.81            170         -      Not Applicable
  04/18/2026 01 AM PDT            9.81            170         0      Not Applicable
  04/18/2026 02 AM PDT            9.80            168         -      Not Applicable
  04/18/2026 03 AM PDT            9.80            168         0      Not Applicable
  04/18/2026 04 AM PDT            9.79            166         -      Not Applicable
  04/18/2026 05 AM PDT            9.79            166         0      Not Applicable
  04/18/2026 06 AM PDT            9.78            165         -      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.