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 19 2026 at 7:10 AM PDTNext Issuance: Apr 20 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:  04/19/2026 at 07:12 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  04/14/2026 at 07:00 AM PDT
# Maximum Observed Stage:                       9.98 Feet
# Maximum Observed Flow:                        199 cfs
#
# Earliest Date & Time of Maximum Forecast:     04/20/2026 at 10:00 PM PDT
# Maximum Forecast Stage:                       11.33 Feet
# Maximum Forecast Flow:                        517 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  04/14/2026 07 AM PDT            9.98            199                Not Applicable
  04/14/2026 08 AM PDT            9.96            195         -      Not Applicable
  04/14/2026 09 AM PDT            9.96            195         0      Not Applicable
  04/14/2026 10 AM PDT            9.94            192         -      Not Applicable
  04/14/2026 11 AM PDT            9.93            190         -      Not Applicable
  04/14/2026 12 PM PDT            9.93            190         0      Not Applicable
  04/14/2026 01 PM PDT            9.92            188         -      Not Applicable
  04/14/2026 02 PM PDT            9.90            185         -      Not Applicable
  04/14/2026 03 PM PDT            9.90            185         0      Not Applicable
  04/14/2026 04 PM PDT            9.88            181         -      Not Applicable
  04/14/2026 05 PM PDT            9.87            180         -      Not Applicable
  04/14/2026 06 PM PDT            9.86            178         -      Not Applicable
  04/14/2026 07 PM PDT            9.85            176         -      Not Applicable
  04/14/2026 08 PM PDT            9.83            173         -      Not Applicable
  04/14/2026 09 PM PDT            9.84            175         +      Not Applicable
  04/14/2026 10 PM PDT            9.81            170         -      Not Applicable
  04/14/2026 11 PM PDT            9.80            168         -      Not Applicable
  04/15/2026 12 AM PDT            9.80            168         0      Not Applicable
  04/15/2026 01 AM PDT            9.79            166         -      Not Applicable
  04/15/2026 02 AM PDT            9.77            163         -      Not Applicable
  04/15/2026 03 AM PDT            9.77            163         0      Not Applicable
  04/15/2026 04 AM PDT            9.76            162         -      Not Applicable
  04/15/2026 05 AM PDT            9.75            160         -      Not Applicable
  04/15/2026 06 AM PDT            9.75            160         0      Not Applicable
  04/15/2026 07 AM PDT            9.75            160         0      Not Applicable
  04/15/2026 08 AM PDT            9.73            157         -      Not Applicable
  04/15/2026 09 AM PDT            9.73            157         0      Not Applicable
  04/15/2026 10 AM PDT            9.73            157         0      Not Applicable
  04/15/2026 11 AM PDT            9.73            157         0      Not Applicable
  04/15/2026 12 PM PDT            9.72            155         -      Not Applicable
  04/15/2026 01 PM PDT            9.71            154         -      Not Applicable
  04/15/2026 02 PM PDT            9.72            155         +      Not Applicable
  04/15/2026 03 PM PDT            9.70            152         -      Not Applicable
  04/15/2026 04 PM PDT            9.71            154         +      Not Applicable
  04/15/2026 05 PM PDT            9.71            154         0      Not Applicable
  04/15/2026 06 PM PDT            9.72            155         +      Not Applicable
  04/15/2026 07 PM PDT            9.73            157         +      Not Applicable
  04/15/2026 08 PM PDT            9.74            158         +      Not Applicable
  04/15/2026 09 PM PDT            9.74            158         0      Not Applicable
  04/15/2026 10 PM PDT            9.75            160         +      Not Applicable
  04/15/2026 11 PM PDT            9.75            160         0      Not Applicable
  04/16/2026 12 AM PDT            9.73            157         -      Not Applicable
  04/16/2026 01 AM PDT            9.71            154         -      Not Applicable
  04/16/2026 02 AM PDT            9.70            152         -      Not Applicable
  04/16/2026 03 AM PDT            9.69            150         -      Not Applicable
  04/16/2026 04 AM PDT            9.69            150         0      Not Applicable
  04/16/2026 05 AM PDT            9.67            147         -      Not Applicable
  04/16/2026 06 AM PDT            9.67            147         0      Not Applicable
  04/16/2026 07 AM PDT            9.66            146         -      Not Applicable
  04/16/2026 08 AM PDT            9.66            146         0      Not Applicable
  04/16/2026 09 AM PDT            9.65            144         -      Not Applicable
  04/16/2026 10 AM PDT            9.64            143         -      Not Applicable
  04/16/2026 11 AM PDT            9.63            141         -      Not Applicable
  04/16/2026 12 PM PDT            9.63            141         0      Not Applicable
  04/16/2026 01 PM PDT            9.63            141         0      Not Applicable
  04/16/2026 02 PM PDT            9.61            138         -      Not Applicable
  04/16/2026 03 PM PDT            9.62            140         +      Not Applicable
  04/16/2026 04 PM PDT            9.60            137         -      Not Applicable
  04/16/2026 05 PM PDT            9.60            137         0      Not Applicable
  04/16/2026 06 PM PDT            9.59            135         -      Not Applicable
  04/16/2026 07 PM PDT            9.58            134         -      Not Applicable
  04/16/2026 08 PM PDT            9.58            134         0      Not Applicable
  04/16/2026 09 PM PDT            9.58            134         0      Not Applicable
  04/16/2026 10 PM PDT            9.57            132         -      Not Applicable
  04/16/2026 11 PM PDT            9.57            132         0      Not Applicable
  04/17/2026 12 AM PDT            9.56            131         -      Not Applicable
  04/17/2026 01 AM PDT            9.55            129         -      Not Applicable
  04/17/2026 02 AM PDT            9.56            131         +      Not Applicable
  04/17/2026 03 AM PDT            9.55            129         -      Not Applicable
  04/17/2026 04 AM PDT            9.55            129         0      Not Applicable
  04/17/2026 05 AM PDT            9.54            128         -      Not Applicable
  04/17/2026 06 AM PDT            9.53            126         -      Not Applicable
  04/17/2026 07 AM PDT            9.53            126         0      Not Applicable
  04/17/2026 08 AM PDT            9.53            126         0      Not Applicable
  04/17/2026 09 AM PDT            9.53            126         0      Not Applicable
  04/17/2026 10 AM PDT            9.53            126         0      Not Applicable
  04/17/2026 11 AM PDT            9.52            125         -      Not Applicable
  04/17/2026 12 PM PDT            9.52            125         0      Not Applicable
  04/17/2026 01 PM PDT            9.52            125         0      Not Applicable
  04/17/2026 02 PM PDT            9.53            126         +      Not Applicable
  04/17/2026 03 PM PDT            9.52            125         -      Not Applicable
  04/17/2026 04 PM PDT            9.52            125         0      Not Applicable
  04/17/2026 05 PM PDT            9.51            124         -      Not Applicable
  04/17/2026 06 PM PDT            9.50            122         -      Not Applicable
  04/17/2026 07 PM PDT            9.50            122         0      Not Applicable
  04/17/2026 08 PM PDT            9.49            121         -      Not Applicable
  04/17/2026 09 PM PDT            9.49            121         0      Not Applicable
  04/17/2026 10 PM PDT            9.49            121         0      Not Applicable
  04/17/2026 11 PM PDT            9.48            119         -      Not Applicable
  04/18/2026 12 AM PDT            9.47            118         -      Not Applicable
  04/18/2026 01 AM PDT            9.47            118         0      Not Applicable
  04/18/2026 02 AM PDT            9.47            118         0      Not Applicable
  04/18/2026 03 AM PDT            9.47            118         0      Not Applicable
  04/18/2026 04 AM PDT            9.46            117         -      Not Applicable
  04/18/2026 05 AM PDT            9.46            117         0      Not Applicable
  04/18/2026 06 AM PDT            9.45            115         -      Not Applicable
  04/18/2026 07 AM PDT            9.45            115         0      Not Applicable
  04/18/2026 08 AM PDT            9.44            114         -      Not Applicable
  04/18/2026 09 AM PDT            9.45            115         +      Not Applicable
  04/18/2026 10 AM PDT            9.45            115         0      Not Applicable
  04/18/2026 11 AM PDT            9.45            115         0      Not Applicable
  04/18/2026 12 PM PDT            9.44            114         -      Not Applicable
  04/18/2026 01 PM PDT            9.45            115         +      Not Applicable
  04/18/2026 02 PM PDT            9.45            115         0      Not Applicable
  04/18/2026 03 PM PDT            9.45            115         0      Not Applicable
  04/18/2026 04 PM PDT            9.44            114         -      Not Applicable
  04/18/2026 05 PM PDT            9.44            114         0      Not Applicable
  04/18/2026 06 PM PDT            9.43            112         -      Not Applicable
  04/18/2026 07 PM PDT            9.42            111         -      Not Applicable
  04/18/2026 08 PM PDT            9.43            112         +      Not Applicable
  04/18/2026 09 PM PDT            9.42            111         -      Not Applicable
  04/18/2026 10 PM PDT            9.41            110         -      Not Applicable
  04/18/2026 11 PM PDT            9.42            111         +      Not Applicable
  04/19/2026 12 AM PDT            9.41            110         -      Not Applicable
  04/19/2026 01 AM PDT            9.41            110         0      Not Applicable
  04/19/2026 02 AM PDT            9.40            108         -      Not Applicable
  04/19/2026 03 AM PDT            9.40            108         0      Not Applicable
  04/19/2026 04 AM PDT            9.40            108         0      Not Applicable
  04/19/2026 05 AM PDT            9.40            108         0      Not Applicable
  04/19/2026 06 AM PDT            9.40            108         0      Not Applicable
  04/19/2026 07 AM PDT            9.40            108         0      Not Applicable
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  04/19/2026 08 AM PDT            9.40            108                Not Applicable
  04/19/2026 09 AM PDT            9.40            108         0      Not Applicable
  04/19/2026 10 AM PDT            9.39            107         -      Not Applicable
  04/19/2026 11 AM PDT            9.39            107         0      Not Applicable
  04/19/2026 12 PM PDT            9.39            107         0      Not Applicable
  04/19/2026 01 PM PDT            9.39            107         0      Not Applicable
  04/19/2026 02 PM PDT            9.39            107         0      Not Applicable
  04/19/2026 03 PM PDT            9.39            107         0      Not Applicable
  04/19/2026 04 PM PDT            9.39            107         0      Not Applicable
  04/19/2026 05 PM PDT            9.39            107         0      Not Applicable
  04/19/2026 06 PM PDT            9.39            107         0      Not Applicable
  04/19/2026 07 PM PDT            9.39            107         0      Not Applicable
  04/19/2026 08 PM PDT            9.39            107         0      Not Applicable
  04/19/2026 09 PM PDT            9.39            107         0      Not Applicable
  04/19/2026 10 PM PDT            9.39            107         0      Not Applicable
  04/19/2026 11 PM PDT            9.39            107         0      Not Applicable
  04/20/2026 12 AM PDT            9.39            107         0      Not Applicable
  04/20/2026 01 AM PDT            9.39            107         0      Not Applicable
  04/20/2026 02 AM PDT            9.39            107         0      Not Applicable
  04/20/2026 03 AM PDT            9.39            107         0      Not Applicable
  04/20/2026 04 AM PDT            9.40            108         +      Not Applicable
  04/20/2026 05 AM PDT            9.41            110         +      Not Applicable
  04/20/2026 06 AM PDT            9.42            111         +      Not Applicable
  04/20/2026 07 AM PDT            9.43            112         +      Not Applicable
  04/20/2026 08 AM PDT            9.45            115         +      Not Applicable
  04/20/2026 09 AM PDT            9.47            118         +      Not Applicable
  04/20/2026 10 AM PDT            9.52            125         +      Not Applicable
  04/20/2026 11 AM PDT            9.64            143         +      Not Applicable
  04/20/2026 12 PM PDT            9.84            175         +      Not Applicable
  04/20/2026 01 PM PDT           10.09            218         +      Not Applicable
  04/20/2026 02 PM PDT           10.34            266         +      Not Applicable
  04/20/2026 03 PM PDT           10.58            316         +      Not Applicable
  04/20/2026 04 PM PDT           10.78            360         +      Not Applicable
  04/20/2026 05 PM PDT           10.95            400         +      Not Applicable
  04/20/2026 06 PM PDT           11.10            436         +      Not Applicable
  04/20/2026 07 PM PDT           11.19            467         +      Not Applicable
  04/20/2026 08 PM PDT           11.26            491         +      Not Applicable
  04/20/2026 09 PM PDT           11.32            513         +      Not Applicable
  04/20/2026 10 PM PDT           11.33            517         +      Not Applicable
  04/20/2026 11 PM PDT           11.31            509         -      Not Applicable
  04/21/2026 12 AM PDT           11.27            495         -      Not Applicable
  04/21/2026 01 AM PDT           11.24            484         -      Not Applicable
  04/21/2026 02 AM PDT           11.20            470         -      Not Applicable
  04/21/2026 03 AM PDT           11.16            457         -      Not Applicable
  04/21/2026 04 AM PDT           11.11            440         -      Not Applicable
  04/21/2026 05 AM PDT           11.06            426         -      Not Applicable
  04/21/2026 06 AM PDT           11.01            414         -      Not Applicable
  04/21/2026 07 AM PDT           10.96            402         -      Not Applicable
  04/21/2026 08 AM PDT           10.91            390         -      Not Applicable
  04/21/2026 09 AM PDT           10.88            383         -      Not Applicable
  04/21/2026 10 AM PDT           10.86            379         -      Not Applicable
  04/21/2026 11 AM PDT           10.85            376         -      Not Applicable
  04/21/2026 12 PM PDT           10.84            374         -      Not Applicable
  04/21/2026 01 PM PDT           10.85            376         +      Not Applicable
  04/21/2026 02 PM PDT           10.86            379         +      Not Applicable
  04/21/2026 03 PM PDT           10.89            386         +      Not Applicable
  04/21/2026 04 PM PDT           10.93            395         +      Not Applicable
  04/21/2026 05 PM PDT           10.98            407         +      Not Applicable
  04/21/2026 06 PM PDT           11.04            421         +      Not Applicable
  04/21/2026 07 PM PDT           11.10            436         +      Not Applicable
  04/21/2026 08 PM PDT           11.14            450         +      Not Applicable
  04/21/2026 09 PM PDT           11.17            460         +      Not Applicable
  04/21/2026 10 PM PDT           11.19            467         +      Not Applicable
  04/21/2026 11 PM PDT           11.20            470         +      Not Applicable
  04/22/2026 12 AM PDT           11.20            470         0      Not Applicable
  04/22/2026 01 AM PDT           11.20            470         0      Not Applicable
  04/22/2026 02 AM PDT           11.19            467         -      Not Applicable
  04/22/2026 03 AM PDT           11.17            460         -      Not Applicable
  04/22/2026 04 AM PDT           11.15            453         -      Not Applicable
  04/22/2026 05 AM PDT           11.13            446         -      Not Applicable
  04/22/2026 06 AM PDT           11.11            440         -      Not Applicable
  04/22/2026 07 AM PDT           11.08            431         -      Not Applicable
  04/22/2026 08 AM PDT           11.02            417         -      Not Applicable
  04/22/2026 09 AM PDT           10.94            397         -      Not Applicable
  04/22/2026 10 AM PDT           10.83            372         -      Not Applicable
  04/22/2026 11 AM PDT           10.72            347         -      Not Applicable
  04/22/2026 12 PM PDT           10.65            331         -      Not Applicable
  04/22/2026 01 PM PDT           10.61            322         -      Not Applicable
  04/22/2026 02 PM PDT           10.60            320         -      Not Applicable
  04/22/2026 03 PM PDT           10.60            320         0      Not Applicable
  04/22/2026 04 PM PDT           10.60            320         0      Not Applicable
  04/22/2026 05 PM PDT           10.60            320         0      Not Applicable
  04/22/2026 06 PM PDT           10.60            320         0      Not Applicable
  04/22/2026 07 PM PDT           10.60            320         0      Not Applicable
  04/22/2026 08 PM PDT           10.60            320         0      Not Applicable
  04/22/2026 09 PM PDT           10.60            320         0      Not Applicable
  04/22/2026 10 PM PDT           10.59            318         -      Not Applicable
  04/22/2026 11 PM PDT           10.58            316         -      Not Applicable
  04/23/2026 12 AM PDT           10.57            314         -      Not Applicable
  04/23/2026 01 AM PDT           10.56            312         -      Not Applicable
  04/23/2026 02 AM PDT           10.55            309         -      Not Applicable
  04/23/2026 03 AM PDT           10.54            307         -      Not Applicable
  04/23/2026 04 AM PDT           10.53            305         -      Not Applicable
  04/23/2026 05 AM PDT           10.52            303         -      Not Applicable
  04/23/2026 06 AM PDT           10.51            301         -      Not Applicable
  04/23/2026 07 AM PDT           10.49            297         -      Not Applicable
  04/23/2026 08 AM PDT           10.48            295         -      Not Applicable
  04/23/2026 09 AM PDT           10.47            293         -      Not Applicable
  04/23/2026 10 AM PDT           10.46            291         -      Not Applicable
  04/23/2026 11 AM PDT           10.45            288         -      Not Applicable
  04/23/2026 12 PM PDT           10.44            286         -      Not Applicable
  04/23/2026 01 PM PDT           10.43            284         -      Not Applicable
  04/23/2026 02 PM PDT           10.42            282         -      Not Applicable
  04/23/2026 03 PM PDT           10.41            280         -      Not Applicable
  04/23/2026 04 PM PDT           10.40            278         -      Not Applicable
  04/23/2026 05 PM PDT           10.39            276         -      Not Applicable
  04/23/2026 06 PM PDT           10.38            274         -      Not Applicable
  04/23/2026 07 PM PDT           10.37            272         -      Not Applicable
  04/23/2026 08 PM PDT           10.36            270         -      Not Applicable
  04/23/2026 09 PM PDT           10.36            270         0      Not Applicable
  04/23/2026 10 PM PDT           10.35            268         -      Not Applicable
  04/23/2026 11 PM PDT           10.34            266         -      Not Applicable
  04/24/2026 12 AM PDT           10.33            264         -      Not Applicable
  04/24/2026 01 AM PDT           10.32            262         -      Not Applicable
  04/24/2026 02 AM PDT           10.31            260         -      Not Applicable
  04/24/2026 03 AM PDT           10.30            258         -      Not Applicable
  04/24/2026 04 AM PDT           10.29            256         -      Not Applicable
  04/24/2026 05 AM PDT           10.29            256         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.