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 28 2026 at 7:34 AM PDTNext Issuance: Apr 29 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:  04/28/2026 at 07:36 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  04/23/2026 at 04:00 PM PDT
# Maximum Observed Stage:                       12.30 Feet
# Maximum Observed Flow:                        400 cfs
#
# Earliest Date & Time of Maximum Forecast:     04/28/2026 at 08:00 AM PDT
# Maximum Forecast Stage:                       12.18 Feet
# Maximum Forecast Flow:                        298 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  04/23/2026 07 AM PDT           12.30            400                Not Applicable
  04/23/2026 08 AM PDT           12.30            400         0      Not Applicable
  04/23/2026 09 AM PDT           12.30            400         0      Not Applicable
  04/23/2026 10 AM PDT           12.30            400         0      Not Applicable
  04/23/2026 11 AM PDT           12.29            390         -      Not Applicable
  04/23/2026 12 PM PDT           12.30            400         +      Not Applicable
  04/23/2026 01 PM PDT           12.30            400         0      Not Applicable
  04/23/2026 02 PM PDT           12.30            400         0      Not Applicable
  04/23/2026 03 PM PDT           12.30            400         0      Not Applicable
  04/23/2026 04 PM PDT           12.30            400         0      Not Applicable
  04/23/2026 05 PM PDT           12.29            390         -      Not Applicable
  04/23/2026 06 PM PDT           12.29            390         0      Not Applicable
  04/23/2026 07 PM PDT           12.29            390         0      Not Applicable
  04/23/2026 08 PM PDT           12.29            390         0      Not Applicable
  04/23/2026 09 PM PDT           12.28            381         -      Not Applicable
  04/23/2026 10 PM PDT           12.28            381         0      Not Applicable
  04/23/2026 11 PM PDT           12.28            381         0      Not Applicable
  04/24/2026 12 AM PDT           12.28            381         0      Not Applicable
  04/24/2026 01 AM PDT           12.28            381         0      Not Applicable
  04/24/2026 02 AM PDT           12.27            372         -      Not Applicable
  04/24/2026 03 AM PDT           12.27            372         0      Not Applicable
  04/24/2026 04 AM PDT           12.27            372         0      Not Applicable
  04/24/2026 05 AM PDT           12.27            372         0      Not Applicable
  04/24/2026 06 AM PDT           12.27            372         0      Not Applicable
  04/24/2026 07 AM PDT           12.27            372         0      Not Applicable
  04/24/2026 08 AM PDT           12.27            372         0      Not Applicable
  04/24/2026 09 AM PDT           12.27            372         0      Not Applicable
  04/24/2026 10 AM PDT           12.27            372         0      Not Applicable
  04/24/2026 11 AM PDT           12.27            372         0      Not Applicable
  04/24/2026 12 PM PDT           12.27            372         0      Not Applicable
  04/24/2026 01 PM PDT           12.27            372         0      Not Applicable
  04/24/2026 02 PM PDT           12.27            372         0      Not Applicable
  04/24/2026 03 PM PDT           12.27            372         0      Not Applicable
  04/24/2026 04 PM PDT           12.27            372         0      Not Applicable
  04/24/2026 05 PM PDT           12.27            372         0      Not Applicable
  04/24/2026 06 PM PDT           12.26            364         -      Not Applicable
  04/24/2026 07 PM PDT           12.26            364         0      Not Applicable
  04/24/2026 08 PM PDT           12.26            364         0      Not Applicable
  04/24/2026 09 PM PDT           12.26            364         0      Not Applicable
  04/24/2026 10 PM PDT           12.26            364         0      Not Applicable
  04/24/2026 11 PM PDT           12.25            355         -      Not Applicable
  04/25/2026 12 AM PDT           12.25            355         0      Not Applicable
  04/25/2026 01 AM PDT           12.25            355         0      Not Applicable
  04/25/2026 02 AM PDT           12.25            355         0      Not Applicable
  04/25/2026 03 AM PDT           12.24            346         -      Not Applicable
  04/25/2026 04 AM PDT           12.25            355         +      Not Applicable
  04/25/2026 05 AM PDT           12.25            355         0      Not Applicable
  04/25/2026 06 AM PDT           12.25            355         0      Not Applicable
  04/25/2026 07 AM PDT           12.25            355         0      Not Applicable
  04/25/2026 08 AM PDT           12.25            355         0      Not Applicable
  04/25/2026 09 AM PDT           12.24            346         -      Not Applicable
  04/25/2026 10 AM PDT           12.24            346         0      Not Applicable
  04/25/2026 11 AM PDT           12.24            346         0      Not Applicable
  04/25/2026 12 PM PDT           12.24            346         0      Not Applicable
  04/25/2026 01 PM PDT           12.24            346         0      Not Applicable
  04/25/2026 02 PM PDT           12.24            346         0      Not Applicable
  04/25/2026 03 PM PDT           12.24            346         0      Not Applicable
  04/25/2026 04 PM PDT           12.24            346         0      Not Applicable
  04/25/2026 05 PM PDT           12.24            346         0      Not Applicable
  04/25/2026 06 PM PDT           12.24            346         0      Not Applicable
  04/25/2026 07 PM PDT           12.23            338         -      Not Applicable
  04/25/2026 08 PM PDT           12.24            346         +      Not Applicable
  04/25/2026 09 PM PDT           12.23            338         -      Not Applicable
  04/25/2026 10 PM PDT           12.23            338         0      Not Applicable
  04/25/2026 11 PM PDT           12.23            338         0      Not Applicable
  04/26/2026 12 AM PDT           12.23            338         0      Not Applicable
  04/26/2026 01 AM PDT           12.23            338         0      Not Applicable
  04/26/2026 02 AM PDT           12.23            338         0      Not Applicable
  04/26/2026 03 AM PDT           12.23            338         0      Not Applicable
  04/26/2026 04 AM PDT           12.22            330         -      Not Applicable
  04/26/2026 05 AM PDT           12.23            338         +      Not Applicable
  04/26/2026 06 AM PDT           12.22            330         -      Not Applicable
  04/26/2026 07 AM PDT           12.22            330         0      Not Applicable
  04/26/2026 08 AM PDT           12.22            330         0      Not Applicable
  04/26/2026 09 AM PDT           12.22            330         0      Not Applicable
  04/26/2026 10 AM PDT           12.22            330         0      Not Applicable
  04/26/2026 11 AM PDT           12.22            330         0      Not Applicable
  04/26/2026 12 PM PDT           12.22            330         0      Not Applicable
  04/26/2026 01 PM PDT           12.22            330         0      Not Applicable
  04/26/2026 02 PM PDT           12.22            330         0      Not Applicable
  04/26/2026 03 PM PDT           12.22            330         0      Not Applicable
  04/26/2026 04 PM PDT           12.22            330         0      Not Applicable
  04/26/2026 05 PM PDT           12.22            330         0      Not Applicable
  04/26/2026 06 PM PDT           12.22            330         0      Not Applicable
  04/26/2026 07 PM PDT           12.22            330         0      Not Applicable
  04/26/2026 08 PM PDT           12.21            322         -      Not Applicable
  04/26/2026 09 PM PDT           12.21            322         0      Not Applicable
  04/26/2026 10 PM PDT           12.21            322         0      Not Applicable
  04/26/2026 11 PM PDT           12.21            322         0      Not Applicable
  04/27/2026 12 AM PDT           12.21            322         0      Not Applicable
  04/27/2026 01 AM PDT           12.20            314         -      Not Applicable
  04/27/2026 02 AM PDT           12.20            314         0      Not Applicable
  04/27/2026 03 AM PDT           12.21            322         +      Not Applicable
  04/27/2026 04 AM PDT           12.20            314         -      Not Applicable
  04/27/2026 05 AM PDT           12.20            314         0      Not Applicable
  04/27/2026 06 AM PDT           12.20            314         0      Not Applicable
  04/27/2026 07 AM PDT           12.20            314         0      Not Applicable
  04/27/2026 08 AM PDT           12.20            314         0      Not Applicable
  04/27/2026 09 AM PDT           12.20            314         0      Not Applicable
  04/27/2026 10 AM PDT           12.20            314         0      Not Applicable
  04/27/2026 11 AM PDT           12.20            314         0      Not Applicable
  04/27/2026 12 PM PDT           12.20            314         0      Not Applicable
  04/27/2026 01 PM PDT           12.20            314         0      Not Applicable
  04/27/2026 02 PM PDT           12.20            314         0      Not Applicable
  04/27/2026 03 PM PDT           12.19            306         -      Not Applicable
  04/27/2026 04 PM PDT           12.19            306         0      Not Applicable
  04/27/2026 05 PM PDT           12.19            306         0      Not Applicable
  04/27/2026 06 PM PDT           12.19            306         0      Not Applicable
  04/27/2026 07 PM PDT           12.19            306         0      Not Applicable
  04/27/2026 08 PM PDT           12.19            306         0      Not Applicable
  04/27/2026 09 PM PDT           12.18            298         -      Not Applicable
  04/27/2026 10 PM PDT           12.18            298         0      Not Applicable
  04/27/2026 11 PM PDT           12.18            298         0      Not Applicable
  04/28/2026 12 AM PDT           12.17            291         -      Not Applicable
  04/28/2026 01 AM PDT           12.18            298         +      Not Applicable
  04/28/2026 02 AM PDT           12.18            298         0      Not Applicable
  04/28/2026 03 AM PDT           12.18            298         0      Not Applicable
  04/28/2026 04 AM PDT           12.18            298         0      Not Applicable
  04/28/2026 05 AM PDT           12.18            298         0      Not Applicable
  04/28/2026 06 AM PDT           12.18            298         0      Not Applicable
  04/28/2026 07 AM PDT           12.18            298         0      Not Applicable
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  04/28/2026 08 AM PDT           12.18            298                Not Applicable
  04/28/2026 09 AM PDT           12.18            298         0      Not Applicable
  04/28/2026 10 AM PDT           12.18            298         0      Not Applicable
  04/28/2026 11 AM PDT           12.18            298         0      Not Applicable
  04/28/2026 12 PM PDT           12.18            298         0      Not Applicable
  04/28/2026 01 PM PDT           12.18            298         0      Not Applicable
  04/28/2026 02 PM PDT           12.17            291         -      Not Applicable
  04/28/2026 03 PM PDT           12.17            291         0      Not Applicable
  04/28/2026 04 PM PDT           12.17            291         0      Not Applicable
  04/28/2026 05 PM PDT           12.17            291         0      Not Applicable
  04/28/2026 06 PM PDT           12.17            291         0      Not Applicable
  04/28/2026 07 PM PDT           12.17            291         0      Not Applicable
  04/28/2026 08 PM PDT           12.17            291         0      Not Applicable
  04/28/2026 09 PM PDT           12.17            291         0      Not Applicable
  04/28/2026 10 PM PDT           12.17            291         0      Not Applicable
  04/28/2026 11 PM PDT           12.17            291         0      Not Applicable
  04/29/2026 12 AM PDT           12.17            291         0      Not Applicable
  04/29/2026 01 AM PDT           12.17            291         0      Not Applicable
  04/29/2026 02 AM PDT           12.17            291         0      Not Applicable
  04/29/2026 03 AM PDT           12.16            283         -      Not Applicable
  04/29/2026 04 AM PDT           12.16            283         0      Not Applicable
  04/29/2026 05 AM PDT           12.16            283         0      Not Applicable
  04/29/2026 06 AM PDT           12.16            283         0      Not Applicable
  04/29/2026 07 AM PDT           12.16            283         0      Not Applicable
  04/29/2026 08 AM PDT           12.16            283         0      Not Applicable
  04/29/2026 09 AM PDT           12.16            283         0      Not Applicable
  04/29/2026 10 AM PDT           12.16            283         0      Not Applicable
  04/29/2026 11 AM PDT           12.16            283         0      Not Applicable
  04/29/2026 12 PM PDT           12.16            283         0      Not Applicable
  04/29/2026 01 PM PDT           12.16            283         0      Not Applicable
  04/29/2026 02 PM PDT           12.16            283         0      Not Applicable
  04/29/2026 03 PM PDT           12.16            283         0      Not Applicable
  04/29/2026 04 PM PDT           12.16            283         0      Not Applicable
  04/29/2026 05 PM PDT           12.16            283         0      Not Applicable
  04/29/2026 06 PM PDT           12.16            283         0      Not Applicable
  04/29/2026 07 PM PDT           12.15            276         -      Not Applicable
  04/29/2026 08 PM PDT           12.15            276         0      Not Applicable
  04/29/2026 09 PM PDT           12.15            276         0      Not Applicable
  04/29/2026 10 PM PDT           12.15            276         0      Not Applicable
  04/29/2026 11 PM PDT           12.15            276         0      Not Applicable
  04/30/2026 12 AM PDT           12.15            276         0      Not Applicable
  04/30/2026 01 AM PDT           12.15            276         0      Not Applicable
  04/30/2026 02 AM PDT           12.15            276         0      Not Applicable
  04/30/2026 03 AM PDT           12.15            276         0      Not Applicable
  04/30/2026 04 AM PDT           12.15            276         0      Not Applicable
  04/30/2026 05 AM PDT           12.15            276         0      Not Applicable
  04/30/2026 06 AM PDT           12.15            276         0      Not Applicable
  04/30/2026 07 AM PDT           12.15            276         0      Not Applicable
  04/30/2026 08 AM PDT           12.15            276         0      Not Applicable
  04/30/2026 09 AM PDT           12.15            276         0      Not Applicable
  04/30/2026 10 AM PDT           12.15            276         0      Not Applicable
  04/30/2026 11 AM PDT           12.15            276         0      Not Applicable
  04/30/2026 12 PM PDT           12.15            276         0      Not Applicable
  04/30/2026 01 PM PDT           12.14            269         -      Not Applicable
  04/30/2026 02 PM PDT           12.14            269         0      Not Applicable
  04/30/2026 03 PM PDT           12.14            269         0      Not Applicable
  04/30/2026 04 PM PDT           12.14            269         0      Not Applicable
  04/30/2026 05 PM PDT           12.14            269         0      Not Applicable
  04/30/2026 06 PM PDT           12.14            269         0      Not Applicable
  04/30/2026 07 PM PDT           12.14            269         0      Not Applicable
  04/30/2026 08 PM PDT           12.14            269         0      Not Applicable
  04/30/2026 09 PM PDT           12.14            269         0      Not Applicable
  04/30/2026 10 PM PDT           12.14            269         0      Not Applicable
  04/30/2026 11 PM PDT           12.14            269         0      Not Applicable
  05/01/2026 12 AM PDT           12.14            269         0      Not Applicable
  05/01/2026 01 AM PDT           12.14            269         0      Not Applicable
  05/01/2026 02 AM PDT           12.14            269         0      Not Applicable
  05/01/2026 03 AM PDT           12.14            269         0      Not Applicable
  05/01/2026 04 AM PDT           12.14            269         0      Not Applicable
  05/01/2026 05 AM PDT           12.14            269         0      Not Applicable
  05/01/2026 06 AM PDT           12.14            269         0      Not Applicable
  05/01/2026 07 AM PDT           12.13            262         -      Not Applicable
  05/01/2026 08 AM PDT           12.13            262         0      Not Applicable
  05/01/2026 09 AM PDT           12.13            262         0      Not Applicable
  05/01/2026 10 AM PDT           12.13            262         0      Not Applicable
  05/01/2026 11 AM PDT           12.13            262         0      Not Applicable
  05/01/2026 12 PM PDT           12.13            262         0      Not Applicable
  05/01/2026 01 PM PDT           12.13            262         0      Not Applicable
  05/01/2026 02 PM PDT           12.13            262         0      Not Applicable
  05/01/2026 03 PM PDT           12.13            262         0      Not Applicable
  05/01/2026 04 PM PDT           12.13            262         0      Not Applicable
  05/01/2026 05 PM PDT           12.13            262         0      Not Applicable
  05/01/2026 06 PM PDT           12.13            262         0      Not Applicable
  05/01/2026 07 PM PDT           12.13            262         0      Not Applicable
  05/01/2026 08 PM PDT           12.13            262         0      Not Applicable
  05/01/2026 09 PM PDT           12.13            262         0      Not Applicable
  05/01/2026 10 PM PDT           12.13            262         0      Not Applicable
  05/01/2026 11 PM PDT           12.13            262         0      Not Applicable
  05/02/2026 12 AM PDT           12.13            262         0      Not Applicable
  05/02/2026 01 AM PDT           12.13            262         0      Not Applicable
  05/02/2026 02 AM PDT           12.12            255         -      Not Applicable
  05/02/2026 03 AM PDT           12.12            255         0      Not Applicable
  05/02/2026 04 AM PDT           12.12            255         0      Not Applicable
  05/02/2026 05 AM PDT           12.12            255         0      Not Applicable
  05/02/2026 06 AM PDT           12.12            255         0      Not Applicable
  05/02/2026 07 AM PDT           12.12            255         0      Not Applicable
  05/02/2026 08 AM PDT           12.12            255         0      Not Applicable
  05/02/2026 09 AM PDT           12.12            255         0      Not Applicable
  05/02/2026 10 AM PDT           12.12            255         0      Not Applicable
  05/02/2026 11 AM PDT           12.12            255         0      Not Applicable
  05/02/2026 12 PM PDT           12.12            255         0      Not Applicable
  05/02/2026 01 PM PDT           12.12            255         0      Not Applicable
  05/02/2026 02 PM PDT           12.12            255         0      Not Applicable
  05/02/2026 03 PM PDT           12.12            255         0      Not Applicable
  05/02/2026 04 PM PDT           12.12            255         0      Not Applicable
  05/02/2026 05 PM PDT           12.12            255         0      Not Applicable
  05/02/2026 06 PM PDT           12.12            255         0      Not Applicable
  05/02/2026 07 PM PDT           12.12            255         0      Not Applicable
  05/02/2026 08 PM PDT           12.12            255         0      Not Applicable
  05/02/2026 09 PM PDT           12.12            255         0      Not Applicable
  05/02/2026 10 PM PDT           12.12            255         0      Not Applicable
  05/02/2026 11 PM PDT           12.12            255         0      Not Applicable
  05/03/2026 12 AM PDT           12.12            255         0      Not Applicable
  05/03/2026 01 AM PDT           12.11            248         -      Not Applicable
  05/03/2026 02 AM PDT           12.11            248         0      Not Applicable
  05/03/2026 03 AM PDT           12.11            248         0      Not Applicable
  05/03/2026 04 AM PDT           12.11            248         0      Not Applicable
  05/03/2026 05 AM PDT           12.11            248         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.