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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 29 2026 at 7:25 AM PDT | Next Issuance: | Apr 30 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: 04/29/2026 at 07:26 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 04/24/2026 at 07:00 AM PDT
# Maximum Observed Stage: 8.47 Feet
# Maximum Observed Flow: 1240 cfs
#
# Earliest Date & Time of Maximum Forecast: 04/29/2026 at 08:00 AM PDT
# Maximum Forecast Stage: 7.49 Feet
# Maximum Forecast Flow: 560 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
04/24/2026 07 AM PDT 8.47 1240 Normal
04/24/2026 08 AM PDT 8.46 1232 - Normal
04/24/2026 09 AM PDT 8.43 1205 - Normal
04/24/2026 10 AM PDT 8.43 1205 0 Normal
04/24/2026 11 AM PDT 8.42 1197 - Normal
04/24/2026 12 PM PDT 8.41 1188 - Normal
04/24/2026 01 PM PDT 8.40 1180 - Normal
04/24/2026 02 PM PDT 8.38 1163 - Normal
04/24/2026 03 PM PDT 8.38 1163 0 Normal
04/24/2026 04 PM PDT 8.38 1163 0 Normal
04/24/2026 05 PM PDT 8.35 1137 - Normal
04/24/2026 06 PM PDT 8.36 1146 + Normal
04/24/2026 07 PM PDT 8.37 1154 + Normal
04/24/2026 08 PM PDT 8.33 1121 - Normal
04/24/2026 09 PM PDT 8.33 1121 0 Normal
04/24/2026 10 PM PDT 8.32 1112 - Normal
04/24/2026 11 PM PDT 8.30 1096 - Normal
04/25/2026 12 AM PDT 8.28 1079 - Normal
04/25/2026 01 AM PDT 8.27 1071 - Normal
04/25/2026 02 AM PDT 8.26 1063 - Normal
04/25/2026 03 AM PDT 8.25 1055 - Normal
04/25/2026 04 AM PDT 8.24 1047 - Normal
04/25/2026 05 AM PDT 8.22 1031 - Normal
04/25/2026 06 AM PDT 8.21 1023 - Normal
04/25/2026 07 AM PDT 8.21 1023 0 Normal
04/25/2026 08 AM PDT 8.20 1015 - Normal
04/25/2026 09 AM PDT 8.20 1015 0 Normal
04/25/2026 10 AM PDT 8.17 992 - Normal
04/25/2026 11 AM PDT 8.18 999 + Normal
04/25/2026 12 PM PDT 8.18 999 0 Normal
04/25/2026 01 PM PDT 8.16 984 - Normal
04/25/2026 02 PM PDT 8.15 976 - Normal
04/25/2026 03 PM PDT 8.13 961 - Normal
04/25/2026 04 PM PDT 8.14 968 + Normal
04/25/2026 05 PM PDT 8.12 953 - Normal
04/25/2026 06 PM PDT 8.11 945 - Normal
04/25/2026 07 PM PDT 8.10 938 - Normal
04/25/2026 08 PM PDT 8.10 938 0 Normal
04/25/2026 09 PM PDT 8.11 945 + Normal
04/25/2026 10 PM PDT 8.06 908 - Normal
04/25/2026 11 PM PDT 8.08 923 + Normal
04/26/2026 12 AM PDT 8.04 893 - Normal
04/26/2026 01 AM PDT 8.03 886 - Normal
04/26/2026 02 AM PDT 8.01 871 - Normal
04/26/2026 03 AM PDT 8.01 871 0 Normal
04/26/2026 04 AM PDT 8.00 864 - Normal
04/26/2026 05 AM PDT 8.00 864 0 Normal
04/26/2026 06 AM PDT 7.99 857 - Normal
04/26/2026 07 AM PDT 7.98 849 - Normal
04/26/2026 08 AM PDT 7.98 849 0 Normal
04/26/2026 09 AM PDT 7.97 842 - Normal
04/26/2026 10 AM PDT 7.96 835 - Normal
04/26/2026 11 AM PDT 7.95 828 - Normal
04/26/2026 12 PM PDT 7.94 821 - Normal
04/26/2026 01 PM PDT 7.93 814 - Normal
04/26/2026 02 PM PDT 7.93 814 0 Normal
04/26/2026 03 PM PDT 7.92 807 - Normal
04/26/2026 04 PM PDT 7.93 814 + Normal
04/26/2026 05 PM PDT 7.93 814 0 Normal
04/26/2026 06 PM PDT 7.91 800 - Normal
04/26/2026 07 PM PDT 7.89 786 - Normal
04/26/2026 08 PM PDT 7.90 793 + Normal
04/26/2026 09 PM PDT 7.89 786 - Normal
04/26/2026 10 PM PDT 7.86 766 - Normal
04/26/2026 11 PM PDT 7.86 766 0 Normal
04/27/2026 12 AM PDT 7.85 759 - Normal
04/27/2026 01 AM PDT 7.84 752 - Normal
04/27/2026 02 AM PDT 7.83 746 - Normal
04/27/2026 03 AM PDT 7.81 732 - Normal
04/27/2026 04 AM PDT 7.80 726 - Normal
04/27/2026 05 AM PDT 7.81 732 + Normal
04/27/2026 06 AM PDT 7.79 719 - Normal
04/27/2026 07 AM PDT 7.79 719 0 Normal
04/27/2026 08 AM PDT 7.78 713 - Normal
04/27/2026 09 AM PDT 7.77 706 - Normal
04/27/2026 10 AM PDT 7.76 700 - Normal
04/27/2026 11 AM PDT 7.76 700 0 Normal
04/27/2026 12 PM PDT 7.77 706 + Normal
04/27/2026 01 PM PDT 7.74 688 - Normal
04/27/2026 02 PM PDT 7.75 693 + Normal
04/27/2026 03 PM PDT 7.74 688 - Normal
04/27/2026 04 PM PDT 7.74 688 0 Normal
04/27/2026 05 PM PDT 7.74 688 0 Normal
04/27/2026 06 PM PDT 7.73 682 - Normal
04/27/2026 07 PM PDT 7.73 682 0 Normal
04/27/2026 08 PM PDT 7.73 682 0 Normal
04/27/2026 09 PM PDT 7.71 672 - Normal
04/27/2026 10 PM PDT 7.71 672 0 Normal
04/27/2026 11 PM PDT 7.69 661 - Normal
04/28/2026 12 AM PDT 7.68 656 - Normal
04/28/2026 01 AM PDT 7.67 650 - Normal
04/28/2026 02 AM PDT 7.67 650 0 Normal
04/28/2026 03 AM PDT 7.66 645 - Normal
04/28/2026 04 AM PDT 7.64 635 - Normal
04/28/2026 05 AM PDT 7.65 640 + Normal
04/28/2026 06 AM PDT 7.64 635 - Normal
04/28/2026 07 AM PDT 7.63 630 - Normal
04/28/2026 08 AM PDT 7.63 630 0 Normal
04/28/2026 09 AM PDT 7.62 624 - Normal
04/28/2026 10 AM PDT 7.62 624 0 Normal
04/28/2026 11 AM PDT 7.63 630 + Normal
04/28/2026 12 PM PDT 7.61 619 - Normal
04/28/2026 01 PM PDT 7.62 624 + Normal
04/28/2026 02 PM PDT 7.61 619 - Normal
04/28/2026 03 PM PDT 7.62 624 + Normal
04/28/2026 04 PM PDT 7.63 630 + Normal
04/28/2026 05 PM PDT 7.62 624 - Normal
04/28/2026 06 PM PDT 7.62 624 0 Normal
04/28/2026 07 PM PDT 7.61 619 - Normal
04/28/2026 08 PM PDT 7.59 609 - Normal
04/28/2026 09 PM PDT 7.59 609 0 Normal
04/28/2026 10 PM PDT 7.59 609 0 Normal
04/28/2026 11 PM PDT 7.57 599 - Normal
04/29/2026 12 AM PDT 7.55 589 - Normal
04/29/2026 01 AM PDT 7.55 589 0 Normal
04/29/2026 02 AM PDT 7.54 584 - Normal
04/29/2026 03 AM PDT 7.53 579 - Normal
04/29/2026 04 AM PDT 7.53 579 0 Normal
04/29/2026 05 AM PDT 7.52 574 - Normal
04/29/2026 06 AM PDT 7.51 569 - Normal
04/29/2026 07 AM PDT 7.50 565 - Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
04/29/2026 08 AM PDT 7.49 560 Normal
04/29/2026 09 AM PDT 7.48 555 - Normal
04/29/2026 10 AM PDT 7.47 550 - Normal
04/29/2026 11 AM PDT 7.46 545 - Normal
04/29/2026 12 PM PDT 7.45 541 - Normal
04/29/2026 01 PM PDT 7.44 536 - Normal
04/29/2026 02 PM PDT 7.43 531 - Normal
04/29/2026 03 PM PDT 7.42 526 - Normal
04/29/2026 04 PM PDT 7.42 526 0 Normal
04/29/2026 05 PM PDT 7.41 522 - Normal
04/29/2026 06 PM PDT 7.40 517 - Normal
04/29/2026 07 PM PDT 7.39 512 - Normal
04/29/2026 08 PM PDT 7.39 512 0 Normal
04/29/2026 09 PM PDT 7.38 508 - Normal
04/29/2026 10 PM PDT 7.38 508 0 Normal
04/29/2026 11 PM PDT 7.37 503 - Normal
04/30/2026 12 AM PDT 7.36 499 - Normal
04/30/2026 01 AM PDT 7.36 499 0 Normal
04/30/2026 02 AM PDT 7.35 494 - Normal
04/30/2026 03 AM PDT 7.35 494 0 Normal
04/30/2026 04 AM PDT 7.34 490 - Normal
04/30/2026 05 AM PDT 7.34 490 0 Normal
04/30/2026 06 AM PDT 7.33 485 - Normal
04/30/2026 07 AM PDT 7.33 485 0 Normal
04/30/2026 08 AM PDT 7.32 481 - Normal
04/30/2026 09 AM PDT 7.32 481 0 Normal
04/30/2026 10 AM PDT 7.31 476 - Normal
04/30/2026 11 AM PDT 7.30 472 - Normal
04/30/2026 12 PM PDT 7.30 472 0 Normal
04/30/2026 01 PM PDT 7.30 472 0 Normal
04/30/2026 02 PM PDT 7.29 467 - Normal
04/30/2026 03 PM PDT 7.29 467 0 Normal
04/30/2026 04 PM PDT 7.28 463 - Normal
04/30/2026 05 PM PDT 7.28 463 0 Normal
04/30/2026 06 PM PDT 7.27 459 - Normal
04/30/2026 07 PM PDT 7.26 454 - Normal
04/30/2026 08 PM PDT 7.26 454 0 Normal
04/30/2026 09 PM PDT 7.25 450 - Normal
04/30/2026 10 PM PDT 7.25 450 0 Normal
04/30/2026 11 PM PDT 7.24 446 - Normal
05/01/2026 12 AM PDT 7.24 446 0 Normal
05/01/2026 01 AM PDT 7.23 441 - Normal
05/01/2026 02 AM PDT 7.23 441 0 Normal
05/01/2026 03 AM PDT 7.22 437 - Normal
05/01/2026 04 AM PDT 7.22 437 0 Normal
05/01/2026 05 AM PDT 7.22 437 0 Normal
05/01/2026 06 AM PDT 7.21 433 - Normal
05/01/2026 07 AM PDT 7.21 433 0 Normal
05/01/2026 08 AM PDT 7.20 429 - Normal
05/01/2026 09 AM PDT 7.20 429 0 Normal
05/01/2026 10 AM PDT 7.20 429 0 Normal
05/01/2026 11 AM PDT 7.19 425 - Normal
05/01/2026 12 PM PDT 7.19 425 0 Normal
05/01/2026 01 PM PDT 7.18 420 - Normal
05/01/2026 02 PM PDT 7.18 420 0 Normal
05/01/2026 03 PM PDT 7.18 420 0 Normal
05/01/2026 04 PM PDT 7.17 416 - Normal
05/01/2026 05 PM PDT 7.17 416 0 Normal
05/01/2026 06 PM PDT 7.17 416 0 Normal
05/01/2026 07 PM PDT 7.16 412 - Normal
05/01/2026 08 PM PDT 7.16 412 0 Normal
05/01/2026 09 PM PDT 7.16 412 0 Normal
05/01/2026 10 PM PDT 7.15 408 - Normal
05/01/2026 11 PM PDT 7.15 408 0 Normal
05/02/2026 12 AM PDT 7.14 404 - Normal
05/02/2026 01 AM PDT 7.14 404 0 Normal
05/02/2026 02 AM PDT 7.14 404 0 Normal
05/02/2026 03 AM PDT 7.13 400 - Normal
05/02/2026 04 AM PDT 7.13 400 0 Normal
05/02/2026 05 AM PDT 7.12 396 - Normal
05/02/2026 06 AM PDT 7.12 396 0 Normal
05/02/2026 07 AM PDT 7.12 396 0 Normal
05/02/2026 08 AM PDT 7.11 391 - Normal
05/02/2026 09 AM PDT 7.11 391 0 Normal
05/02/2026 10 AM PDT 7.11 391 0 Normal
05/02/2026 11 AM PDT 7.10 387 - Normal
05/02/2026 12 PM PDT 7.10 387 0 Normal
05/02/2026 01 PM PDT 7.09 382 - Normal
05/02/2026 02 PM PDT 7.09 382 0 Normal
05/02/2026 03 PM PDT 7.08 378 - Normal
05/02/2026 04 PM PDT 7.08 378 0 Normal
05/02/2026 05 PM PDT 7.07 374 - Normal
05/02/2026 06 PM PDT 7.07 374 0 Normal
05/02/2026 07 PM PDT 7.07 374 0 Normal
05/02/2026 08 PM PDT 7.06 369 - Normal
05/02/2026 09 PM PDT 7.06 369 0 Normal
05/02/2026 10 PM PDT 7.06 369 0 Normal
05/02/2026 11 PM PDT 7.05 365 - Normal
05/03/2026 12 AM PDT 7.05 365 0 Normal
05/03/2026 01 AM PDT 7.05 365 0 Normal
05/03/2026 02 AM PDT 7.04 361 - Normal
05/03/2026 03 AM PDT 7.04 361 0 Normal
05/03/2026 04 AM PDT 7.04 361 0 Normal
05/03/2026 05 AM PDT 7.03 357 - Normal
05/03/2026 06 AM PDT 7.03 357 0 Normal
05/03/2026 07 AM PDT 7.02 352 - Normal
05/03/2026 08 AM PDT 7.02 352 0 Normal
05/03/2026 09 AM PDT 7.01 348 - Normal
05/03/2026 10 AM PDT 7.01 348 0 Normal
05/03/2026 11 AM PDT 7.00 344 - Normal
05/03/2026 12 PM PDT 7.00 344 0 Normal
05/03/2026 01 PM PDT 6.99 340 - Normal
05/03/2026 02 PM PDT 6.99 340 0 Normal
05/03/2026 03 PM PDT 6.98 336 - Normal
05/03/2026 04 PM PDT 6.98 336 0 Normal
05/03/2026 05 PM PDT 6.97 332 - Normal
05/03/2026 06 PM PDT 6.97 332 0 Normal
05/03/2026 07 PM PDT 6.96 328 - Normal
05/03/2026 08 PM PDT 6.96 328 0 Normal
05/03/2026 09 PM PDT 6.96 328 0 Normal
05/03/2026 10 PM PDT 6.95 324 - Normal
05/03/2026 11 PM PDT 6.95 324 0 Normal
05/04/2026 12 AM PDT 6.95 324 0 Normal
05/04/2026 01 AM PDT 6.95 324 0 Normal
05/04/2026 02 AM PDT 6.95 324 0 Normal
05/04/2026 03 AM PDT 6.94 320 - Normal
05/04/2026 04 AM PDT 6.94 320 0 Normal
05/04/2026 05 AM PDT 6.94 320 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.
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