National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

 | 

MAD RIVER - ARCATA (ARCC1)
Latitude: 40.91º NLongitude: 124.06º WElevation: 13 FeetForecast Type: Official Location
Location: Humboldt County in CaliforniaBulletin Group: North CoastRiver Group: North Coast
Issuance Time: Mar 27 2026 at 12:45 PM PDTNext Issuance: Mar 28 2026 at 9:00 AM PDT
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:  03/27/2026 at 12:45 PM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  03/22/2026 at 08:00 PM PDT
# Maximum Observed Stage:                       7.08 Feet
# Maximum Observed Flow:                        378 cfs
#
# Earliest Date & Time of Maximum Forecast:     03/27/2026 at 01:00 PM PDT
# Maximum Forecast Stage:                       6.91 Feet
# Maximum Forecast Flow:                        308 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  03/22/2026 12 PM PDT            7.08            378                        Normal
  03/22/2026 01 PM PDT            7.07            374         -              Normal
  03/22/2026 02 PM PDT            7.07            374         0              Normal
  03/22/2026 03 PM PDT            7.07            374         0              Normal
  03/22/2026 04 PM PDT            7.06            369         -              Normal
  03/22/2026 05 PM PDT            7.08            378         +              Normal
  03/22/2026 06 PM PDT            7.08            378         0              Normal
  03/22/2026 07 PM PDT            7.07            374         -              Normal
  03/22/2026 08 PM PDT            7.08            378         +              Normal
  03/22/2026 09 PM PDT            7.07            374         -              Normal
  03/22/2026 10 PM PDT            7.06            369         -              Normal
  03/22/2026 11 PM PDT            7.05            365         -              Normal
  03/23/2026 12 AM PDT            7.04            361         -              Normal
  03/23/2026 01 AM PDT            7.04            361         0              Normal
  03/23/2026 02 AM PDT            7.03            357         -              Normal
  03/23/2026 03 AM PDT            7.04            361         +              Normal
  03/23/2026 04 AM PDT            7.02            352         -              Normal
  03/23/2026 05 AM PDT            7.03            357         +              Normal
  03/23/2026 06 AM PDT            7.02            352         -              Normal
  03/23/2026 07 AM PDT            7.02            352         0              Normal
  03/23/2026 08 AM PDT            7.01            348         -              Normal
  03/23/2026 09 AM PDT            7.01            348         0              Normal
  03/23/2026 10 AM PDT            7.01            348         0              Normal
  03/23/2026 11 AM PDT            7.01            348         0              Normal
  03/23/2026 12 PM PDT            7.01            348         0              Normal
  03/23/2026 01 PM PDT            7.01            348         0              Normal
  03/23/2026 02 PM PDT            7.01            348         0              Normal
  03/23/2026 03 PM PDT            7.02            352         +              Normal
  03/23/2026 04 PM PDT            7.03            357         +              Normal
  03/23/2026 05 PM PDT            7.02            352         -              Normal
  03/23/2026 06 PM PDT            7.03            357         +              Normal
  03/23/2026 07 PM PDT            7.02            352         -              Normal
  03/23/2026 08 PM PDT            7.02            352         0              Normal
  03/23/2026 09 PM PDT            7.02            352         0              Normal
  03/23/2026 10 PM PDT            7.01            348         -              Normal
  03/23/2026 11 PM PDT            7.01            348         0              Normal
  03/24/2026 12 AM PDT            7.00            344         -              Normal
  03/24/2026 01 AM PDT            6.99            340         -              Normal
  03/24/2026 02 AM PDT            6.99            340         0              Normal
  03/24/2026 03 AM PDT            6.98            336         -              Normal
  03/24/2026 04 AM PDT            6.98            336         0              Normal
  03/24/2026 05 AM PDT            6.99            340         +              Normal
  03/24/2026 06 AM PDT            6.97            332         -              Normal
  03/24/2026 07 AM PDT            6.98            336         +              Normal
  03/24/2026 08 AM PDT            6.98            336         0              Normal
  03/24/2026 09 AM PDT            6.97            332         -              Normal
  03/24/2026 10 AM PDT            6.97            332         0              Normal
  03/24/2026 11 AM PDT            6.97            332         0              Normal
  03/24/2026 12 PM PDT            6.97            332         0              Normal
  03/24/2026 01 PM PDT            6.98            336         +              Normal
  03/24/2026 02 PM PDT            6.97            332         -              Normal
  03/24/2026 03 PM PDT            6.97            332         0              Normal
  03/24/2026 04 PM PDT            6.98            336         +              Normal
  03/24/2026 05 PM PDT            6.98            336         0              Normal
  03/24/2026 06 PM PDT            6.99            340         +              Normal
  03/24/2026 07 PM PDT            6.98            336         -              Normal
  03/24/2026 08 PM PDT            6.98            336         0              Normal
  03/24/2026 09 PM PDT            6.98            336         0              Normal
  03/24/2026 10 PM PDT            6.97            332         -              Normal
  03/24/2026 11 PM PDT            6.98            336         +              Normal
  03/25/2026 12 AM PDT            6.95            324         -              Normal
  03/25/2026 01 AM PDT            6.95            324         0              Normal
  03/25/2026 02 AM PDT            6.94            320         -              Normal
  03/25/2026 03 AM PDT            6.93            316         -              Normal
  03/25/2026 04 AM PDT            6.94            320         +              Normal
  03/25/2026 05 AM PDT            6.93            316         -              Normal
  03/25/2026 06 AM PDT            6.93            316         0              Normal
  03/25/2026 07 AM PDT            6.93            316         0              Normal
  03/25/2026 08 AM PDT            6.93            316         0              Normal
  03/25/2026 09 AM PDT            6.94            320         +              Normal
  03/25/2026 10 AM PDT            6.93            316         -              Normal
  03/25/2026 11 AM PDT            6.92            312         -              Normal
  03/25/2026 12 PM PDT            6.93            316         +              Normal
  03/25/2026 01 PM PDT            6.93            316         0              Normal
  03/25/2026 02 PM PDT            6.94            320         +              Normal
  03/25/2026 03 PM PDT            6.93            316         -              Normal
  03/25/2026 04 PM PDT            6.93            316         0              Normal
  03/25/2026 05 PM PDT            6.94            320         +              Normal
  03/25/2026 06 PM PDT            6.94            320         0              Normal
  03/25/2026 07 PM PDT            6.93            316         -              Normal
  03/25/2026 08 PM PDT            6.94            320         +              Normal
  03/25/2026 09 PM PDT            6.94            320         0              Normal
  03/25/2026 10 PM PDT            6.94            320         0              Normal
  03/25/2026 11 PM PDT            6.94            320         0              Normal
  03/26/2026 12 AM PDT            6.97            332         +              Normal
  03/26/2026 01 AM PDT            6.99            340         +              Normal
  03/26/2026 02 AM PDT            7.01            348         +              Normal
  03/26/2026 03 AM PDT            7.01            348         0              Normal
  03/26/2026 04 AM PDT            7.01            348         0              Normal
  03/26/2026 05 AM PDT            7.00            344         -              Normal
  03/26/2026 06 AM PDT            7.00            344         0              Normal
  03/26/2026 07 AM PDT            7.00            344         0              Normal
  03/26/2026 08 AM PDT            6.99            340         -              Normal
  03/26/2026 09 AM PDT            6.99            340         0              Normal
  03/26/2026 10 AM PDT            6.98            336         -              Normal
  03/26/2026 11 AM PDT            6.98            336         0              Normal
  03/26/2026 12 PM PDT            6.99            340         +              Normal
  03/26/2026 01 PM PDT            6.99            340         0              Normal
  03/26/2026 02 PM PDT            6.98            336         -              Normal
  03/26/2026 03 PM PDT            6.98            336         0              Normal
  03/26/2026 04 PM PDT            6.99            340         +              Normal
  03/26/2026 05 PM PDT            6.99            340         0              Normal
  03/26/2026 06 PM PDT            7.00            344         +              Normal
  03/26/2026 07 PM PDT            6.98            336         -              Normal
  03/26/2026 08 PM PDT            6.98            336         0              Normal
  03/26/2026 09 PM PDT            6.98            336         0              Normal
  03/26/2026 10 PM PDT            6.97            332         -              Normal
  03/26/2026 11 PM PDT            6.96            328         -              Normal
  03/27/2026 12 AM PDT            6.95            324         -              Normal
  03/27/2026 01 AM PDT            6.93            316         -              Normal
  03/27/2026 02 AM PDT            6.93            316         0              Normal
  03/27/2026 03 AM PDT            6.92            312         -              Normal
  03/27/2026 04 AM PDT            6.91            308         -              Normal
  03/27/2026 05 AM PDT            6.91            308         0              Normal
  03/27/2026 06 AM PDT            6.90            305         -              Normal
  03/27/2026 07 AM PDT            6.90            305         0              Normal
  03/27/2026 08 AM PDT            6.91            308         +              Normal
  03/27/2026 09 AM PDT            6.91            308         0              Normal
  03/27/2026 10 AM PDT            6.91            308         0              Normal
  03/27/2026 11 AM PDT            6.91            308         0              Normal
  03/27/2026 12 PM PDT            6.91            308         0              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  03/27/2026 01 PM PDT            6.91            308                        Normal
  03/27/2026 02 PM PDT            6.91            308         0              Normal
  03/27/2026 03 PM PDT            6.91            308         0              Normal
  03/27/2026 04 PM PDT            6.91            308         0              Normal
  03/27/2026 05 PM PDT            6.91            308         0              Normal
  03/27/2026 06 PM PDT            6.91            308         0              Normal
  03/27/2026 07 PM PDT            6.91            308         0              Normal
  03/27/2026 08 PM PDT            6.91            308         0              Normal
  03/27/2026 09 PM PDT            6.91            308         0              Normal
  03/27/2026 10 PM PDT            6.91            308         0              Normal
  03/27/2026 11 PM PDT            6.91            308         0              Normal
  03/28/2026 12 AM PDT            6.91            308         0              Normal
  03/28/2026 01 AM PDT            6.91            308         0              Normal
  03/28/2026 02 AM PDT            6.91            308         0              Normal
  03/28/2026 03 AM PDT            6.91            308         0              Normal
  03/28/2026 04 AM PDT            6.90            305         -              Normal
  03/28/2026 05 AM PDT            6.90            305         0              Normal
  03/28/2026 06 AM PDT            6.90            305         0              Normal
  03/28/2026 07 AM PDT            6.90            305         0              Normal
  03/28/2026 08 AM PDT            6.90            305         0              Normal
  03/28/2026 09 AM PDT            6.89            301         -              Normal
  03/28/2026 10 AM PDT            6.89            301         0              Normal
  03/28/2026 11 AM PDT            6.89            301         0              Normal
  03/28/2026 12 PM PDT            6.89            301         0              Normal
  03/28/2026 01 PM PDT            6.88            297         -              Normal
  03/28/2026 02 PM PDT            6.88            297         0              Normal
  03/28/2026 03 PM PDT            6.88            297         0              Normal
  03/28/2026 04 PM PDT            6.87            293         -              Normal
  03/28/2026 05 PM PDT            6.87            293         0              Normal
  03/28/2026 06 PM PDT            6.87            293         0              Normal
  03/28/2026 07 PM PDT            6.87            293         0              Normal
  03/28/2026 08 PM PDT            6.86            290         -              Normal
  03/28/2026 09 PM PDT            6.86            290         0              Normal
  03/28/2026 10 PM PDT            6.86            290         0              Normal
  03/28/2026 11 PM PDT            6.86            290         0              Normal
  03/29/2026 12 AM PDT            6.86            290         0              Normal
  03/29/2026 01 AM PDT            6.86            290         0              Normal
  03/29/2026 02 AM PDT            6.86            290         0              Normal
  03/29/2026 03 AM PDT            6.86            290         0              Normal
  03/29/2026 04 AM PDT            6.85            286         -              Normal
  03/29/2026 05 AM PDT            6.85            286         0              Normal
  03/29/2026 06 AM PDT            6.85            286         0              Normal
  03/29/2026 07 AM PDT            6.85            286         0              Normal
  03/29/2026 08 AM PDT            6.85            286         0              Normal
  03/29/2026 09 AM PDT            6.85            286         0              Normal
  03/29/2026 10 AM PDT            6.85            286         0              Normal
  03/29/2026 11 AM PDT            6.86            290         +              Normal
  03/29/2026 12 PM PDT            6.86            290         0              Normal
  03/29/2026 01 PM PDT            6.86            290         0              Normal
  03/29/2026 02 PM PDT            6.86            290         0              Normal
  03/29/2026 03 PM PDT            6.86            290         0              Normal
  03/29/2026 04 PM PDT            6.86            290         0              Normal
  03/29/2026 05 PM PDT            6.86            290         0              Normal
  03/29/2026 06 PM PDT            6.86            290         0              Normal
  03/29/2026 07 PM PDT            6.86            290         0              Normal
  03/29/2026 08 PM PDT            6.86            290         0              Normal
  03/29/2026 09 PM PDT            6.86            290         0              Normal
  03/29/2026 10 PM PDT            6.86            290         0              Normal
  03/29/2026 11 PM PDT            6.86            290         0              Normal
  03/30/2026 12 AM PDT            6.86            290         0              Normal
  03/30/2026 01 AM PDT            6.86            290         0              Normal
  03/30/2026 02 AM PDT            6.86            290         0              Normal
  03/30/2026 03 AM PDT            6.86            290         0              Normal
  03/30/2026 04 AM PDT            6.86            290         0              Normal
  03/30/2026 05 AM PDT            6.86            290         0              Normal
  03/30/2026 06 AM PDT            6.86            290         0              Normal
  03/30/2026 07 AM PDT            6.86            290         0              Normal
  03/30/2026 08 AM PDT            6.86            290         0              Normal
  03/30/2026 09 AM PDT            6.86            290         0              Normal
  03/30/2026 10 AM PDT            6.86            290         0              Normal
  03/30/2026 11 AM PDT            6.86            290         0              Normal
  03/30/2026 12 PM PDT            6.86            290         0              Normal
  03/30/2026 01 PM PDT            6.86            290         0              Normal
  03/30/2026 02 PM PDT            6.86            290         0              Normal
  03/30/2026 03 PM PDT            6.86            290         0              Normal
  03/30/2026 04 PM PDT            6.86            290         0              Normal
  03/30/2026 05 PM PDT            6.86            290         0              Normal
  03/30/2026 06 PM PDT            6.86            290         0              Normal
  03/30/2026 07 PM PDT            6.86            290         0              Normal
  03/30/2026 08 PM PDT            6.86            290         0              Normal
  03/30/2026 09 PM PDT            6.86            290         0              Normal
  03/30/2026 10 PM PDT            6.86            290         0              Normal
  03/30/2026 11 PM PDT            6.86            290         0              Normal
  03/31/2026 12 AM PDT            6.86            290         0              Normal
  03/31/2026 01 AM PDT            6.86            290         0              Normal
  03/31/2026 02 AM PDT            6.86            290         0              Normal
  03/31/2026 03 AM PDT            6.86            290         0              Normal
  03/31/2026 04 AM PDT            6.86            290         0              Normal
  03/31/2026 05 AM PDT            6.86            290         0              Normal
  03/31/2026 06 AM PDT            6.86            290         0              Normal
  03/31/2026 07 AM PDT            6.87            293         +              Normal
  03/31/2026 08 AM PDT            6.87            293         0              Normal
  03/31/2026 09 AM PDT            6.87            293         0              Normal
  03/31/2026 10 AM PDT            6.87            293         0              Normal
  03/31/2026 11 AM PDT            6.87            293         0              Normal
  03/31/2026 12 PM PDT            6.87            293         0              Normal
  03/31/2026 01 PM PDT            6.87            293         0              Normal
  03/31/2026 02 PM PDT            6.87            293         0              Normal
  03/31/2026 03 PM PDT            6.87            293         0              Normal
  03/31/2026 04 PM PDT            6.87            293         0              Normal
  03/31/2026 05 PM PDT            6.87            293         0              Normal
  03/31/2026 06 PM PDT            6.87            293         0              Normal
  03/31/2026 07 PM PDT            6.87            293         0              Normal
  03/31/2026 08 PM PDT            6.87            293         0              Normal
  03/31/2026 09 PM PDT            6.87            293         0              Normal
  03/31/2026 10 PM PDT            6.87            293         0              Normal
  03/31/2026 11 PM PDT            6.87            293         0              Normal
  04/01/2026 12 AM PDT            6.87            293         0              Normal
  04/01/2026 01 AM PDT            6.87            293         0              Normal
  04/01/2026 02 AM PDT            6.87            293         0              Normal
  04/01/2026 03 AM PDT            6.87            293         0              Normal
  04/01/2026 04 AM PDT            6.87            293         0              Normal
  04/01/2026 05 AM PDT            6.87            293         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.