MAD RIVER - ARCATA (ARCC1)
Latitude: 40.91º NLongitude: 124.06º WElevation: 13 Feet
Location: Humboldt County in CaliforniaBulletin Group: North CoastRiver Group: North Coast
Issuance Time: Dec 04 2025 at 1:11 PM PSTNext Issuance: Dec 05 2025 at 9:00 AM PST
Action/Monitor: 15.0 FeetMinor Flood: 22.0 FeetModerate Flood: 24.0 FeetMajor Flood: 28.0 Feet

# Tabular Observed and Forecast Hydrograph Information
#
# Location: Mad River - Arcata (ARCC1)
#
# File Generation Time:  12/04/2025 at 01:11 PM PST
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  11/30/2025 at 04:00 AM PST
# Maximum Observed Stage:                       6.24 Feet
# Maximum Observed Flow:                        216 cfs
#
# Earliest Date & Time of Maximum Forecast:     12/04/2025 at 02:00 PM PST
# Maximum Forecast Stage:                       5.96 Feet
# Maximum Forecast Flow:                        141 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  11/29/2025 01 PM PST            6.21            207                        Normal
  11/29/2025 02 PM PST            6.18            198         -              Normal
  11/29/2025 03 PM PST            6.20            204         +              Normal
  11/29/2025 04 PM PST            6.18            198         -              Normal
  11/29/2025 05 PM PST            6.19            201         +              Normal
  11/29/2025 06 PM PST            6.20            204         +              Normal
  11/29/2025 07 PM PST            6.20            204         0              Normal
  11/29/2025 08 PM PST            6.21            207         +              Normal
  11/29/2025 09 PM PST            6.19            201         -              Normal
  11/29/2025 10 PM PST            6.19            201         0              Normal
  11/29/2025 11 PM PST            6.16            192         -              Normal
  11/30/2025 12 AM PST            6.15            190         -              Normal
  11/30/2025 01 AM PST            6.15            190         0              Normal
  11/30/2025 02 AM PST            6.15            190         0              Normal
  11/30/2025 03 AM PST            6.16            192         +              Normal
  11/30/2025 04 AM PST            6.24            216         +              Normal
  11/30/2025 05 AM PST            6.15            190         -              Normal
  11/30/2025 06 AM PST            6.15            190         0              Normal
  11/30/2025 07 AM PST            6.15            190         0              Normal
  11/30/2025 08 AM PST            6.16            192         +              Normal
  11/30/2025 09 AM PST            6.16            192         0              Normal
  11/30/2025 10 AM PST            6.13            184         -              Normal
  11/30/2025 11 AM PST            6.14            187         +              Normal
  11/30/2025 12 PM PST            6.14            187         0              Normal
  11/30/2025 01 PM PST            6.13            184         -              Normal
  11/30/2025 02 PM PST            6.12            181         -              Normal
  11/30/2025 03 PM PST            6.11            179         -              Normal
  11/30/2025 04 PM PST            6.12            181         +              Normal
  11/30/2025 05 PM PST            6.14            187         +              Normal
  11/30/2025 06 PM PST            6.16            192         +              Normal
  11/30/2025 07 PM PST            6.15            190         -              Normal
  11/30/2025 08 PM PST            6.13            184         -              Normal
  11/30/2025 09 PM PST            6.13            184         0              Normal
  11/30/2025 10 PM PST            6.14            187         +              Normal
  11/30/2025 11 PM PST            6.13            184         -              Normal
  12/01/2025 12 AM PST            6.11            179         -              Normal
  12/01/2025 01 AM PST            6.10            176         -              Normal
  12/01/2025 02 AM PST            6.08            171         -              Normal
  12/01/2025 03 AM PST            6.08            171         0              Normal
  12/01/2025 04 AM PST            6.08            171         0              Normal
  12/01/2025 05 AM PST            6.09            173         +              Normal
  12/01/2025 06 AM PST            6.13            184         +              Normal
  12/01/2025 07 AM PST            6.08            171         -              Normal
  12/01/2025 08 AM PST            6.08            171         0              Normal
  12/01/2025 09 AM PST            6.08            171         0              Normal
  12/01/2025 10 AM PST            6.07            168         -              Normal
  12/01/2025 11 AM PST            6.07            168         0              Normal
  12/01/2025 12 PM PST            6.08            171         +              Normal
  12/01/2025 01 PM PST            6.08            171         0              Normal
  12/01/2025 02 PM PST            6.08            171         0              Normal
  12/01/2025 03 PM PST            6.08            171         0              Normal
  12/01/2025 04 PM PST            6.08            171         0              Normal
  12/01/2025 05 PM PST            6.09            173         +              Normal
  12/01/2025 06 PM PST            6.10            176         +              Normal
  12/01/2025 07 PM PST            6.10            176         0              Normal
  12/01/2025 08 PM PST            6.10            176         0              Normal
  12/01/2025 09 PM PST            6.10            176         0              Normal
  12/01/2025 10 PM PST            6.09            173         -              Normal
  12/01/2025 11 PM PST            6.08            171         -              Normal
  12/02/2025 12 AM PST            6.07            168         -              Normal
  12/02/2025 01 AM PST            6.06            165         -              Normal
  12/02/2025 02 AM PST            6.07            168         +              Normal
  12/02/2025 03 AM PST            6.07            168         0              Normal
  12/02/2025 04 AM PST            6.07            168         0              Normal
  12/02/2025 05 AM PST            6.07            168         0              Normal
  12/02/2025 06 AM PST            6.07            168         0              Normal
  12/02/2025 07 AM PST            6.07            168         0              Normal
  12/02/2025 08 AM PST            6.06            165         -              Normal
  12/02/2025 09 AM PST            6.06            165         0              Normal
  12/02/2025 10 AM PST            6.06            165         0              Normal
  12/02/2025 11 AM PST            6.08            171         +              Normal
  12/02/2025 12 PM PST            6.07            168         -              Normal
  12/02/2025 01 PM PST            6.08            171         +              Normal
  12/02/2025 02 PM PST            6.08            171         0              Normal
  12/02/2025 03 PM PST            6.09            173         +              Normal
  12/02/2025 04 PM PST            6.09            173         0              Normal
  12/02/2025 05 PM PST            6.06            165         -              Normal
  12/02/2025 06 PM PST            6.06            165         0              Normal
  12/02/2025 07 PM PST            6.09            173         +              Normal
  12/02/2025 08 PM PST            6.09            173         0              Normal
  12/02/2025 09 PM PST            6.09            173         0              Normal
  12/02/2025 10 PM PST            6.07            168         -              Normal
  12/02/2025 11 PM PST            6.04            160         -              Normal
  12/03/2025 12 AM PST            6.03            158         -              Normal
  12/03/2025 01 AM PST            6.02            155         -              Normal
  12/03/2025 02 AM PST            6.02            155         0              Normal
  12/03/2025 03 AM PST            6.02            155         0              Normal
  12/03/2025 04 AM PST            6.03            158         +              Normal
  12/03/2025 05 AM PST            6.03            158         0              Normal
  12/03/2025 06 AM PST            6.02            155         -              Normal
  12/03/2025 07 AM PST            6.02            155         0              Normal
  12/03/2025 08 AM PST            6.01            153         -              Normal
  12/03/2025 09 AM PST            6.01            153         0              Normal
  12/03/2025 10 AM PST            6.00            150         -              Normal
  12/03/2025 11 AM PST            6.00            150         0              Normal
  12/03/2025 12 PM PST            6.00            150         0              Normal
  12/03/2025 01 PM PST            6.00            150         0              Normal
  12/03/2025 02 PM PST            6.01            153         +              Normal
  12/03/2025 03 PM PST            6.00            150         -              Normal
  12/03/2025 04 PM PST            5.98            146         -              Normal
  12/03/2025 05 PM PST            6.01            153         +              Normal
  12/03/2025 06 PM PST            6.02            155         +              Normal
  12/03/2025 07 PM PST            6.03            158         +              Normal
  12/03/2025 08 PM PST            6.03            158         0              Normal
  12/03/2025 09 PM PST            6.03            158         0              Normal
  12/03/2025 10 PM PST            6.03            158         0              Normal
  12/03/2025 11 PM PST            6.01            153         -              Normal
  12/04/2025 12 AM PST            6.00            150         -              Normal
  12/04/2025 01 AM PST            6.00            150         0              Normal
  12/04/2025 02 AM PST            5.99            148         -              Normal
  12/04/2025 03 AM PST            5.98            146         -              Normal
  12/04/2025 04 AM PST            5.98            146         0              Normal
  12/04/2025 05 AM PST            5.99            148         +              Normal
  12/04/2025 06 AM PST            5.99            148         0              Normal
  12/04/2025 07 AM PST            6.00            150         +              Normal
  12/04/2025 08 AM PST            6.00            150         0              Normal
  12/04/2025 09 AM PST            5.98            146         -              Normal
  12/04/2025 10 AM PST            5.97            143         -              Normal
  12/04/2025 11 AM PST            5.97            143         0              Normal
  12/04/2025 12 PM PST            5.97            143         0              Normal
  12/04/2025 01 PM PST            5.97            143         0              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  12/04/2025 02 PM PST            5.96            141                        Normal
  12/04/2025 03 PM PST            5.96            141         0              Normal
  12/04/2025 04 PM PST            5.96            141         0              Normal
  12/04/2025 05 PM PST            5.96            141         0              Normal
  12/04/2025 06 PM PST            5.96            141         0              Normal
  12/04/2025 07 PM PST            5.96            141         0              Normal
  12/04/2025 08 PM PST            5.95            139         -              Normal
  12/04/2025 09 PM PST            5.95            139         0              Normal
  12/04/2025 10 PM PST            5.95            139         0              Normal
  12/04/2025 11 PM PST            5.95            139         0              Normal
  12/05/2025 12 AM PST            5.95            139         0              Normal
  12/05/2025 01 AM PST            5.95            139         0              Normal
  12/05/2025 02 AM PST            5.95            139         0              Normal
  12/05/2025 03 AM PST            5.94            136         -              Normal
  12/05/2025 04 AM PST            5.94            136         0              Normal
  12/05/2025 05 AM PST            5.94            136         0              Normal
  12/05/2025 06 AM PST            5.94            136         0              Normal
  12/05/2025 07 AM PST            5.94            136         0              Normal
  12/05/2025 08 AM PST            5.94            136         0              Normal
  12/05/2025 09 AM PST            5.94            136         0              Normal
  12/05/2025 10 AM PST            5.93            134         -              Normal
  12/05/2025 11 AM PST            5.93            134         0              Normal
  12/05/2025 12 PM PST            5.93            134         0              Normal
  12/05/2025 01 PM PST            5.93            134         0              Normal
  12/05/2025 02 PM PST            5.93            134         0              Normal
  12/05/2025 03 PM PST            5.93            134         0              Normal
  12/05/2025 04 PM PST            5.93            134         0              Normal
  12/05/2025 05 PM PST            5.93            134         0              Normal
  12/05/2025 06 PM PST            5.92            132         -              Normal
  12/05/2025 07 PM PST            5.92            132         0              Normal
  12/05/2025 08 PM PST            5.92            132         0              Normal
  12/05/2025 09 PM PST            5.92            132         0              Normal
  12/05/2025 10 PM PST            5.92            132         0              Normal
  12/05/2025 11 PM PST            5.92            132         0              Normal
  12/06/2025 12 AM PST            5.92            132         0              Normal
  12/06/2025 01 AM PST            5.92            132         0              Normal
  12/06/2025 02 AM PST            5.92            132         0              Normal
  12/06/2025 03 AM PST            5.91            129         -              Normal
  12/06/2025 04 AM PST            5.91            129         0              Normal
  12/06/2025 05 AM PST            5.91            129         0              Normal
  12/06/2025 06 AM PST            5.91            129         0              Normal
  12/06/2025 07 AM PST            5.91            129         0              Normal
  12/06/2025 08 AM PST            5.91            129         0              Normal
  12/06/2025 09 AM PST            5.91            129         0              Normal
  12/06/2025 10 AM PST            5.91            129         0              Normal
  12/06/2025 11 AM PST            5.91            129         0              Normal
  12/06/2025 12 PM PST            5.91            129         0              Normal
  12/06/2025 01 PM PST            5.91            129         0              Normal
  12/06/2025 02 PM PST            5.91            129         0              Normal
  12/06/2025 03 PM PST            5.90            127         -              Normal
  12/06/2025 04 PM PST            5.90            127         0              Normal
  12/06/2025 05 PM PST            5.90            127         0              Normal
  12/06/2025 06 PM PST            5.90            127         0              Normal
  12/06/2025 07 PM PST            5.90            127         0              Normal
  12/06/2025 08 PM PST            5.90            127         0              Normal
  12/06/2025 09 PM PST            5.90            127         0              Normal
  12/06/2025 10 PM PST            5.89            125         -              Normal
  12/06/2025 11 PM PST            5.89            125         0              Normal
  12/07/2025 12 AM PST            5.89            125         0              Normal
  12/07/2025 01 AM PST            5.89            125         0              Normal
  12/07/2025 02 AM PST            5.89            125         0              Normal
  12/07/2025 03 AM PST            5.89            125         0              Normal
  12/07/2025 04 AM PST            5.89            125         0              Normal
  12/07/2025 05 AM PST            5.89            125         0              Normal
  12/07/2025 06 AM PST            5.88            123         -              Normal
  12/07/2025 07 AM PST            5.88            123         0              Normal
  12/07/2025 08 AM PST            5.88            123         0              Normal
  12/07/2025 09 AM PST            5.88            123         0              Normal
  12/07/2025 10 AM PST            5.88            123         0              Normal
  12/07/2025 11 AM PST            5.88            123         0              Normal
  12/07/2025 12 PM PST            5.88            123         0              Normal
  12/07/2025 01 PM PST            5.88            123         0              Normal
  12/07/2025 02 PM PST            5.88            123         0              Normal
  12/07/2025 03 PM PST            5.87            121         -              Normal
  12/07/2025 04 PM PST            5.87            121         0              Normal
  12/07/2025 05 PM PST            5.87            121         0              Normal
  12/07/2025 06 PM PST            5.87            121         0              Normal
  12/07/2025 07 PM PST            5.87            121         0              Normal
  12/07/2025 08 PM PST            5.87            121         0              Normal
  12/07/2025 09 PM PST            5.87            121         0              Normal
  12/07/2025 10 PM PST            5.87            121         0              Normal
  12/07/2025 11 PM PST            5.87            121         0              Normal
  12/08/2025 12 AM PST            5.87            121         0              Normal
  12/08/2025 01 AM PST            5.86            119         -              Normal
  12/08/2025 02 AM PST            5.86            119         0              Normal
  12/08/2025 03 AM PST            5.86            119         0              Normal
  12/08/2025 04 AM PST            5.86            119         0              Normal
  12/08/2025 05 AM PST            5.86            119         0              Normal
  12/08/2025 06 AM PST            5.86            119         0              Normal
  12/08/2025 07 AM PST            5.86            119         0              Normal
  12/08/2025 08 AM PST            5.86            119         0              Normal
  12/08/2025 09 AM PST            5.86            119         0              Normal
  12/08/2025 10 AM PST            5.85            116         -              Normal
  12/08/2025 11 AM PST            5.85            116         0              Normal
  12/08/2025 12 PM PST            5.85            116         0              Normal
  12/08/2025 01 PM PST            5.85            116         0              Normal
  12/08/2025 02 PM PST            5.85            116         0              Normal
  12/08/2025 03 PM PST            5.85            116         0              Normal
  12/08/2025 04 PM PST            5.85            116         0              Normal
  12/08/2025 05 PM PST            5.85            116         0              Normal
  12/08/2025 06 PM PST            5.85            116         0              Normal
  12/08/2025 07 PM PST            5.84            114         -              Normal
  12/08/2025 08 PM PST            5.84            114         0              Normal
  12/08/2025 09 PM PST            5.84            114         0              Normal
  12/08/2025 10 PM PST            5.84            114         0              Normal
  12/08/2025 11 PM PST            5.84            114         0              Normal
  12/09/2025 12 AM PST            5.84            114         0              Normal
  12/09/2025 01 AM PST            5.84            114         0              Normal
  12/09/2025 02 AM PST            5.84            114         0              Normal
  12/09/2025 03 AM PST            5.84            114         0              Normal
  12/09/2025 04 AM PST            5.84            114         0              Normal
#
# 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.