MATTOLE RIVER - PETROLIA (MTOC1)
Latitude: 40.31º NLongitude: 124.28º WElevation: 40 FeetForecast Type: Unofficial Location
Location: Humboldt County in CaliforniaBulletin Group: North CoastRiver Group: North Coast
Issuance Time: Apr 09 2026 at 12:57 PM PDTNext Issuance: Apr 10 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 - Petrolia (MTOC1)
#
# File Generation Time:  04/09/2026 at 01:01 PM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  04/04/2026 at 04:00 PM PDT
# Maximum Observed Stage:                       12.27 Feet
# Maximum Observed Flow:                        372 cfs
#
# Earliest Date & Time of Maximum Forecast:     04/12/2026 at 01:00 AM PDT
# Maximum Forecast Stage:                       14.42 Feet
# Maximum Forecast Flow:                        2783 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  04/04/2026 01 PM PDT           12.27            372                Not Applicable
  04/04/2026 02 PM PDT           12.27            372         0      Not Applicable
  04/04/2026 03 PM PDT           12.27            372         0      Not Applicable
  04/04/2026 04 PM PDT           12.27            372         0      Not Applicable
  04/04/2026 05 PM PDT           12.26            364         -      Not Applicable
  04/04/2026 06 PM PDT           12.26            364         0      Not Applicable
  04/04/2026 07 PM PDT           12.26            364         0      Not Applicable
  04/04/2026 08 PM PDT           12.25            355         -      Not Applicable
  04/04/2026 09 PM PDT           12.25            355         0      Not Applicable
  04/04/2026 10 PM PDT           12.25            355         0      Not Applicable
  04/04/2026 11 PM PDT           12.24            346         -      Not Applicable
  04/05/2026 12 AM PDT           12.24            346         0      Not Applicable
  04/05/2026 01 AM PDT           12.24            346         0      Not Applicable
  04/05/2026 02 AM PDT           12.24            346         0      Not Applicable
  04/05/2026 03 AM PDT           12.23            338         -      Not Applicable
  04/05/2026 04 AM PDT           12.23            338         0      Not Applicable
  04/05/2026 05 AM PDT           12.22            330         -      Not Applicable
  04/05/2026 06 AM PDT           12.23            338         +      Not Applicable
  04/05/2026 07 AM PDT           12.22            330         -      Not Applicable
  04/05/2026 08 AM PDT           12.23            338         +      Not Applicable
  04/05/2026 09 AM PDT           12.22            330         -      Not Applicable
  04/05/2026 10 AM PDT           12.22            330         0      Not Applicable
  04/05/2026 11 AM PDT           12.22            330         0      Not Applicable
  04/05/2026 12 PM PDT           12.22            330         0      Not Applicable
  04/05/2026 01 PM PDT           12.22            330         0      Not Applicable
  04/05/2026 02 PM PDT           12.22            330         0      Not Applicable
  04/05/2026 03 PM PDT           12.22            330         0      Not Applicable
  04/05/2026 04 PM PDT           12.22            330         0      Not Applicable
  04/05/2026 05 PM PDT           12.22            330         0      Not Applicable
  04/05/2026 06 PM PDT           12.21            322         -      Not Applicable
  04/05/2026 07 PM PDT           12.21            322         0      Not Applicable
  04/05/2026 08 PM PDT           12.21            322         0      Not Applicable
  04/05/2026 09 PM PDT           12.20            314         -      Not Applicable
  04/05/2026 10 PM PDT           12.20            314         0      Not Applicable
  04/05/2026 11 PM PDT           12.20            314         0      Not Applicable
  04/06/2026 12 AM PDT           12.20            314         0      Not Applicable
  04/06/2026 01 AM PDT           12.20            314         0      Not Applicable
  04/06/2026 02 AM PDT           12.19            306         -      Not Applicable
  04/06/2026 03 AM PDT           12.19            306         0      Not Applicable
  04/06/2026 04 AM PDT           12.19            306         0      Not Applicable
  04/06/2026 05 AM PDT           12.19            306         0      Not Applicable
  04/06/2026 06 AM PDT           12.19            306         0      Not Applicable
  04/06/2026 07 AM PDT           12.18            298         -      Not Applicable
  04/06/2026 08 AM PDT           12.18            298         0      Not Applicable
  04/06/2026 09 AM PDT           12.18            298         0      Not Applicable
  04/06/2026 10 AM PDT           12.19            306         +      Not Applicable
  04/06/2026 11 AM PDT           12.18            298         -      Not Applicable
  04/06/2026 12 PM PDT           12.18            298         0      Not Applicable
  04/06/2026 01 PM PDT           12.19            306         +      Not Applicable
  04/06/2026 02 PM PDT           12.18            298         -      Not Applicable
  04/06/2026 03 PM PDT           12.18            298         0      Not Applicable
  04/06/2026 04 PM PDT           12.18            298         0      Not Applicable
  04/06/2026 05 PM PDT           12.18            298         0      Not Applicable
  04/06/2026 06 PM PDT           12.18            298         0      Not Applicable
  04/06/2026 07 PM PDT           12.18            298         0      Not Applicable
  04/06/2026 08 PM PDT           12.17            291         -      Not Applicable
  04/06/2026 09 PM PDT           12.17            291         0      Not Applicable
  04/06/2026 10 PM PDT           12.17            291         0      Not Applicable
  04/06/2026 11 PM PDT           12.17            291         0      Not Applicable
  04/07/2026 12 AM PDT           12.17            291         0      Not Applicable
  04/07/2026 01 AM PDT           12.17            291         0      Not Applicable
  04/07/2026 02 AM PDT           12.17            291         0      Not Applicable
  04/07/2026 03 AM PDT           12.17            291         0      Not Applicable
  04/07/2026 04 AM PDT           12.17            291         0      Not Applicable
  04/07/2026 05 AM PDT           12.16            283         -      Not Applicable
  04/07/2026 06 AM PDT           12.16            283         0      Not Applicable
  04/07/2026 07 AM PDT           12.16            283         0      Not Applicable
  04/07/2026 08 AM PDT           12.16            283         0      Not Applicable
  04/07/2026 09 AM PDT           12.16            283         0      Not Applicable
  04/07/2026 10 AM PDT           12.16            283         0      Not Applicable
  04/07/2026 11 AM PDT           12.16            283         0      Not Applicable
  04/07/2026 12 PM PDT           12.16            283         0      Not Applicable
  04/07/2026 01 PM PDT           12.16            283         0      Not Applicable
  04/07/2026 02 PM PDT           12.16            283         0      Not Applicable
  04/07/2026 03 PM PDT           12.16            283         0      Not Applicable
  04/07/2026 04 PM PDT           12.16            283         0      Not Applicable
  04/07/2026 05 PM PDT           12.15            276         -      Not Applicable
  04/07/2026 06 PM PDT           12.16            283         +      Not Applicable
  04/07/2026 07 PM PDT           12.15            276         -      Not Applicable
  04/07/2026 08 PM PDT           12.15            276         0      Not Applicable
  04/07/2026 09 PM PDT           12.15            276         0      Not Applicable
  04/07/2026 10 PM PDT           12.15            276         0      Not Applicable
  04/07/2026 11 PM PDT           12.15            276         0      Not Applicable
  04/08/2026 12 AM PDT           12.14            269         -      Not Applicable
  04/08/2026 01 AM PDT           12.15            276         +      Not Applicable
  04/08/2026 02 AM PDT           12.14            269         -      Not Applicable
  04/08/2026 03 AM PDT           12.14            269         0      Not Applicable
  04/08/2026 04 AM PDT           12.14            269         0      Not Applicable
  04/08/2026 05 AM PDT           12.14            269         0      Not Applicable
  04/08/2026 06 AM PDT           12.14            269         0      Not Applicable
  04/08/2026 07 AM PDT           12.14            269         0      Not Applicable
  04/08/2026 08 AM PDT           12.14            269         0      Not Applicable
  04/08/2026 09 AM PDT           12.14            269         0      Not Applicable
  04/08/2026 10 AM PDT           12.14            269         0      Not Applicable
  04/08/2026 11 AM PDT           12.14            269         0      Not Applicable
  04/08/2026 12 PM PDT           12.14            269         0      Not Applicable
  04/08/2026 01 PM PDT           12.14            269         0      Not Applicable
  04/08/2026 02 PM PDT           12.14            269         0      Not Applicable
  04/08/2026 03 PM PDT           12.14            269         0      Not Applicable
  04/08/2026 04 PM PDT           12.14            269         0      Not Applicable
  04/08/2026 05 PM PDT           12.14            269         0      Not Applicable
  04/08/2026 06 PM PDT           12.13            262         -      Not Applicable
  04/08/2026 07 PM PDT           12.13            262         0      Not Applicable
  04/08/2026 08 PM PDT           12.13            262         0      Not Applicable
  04/08/2026 09 PM PDT           12.13            262         0      Not Applicable
  04/08/2026 10 PM PDT           12.13            262         0      Not Applicable
  04/08/2026 11 PM PDT           12.13            262         0      Not Applicable
  04/09/2026 12 AM PDT           12.13            262         0      Not Applicable
  04/09/2026 01 AM PDT           12.13            262         0      Not Applicable
  04/09/2026 02 AM PDT           12.13            262         0      Not Applicable
  04/09/2026 03 AM PDT           12.12            255         -      Not Applicable
  04/09/2026 04 AM PDT           12.12            255         0      Not Applicable
  04/09/2026 05 AM PDT           12.13            262         +      Not Applicable
  04/09/2026 06 AM PDT           12.12            255         -      Not Applicable
  04/09/2026 07 AM PDT           12.13            262         +      Not Applicable
  04/09/2026 08 AM PDT           12.12            255         -      Not Applicable
  04/09/2026 09 AM PDT           12.12            255         0      Not Applicable
  04/09/2026 10 AM PDT           12.12            255         0      Not Applicable
  04/09/2026 11 AM PDT           12.13            262         +      Not Applicable
  04/09/2026 12 PM PDT           12.13            262         0      Not Applicable
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  04/09/2026 01 PM PDT           12.13            262                Not Applicable
  04/09/2026 02 PM PDT           12.13            262         0      Not Applicable
  04/09/2026 03 PM PDT           12.13            262         0      Not Applicable
  04/09/2026 04 PM PDT           12.13            262         0      Not Applicable
  04/09/2026 05 PM PDT           12.13            262         0      Not Applicable
  04/09/2026 06 PM PDT           12.13            262         0      Not Applicable
  04/09/2026 07 PM PDT           12.13            262         0      Not Applicable
  04/09/2026 08 PM PDT           12.13            262         0      Not Applicable
  04/09/2026 09 PM PDT           12.13            262         0      Not Applicable
  04/09/2026 10 PM PDT           12.13            262         0      Not Applicable
  04/09/2026 11 PM PDT           12.13            262         0      Not Applicable
  04/10/2026 12 AM PDT           12.13            262         0      Not Applicable
  04/10/2026 01 AM PDT           12.13            262         0      Not Applicable
  04/10/2026 02 AM PDT           12.13            262         0      Not Applicable
  04/10/2026 03 AM PDT           12.13            262         0      Not Applicable
  04/10/2026 04 AM PDT           12.13            262         0      Not Applicable
  04/10/2026 05 AM PDT           12.13            262         0      Not Applicable
  04/10/2026 06 AM PDT           12.13            262         0      Not Applicable
  04/10/2026 07 AM PDT           12.13            262         0      Not Applicable
  04/10/2026 08 AM PDT           12.13            262         0      Not Applicable
  04/10/2026 09 AM PDT           12.13            262         0      Not Applicable
  04/10/2026 10 AM PDT           12.13            262         0      Not Applicable
  04/10/2026 11 AM PDT           12.13            262         0      Not Applicable
  04/10/2026 12 PM PDT           12.13            262         0      Not Applicable
  04/10/2026 01 PM PDT           12.13            262         0      Not Applicable
  04/10/2026 02 PM PDT           12.13            262         0      Not Applicable
  04/10/2026 03 PM PDT           12.13            262         0      Not Applicable
  04/10/2026 04 PM PDT           12.13            262         0      Not Applicable
  04/10/2026 05 PM PDT           12.13            262         0      Not Applicable
  04/10/2026 06 PM PDT           12.13            262         0      Not Applicable
  04/10/2026 07 PM PDT           12.13            262         0      Not Applicable
  04/10/2026 08 PM PDT           12.13            262         0      Not Applicable
  04/10/2026 09 PM PDT           12.13            262         0      Not Applicable
  04/10/2026 10 PM PDT           12.13            262         0      Not Applicable
  04/10/2026 11 PM PDT           12.13            262         0      Not Applicable
  04/11/2026 12 AM PDT           12.13            262         0      Not Applicable
  04/11/2026 01 AM PDT           12.13            262         0      Not Applicable
  04/11/2026 02 AM PDT           12.13            262         0      Not Applicable
  04/11/2026 03 AM PDT           12.13            262         0      Not Applicable
  04/11/2026 04 AM PDT           12.13            262         0      Not Applicable
  04/11/2026 05 AM PDT           12.13            262         0      Not Applicable
  04/11/2026 06 AM PDT           12.14            269         +      Not Applicable
  04/11/2026 07 AM PDT           12.14            269         0      Not Applicable
  04/11/2026 08 AM PDT           12.14            269         0      Not Applicable
  04/11/2026 09 AM PDT           12.14            269         0      Not Applicable
  04/11/2026 10 AM PDT           12.14            269         0      Not Applicable
  04/11/2026 11 AM PDT           12.14            269         0      Not Applicable
  04/11/2026 12 PM PDT           12.14            269         0      Not Applicable
  04/11/2026 01 PM PDT           12.14            269         0      Not Applicable
  04/11/2026 02 PM PDT           12.15            276         +      Not Applicable
  04/11/2026 03 PM PDT           12.15            276         0      Not Applicable
  04/11/2026 04 PM PDT           12.21            322         +      Not Applicable
  04/11/2026 05 PM PDT           12.35            448         +      Not Applicable
  04/11/2026 06 PM PDT           12.52            621         +      Not Applicable
  04/11/2026 07 PM PDT           12.98           1122         +      Not Applicable
  04/11/2026 08 PM PDT           13.83           2058         +      Not Applicable
  04/11/2026 09 PM PDT           14.07           2338         +      Not Applicable
  04/11/2026 10 PM PDT           14.25           2557         +      Not Applicable
  04/11/2026 11 PM PDT           14.36           2703         +      Not Applicable
  04/12/2026 12 AM PDT           14.41           2770         +      Not Applicable
  04/12/2026 01 AM PDT           14.42           2783         +      Not Applicable
  04/12/2026 02 AM PDT           14.38           2730         -      Not Applicable
  04/12/2026 03 AM PDT           14.33           2663         -      Not Applicable
  04/12/2026 04 AM PDT           14.29           2610         -      Not Applicable
  04/12/2026 05 AM PDT           14.24           2544         -      Not Applicable
  04/12/2026 06 AM PDT           14.19           2480         -      Not Applicable
  04/12/2026 07 AM PDT           14.13           2409         -      Not Applicable
  04/12/2026 08 AM PDT           14.07           2338         -      Not Applicable
  04/12/2026 09 AM PDT           14.01           2267         -      Not Applicable
  04/12/2026 10 AM PDT           13.96           2209         -      Not Applicable
  04/12/2026 11 AM PDT           13.90           2139         -      Not Applicable
  04/12/2026 12 PM PDT           13.85           2081         -      Not Applicable
  04/12/2026 01 PM PDT           13.80           2023         -      Not Applicable
  04/12/2026 02 PM PDT           13.76           1977         -      Not Applicable
  04/12/2026 03 PM PDT           13.72           1932         -      Not Applicable
  04/12/2026 04 PM PDT           13.69           1898         -      Not Applicable
  04/12/2026 05 PM PDT           13.65           1852         -      Not Applicable
  04/12/2026 06 PM PDT           13.62           1818         -      Not Applicable
  04/12/2026 07 PM PDT           13.58           1773         -      Not Applicable
  04/12/2026 08 PM PDT           13.55           1740         -      Not Applicable
  04/12/2026 09 PM PDT           13.51           1695         -      Not Applicable
  04/12/2026 10 PM PDT           13.48           1662         -      Not Applicable
  04/12/2026 11 PM PDT           13.44           1617         -      Not Applicable
  04/13/2026 12 AM PDT           13.40           1573         -      Not Applicable
  04/13/2026 01 AM PDT           13.36           1529         -      Not Applicable
  04/13/2026 02 AM PDT           13.32           1486         -      Not Applicable
  04/13/2026 03 AM PDT           13.27           1431         -      Not Applicable
  04/13/2026 04 AM PDT           13.22           1377         -      Not Applicable
  04/13/2026 05 AM PDT           13.18           1335         -      Not Applicable
  04/13/2026 06 AM PDT           13.13           1281         -      Not Applicable
  04/13/2026 07 AM PDT           13.10           1250         -      Not Applicable
  04/13/2026 08 AM PDT           13.06           1207         -      Not Applicable
  04/13/2026 09 AM PDT           13.03           1176         -      Not Applicable
  04/13/2026 10 AM PDT           13.00           1145         -      Not Applicable
  04/13/2026 11 AM PDT           12.97           1110         -      Not Applicable
  04/13/2026 12 PM PDT           12.96           1099         -      Not Applicable
  04/13/2026 01 PM PDT           12.94           1076         -      Not Applicable
  04/13/2026 02 PM PDT           12.93           1065         -      Not Applicable
  04/13/2026 03 PM PDT           12.91           1042         -      Not Applicable
  04/13/2026 04 PM PDT           12.89           1020         -      Not Applicable
  04/13/2026 05 PM PDT           12.87            998         -      Not Applicable
  04/13/2026 06 PM PDT           12.85            975         -      Not Applicable
  04/13/2026 07 PM PDT           12.84            964         -      Not Applicable
  04/13/2026 08 PM PDT           12.82            942         -      Not Applicable
  04/13/2026 09 PM PDT           12.80            920         -      Not Applicable
  04/13/2026 10 PM PDT           12.79            909         -      Not Applicable
  04/13/2026 11 PM PDT           12.77            887         -      Not Applicable
  04/14/2026 12 AM PDT           12.76            876         -      Not Applicable
  04/14/2026 01 AM PDT           12.75            865         -      Not Applicable
  04/14/2026 02 AM PDT           12.73            843         -      Not Applicable
  04/14/2026 03 AM PDT           12.72            832         -      Not Applicable
  04/14/2026 04 AM PDT           12.71            821         -      Not Applicable
  04/14/2026 05 AM PDT           12.71            821         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.