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 11 2026 at 8:35 AM PDTNext Issuance: Apr 12 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:  04/11/2026 at 08:38 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  04/06/2026 at 01:00 PM PDT
# Maximum Observed Stage:                       12.19 Feet
# Maximum Observed Flow:                        306 cfs
#
# Earliest Date & Time of Maximum Forecast:     04/12/2026 at 06:00 AM PDT
# Maximum Forecast Stage:                       13.37 Feet
# Maximum Forecast Flow:                        1540 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  04/06/2026 08 AM PDT           12.18            298                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           12.12            255         -      Not Applicable
  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           12.12            255         -      Not Applicable
  04/09/2026 05 PM PDT           12.12            255         0      Not Applicable
  04/09/2026 06 PM PDT           12.12            255         0      Not Applicable
  04/09/2026 07 PM PDT           12.12            255         0      Not Applicable
  04/09/2026 08 PM PDT           12.12            255         0      Not Applicable
  04/09/2026 09 PM PDT           12.12            255         0      Not Applicable
  04/09/2026 10 PM PDT           12.12            255         0      Not Applicable
  04/09/2026 11 PM PDT           12.12            255         0      Not Applicable
  04/10/2026 12 AM PDT           12.12            255         0      Not Applicable
  04/10/2026 01 AM PDT           12.12            255         0      Not Applicable
  04/10/2026 02 AM PDT           12.12            255         0      Not Applicable
  04/10/2026 03 AM PDT           12.12            255         0      Not Applicable
  04/10/2026 04 AM PDT           12.12            255         0      Not Applicable
  04/10/2026 05 AM PDT           12.11            248         -      Not Applicable
  04/10/2026 06 AM PDT           12.12            255         +      Not Applicable
  04/10/2026 07 AM PDT           12.11            248         -      Not Applicable
  04/10/2026 08 AM PDT           12.12            255         +      Not Applicable
  04/10/2026 09 AM PDT           12.12            255         0      Not Applicable
  04/10/2026 10 AM PDT           12.12            255         0      Not Applicable
  04/10/2026 11 AM PDT           12.12            255         0      Not Applicable
  04/10/2026 12 PM PDT           12.12            255         0      Not Applicable
  04/10/2026 01 PM PDT           12.12            255         0      Not Applicable
  04/10/2026 02 PM PDT           12.12            255         0      Not Applicable
  04/10/2026 03 PM PDT           12.12            255         0      Not Applicable
  04/10/2026 04 PM PDT           12.12            255         0      Not Applicable
  04/10/2026 05 PM PDT           12.12            255         0      Not Applicable
  04/10/2026 06 PM PDT           12.12            255         0      Not Applicable
  04/10/2026 07 PM PDT           12.12            255         0      Not Applicable
  04/10/2026 08 PM PDT           12.12            255         0      Not Applicable
  04/10/2026 09 PM PDT           12.12            255         0      Not Applicable
  04/10/2026 10 PM PDT           12.14            269         +      Not Applicable
  04/10/2026 11 PM PDT           12.15            276         +      Not Applicable
  04/11/2026 12 AM PDT           12.15            276         0      Not Applicable
  04/11/2026 01 AM PDT           12.15            276         0      Not Applicable
  04/11/2026 02 AM PDT           12.16            283         +      Not Applicable
  04/11/2026 03 AM PDT           12.16            283         0      Not Applicable
  04/11/2026 04 AM PDT           12.17            291         +      Not Applicable
  04/11/2026 05 AM PDT           12.16            283         -      Not Applicable
  04/11/2026 06 AM PDT           12.16            283         0      Not Applicable
  04/11/2026 07 AM PDT           12.17            291         +      Not Applicable
  04/11/2026 08 AM PDT           12.17            291         0      Not Applicable
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  04/11/2026 09 AM PDT           12.17            291                Not Applicable
  04/11/2026 10 AM PDT           12.17            291         0      Not Applicable
  04/11/2026 11 AM PDT           12.17            291         0      Not Applicable
  04/11/2026 12 PM PDT           12.18            298         +      Not Applicable
  04/11/2026 01 PM PDT           12.18            298         0      Not Applicable
  04/11/2026 02 PM PDT           12.18            298         0      Not Applicable
  04/11/2026 03 PM PDT           12.19            306         +      Not Applicable
  04/11/2026 04 PM PDT           12.19            306         0      Not Applicable
  04/11/2026 05 PM PDT           12.20            314         +      Not Applicable
  04/11/2026 06 PM PDT           12.22            330         +      Not Applicable
  04/11/2026 07 PM PDT           12.23            338         +      Not Applicable
  04/11/2026 08 PM PDT           12.26            364         +      Not Applicable
  04/11/2026 09 PM PDT           12.29            390         +      Not Applicable
  04/11/2026 10 PM PDT           12.38            479         +      Not Applicable
  04/11/2026 11 PM PDT           12.50            600         +      Not Applicable
  04/12/2026 12 AM PDT           12.65            757         +      Not Applicable
  04/12/2026 01 AM PDT           12.84            964         +      Not Applicable
  04/12/2026 02 AM PDT           13.05           1197         +      Not Applicable
  04/12/2026 03 AM PDT           13.31           1475         +      Not Applicable
  04/12/2026 04 AM PDT           13.34           1507         +      Not Applicable
  04/12/2026 05 AM PDT           13.36           1529         +      Not Applicable
  04/12/2026 06 AM PDT           13.37           1540         +      Not Applicable
  04/12/2026 07 AM PDT           13.37           1540         0      Not Applicable
  04/12/2026 08 AM PDT           13.35           1518         -      Not Applicable
  04/12/2026 09 AM PDT           13.32           1486         -      Not Applicable
  04/12/2026 10 AM PDT           13.30           1464         -      Not Applicable
  04/12/2026 11 AM PDT           13.28           1442         -      Not Applicable
  04/12/2026 12 PM PDT           13.25           1410         -      Not Applicable
  04/12/2026 01 PM PDT           13.21           1367         -      Not Applicable
  04/12/2026 02 PM PDT           13.18           1335         -      Not Applicable
  04/12/2026 03 PM PDT           13.14           1292         -      Not Applicable
  04/12/2026 04 PM PDT           13.10           1250         -      Not Applicable
  04/12/2026 05 PM PDT           13.07           1218         -      Not Applicable
  04/12/2026 06 PM PDT           13.04           1186         -      Not Applicable
  04/12/2026 07 PM PDT           13.02           1166         -      Not Applicable
  04/12/2026 08 PM PDT           12.99           1133         -      Not Applicable
  04/12/2026 09 PM PDT           12.96           1099         -      Not Applicable
  04/12/2026 10 PM PDT           12.93           1065         -      Not Applicable
  04/12/2026 11 PM PDT           12.89           1020         -      Not Applicable
  04/13/2026 12 AM PDT           12.86            986         -      Not Applicable
  04/13/2026 01 AM PDT           12.83            953         -      Not Applicable
  04/13/2026 02 AM PDT           12.80            920         -      Not Applicable
  04/13/2026 03 AM PDT           12.77            887         -      Not Applicable
  04/13/2026 04 AM PDT           12.75            865         -      Not Applicable
  04/13/2026 05 AM PDT           12.72            832         -      Not Applicable
  04/13/2026 06 AM PDT           12.71            821         -      Not Applicable
  04/13/2026 07 AM PDT           12.69            800         -      Not Applicable
  04/13/2026 08 AM PDT           12.68            789         -      Not Applicable
  04/13/2026 09 AM PDT           12.66            768         -      Not Applicable
  04/13/2026 10 AM PDT           12.64            746         -      Not Applicable
  04/13/2026 11 AM PDT           12.63            736         -      Not Applicable
  04/13/2026 12 PM PDT           12.61            715         -      Not Applicable
  04/13/2026 01 PM PDT           12.60            704         -      Not Applicable
  04/13/2026 02 PM PDT           12.59            694         -      Not Applicable
  04/13/2026 03 PM PDT           12.57            673         -      Not Applicable
  04/13/2026 04 PM PDT           12.56            662         -      Not Applicable
  04/13/2026 05 PM PDT           12.55            652         -      Not Applicable
  04/13/2026 06 PM PDT           12.54            641         -      Not Applicable
  04/13/2026 07 PM PDT           12.53            631         -      Not Applicable
  04/13/2026 08 PM PDT           12.51            610         -      Not Applicable
  04/13/2026 09 PM PDT           12.50            600         -      Not Applicable
  04/13/2026 10 PM PDT           12.49            590         -      Not Applicable
  04/13/2026 11 PM PDT           12.49            590         0      Not Applicable
  04/14/2026 12 AM PDT           12.48            580         -      Not Applicable
  04/14/2026 01 AM PDT           12.47            570         -      Not Applicable
  04/14/2026 02 AM PDT           12.46            560         -      Not Applicable
  04/14/2026 03 AM PDT           12.45            550         -      Not Applicable
  04/14/2026 04 AM PDT           12.45            550         0      Not Applicable
  04/14/2026 05 AM PDT           12.44            540         -      Not Applicable
  04/14/2026 06 AM PDT           12.43            530         -      Not Applicable
  04/14/2026 07 AM PDT           12.43            530         0      Not Applicable
  04/14/2026 08 AM PDT           12.42            520         -      Not Applicable
  04/14/2026 09 AM PDT           12.42            520         0      Not Applicable
  04/14/2026 10 AM PDT           12.41            510         -      Not Applicable
  04/14/2026 11 AM PDT           12.41            510         0      Not Applicable
  04/14/2026 12 PM PDT           12.40            500         -      Not Applicable
  04/14/2026 01 PM PDT           12.40            500         0      Not Applicable
  04/14/2026 02 PM PDT           12.39            490         -      Not Applicable
  04/14/2026 03 PM PDT           12.39            490         0      Not Applicable
  04/14/2026 04 PM PDT           12.38            479         -      Not Applicable
  04/14/2026 05 PM PDT           12.38            479         0      Not Applicable
  04/14/2026 06 PM PDT           12.38            479         0      Not Applicable
  04/14/2026 07 PM PDT           12.37            469         -      Not Applicable
  04/14/2026 08 PM PDT           12.37            469         0      Not Applicable
  04/14/2026 09 PM PDT           12.37            469         0      Not Applicable
  04/14/2026 10 PM PDT           12.36            458         -      Not Applicable
  04/14/2026 11 PM PDT           12.36            458         0      Not Applicable
  04/15/2026 12 AM PDT           12.36            458         0      Not Applicable
  04/15/2026 01 AM PDT           12.35            448         -      Not Applicable
  04/15/2026 02 AM PDT           12.35            448         0      Not Applicable
  04/15/2026 03 AM PDT           12.35            448         0      Not Applicable
  04/15/2026 04 AM PDT           12.35            448         0      Not Applicable
  04/15/2026 05 AM PDT           12.34            438         -      Not Applicable
  04/15/2026 06 AM PDT           12.34            438         0      Not Applicable
  04/15/2026 07 AM PDT           12.34            438         0      Not Applicable
  04/15/2026 08 AM PDT           12.34            438         0      Not Applicable
  04/15/2026 09 AM PDT           12.33            428         -      Not Applicable
  04/15/2026 10 AM PDT           12.33            428         0      Not Applicable
  04/15/2026 11 AM PDT           12.33            428         0      Not Applicable
  04/15/2026 12 PM PDT           12.33            428         0      Not Applicable
  04/15/2026 01 PM PDT           12.32            419         -      Not Applicable
  04/15/2026 02 PM PDT           12.32            419         0      Not Applicable
  04/15/2026 03 PM PDT           12.32            419         0      Not Applicable
  04/15/2026 04 PM PDT           12.32            419         0      Not Applicable
  04/15/2026 05 PM PDT           12.32            419         0      Not Applicable
  04/15/2026 06 PM PDT           12.31            409         -      Not Applicable
  04/15/2026 07 PM PDT           12.31            409         0      Not Applicable
  04/15/2026 08 PM PDT           12.31            409         0      Not Applicable
  04/15/2026 09 PM PDT           12.31            409         0      Not Applicable
  04/15/2026 10 PM PDT           12.31            409         0      Not Applicable
  04/15/2026 11 PM PDT           12.31            409         0      Not Applicable
  04/16/2026 12 AM PDT           12.31            409         0      Not Applicable
  04/16/2026 01 AM PDT           12.31            409         0      Not Applicable
  04/16/2026 02 AM PDT           12.30            400         -      Not Applicable
  04/16/2026 03 AM PDT           12.30            400         0      Not Applicable
  04/16/2026 04 AM PDT           12.30            400         0      Not Applicable
  04/16/2026 05 AM PDT           12.30            400         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.