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: May 06 2026 at 7:26 AM PDTNext Issuance: May 07 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:  05/06/2026 at 07:27 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  05/01/2026 at 06:00 PM PDT
# Maximum Observed Stage:                       12.11 Feet
# Maximum Observed Flow:                        248 cfs
#
# Earliest Date & Time of Maximum Forecast:     05/06/2026 at 08:00 AM PDT
# Maximum Forecast Stage:                       12.05 Feet
# Maximum Forecast Flow:                        210 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  05/01/2026 07 AM PDT           12.11            248                Not Applicable
  05/01/2026 08 AM PDT           12.11            248         0      Not Applicable
  05/01/2026 09 AM PDT           12.11            248         0      Not Applicable
  05/01/2026 10 AM PDT           12.11            248         0      Not Applicable
  05/01/2026 11 AM PDT           12.11            248         0      Not Applicable
  05/01/2026 12 PM PDT           12.11            248         0      Not Applicable
  05/01/2026 01 PM PDT           12.11            248         0      Not Applicable
  05/01/2026 02 PM PDT           12.11            248         0      Not Applicable
  05/01/2026 03 PM PDT           12.11            248         0      Not Applicable
  05/01/2026 04 PM PDT           12.11            248         0      Not Applicable
  05/01/2026 05 PM PDT           12.11            248         0      Not Applicable
  05/01/2026 06 PM PDT           12.11            248         0      Not Applicable
  05/01/2026 07 PM PDT           12.10            242         -      Not Applicable
  05/01/2026 08 PM PDT           12.10            242         0      Not Applicable
  05/01/2026 09 PM PDT           12.10            242         0      Not Applicable
  05/01/2026 10 PM PDT           12.10            242         0      Not Applicable
  05/01/2026 11 PM PDT           12.10            242         0      Not Applicable
  05/02/2026 12 AM PDT           12.10            242         0      Not Applicable
  05/02/2026 01 AM PDT           12.10            242         0      Not Applicable
  05/02/2026 02 AM PDT           12.10            242         0      Not Applicable
  05/02/2026 03 AM PDT           12.10            242         0      Not Applicable
  05/02/2026 04 AM PDT           12.10            242         0      Not Applicable
  05/02/2026 05 AM PDT           12.10            242         0      Not Applicable
  05/02/2026 06 AM PDT           12.10            242         0      Not Applicable
  05/02/2026 07 AM PDT           12.10            242         0      Not Applicable
  05/02/2026 08 AM PDT           12.10            242         0      Not Applicable
  05/02/2026 09 AM PDT           12.10            242         0      Not Applicable
  05/02/2026 10 AM PDT           12.10            242         0      Not Applicable
  05/02/2026 11 AM PDT           12.10            242         0      Not Applicable
  05/02/2026 12 PM PDT           12.10            242         0      Not Applicable
  05/02/2026 01 PM PDT           12.10            242         0      Not Applicable
  05/02/2026 02 PM PDT           12.10            242         0      Not Applicable
  05/02/2026 03 PM PDT           12.09            235         -      Not Applicable
  05/02/2026 04 PM PDT           12.10            242         +      Not Applicable
  05/02/2026 05 PM PDT           12.09            235         -      Not Applicable
  05/02/2026 06 PM PDT           12.09            235         0      Not Applicable
  05/02/2026 07 PM PDT           12.10            242         +      Not Applicable
  05/02/2026 08 PM PDT           12.09            235         -      Not Applicable
  05/02/2026 09 PM PDT           12.09            235         0      Not Applicable
  05/02/2026 10 PM PDT           12.09            235         0      Not Applicable
  05/02/2026 11 PM PDT           12.09            235         0      Not Applicable
  05/03/2026 12 AM PDT           12.09            235         0      Not Applicable
  05/03/2026 01 AM PDT           12.09            235         0      Not Applicable
  05/03/2026 02 AM PDT           12.09            235         0      Not Applicable
  05/03/2026 03 AM PDT           12.09            235         0      Not Applicable
  05/03/2026 04 AM PDT           12.09            235         0      Not Applicable
  05/03/2026 05 AM PDT           12.09            235         0      Not Applicable
  05/03/2026 06 AM PDT           12.08            229         -      Not Applicable
  05/03/2026 07 AM PDT           12.08            229         0      Not Applicable
  05/03/2026 08 AM PDT           12.08            229         0      Not Applicable
  05/03/2026 09 AM PDT           12.08            229         0      Not Applicable
  05/03/2026 10 AM PDT           12.08            229         0      Not Applicable
  05/03/2026 11 AM PDT           12.08            229         0      Not Applicable
  05/03/2026 12 PM PDT           12.08            229         0      Not Applicable
  05/03/2026 01 PM PDT           12.08            229         0      Not Applicable
  05/03/2026 02 PM PDT           12.08            229         0      Not Applicable
  05/03/2026 03 PM PDT           12.08            229         0      Not Applicable
  05/03/2026 04 PM PDT           12.08            229         0      Not Applicable
  05/03/2026 05 PM PDT           12.08            229         0      Not Applicable
  05/03/2026 06 PM PDT           12.08            229         0      Not Applicable
  05/03/2026 07 PM PDT           12.08            229         0      Not Applicable
  05/03/2026 08 PM PDT           12.08            229         0      Not Applicable
  05/03/2026 09 PM PDT           12.08            229         0      Not Applicable
  05/03/2026 10 PM PDT           12.08            229         0      Not Applicable
  05/03/2026 11 PM PDT           12.09            235         +      Not Applicable
  05/04/2026 12 AM PDT           12.09            235         0      Not Applicable
  05/04/2026 01 AM PDT           12.09            235         0      Not Applicable
  05/04/2026 02 AM PDT           12.09            235         0      Not Applicable
  05/04/2026 03 AM PDT           12.09            235         0      Not Applicable
  05/04/2026 04 AM PDT           12.09            235         0      Not Applicable
  05/04/2026 05 AM PDT           12.08            229         -      Not Applicable
  05/04/2026 06 AM PDT           12.08            229         0      Not Applicable
  05/04/2026 07 AM PDT           12.08            229         0      Not Applicable
  05/04/2026 08 AM PDT           12.08            229         0      Not Applicable
  05/04/2026 09 AM PDT           12.08            229         0      Not Applicable
  05/04/2026 10 AM PDT           12.08            229         0      Not Applicable
  05/04/2026 11 AM PDT           12.08            229         0      Not Applicable
  05/04/2026 12 PM PDT           12.08            229         0      Not Applicable
  05/04/2026 01 PM PDT           12.08            229         0      Not Applicable
  05/04/2026 02 PM PDT           12.08            229         0      Not Applicable
  05/04/2026 03 PM PDT           12.08            229         0      Not Applicable
  05/04/2026 04 PM PDT           12.08            229         0      Not Applicable
  05/04/2026 05 PM PDT           12.08            229         0      Not Applicable
  05/04/2026 06 PM PDT           12.08            229         0      Not Applicable
  05/04/2026 07 PM PDT           12.08            229         0      Not Applicable
  05/04/2026 08 PM PDT           12.07            222         -      Not Applicable
  05/04/2026 09 PM PDT           12.07            222         0      Not Applicable
  05/04/2026 10 PM PDT           12.07            222         0      Not Applicable
  05/04/2026 11 PM PDT           12.07            222         0      Not Applicable
  05/05/2026 12 AM PDT           12.07            222         0      Not Applicable
  05/05/2026 01 AM PDT           12.07            222         0      Not Applicable
  05/05/2026 02 AM PDT           12.07            222         0      Not Applicable
  05/05/2026 03 AM PDT           12.07            222         0      Not Applicable
  05/05/2026 04 AM PDT           12.07            222         0      Not Applicable
  05/05/2026 05 AM PDT           12.07            222         0      Not Applicable
  05/05/2026 06 AM PDT           12.07            222         0      Not Applicable
  05/05/2026 07 AM PDT           12.06            216         -      Not Applicable
  05/05/2026 08 AM PDT           12.06            216         0      Not Applicable
  05/05/2026 09 AM PDT           12.06            216         0      Not Applicable
  05/05/2026 10 AM PDT           12.06            216         0      Not Applicable
  05/05/2026 11 AM PDT           12.07            222         +      Not Applicable
  05/05/2026 12 PM PDT           12.07            222         0      Not Applicable
  05/05/2026 01 PM PDT           12.07            222         0      Not Applicable
  05/05/2026 02 PM PDT           12.06            216         -      Not Applicable
  05/05/2026 03 PM PDT           12.07            222         +      Not Applicable
  05/05/2026 04 PM PDT           12.06            216         -      Not Applicable
  05/05/2026 05 PM PDT           12.06            216         0      Not Applicable
  05/05/2026 06 PM PDT           12.06            216         0      Not Applicable
  05/05/2026 07 PM PDT           12.06            216         0      Not Applicable
  05/05/2026 08 PM PDT           12.06            216         0      Not Applicable
  05/05/2026 09 PM PDT           12.05            210         -      Not Applicable
  05/05/2026 10 PM PDT           12.05            210         0      Not Applicable
  05/05/2026 11 PM PDT           12.06            216         +      Not Applicable
  05/06/2026 12 AM PDT           12.05            210         -      Not Applicable
  05/06/2026 01 AM PDT           12.05            210         0      Not Applicable
  05/06/2026 02 AM PDT           12.05            210         0      Not Applicable
  05/06/2026 03 AM PDT           12.05            210         0      Not Applicable
  05/06/2026 04 AM PDT           12.05            210         0      Not Applicable
  05/06/2026 05 AM PDT           12.05            210         0      Not Applicable
  05/06/2026 06 AM PDT           12.05            210         0      Not Applicable
  05/06/2026 07 AM PDT           12.05            210         0      Not Applicable
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  05/06/2026 08 AM PDT           12.05            210                Not Applicable
  05/06/2026 09 AM PDT           12.05            210         0      Not Applicable
  05/06/2026 10 AM PDT           12.05            210         0      Not Applicable
  05/06/2026 11 AM PDT           12.05            210         0      Not Applicable
  05/06/2026 12 PM PDT           12.05            210         0      Not Applicable
  05/06/2026 01 PM PDT           12.04            204         -      Not Applicable
  05/06/2026 02 PM PDT           12.04            204         0      Not Applicable
  05/06/2026 03 PM PDT           12.04            204         0      Not Applicable
  05/06/2026 04 PM PDT           12.04            204         0      Not Applicable
  05/06/2026 05 PM PDT           12.04            204         0      Not Applicable
  05/06/2026 06 PM PDT           12.04            204         0      Not Applicable
  05/06/2026 07 PM PDT           12.04            204         0      Not Applicable
  05/06/2026 08 PM PDT           12.04            204         0      Not Applicable
  05/06/2026 09 PM PDT           12.04            204         0      Not Applicable
  05/06/2026 10 PM PDT           12.04            204         0      Not Applicable
  05/06/2026 11 PM PDT           12.04            204         0      Not Applicable
  05/07/2026 12 AM PDT           12.04            204         0      Not Applicable
  05/07/2026 01 AM PDT           12.04            204         0      Not Applicable
  05/07/2026 02 AM PDT           12.04            204         0      Not Applicable
  05/07/2026 03 AM PDT           12.04            204         0      Not Applicable
  05/07/2026 04 AM PDT           12.04            204         0      Not Applicable
  05/07/2026 05 AM PDT           12.04            204         0      Not Applicable
  05/07/2026 06 AM PDT           12.04            204         0      Not Applicable
  05/07/2026 07 AM PDT           12.04            204         0      Not Applicable
  05/07/2026 08 AM PDT           12.04            204         0      Not Applicable
  05/07/2026 09 AM PDT           12.04            204         0      Not Applicable
  05/07/2026 10 AM PDT           12.04            204         0      Not Applicable
  05/07/2026 11 AM PDT           12.04            204         0      Not Applicable
  05/07/2026 12 PM PDT           12.03            199         -      Not Applicable
  05/07/2026 01 PM PDT           12.03            199         0      Not Applicable
  05/07/2026 02 PM PDT           12.03            199         0      Not Applicable
  05/07/2026 03 PM PDT           12.03            199         0      Not Applicable
  05/07/2026 04 PM PDT           12.03            199         0      Not Applicable
  05/07/2026 05 PM PDT           12.03            199         0      Not Applicable
  05/07/2026 06 PM PDT           12.03            199         0      Not Applicable
  05/07/2026 07 PM PDT           12.03            199         0      Not Applicable
  05/07/2026 08 PM PDT           12.03            199         0      Not Applicable
  05/07/2026 09 PM PDT           12.03            199         0      Not Applicable
  05/07/2026 10 PM PDT           12.03            199         0      Not Applicable
  05/07/2026 11 PM PDT           12.03            199         0      Not Applicable
  05/08/2026 12 AM PDT           12.03            199         0      Not Applicable
  05/08/2026 01 AM PDT           12.03            199         0      Not Applicable
  05/08/2026 02 AM PDT           12.03            199         0      Not Applicable
  05/08/2026 03 AM PDT           12.03            199         0      Not Applicable
  05/08/2026 04 AM PDT           12.03            199         0      Not Applicable
  05/08/2026 05 AM PDT           12.03            199         0      Not Applicable
  05/08/2026 06 AM PDT           12.03            199         0      Not Applicable
  05/08/2026 07 AM PDT           12.03            199         0      Not Applicable
  05/08/2026 08 AM PDT           12.03            199         0      Not Applicable
  05/08/2026 09 AM PDT           12.03            199         0      Not Applicable
  05/08/2026 10 AM PDT           12.03            199         0      Not Applicable
  05/08/2026 11 AM PDT           12.02            193         -      Not Applicable
  05/08/2026 12 PM PDT           12.02            193         0      Not Applicable
  05/08/2026 01 PM PDT           12.02            193         0      Not Applicable
  05/08/2026 02 PM PDT           12.02            193         0      Not Applicable
  05/08/2026 03 PM PDT           12.02            193         0      Not Applicable
  05/08/2026 04 PM PDT           12.02            193         0      Not Applicable
  05/08/2026 05 PM PDT           12.02            193         0      Not Applicable
  05/08/2026 06 PM PDT           12.02            193         0      Not Applicable
  05/08/2026 07 PM PDT           12.02            193         0      Not Applicable
  05/08/2026 08 PM PDT           12.02            193         0      Not Applicable
  05/08/2026 09 PM PDT           12.02            193         0      Not Applicable
  05/08/2026 10 PM PDT           12.02            193         0      Not Applicable
  05/08/2026 11 PM PDT           12.02            193         0      Not Applicable
  05/09/2026 12 AM PDT           12.02            193         0      Not Applicable
  05/09/2026 01 AM PDT           12.02            193         0      Not Applicable
  05/09/2026 02 AM PDT           12.02            193         0      Not Applicable
  05/09/2026 03 AM PDT           12.02            193         0      Not Applicable
  05/09/2026 04 AM PDT           12.02            193         0      Not Applicable
  05/09/2026 05 AM PDT           12.02            193         0      Not Applicable
  05/09/2026 06 AM PDT           12.02            193         0      Not Applicable
  05/09/2026 07 AM PDT           12.02            193         0      Not Applicable
  05/09/2026 08 AM PDT           12.02            193         0      Not Applicable
  05/09/2026 09 AM PDT           12.02            193         0      Not Applicable
  05/09/2026 10 AM PDT           12.02            193         0      Not Applicable
  05/09/2026 11 AM PDT           12.01            187         -      Not Applicable
  05/09/2026 12 PM PDT           12.01            187         0      Not Applicable
  05/09/2026 01 PM PDT           12.01            187         0      Not Applicable
  05/09/2026 02 PM PDT           12.01            187         0      Not Applicable
  05/09/2026 03 PM PDT           12.01            187         0      Not Applicable
  05/09/2026 04 PM PDT           12.01            187         0      Not Applicable
  05/09/2026 05 PM PDT           12.01            187         0      Not Applicable
  05/09/2026 06 PM PDT           12.01            187         0      Not Applicable
  05/09/2026 07 PM PDT           12.01            187         0      Not Applicable
  05/09/2026 08 PM PDT           12.01            187         0      Not Applicable
  05/09/2026 09 PM PDT           12.01            187         0      Not Applicable
  05/09/2026 10 PM PDT           12.01            187         0      Not Applicable
  05/09/2026 11 PM PDT           12.01            187         0      Not Applicable
  05/10/2026 12 AM PDT           12.01            187         0      Not Applicable
  05/10/2026 01 AM PDT           12.01            187         0      Not Applicable
  05/10/2026 02 AM PDT           12.01            187         0      Not Applicable
  05/10/2026 03 AM PDT           12.01            187         0      Not Applicable
  05/10/2026 04 AM PDT           12.01            187         0      Not Applicable
  05/10/2026 05 AM PDT           12.01            187         0      Not Applicable
  05/10/2026 06 AM PDT           12.01            187         0      Not Applicable
  05/10/2026 07 AM PDT           12.01            187         0      Not Applicable
  05/10/2026 08 AM PDT           12.01            187         0      Not Applicable
  05/10/2026 09 AM PDT           12.01            187         0      Not Applicable
  05/10/2026 10 AM PDT           12.01            187         0      Not Applicable
  05/10/2026 11 AM PDT           12.01            187         0      Not Applicable
  05/10/2026 12 PM PDT           12.01            187         0      Not Applicable
  05/10/2026 01 PM PDT           12.00            182         -      Not Applicable
  05/10/2026 02 PM PDT           12.00            182         0      Not Applicable
  05/10/2026 03 PM PDT           12.00            182         0      Not Applicable
  05/10/2026 04 PM PDT           12.00            182         0      Not Applicable
  05/10/2026 05 PM PDT           12.00            182         0      Not Applicable
  05/10/2026 06 PM PDT           12.00            182         0      Not Applicable
  05/10/2026 07 PM PDT           12.00            182         0      Not Applicable
  05/10/2026 08 PM PDT           12.00            182         0      Not Applicable
  05/10/2026 09 PM PDT           12.00            182         0      Not Applicable
  05/10/2026 10 PM PDT           12.00            182         0      Not Applicable
  05/10/2026 11 PM PDT           12.00            182         0      Not Applicable
  05/11/2026 12 AM PDT           12.00            182         0      Not Applicable
  05/11/2026 01 AM PDT           12.00            182         0      Not Applicable
  05/11/2026 02 AM PDT           12.00            182         0      Not Applicable
  05/11/2026 03 AM PDT           12.00            182         0      Not Applicable
  05/11/2026 04 AM PDT           12.00            182         0      Not Applicable
  05/11/2026 05 AM PDT           12.00            182         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.