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: Aug 31 2026 at 7:15 AM PDTNext Issuance: Sep 01 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:  08/31/2026 at 07:18 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  08/27/2026 at 07:00 PM PDT
# Maximum Observed Stage:                       11.05 Feet
# Maximum Observed Flow:                        17 cfs
#
# Earliest Date & Time of Maximum Forecast:     09/03/2026 at 10:00 PM PDT
# Maximum Forecast Stage:                       11.44 Feet
# Maximum Forecast Flow:                        57 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  08/26/2026 07 AM PDT           11.04             16                Not Applicable
  08/26/2026 08 AM PDT           11.04             16         0      Not Applicable
  08/26/2026 09 AM PDT           11.04             16         0      Not Applicable
  08/26/2026 10 AM PDT           11.04             16         0      Not Applicable
  08/26/2026 11 AM PDT           11.04             16         0      Not Applicable
  08/26/2026 12 PM PDT           11.04             16         0      Not Applicable
  08/26/2026 01 PM PDT           11.04             16         0      Not Applicable
  08/26/2026 02 PM PDT           11.03             15         -      Not Applicable
  08/26/2026 03 PM PDT           11.04             16         +      Not Applicable
  08/26/2026 04 PM PDT           11.04             16         0      Not Applicable
  08/26/2026 05 PM PDT           11.04             16         0      Not Applicable
  08/26/2026 06 PM PDT           11.04             16         0      Not Applicable
  08/26/2026 07 PM PDT           11.04             16         0      Not Applicable
  08/26/2026 08 PM PDT           11.04             16         0      Not Applicable
  08/26/2026 09 PM PDT           11.04             16         0      Not Applicable
  08/26/2026 10 PM PDT           11.04             16         0      Not Applicable
  08/26/2026 11 PM PDT           11.04             16         0      Not Applicable
  08/27/2026 12 AM PDT           11.04             16         0      Not Applicable
  08/27/2026 01 AM PDT           11.04             16         0      Not Applicable
  08/27/2026 02 AM PDT           11.04             16         0      Not Applicable
  08/27/2026 03 AM PDT           11.04             16         0      Not Applicable
  08/27/2026 04 AM PDT           11.04             16         0      Not Applicable
  08/27/2026 05 AM PDT           11.04             16         0      Not Applicable
  08/27/2026 06 AM PDT           11.04             16         0      Not Applicable
  08/27/2026 07 AM PDT           11.04             16         0      Not Applicable
  08/27/2026 08 AM PDT           11.04             16         0      Not Applicable
  08/27/2026 09 AM PDT           11.04             16         0      Not Applicable
  08/27/2026 10 AM PDT           11.04             16         0      Not Applicable
  08/27/2026 11 AM PDT           11.04             16         0      Not Applicable
  08/27/2026 12 PM PDT           11.04             16         0      Not Applicable
  08/27/2026 01 PM PDT           11.04             16         0      Not Applicable
  08/27/2026 02 PM PDT           11.04             16         0      Not Applicable
  08/27/2026 03 PM PDT           11.04             16         0      Not Applicable
  08/27/2026 04 PM PDT           11.04             16         0      Not Applicable
  08/27/2026 05 PM PDT           11.04             16         0      Not Applicable
  08/27/2026 06 PM PDT           11.04             16         0      Not Applicable
  08/27/2026 07 PM PDT           11.05             17         +      Not Applicable
  08/27/2026 08 PM PDT           11.04             16         -      Not Applicable
  08/27/2026 09 PM PDT           11.04             16         0      Not Applicable
  08/27/2026 10 PM PDT           11.04             16         0      Not Applicable
  08/27/2026 11 PM PDT           11.04             16         0      Not Applicable
  08/28/2026 12 AM PDT           11.04             16         0      Not Applicable
  08/28/2026 01 AM PDT           11.04             16         0      Not Applicable
  08/28/2026 02 AM PDT           11.04             16         0      Not Applicable
  08/28/2026 03 AM PDT           11.04             16         0      Not Applicable
  08/28/2026 04 AM PDT           11.04             16         0      Not Applicable
  08/28/2026 05 AM PDT           11.04             16         0      Not Applicable
  08/28/2026 06 AM PDT           11.04             16         0      Not Applicable
  08/28/2026 07 AM PDT           11.03             15         -      Not Applicable
  08/28/2026 08 AM PDT           11.04             16         +      Not Applicable
  08/28/2026 09 AM PDT           11.04             16         0      Not Applicable
  08/28/2026 10 AM PDT           11.03             15         -      Not Applicable
  08/28/2026 11 AM PDT           11.03             15         0      Not Applicable
  08/28/2026 12 PM PDT           11.03             15         0      Not Applicable
  08/28/2026 01 PM PDT           11.03             15         0      Not Applicable
  08/28/2026 02 PM PDT           11.03             15         0      Not Applicable
  08/28/2026 03 PM PDT           11.04             16         +      Not Applicable
  08/28/2026 04 PM PDT           11.04             16         0      Not Applicable
  08/28/2026 05 PM PDT           11.04             16         0      Not Applicable
  08/28/2026 06 PM PDT           11.03             15         -      Not Applicable
  08/28/2026 07 PM PDT           11.01             13         -      Not Applicable
  08/28/2026 08 PM PDT           11.02             14         +      Not Applicable
  08/28/2026 09 PM PDT           11.03             15         +      Not Applicable
  08/28/2026 10 PM PDT           11.04             16         +      Not Applicable
  08/28/2026 11 PM PDT           11.04             16         0      Not Applicable
  08/29/2026 12 AM PDT           11.04             16         0      Not Applicable
  08/29/2026 01 AM PDT           11.04             16         0      Not Applicable
  08/29/2026 02 AM PDT           11.03             15         -      Not Applicable
  08/29/2026 03 AM PDT           11.03             15         0      Not Applicable
  08/29/2026 04 AM PDT           11.03             15         0      Not Applicable
  08/29/2026 05 AM PDT           11.03             15         0      Not Applicable
  08/29/2026 06 AM PDT           11.03             15         0      Not Applicable
  08/29/2026 07 AM PDT           11.03             15         0      Not Applicable
  08/29/2026 08 AM PDT           11.04             16         +      Not Applicable
  08/29/2026 09 AM PDT           11.03             15         -      Not Applicable
  08/29/2026 10 AM PDT           11.02             14         -      Not Applicable
  08/29/2026 11 AM PDT           11.03             15         +      Not Applicable
  08/29/2026 12 PM PDT           11.03             15         0      Not Applicable
  08/29/2026 01 PM PDT           11.02             14         -      Not Applicable
  08/29/2026 02 PM PDT           11.03             15         +      Not Applicable
  08/29/2026 03 PM PDT           11.04             16         +      Not Applicable
  08/29/2026 04 PM PDT           11.03             15         -      Not Applicable
  08/29/2026 05 PM PDT           11.03             15         0      Not Applicable
  08/29/2026 06 PM PDT           11.02             14         -      Not Applicable
  08/29/2026 07 PM PDT           11.02             14         0      Not Applicable
  08/29/2026 08 PM PDT           11.02             14         0      Not Applicable
  08/29/2026 09 PM PDT           11.01             13         -      Not Applicable
  08/29/2026 10 PM PDT           11.02             14         +      Not Applicable
  08/29/2026 11 PM PDT           11.03             15         +      Not Applicable
  08/30/2026 12 AM PDT           11.04             16         +      Not Applicable
  08/30/2026 01 AM PDT           11.04             16         0      Not Applicable
  08/30/2026 02 AM PDT           11.03             15         -      Not Applicable
  08/30/2026 03 AM PDT           11.03             15         0      Not Applicable
  08/30/2026 04 AM PDT           11.03             15         0      Not Applicable
  08/30/2026 05 AM PDT           11.03             15         0      Not Applicable
  08/30/2026 06 AM PDT           11.03             15         0      Not Applicable
  08/30/2026 07 AM PDT           11.03             15         0      Not Applicable
  08/30/2026 08 AM PDT           11.03             15         0      Not Applicable
  08/30/2026 09 AM PDT           11.03             15         0      Not Applicable
  08/30/2026 10 AM PDT           11.03             15         0      Not Applicable
  08/30/2026 11 AM PDT           11.03             15         0      Not Applicable
  08/30/2026 12 PM PDT           11.03             15         0      Not Applicable
  08/30/2026 01 PM PDT           11.03             15         0      Not Applicable
  08/30/2026 02 PM PDT           11.03             15         0      Not Applicable
  08/30/2026 03 PM PDT           11.03             15         0      Not Applicable
  08/30/2026 04 PM PDT           11.03             15         0      Not Applicable
  08/30/2026 05 PM PDT           11.04             16         +      Not Applicable
  08/30/2026 06 PM PDT           11.04             16         0      Not Applicable
  08/30/2026 07 PM PDT           11.04             16         0      Not Applicable
  08/30/2026 08 PM PDT           11.04             16         0      Not Applicable
  08/30/2026 09 PM PDT           11.03             15         -      Not Applicable
  08/30/2026 10 PM PDT           11.03             15         0      Not Applicable
  08/30/2026 11 PM PDT           11.03             15         0      Not Applicable
  08/31/2026 12 AM PDT           11.03             15         0      Not Applicable
  08/31/2026 01 AM PDT           11.03             15         0      Not Applicable
  08/31/2026 02 AM PDT           11.03             15         0      Not Applicable
  08/31/2026 03 AM PDT           11.03             15         0      Not Applicable
  08/31/2026 04 AM PDT           11.03             15         0      Not Applicable
  08/31/2026 05 AM PDT           11.03             15         0      Not Applicable
  08/31/2026 06 AM PDT           11.03             15         0      Not Applicable
  08/31/2026 07 AM PDT           11.03             15         0      Not Applicable
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  08/31/2026 08 AM PDT           11.03             15                Not Applicable
  08/31/2026 09 AM PDT           11.03             15         0      Not Applicable
  08/31/2026 10 AM PDT           11.03             15         0      Not Applicable
  08/31/2026 11 AM PDT           11.03             15         0      Not Applicable
  08/31/2026 12 PM PDT           11.03             15         0      Not Applicable
  08/31/2026 01 PM PDT           11.03             15         0      Not Applicable
  08/31/2026 02 PM PDT           11.03             15         0      Not Applicable
  08/31/2026 03 PM PDT           11.03             15         0      Not Applicable
  08/31/2026 04 PM PDT           11.03             15         0      Not Applicable
  08/31/2026 05 PM PDT           11.03             15         0      Not Applicable
  08/31/2026 06 PM PDT           11.03             15         0      Not Applicable
  08/31/2026 07 PM PDT           11.03             15         0      Not Applicable
  08/31/2026 08 PM PDT           11.03             15         0      Not Applicable
  08/31/2026 09 PM PDT           11.03             15         0      Not Applicable
  08/31/2026 10 PM PDT           11.03             15         0      Not Applicable
  08/31/2026 11 PM PDT           11.03             15         0      Not Applicable
  09/01/2026 12 AM PDT           11.03             15         0      Not Applicable
  09/01/2026 01 AM PDT           11.03             15         0      Not Applicable
  09/01/2026 02 AM PDT           11.03             15         0      Not Applicable
  09/01/2026 03 AM PDT           11.03             15         0      Not Applicable
  09/01/2026 04 AM PDT           11.03             15         0      Not Applicable
  09/01/2026 05 AM PDT           11.03             15         0      Not Applicable
  09/01/2026 06 AM PDT           11.03             15         0      Not Applicable
  09/01/2026 07 AM PDT           11.03             15         0      Not Applicable
  09/01/2026 08 AM PDT           11.03             15         0      Not Applicable
  09/01/2026 09 AM PDT           11.03             15         0      Not Applicable
  09/01/2026 10 AM PDT           11.03             15         0      Not Applicable
  09/01/2026 11 AM PDT           11.03             15         0      Not Applicable
  09/01/2026 12 PM PDT           11.03             15         0      Not Applicable
  09/01/2026 01 PM PDT           11.03             15         0      Not Applicable
  09/01/2026 02 PM PDT           11.03             15         0      Not Applicable
  09/01/2026 03 PM PDT           11.03             15         0      Not Applicable
  09/01/2026 04 PM PDT           11.03             15         0      Not Applicable
  09/01/2026 05 PM PDT           11.03             15         0      Not Applicable
  09/01/2026 06 PM PDT           11.03             15         0      Not Applicable
  09/01/2026 07 PM PDT           11.03             15         0      Not Applicable
  09/01/2026 08 PM PDT           11.03             15         0      Not Applicable
  09/01/2026 09 PM PDT           11.03             15         0      Not Applicable
  09/01/2026 10 PM PDT           11.03             15         0      Not Applicable
  09/01/2026 11 PM PDT           11.03             15         0      Not Applicable
  09/02/2026 12 AM PDT           11.03             15         0      Not Applicable
  09/02/2026 01 AM PDT           11.03             15         0      Not Applicable
  09/02/2026 02 AM PDT           11.03             15         0      Not Applicable
  09/02/2026 03 AM PDT           11.03             15         0      Not Applicable
  09/02/2026 04 AM PDT           11.03             15         0      Not Applicable
  09/02/2026 05 AM PDT           11.03             15         0      Not Applicable
  09/02/2026 06 AM PDT           11.03             15         0      Not Applicable
  09/02/2026 07 AM PDT           11.03             15         0      Not Applicable
  09/02/2026 08 AM PDT           11.04             16         +      Not Applicable
  09/02/2026 09 AM PDT           11.04             16         0      Not Applicable
  09/02/2026 10 AM PDT           11.04             16         0      Not Applicable
  09/02/2026 11 AM PDT           11.05             17         +      Not Applicable
  09/02/2026 12 PM PDT           11.05             17         0      Not Applicable
  09/02/2026 01 PM PDT           11.06             18         +      Not Applicable
  09/02/2026 02 PM PDT           11.06             18         0      Not Applicable
  09/02/2026 03 PM PDT           11.07             19         +      Not Applicable
  09/02/2026 04 PM PDT           11.07             19         0      Not Applicable
  09/02/2026 05 PM PDT           11.08             20         +      Not Applicable
  09/02/2026 06 PM PDT           11.08             20         0      Not Applicable
  09/02/2026 07 PM PDT           11.09             21         +      Not Applicable
  09/02/2026 08 PM PDT           11.09             21         0      Not Applicable
  09/02/2026 09 PM PDT           11.09             21         0      Not Applicable
  09/02/2026 10 PM PDT           11.09             21         0      Not Applicable
  09/02/2026 11 PM PDT           11.09             21         0      Not Applicable
  09/03/2026 12 AM PDT           11.09             21         0      Not Applicable
  09/03/2026 01 AM PDT           11.09             21         0      Not Applicable
  09/03/2026 02 AM PDT           11.10             23         +      Not Applicable
  09/03/2026 03 AM PDT           11.10             23         0      Not Applicable
  09/03/2026 04 AM PDT           11.10             23         0      Not Applicable
  09/03/2026 05 AM PDT           11.10             23         0      Not Applicable
  09/03/2026 06 AM PDT           11.11             24         +      Not Applicable
  09/03/2026 07 AM PDT           11.11             24         0      Not Applicable
  09/03/2026 08 AM PDT           11.12             25         +      Not Applicable
  09/03/2026 09 AM PDT           11.14             27         +      Not Applicable
  09/03/2026 10 AM PDT           11.16             28         +      Not Applicable
  09/03/2026 11 AM PDT           11.19             31         +      Not Applicable
  09/03/2026 12 PM PDT           11.22             33         +      Not Applicable
  09/03/2026 01 PM PDT           11.25             36         +      Not Applicable
  09/03/2026 02 PM PDT           11.29             40         +      Not Applicable
  09/03/2026 03 PM PDT           11.32             43         +      Not Applicable
  09/03/2026 04 PM PDT           11.34             45         +      Not Applicable
  09/03/2026 05 PM PDT           11.37             49         +      Not Applicable
  09/03/2026 06 PM PDT           11.39             51         +      Not Applicable
  09/03/2026 07 PM PDT           11.41             54         +      Not Applicable
  09/03/2026 08 PM PDT           11.42             55         +      Not Applicable
  09/03/2026 09 PM PDT           11.43             56         +      Not Applicable
  09/03/2026 10 PM PDT           11.44             57         +      Not Applicable
  09/03/2026 11 PM PDT           11.44             57         0      Not Applicable
  09/04/2026 12 AM PDT           11.44             57         0      Not Applicable
  09/04/2026 01 AM PDT           11.44             57         0      Not Applicable
  09/04/2026 02 AM PDT           11.43             56         -      Not Applicable
  09/04/2026 03 AM PDT           11.42             55         -      Not Applicable
  09/04/2026 04 AM PDT           11.41             54         -      Not Applicable
  09/04/2026 05 AM PDT           11.40             52         -      Not Applicable
  09/04/2026 06 AM PDT           11.39             51         -      Not Applicable
  09/04/2026 07 AM PDT           11.38             50         -      Not Applicable
  09/04/2026 08 AM PDT           11.37             49         -      Not Applicable
  09/04/2026 09 AM PDT           11.35             46         -      Not Applicable
  09/04/2026 10 AM PDT           11.34             45         -      Not Applicable
  09/04/2026 11 AM PDT           11.32             43         -      Not Applicable
  09/04/2026 12 PM PDT           11.31             42         -      Not Applicable
  09/04/2026 01 PM PDT           11.29             40         -      Not Applicable
  09/04/2026 02 PM PDT           11.28             39         -      Not Applicable
  09/04/2026 03 PM PDT           11.27             38         -      Not Applicable
  09/04/2026 04 PM PDT           11.25             36         -      Not Applicable
  09/04/2026 05 PM PDT           11.24             35         -      Not Applicable
  09/04/2026 06 PM PDT           11.22             33         -      Not Applicable
  09/04/2026 07 PM PDT           11.21             33         -      Not Applicable
  09/04/2026 08 PM PDT           11.20             32         -      Not Applicable
  09/04/2026 09 PM PDT           11.19             31         -      Not Applicable
  09/04/2026 10 PM PDT           11.17             29         -      Not Applicable
  09/04/2026 11 PM PDT           11.16             28         -      Not Applicable
  09/05/2026 12 AM PDT           11.15             28         -      Not Applicable
  09/05/2026 01 AM PDT           11.14             27         -      Not Applicable
  09/05/2026 02 AM PDT           11.13             26         -      Not Applicable
  09/05/2026 03 AM PDT           11.12             25         -      Not Applicable
  09/05/2026 04 AM PDT           11.11             24         -      Not Applicable
  09/05/2026 05 AM PDT           11.11             24         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.