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MAD RIVER - ARCATA (ARCC1)
| Latitude: 40.91º N | Longitude: 124.06º W | Elevation: 13 Feet | | Forecast Type: Official Location |
| Location: Humboldt County in California | Bulletin Group: North Coast | River Group: North Coast |
| Issuance Time: | Apr 24 2026 at 7:10 AM PDT | Next Issuance: | Apr 25 2026 at 9:00 AM PDT
| |
| Action/Monitor: 15.0 Feet | Minor Flood: 22.0 Feet | Moderate Flood: 24.0 Feet | Major Flood: 28.0 Feet |
# Tabular Observed and Forecast Hydrograph Information
#
# Location: Mad River - Arcata (ARCC1)
#
# File Generation Time: 04/24/2026 at 07:10 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 04/22/2026 at 01:00 PM PDT
# Maximum Observed Stage: 9.31 Feet
# Maximum Observed Flow: 2120 cfs
#
# Earliest Date & Time of Maximum Forecast: 04/24/2026 at 08:00 AM PDT
# Maximum Forecast Stage: 8.49 Feet
# Maximum Forecast Flow: 1258 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
04/19/2026 07 AM PDT 7.43 531 Normal
04/19/2026 08 AM PDT 7.43 531 0 Normal
04/19/2026 09 AM PDT 7.43 531 0 Normal
04/19/2026 10 AM PDT 7.42 526 - Normal
04/19/2026 11 AM PDT 7.42 526 0 Normal
04/19/2026 12 PM PDT 7.42 526 0 Normal
04/19/2026 01 PM PDT 7.41 522 - Normal
04/19/2026 02 PM PDT 7.41 522 0 Normal
04/19/2026 03 PM PDT 7.41 522 0 Normal
04/19/2026 04 PM PDT 7.41 522 0 Normal
04/19/2026 05 PM PDT 7.41 522 0 Normal
04/19/2026 06 PM PDT 7.42 526 + Normal
04/19/2026 07 PM PDT 7.40 517 - Normal
04/19/2026 08 PM PDT 7.40 517 0 Normal
04/19/2026 09 PM PDT 7.41 522 + Normal
04/19/2026 10 PM PDT 7.38 508 - Normal
04/19/2026 11 PM PDT 7.37 503 - Normal
04/20/2026 12 AM PDT 7.35 494 - Normal
04/20/2026 01 AM PDT 7.35 494 0 Normal
04/20/2026 02 AM PDT 7.33 485 - Normal
04/20/2026 03 AM PDT 7.34 490 + Normal
04/20/2026 04 AM PDT 7.32 481 - Normal
04/20/2026 05 AM PDT 7.31 476 - Normal
04/20/2026 06 AM PDT 7.32 481 + Normal
04/20/2026 07 AM PDT 7.33 485 + Normal
04/20/2026 08 AM PDT 7.32 481 - Normal
04/20/2026 09 AM PDT 7.33 485 + Normal
04/20/2026 10 AM PDT 7.34 490 + Normal
04/20/2026 11 AM PDT 7.35 494 + Normal
04/20/2026 12 PM PDT 7.35 494 0 Normal
04/20/2026 01 PM PDT 7.35 494 0 Normal
04/20/2026 02 PM PDT 7.35 494 0 Normal
04/20/2026 03 PM PDT 7.36 499 + Normal
04/20/2026 04 PM PDT 7.38 508 + Normal
04/20/2026 05 PM PDT 7.39 512 + Normal
04/20/2026 06 PM PDT 7.41 522 + Normal
04/20/2026 07 PM PDT 7.44 536 + Normal
04/20/2026 08 PM PDT 7.46 545 + Normal
04/20/2026 09 PM PDT 7.50 565 + Normal
04/20/2026 10 PM PDT 7.53 579 + Normal
04/20/2026 11 PM PDT 7.57 599 + Normal
04/21/2026 12 AM PDT 7.62 624 + Normal
04/21/2026 01 AM PDT 7.70 666 + Normal
04/21/2026 02 AM PDT 7.78 713 + Normal
04/21/2026 03 AM PDT 7.88 779 + Normal
04/21/2026 04 AM PDT 8.01 871 + Normal
04/21/2026 05 AM PDT 8.12 953 + Normal
04/21/2026 06 AM PDT 8.24 1047 + Normal
04/21/2026 07 AM PDT 8.37 1154 + Normal
04/21/2026 08 AM PDT 8.52 1285 + Normal
04/21/2026 09 AM PDT 8.66 1414 + Normal
04/21/2026 10 AM PDT 8.76 1514 + Normal
04/21/2026 11 AM PDT 8.82 1576 + Normal
04/21/2026 12 PM PDT 8.85 1607 + Normal
04/21/2026 01 PM PDT 8.85 1607 0 Normal
04/21/2026 02 PM PDT 8.85 1607 0 Normal
04/21/2026 03 PM PDT 8.82 1576 - Normal
04/21/2026 04 PM PDT 8.80 1555 - Normal
04/21/2026 05 PM PDT 8.78 1534 - Normal
04/21/2026 06 PM PDT 8.77 1524 - Normal
04/21/2026 07 PM PDT 8.76 1514 - Normal
04/21/2026 08 PM PDT 8.77 1524 + Normal
04/21/2026 09 PM PDT 8.79 1545 + Normal
04/21/2026 10 PM PDT 8.80 1555 + Normal
04/21/2026 11 PM PDT 8.87 1628 + Normal
04/22/2026 12 AM PDT 8.92 1681 + Normal
04/22/2026 01 AM PDT 9.04 1811 + Normal
04/22/2026 02 AM PDT 9.13 1911 + Normal
04/22/2026 03 AM PDT 9.18 1968 + Normal
04/22/2026 04 AM PDT 9.22 2014 + Normal
04/22/2026 05 AM PDT 9.24 2037 + Normal
04/22/2026 06 AM PDT 9.25 2049 + Normal
04/22/2026 07 AM PDT 9.25 2049 0 Normal
04/22/2026 08 AM PDT 9.29 2096 + Normal
04/22/2026 09 AM PDT 9.28 2084 - Normal
04/22/2026 10 AM PDT 9.30 2108 + Normal
04/22/2026 11 AM PDT 9.29 2096 - Normal
04/22/2026 12 PM PDT 9.29 2096 0 Normal
04/22/2026 01 PM PDT 9.31 2120 + Normal
04/22/2026 02 PM PDT 9.23 2026 - Normal
04/22/2026 03 PM PDT 9.24 2037 + Normal
04/22/2026 04 PM PDT 9.23 2026 - Normal
04/22/2026 05 PM PDT 9.15 1934 - Normal
04/22/2026 06 PM PDT 9.16 1945 + Normal
04/22/2026 07 PM PDT 9.13 1911 - Normal
04/22/2026 08 PM PDT 9.09 1866 - Normal
04/22/2026 09 PM PDT 9.07 1844 - Normal
04/22/2026 10 PM PDT 9.02 1789 - Normal
04/22/2026 11 PM PDT 8.97 1734 - Normal
04/23/2026 12 AM PDT 8.98 1745 + Normal
04/23/2026 01 AM PDT 8.96 1723 - Normal
04/23/2026 02 AM PDT 8.93 1691 - Normal
04/23/2026 03 AM PDT 8.90 1659 - Normal
04/23/2026 04 AM PDT 8.88 1638 - Normal
04/23/2026 05 AM PDT 8.88 1638 0 Normal
04/23/2026 06 AM PDT 8.84 1596 - Normal
04/23/2026 07 AM PDT 8.84 1596 0 Normal
04/23/2026 08 AM PDT 8.79 1545 - Normal
04/23/2026 09 AM PDT 8.81 1565 + Normal
04/23/2026 10 AM PDT 8.78 1534 - Normal
04/23/2026 11 AM PDT 8.77 1524 - Normal
04/23/2026 12 PM PDT 8.74 1494 - Normal
04/23/2026 01 PM PDT 8.75 1504 + Normal
04/23/2026 02 PM PDT 8.73 1484 - Normal
04/23/2026 03 PM PDT 8.69 1444 - Normal
04/23/2026 04 PM PDT 8.68 1434 - Normal
04/23/2026 05 PM PDT 8.68 1434 0 Normal
04/23/2026 06 PM PDT 8.68 1434 0 Normal
04/23/2026 07 PM PDT 8.64 1395 - Normal
04/23/2026 08 PM PDT 8.64 1395 0 Normal
04/23/2026 09 PM PDT 8.64 1395 0 Normal
04/23/2026 10 PM PDT 8.61 1367 - Normal
04/23/2026 11 PM PDT 8.59 1348 - Normal
04/24/2026 12 AM PDT 8.57 1330 - Normal
04/24/2026 01 AM PDT 8.56 1321 - Normal
04/24/2026 02 AM PDT 8.53 1294 - Normal
04/24/2026 03 AM PDT 8.50 1267 - Normal
04/24/2026 04 AM PDT 8.49 1258 - Normal
04/24/2026 05 AM PDT 8.50 1267 + Normal
04/24/2026 06 AM PDT 8.50 1267 0 Normal
04/24/2026 07 AM PDT 8.49 1258 - Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
04/24/2026 08 AM PDT 8.49 1258 Normal
04/24/2026 09 AM PDT 8.48 1249 - Normal
04/24/2026 10 AM PDT 8.48 1249 0 Normal
04/24/2026 11 AM PDT 8.48 1249 0 Normal
04/24/2026 12 PM PDT 8.48 1249 0 Normal
04/24/2026 01 PM PDT 8.47 1240 - Normal
04/24/2026 02 PM PDT 8.47 1240 0 Normal
04/24/2026 03 PM PDT 8.46 1232 - Normal
04/24/2026 04 PM PDT 8.46 1232 0 Normal
04/24/2026 05 PM PDT 8.46 1232 0 Normal
04/24/2026 06 PM PDT 8.45 1223 - Normal
04/24/2026 07 PM PDT 8.45 1223 0 Normal
04/24/2026 08 PM PDT 8.44 1214 - Normal
04/24/2026 09 PM PDT 8.43 1205 - Normal
04/24/2026 10 PM PDT 8.42 1197 - Normal
04/24/2026 11 PM PDT 8.41 1188 - Normal
04/25/2026 12 AM PDT 8.41 1188 0 Normal
04/25/2026 01 AM PDT 8.40 1180 - Normal
04/25/2026 02 AM PDT 8.39 1171 - Normal
04/25/2026 03 AM PDT 8.38 1163 - Normal
04/25/2026 04 AM PDT 8.38 1163 0 Normal
04/25/2026 05 AM PDT 8.37 1154 - Normal
04/25/2026 06 AM PDT 8.36 1146 - Normal
04/25/2026 07 AM PDT 8.36 1146 0 Normal
04/25/2026 08 AM PDT 8.35 1137 - Normal
04/25/2026 09 AM PDT 8.34 1129 - Normal
04/25/2026 10 AM PDT 8.33 1121 - Normal
04/25/2026 11 AM PDT 8.32 1112 - Normal
04/25/2026 12 PM PDT 8.32 1112 0 Normal
04/25/2026 01 PM PDT 8.31 1104 - Normal
04/25/2026 02 PM PDT 8.30 1096 - Normal
04/25/2026 03 PM PDT 8.29 1088 - Normal
04/25/2026 04 PM PDT 8.29 1088 0 Normal
04/25/2026 05 PM PDT 8.28 1079 - Normal
04/25/2026 06 PM PDT 8.27 1071 - Normal
04/25/2026 07 PM PDT 8.27 1071 0 Normal
04/25/2026 08 PM PDT 8.26 1063 - Normal
04/25/2026 09 PM PDT 8.25 1055 - Normal
04/25/2026 10 PM PDT 8.24 1047 - Normal
04/25/2026 11 PM PDT 8.24 1047 0 Normal
04/26/2026 12 AM PDT 8.23 1039 - Normal
04/26/2026 01 AM PDT 8.22 1031 - Normal
04/26/2026 02 AM PDT 8.21 1023 - Normal
04/26/2026 03 AM PDT 8.21 1023 0 Normal
04/26/2026 04 AM PDT 8.20 1015 - Normal
04/26/2026 05 AM PDT 8.19 1007 - Normal
04/26/2026 06 AM PDT 8.19 1007 0 Normal
04/26/2026 07 AM PDT 8.18 999 - Normal
04/26/2026 08 AM PDT 8.18 999 0 Normal
04/26/2026 09 AM PDT 8.17 992 - Normal
04/26/2026 10 AM PDT 8.16 984 - Normal
04/26/2026 11 AM PDT 8.16 984 0 Normal
04/26/2026 12 PM PDT 8.15 976 - Normal
04/26/2026 01 PM PDT 8.14 968 - Normal
04/26/2026 02 PM PDT 8.14 968 0 Normal
04/26/2026 03 PM PDT 8.13 961 - Normal
04/26/2026 04 PM PDT 8.12 953 - Normal
04/26/2026 05 PM PDT 8.12 953 0 Normal
04/26/2026 06 PM PDT 8.11 945 - Normal
04/26/2026 07 PM PDT 8.11 945 0 Normal
04/26/2026 08 PM PDT 8.10 938 - Normal
04/26/2026 09 PM PDT 8.09 930 - Normal
04/26/2026 10 PM PDT 8.09 930 0 Normal
04/26/2026 11 PM PDT 8.08 923 - Normal
04/27/2026 12 AM PDT 8.07 915 - Normal
04/27/2026 01 AM PDT 8.07 915 0 Normal
04/27/2026 02 AM PDT 8.06 908 - Normal
04/27/2026 03 AM PDT 8.05 900 - Normal
04/27/2026 04 AM PDT 8.05 900 0 Normal
04/27/2026 05 AM PDT 8.04 893 - Normal
04/27/2026 06 AM PDT 8.03 886 - Normal
04/27/2026 07 AM PDT 8.03 886 0 Normal
04/27/2026 08 AM PDT 8.02 878 - Normal
04/27/2026 09 AM PDT 8.01 871 - Normal
04/27/2026 10 AM PDT 8.01 871 0 Normal
04/27/2026 11 AM PDT 8.00 864 - Normal
04/27/2026 12 PM PDT 8.00 864 0 Normal
04/27/2026 01 PM PDT 7.99 857 - Normal
04/27/2026 02 PM PDT 7.98 849 - Normal
04/27/2026 03 PM PDT 7.98 849 0 Normal
04/27/2026 04 PM PDT 7.97 842 - Normal
04/27/2026 05 PM PDT 7.96 835 - Normal
04/27/2026 06 PM PDT 7.96 835 0 Normal
04/27/2026 07 PM PDT 7.95 828 - Normal
04/27/2026 08 PM PDT 7.95 828 0 Normal
04/27/2026 09 PM PDT 7.94 821 - Normal
04/27/2026 10 PM PDT 7.93 814 - Normal
04/27/2026 11 PM PDT 7.93 814 0 Normal
04/28/2026 12 AM PDT 7.92 807 - Normal
04/28/2026 01 AM PDT 7.92 807 0 Normal
04/28/2026 02 AM PDT 7.91 800 - Normal
04/28/2026 03 AM PDT 7.90 793 - Normal
04/28/2026 04 AM PDT 7.90 793 0 Normal
04/28/2026 05 AM PDT 7.89 786 - Normal
04/28/2026 06 AM PDT 7.89 786 0 Normal
04/28/2026 07 AM PDT 7.88 779 - Normal
04/28/2026 08 AM PDT 7.88 779 0 Normal
04/28/2026 09 AM PDT 7.87 773 - Normal
04/28/2026 10 AM PDT 7.86 766 - Normal
04/28/2026 11 AM PDT 7.86 766 0 Normal
04/28/2026 12 PM PDT 7.85 759 - Normal
04/28/2026 01 PM PDT 7.85 759 0 Normal
04/28/2026 02 PM PDT 7.84 752 - Normal
04/28/2026 03 PM PDT 7.83 746 - Normal
04/28/2026 04 PM PDT 7.83 746 0 Normal
04/28/2026 05 PM PDT 7.83 746 0 Normal
04/28/2026 06 PM PDT 7.82 739 - Normal
04/28/2026 07 PM PDT 7.82 739 0 Normal
04/28/2026 08 PM PDT 7.82 739 0 Normal
04/28/2026 09 PM PDT 7.81 732 - Normal
04/28/2026 10 PM PDT 7.80 726 - Normal
04/28/2026 11 PM PDT 7.80 726 0 Normal
04/29/2026 12 AM PDT 7.79 719 - Normal
04/29/2026 01 AM PDT 7.79 719 0 Normal
04/29/2026 02 AM PDT 7.78 713 - Normal
04/29/2026 03 AM PDT 7.77 706 - Normal
04/29/2026 04 AM PDT 7.76 700 - Normal
04/29/2026 05 AM PDT 7.75 693 - 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.
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