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: Feb 27 2026 at 1:31 PM PSTNext Issuance: Feb 28 2026 at 9:00 AM PST
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:  02/27/2026 at 01:33 PM PST
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  02/24/2026 at 01:00 PM PST
# Maximum Observed Stage:                       25.03 Feet
# Maximum Observed Flow:                        13961 cfs
#
# Earliest Date & Time of Maximum Forecast:     02/27/2026 at 02:00 PM PST
# Maximum Forecast Stage:                       12.38 Feet
# Maximum Forecast Flow:                        956 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  02/22/2026 01 PM PST           11.19            467                Not Applicable
  02/22/2026 02 PM PST           11.17            460         -      Not Applicable
  02/22/2026 03 PM PST           11.15            453         -      Not Applicable
  02/22/2026 04 PM PST           11.14            450         -      Not Applicable
  02/22/2026 05 PM PST           11.12            443         -      Not Applicable
  02/22/2026 06 PM PST           11.12            443         0      Not Applicable
  02/22/2026 07 PM PST           11.10            436         -      Not Applicable
  02/22/2026 08 PM PST           11.09            434         -      Not Applicable
  02/22/2026 09 PM PST           11.09            434         0      Not Applicable
  02/22/2026 10 PM PST           11.08            431         -      Not Applicable
  02/22/2026 11 PM PST           11.08            431         0      Not Applicable
  02/23/2026 12 AM PST           11.09            434         +      Not Applicable
  02/23/2026 01 AM PST           11.09            434         0      Not Applicable
  02/23/2026 02 AM PST           11.10            436         +      Not Applicable
  02/23/2026 03 AM PST           11.09            434         -      Not Applicable
  02/23/2026 04 AM PST           11.09            434         0      Not Applicable
  02/23/2026 05 AM PST           11.09            434         0      Not Applicable
  02/23/2026 06 AM PST           11.08            431         -      Not Applicable
  02/23/2026 07 AM PST           11.08            431         0      Not Applicable
  02/23/2026 08 AM PST           11.08            431         0      Not Applicable
  02/23/2026 09 AM PST           11.07            429         -      Not Applicable
  02/23/2026 10 AM PST           11.08            431         +      Not Applicable
  02/23/2026 11 AM PST           11.06            426         -      Not Applicable
  02/23/2026 12 PM PST           11.05            423         -      Not Applicable
  02/23/2026 01 PM PST           11.05            423         0      Not Applicable
  02/23/2026 02 PM PST           11.05            423         0      Not Applicable
  02/23/2026 03 PM PST           11.04            421         -      Not Applicable
  02/23/2026 04 PM PST           11.03            418         -      Not Applicable
  02/23/2026 05 PM PST           11.03            418         0      Not Applicable
  02/23/2026 06 PM PST           11.04            421         +      Not Applicable
  02/23/2026 07 PM PST           11.05            423         +      Not Applicable
  02/23/2026 08 PM PST           11.09            434         +      Not Applicable
  02/23/2026 09 PM PST           11.17            460         +      Not Applicable
  02/23/2026 10 PM PST           11.33            517         +      Not Applicable
  02/23/2026 11 PM PST           11.69            654         +      Not Applicable
  02/24/2026 12 AM PST           12.50           1014         +      Not Applicable
  02/24/2026 01 AM PST           13.65           1638         +      Not Applicable
  02/24/2026 02 AM PST           14.68           2306         +      Not Applicable
  02/24/2026 03 AM PST           15.86           3189         +      Not Applicable
  02/24/2026 04 AM PST           17.29           4423         +      Not Applicable
  02/24/2026 05 AM PST           18.91           6030         +      Not Applicable
  02/24/2026 06 AM PST           20.58           7908         +      Not Applicable
  02/24/2026 07 AM PST           21.69           9278         +      Not Applicable
  02/24/2026 08 AM PST           22.80          10742         +      Not Applicable
  02/24/2026 09 AM PST           23.66          11940         +      Not Applicable
  02/24/2026 10 AM PST           24.38          12985         +      Not Applicable
  02/24/2026 11 AM PST           24.70          13462         +      Not Applicable
  02/24/2026 12 PM PST           24.94          13824         +      Not Applicable
  02/24/2026 01 PM PST           25.03          13961         +      Not Applicable
  02/24/2026 02 PM PST           24.88          13733         -      Not Applicable
  02/24/2026 03 PM PST           24.63          13357         -      Not Applicable
  02/24/2026 04 PM PST           24.36          12955         -      Not Applicable
  02/24/2026 05 PM PST           24.03          12472         -      Not Applicable
  02/24/2026 06 PM PST           23.73          12040         -      Not Applicable
  02/24/2026 07 PM PST           23.31          11445         -      Not Applicable
  02/24/2026 08 PM PST           22.79          10728         -      Not Applicable
  02/24/2026 09 PM PST           22.32          10097         -      Not Applicable
  02/24/2026 10 PM PST           21.75           9354         -      Not Applicable
  02/24/2026 11 PM PST           21.19           8649         -      Not Applicable
  02/25/2026 12 AM PST           20.56           7884         -      Not Applicable
  02/25/2026 01 AM PST           20.03           7265         -      Not Applicable
  02/25/2026 02 AM PST           19.39           6547         -      Not Applicable
  02/25/2026 03 AM PST           18.82           5935         -      Not Applicable
  02/25/2026 04 AM PST           18.39           5491         -      Not Applicable
  02/25/2026 05 AM PST           18.00           5101         -      Not Applicable
  02/25/2026 06 AM PST           17.64           4752         -      Not Applicable
  02/25/2026 07 AM PST           17.25           4387         -      Not Applicable
  02/25/2026 08 AM PST           16.99           4150         -      Not Applicable
  02/25/2026 09 AM PST           16.71           3902         -      Not Applicable
  02/25/2026 10 AM PST           16.45           3677         -      Not Applicable
  02/25/2026 11 AM PST           16.22           3483         -      Not Applicable
  02/25/2026 12 PM PST           16.05           3343         -      Not Applicable
  02/25/2026 01 PM PST           15.84           3173         -      Not Applicable
  02/25/2026 02 PM PST           15.76           3109         -      Not Applicable
  02/25/2026 03 PM PST           15.56           2953         -      Not Applicable
  02/25/2026 04 PM PST           15.40           2830         -      Not Applicable
  02/25/2026 05 PM PST           15.36           2800         -      Not Applicable
  02/25/2026 06 PM PST           15.21           2687         -      Not Applicable
  02/25/2026 07 PM PST           15.11           2613         -      Not Applicable
  02/25/2026 08 PM PST           14.87           2439         -      Not Applicable
  02/25/2026 09 PM PST           14.75           2355         -      Not Applicable
  02/25/2026 10 PM PST           14.66           2292         -      Not Applicable
  02/25/2026 11 PM PST           14.57           2230         -      Not Applicable
  02/26/2026 12 AM PST           14.42           2128         -      Not Applicable
  02/26/2026 01 AM PST           14.39           2108         -      Not Applicable
  02/26/2026 02 AM PST           14.30           2048         -      Not Applicable
  02/26/2026 03 AM PST           14.19           1976         -      Not Applicable
  02/26/2026 04 AM PST           14.08           1905         -      Not Applicable
  02/26/2026 05 AM PST           14.14           1943         +      Not Applicable
  02/26/2026 06 AM PST           13.95           1823         -      Not Applicable
  02/26/2026 07 AM PST           13.78           1717         -      Not Applicable
  02/26/2026 08 AM PST           13.82           1742         +      Not Applicable
  02/26/2026 09 AM PST           13.77           1711         -      Not Applicable
  02/26/2026 10 AM PST           13.70           1669         -      Not Applicable
  02/26/2026 11 AM PST           13.58           1597         -      Not Applicable
  02/26/2026 12 PM PST           13.48           1538         -      Not Applicable
  02/26/2026 01 PM PST           13.51           1556         +      Not Applicable
  02/26/2026 02 PM PST           13.42           1503         -      Not Applicable
  02/26/2026 03 PM PST           13.30           1435         -      Not Applicable
  02/26/2026 04 PM PST           13.25           1406         -      Not Applicable
  02/26/2026 05 PM PST           13.15           1351         -      Not Applicable
  02/26/2026 06 PM PST           13.09           1318         -      Not Applicable
  02/26/2026 07 PM PST           13.02           1280         -      Not Applicable
  02/26/2026 08 PM PST           12.98           1259         -      Not Applicable
  02/26/2026 09 PM PST           12.92           1227         -      Not Applicable
  02/26/2026 10 PM PST           12.87           1201         -      Not Applicable
  02/26/2026 11 PM PST           12.84           1185         -      Not Applicable
  02/27/2026 12 AM PST           12.86           1195         +      Not Applicable
  02/27/2026 01 AM PST           12.81           1169         -      Not Applicable
  02/27/2026 02 AM PST           12.73           1128         -      Not Applicable
  02/27/2026 03 AM PST           12.68           1103         -      Not Applicable
  02/27/2026 04 AM PST           12.65           1088         -      Not Applicable
  02/27/2026 05 AM PST           12.62           1073         -      Not Applicable
  02/27/2026 06 AM PST           12.57           1048         -      Not Applicable
  02/27/2026 07 AM PST           12.54           1033         -      Not Applicable
  02/27/2026 08 AM PST           12.49           1009         -      Not Applicable
  02/27/2026 09 AM PST           12.46            994         -      Not Applicable
  02/27/2026 10 AM PST           12.43            980         -      Not Applicable
  02/27/2026 11 AM PST           12.41            970         -      Not Applicable
  02/27/2026 12 PM PST           12.40            966         -      Not Applicable
  02/27/2026 01 PM PST           12.39            961         -      Not Applicable
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  02/27/2026 02 PM PST           12.38            956                Not Applicable
  02/27/2026 03 PM PST           12.38            956         0      Not Applicable
  02/27/2026 04 PM PST           12.37            951         -      Not Applicable
  02/27/2026 05 PM PST           12.36            947         -      Not Applicable
  02/27/2026 06 PM PST           12.36            947         0      Not Applicable
  02/27/2026 07 PM PST           12.35            942         -      Not Applicable
  02/27/2026 08 PM PST           12.35            942         0      Not Applicable
  02/27/2026 09 PM PST           12.34            937         -      Not Applicable
  02/27/2026 10 PM PST           12.34            937         0      Not Applicable
  02/27/2026 11 PM PST           12.34            937         0      Not Applicable
  02/28/2026 12 AM PST           12.33            933         -      Not Applicable
  02/28/2026 01 AM PST           12.33            933         0      Not Applicable
  02/28/2026 02 AM PST           12.34            937         +      Not Applicable
  02/28/2026 03 AM PST           12.34            937         0      Not Applicable
  02/28/2026 04 AM PST           12.34            937         0      Not Applicable
  02/28/2026 05 AM PST           12.34            937         0      Not Applicable
  02/28/2026 06 AM PST           12.34            937         0      Not Applicable
  02/28/2026 07 AM PST           12.34            937         0      Not Applicable
  02/28/2026 08 AM PST           12.34            937         0      Not Applicable
  02/28/2026 09 AM PST           12.34            937         0      Not Applicable
  02/28/2026 10 AM PST           12.34            937         0      Not Applicable
  02/28/2026 11 AM PST           12.34            937         0      Not Applicable
  02/28/2026 12 PM PST           12.32            928         -      Not Applicable
  02/28/2026 01 PM PST           12.31            923         -      Not Applicable
  02/28/2026 02 PM PST           12.29            914         -      Not Applicable
  02/28/2026 03 PM PST           12.28            909         -      Not Applicable
  02/28/2026 04 PM PST           12.26            900         -      Not Applicable
  02/28/2026 05 PM PST           12.25            895         -      Not Applicable
  02/28/2026 06 PM PST           12.23            886         -      Not Applicable
  02/28/2026 07 PM PST           12.22            882         -      Not Applicable
  02/28/2026 08 PM PST           12.20            873         -      Not Applicable
  02/28/2026 09 PM PST           12.19            868         -      Not Applicable
  02/28/2026 10 PM PST           12.17            859         -      Not Applicable
  02/28/2026 11 PM PST           12.16            854         -      Not Applicable
  03/01/2026 12 AM PST           12.14            845         -      Not Applicable
  03/01/2026 01 AM PST           12.13            841         -      Not Applicable
  03/01/2026 02 AM PST           12.11            832         -      Not Applicable
  03/01/2026 03 AM PST           12.10            828         -      Not Applicable
  03/01/2026 04 AM PST           12.08            819         -      Not Applicable
  03/01/2026 05 AM PST           12.07            814         -      Not Applicable
  03/01/2026 06 AM PST           12.05            805         -      Not Applicable
  03/01/2026 07 AM PST           12.04            801         -      Not Applicable
  03/01/2026 08 AM PST           12.03            797         -      Not Applicable
  03/01/2026 09 AM PST           12.01            788         -      Not Applicable
  03/01/2026 10 AM PST           12.00            784         -      Not Applicable
  03/01/2026 11 AM PST           11.98            775         -      Not Applicable
  03/01/2026 12 PM PST           11.97            771         -      Not Applicable
  03/01/2026 01 PM PST           11.96            766         -      Not Applicable
  03/01/2026 02 PM PST           11.94            758         -      Not Applicable
  03/01/2026 03 PM PST           11.93            753         -      Not Applicable
  03/01/2026 04 PM PST           11.92            749         -      Not Applicable
  03/01/2026 05 PM PST           11.90            741         -      Not Applicable
  03/01/2026 06 PM PST           11.89            736         -      Not Applicable
  03/01/2026 07 PM PST           11.88            732         -      Not Applicable
  03/01/2026 08 PM PST           11.87            728         -      Not Applicable
  03/01/2026 09 PM PST           11.85            720         -      Not Applicable
  03/01/2026 10 PM PST           11.84            715         -      Not Applicable
  03/01/2026 11 PM PST           11.83            711         -      Not Applicable
  03/02/2026 12 AM PST           11.81            703         -      Not Applicable
  03/02/2026 01 AM PST           11.80            699         -      Not Applicable
  03/02/2026 02 AM PST           11.79            695         -      Not Applicable
  03/02/2026 03 AM PST           11.78            691         -      Not Applicable
  03/02/2026 04 AM PST           11.77            687         -      Not Applicable
  03/02/2026 05 AM PST           11.75            678         -      Not Applicable
  03/02/2026 06 AM PST           11.74            674         -      Not Applicable
  03/02/2026 07 AM PST           11.73            670         -      Not Applicable
  03/02/2026 08 AM PST           11.71            662         -      Not Applicable
  03/02/2026 09 AM PST           11.70            658         -      Not Applicable
  03/02/2026 10 AM PST           11.69            654         -      Not Applicable
  03/02/2026 11 AM PST           11.68            650         -      Not Applicable
  03/02/2026 12 PM PST           11.66            642         -      Not Applicable
  03/02/2026 01 PM PST           11.65            638         -      Not Applicable
  03/02/2026 02 PM PST           11.64            634         -      Not Applicable
  03/02/2026 03 PM PST           11.63            630         -      Not Applicable
  03/02/2026 04 PM PST           11.61            622         -      Not Applicable
  03/02/2026 05 PM PST           11.60            618         -      Not Applicable
  03/02/2026 06 PM PST           11.59            614         -      Not Applicable
  03/02/2026 07 PM PST           11.58            611         -      Not Applicable
  03/02/2026 08 PM PST           11.57            607         -      Not Applicable
  03/02/2026 09 PM PST           11.56            603         -      Not Applicable
  03/02/2026 10 PM PST           11.54            595         -      Not Applicable
  03/02/2026 11 PM PST           11.53            591         -      Not Applicable
  03/03/2026 12 AM PST           11.52            587         -      Not Applicable
  03/03/2026 01 AM PST           11.51            584         -      Not Applicable
  03/03/2026 02 AM PST           11.50            580         -      Not Applicable
  03/03/2026 03 AM PST           11.49            576         -      Not Applicable
  03/03/2026 04 AM PST           11.48            572         -      Not Applicable
  03/03/2026 05 AM PST           11.47            568         -      Not Applicable
  03/03/2026 06 AM PST           11.46            565         -      Not Applicable
  03/03/2026 07 AM PST           11.45            561         -      Not Applicable
  03/03/2026 08 AM PST           11.43            553         -      Not Applicable
  03/03/2026 09 AM PST           11.42            550         -      Not Applicable
  03/03/2026 10 AM PST           11.41            546         -      Not Applicable
  03/03/2026 11 AM PST           11.40            542         -      Not Applicable
  03/03/2026 12 PM PST           11.39            538         -      Not Applicable
  03/03/2026 01 PM PST           11.38            535         -      Not Applicable
  03/03/2026 02 PM PST           11.37            531         -      Not Applicable
  03/03/2026 03 PM PST           11.36            527         -      Not Applicable
  03/03/2026 04 PM PST           11.35            524         -      Not Applicable
  03/03/2026 05 PM PST           11.34            520         -      Not Applicable
  03/03/2026 06 PM PST           11.33            517         -      Not Applicable
  03/03/2026 07 PM PST           11.32            513         -      Not Applicable
  03/03/2026 08 PM PST           11.31            509         -      Not Applicable
  03/03/2026 09 PM PST           11.30            506         -      Not Applicable
  03/03/2026 10 PM PST           11.29            502         -      Not Applicable
  03/03/2026 11 PM PST           11.28            499         -      Not Applicable
  03/04/2026 12 AM PST           11.28            499         0      Not Applicable
  03/04/2026 01 AM PST           11.27            495         -      Not Applicable
  03/04/2026 02 AM PST           11.26            491         -      Not Applicable
  03/04/2026 03 AM PST           11.25            488         -      Not Applicable
  03/04/2026 04 AM PST           11.24            484         -      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.