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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 06 2026 at 7:05 AM PDT | Next Issuance: | Apr 06 2026 at 3:00 PM PDT
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| 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: 04/06/2026 at 07:05 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 04/02/2026 at 11:00 AM PDT
# Maximum Observed Stage: 8.26 Feet
# Maximum Observed Flow: 1063 cfs
#
# Earliest Date & Time of Maximum Forecast: 04/11/2026 at 05:00 AM PDT
# Maximum Forecast Stage: 7.26 Feet
# Maximum Forecast Flow: 454 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
04/01/2026 07 AM PDT 6.72 240 Normal
04/01/2026 08 AM PDT 6.71 237 - Normal
04/01/2026 09 AM PDT 6.71 237 0 Normal
04/01/2026 10 AM PDT 6.73 244 + Normal
04/01/2026 11 AM PDT 6.75 250 + Normal
04/01/2026 12 PM PDT 6.79 264 + Normal
04/01/2026 01 PM PDT 6.80 268 + Normal
04/01/2026 02 PM PDT 6.80 268 0 Normal
04/01/2026 03 PM PDT 6.84 282 + Normal
04/01/2026 04 PM PDT 6.92 312 + Normal
04/01/2026 05 PM PDT 7.02 352 + Normal
04/01/2026 06 PM PDT 7.11 391 + Normal
04/01/2026 07 PM PDT 7.17 416 + Normal
04/01/2026 08 PM PDT 7.27 459 + Normal
04/01/2026 09 PM PDT 7.39 512 + Normal
04/01/2026 10 PM PDT 7.49 560 + Normal
04/01/2026 11 PM PDT 7.64 635 + Normal
04/02/2026 12 AM PDT 7.77 706 + Normal
04/02/2026 01 AM PDT 7.85 759 + Normal
04/02/2026 02 AM PDT 7.91 800 + Normal
04/02/2026 03 AM PDT 7.93 814 + Normal
04/02/2026 04 AM PDT 8.01 871 + Normal
04/02/2026 05 AM PDT 8.09 930 + Normal
04/02/2026 06 AM PDT 8.15 976 + Normal
04/02/2026 07 AM PDT 8.15 976 0 Normal
04/02/2026 08 AM PDT 8.18 999 + Normal
04/02/2026 09 AM PDT 8.20 1015 + Normal
04/02/2026 10 AM PDT 8.25 1055 + Normal
04/02/2026 11 AM PDT 8.26 1063 + Normal
04/02/2026 12 PM PDT 8.25 1055 - Normal
04/02/2026 01 PM PDT 8.24 1047 - Normal
04/02/2026 02 PM PDT 8.22 1031 - Normal
04/02/2026 03 PM PDT 8.19 1007 - Normal
04/02/2026 04 PM PDT 8.22 1031 + Normal
04/02/2026 05 PM PDT 8.16 984 - Normal
04/02/2026 06 PM PDT 8.14 968 - Normal
04/02/2026 07 PM PDT 8.09 930 - Normal
04/02/2026 08 PM PDT 8.06 908 - Normal
04/02/2026 09 PM PDT 8.02 878 - Normal
04/02/2026 10 PM PDT 7.98 849 - Normal
04/02/2026 11 PM PDT 7.95 828 - Normal
04/03/2026 12 AM PDT 7.91 800 - Normal
04/03/2026 01 AM PDT 7.88 779 - Normal
04/03/2026 02 AM PDT 7.84 752 - Normal
04/03/2026 03 AM PDT 7.84 752 0 Normal
04/03/2026 04 AM PDT 7.81 732 - Normal
04/03/2026 05 AM PDT 7.77 706 - Normal
04/03/2026 06 AM PDT 7.74 688 - Normal
04/03/2026 07 AM PDT 7.72 677 - Normal
04/03/2026 08 AM PDT 7.70 666 - Normal
04/03/2026 09 AM PDT 7.68 656 - Normal
04/03/2026 10 AM PDT 7.65 640 - Normal
04/03/2026 11 AM PDT 7.64 635 - Normal
04/03/2026 12 PM PDT 7.62 624 - Normal
04/03/2026 01 PM PDT 7.61 619 - Normal
04/03/2026 02 PM PDT 7.60 614 - Normal
04/03/2026 03 PM PDT 7.60 614 0 Normal
04/03/2026 04 PM PDT 7.59 609 - Normal
04/03/2026 05 PM PDT 7.58 604 - Normal
04/03/2026 06 PM PDT 7.57 599 - Normal
04/03/2026 07 PM PDT 7.55 589 - Normal
04/03/2026 08 PM PDT 7.54 584 - Normal
04/03/2026 09 PM PDT 7.52 574 - Normal
04/03/2026 10 PM PDT 7.50 565 - Normal
04/03/2026 11 PM PDT 7.47 550 - Normal
04/04/2026 12 AM PDT 7.46 545 - Normal
04/04/2026 01 AM PDT 7.45 541 - Normal
04/04/2026 02 AM PDT 7.43 531 - Normal
04/04/2026 03 AM PDT 7.42 526 - Normal
04/04/2026 04 AM PDT 7.41 522 - Normal
04/04/2026 05 AM PDT 7.40 517 - Normal
04/04/2026 06 AM PDT 7.37 503 - Normal
04/04/2026 07 AM PDT 7.37 503 0 Normal
04/04/2026 08 AM PDT 7.36 499 - Normal
04/04/2026 09 AM PDT 7.35 494 - Normal
04/04/2026 10 AM PDT 7.33 485 - Normal
04/04/2026 11 AM PDT 7.34 490 + Normal
04/04/2026 12 PM PDT 7.32 481 - Normal
04/04/2026 01 PM PDT 7.31 476 - Normal
04/04/2026 02 PM PDT 7.31 476 0 Normal
04/04/2026 03 PM PDT 7.29 467 - Normal
04/04/2026 04 PM PDT 7.28 463 - Normal
04/04/2026 05 PM PDT 7.29 467 + Normal
04/04/2026 06 PM PDT 7.28 463 - Normal
04/04/2026 07 PM PDT 7.27 459 - Normal
04/04/2026 08 PM PDT 7.26 454 - Normal
04/04/2026 09 PM PDT 7.26 454 0 Normal
04/04/2026 10 PM PDT 7.25 450 - Normal
04/04/2026 11 PM PDT 7.24 446 - Normal
04/05/2026 12 AM PDT 7.22 437 - Normal
04/05/2026 01 AM PDT 7.21 433 - Normal
04/05/2026 02 AM PDT 7.19 425 - Normal
04/05/2026 03 AM PDT 7.19 425 0 Normal
04/05/2026 04 AM PDT 7.19 425 0 Normal
04/05/2026 05 AM PDT 7.17 416 - Normal
04/05/2026 06 AM PDT 7.17 416 0 Normal
04/05/2026 07 AM PDT 7.17 416 0 Normal
04/05/2026 08 AM PDT 7.15 408 - Normal
04/05/2026 09 AM PDT 7.15 408 0 Normal
04/05/2026 10 AM PDT 7.14 404 - Normal
04/05/2026 11 AM PDT 7.13 400 - Normal
04/05/2026 12 PM PDT 7.12 396 - Normal
04/05/2026 01 PM PDT 7.12 396 0 Normal
04/05/2026 02 PM PDT 7.11 391 - Normal
04/05/2026 03 PM PDT 7.11 391 0 Normal
04/05/2026 04 PM PDT 7.12 396 + Normal
04/05/2026 05 PM PDT 7.13 400 + Normal
04/05/2026 06 PM PDT 7.12 396 - Normal
04/05/2026 07 PM PDT 7.11 391 - Normal
04/05/2026 08 PM PDT 7.11 391 0 Normal
04/05/2026 09 PM PDT 7.10 387 - Normal
04/05/2026 10 PM PDT 7.09 382 - Normal
04/05/2026 11 PM PDT 7.07 374 - Normal
04/06/2026 12 AM PDT 7.07 374 0 Normal
04/06/2026 01 AM PDT 7.05 365 - Normal
04/06/2026 02 AM PDT 7.03 357 - Normal
04/06/2026 03 AM PDT 7.02 352 - Normal
04/06/2026 04 AM PDT 7.02 352 0 Normal
04/06/2026 05 AM PDT 7.02 352 0 Normal
04/06/2026 06 AM PDT 7.02 352 0 Normal
04/06/2026 07 AM PDT 7.01 348 - Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
04/06/2026 08 AM PDT 7.01 348 Normal
04/06/2026 09 AM PDT 7.01 348 0 Normal
04/06/2026 10 AM PDT 7.00 344 - Normal
04/06/2026 11 AM PDT 7.00 344 0 Normal
04/06/2026 12 PM PDT 7.00 344 0 Normal
04/06/2026 01 PM PDT 6.99 340 - Normal
04/06/2026 02 PM PDT 6.99 340 0 Normal
04/06/2026 03 PM PDT 6.99 340 0 Normal
04/06/2026 04 PM PDT 6.99 340 0 Normal
04/06/2026 05 PM PDT 6.99 340 0 Normal
04/06/2026 06 PM PDT 6.99 340 0 Normal
04/06/2026 07 PM PDT 6.98 336 - Normal
04/06/2026 08 PM PDT 6.98 336 0 Normal
04/06/2026 09 PM PDT 6.98 336 0 Normal
04/06/2026 10 PM PDT 6.98 336 0 Normal
04/06/2026 11 PM PDT 6.98 336 0 Normal
04/07/2026 12 AM PDT 6.97 332 - Normal
04/07/2026 01 AM PDT 6.97 332 0 Normal
04/07/2026 02 AM PDT 6.96 328 - Normal
04/07/2026 03 AM PDT 6.96 328 0 Normal
04/07/2026 04 AM PDT 6.96 328 0 Normal
04/07/2026 05 AM PDT 6.96 328 0 Normal
04/07/2026 06 AM PDT 6.96 328 0 Normal
04/07/2026 07 AM PDT 6.96 328 0 Normal
04/07/2026 08 AM PDT 6.96 328 0 Normal
04/07/2026 09 AM PDT 6.96 328 0 Normal
04/07/2026 10 AM PDT 6.95 324 - Normal
04/07/2026 11 AM PDT 6.95 324 0 Normal
04/07/2026 12 PM PDT 6.95 324 0 Normal
04/07/2026 01 PM PDT 6.95 324 0 Normal
04/07/2026 02 PM PDT 6.95 324 0 Normal
04/07/2026 03 PM PDT 6.94 320 - Normal
04/07/2026 04 PM PDT 6.94 320 0 Normal
04/07/2026 05 PM PDT 6.94 320 0 Normal
04/07/2026 06 PM PDT 6.94 320 0 Normal
04/07/2026 07 PM PDT 6.94 320 0 Normal
04/07/2026 08 PM PDT 6.94 320 0 Normal
04/07/2026 09 PM PDT 6.94 320 0 Normal
04/07/2026 10 PM PDT 6.94 320 0 Normal
04/07/2026 11 PM PDT 6.94 320 0 Normal
04/08/2026 12 AM PDT 6.93 316 - Normal
04/08/2026 01 AM PDT 6.93 316 0 Normal
04/08/2026 02 AM PDT 6.93 316 0 Normal
04/08/2026 03 AM PDT 6.93 316 0 Normal
04/08/2026 04 AM PDT 6.93 316 0 Normal
04/08/2026 05 AM PDT 6.93 316 0 Normal
04/08/2026 06 AM PDT 6.92 312 - Normal
04/08/2026 07 AM PDT 6.92 312 0 Normal
04/08/2026 08 AM PDT 6.92 312 0 Normal
04/08/2026 09 AM PDT 6.92 312 0 Normal
04/08/2026 10 AM PDT 6.92 312 0 Normal
04/08/2026 11 AM PDT 6.92 312 0 Normal
04/08/2026 12 PM PDT 6.92 312 0 Normal
04/08/2026 01 PM PDT 6.92 312 0 Normal
04/08/2026 02 PM PDT 6.91 308 - Normal
04/08/2026 03 PM PDT 6.91 308 0 Normal
04/08/2026 04 PM PDT 6.90 305 - Normal
04/08/2026 05 PM PDT 6.90 305 0 Normal
04/08/2026 06 PM PDT 6.89 301 - Normal
04/08/2026 07 PM PDT 6.89 301 0 Normal
04/08/2026 08 PM PDT 6.89 301 0 Normal
04/08/2026 09 PM PDT 6.88 297 - Normal
04/08/2026 10 PM PDT 6.88 297 0 Normal
04/08/2026 11 PM PDT 6.88 297 0 Normal
04/09/2026 12 AM PDT 6.88 297 0 Normal
04/09/2026 01 AM PDT 6.89 301 + Normal
04/09/2026 02 AM PDT 6.89 301 0 Normal
04/09/2026 03 AM PDT 6.89 301 0 Normal
04/09/2026 04 AM PDT 6.89 301 0 Normal
04/09/2026 05 AM PDT 6.89 301 0 Normal
04/09/2026 06 AM PDT 6.89 301 0 Normal
04/09/2026 07 AM PDT 6.89 301 0 Normal
04/09/2026 08 AM PDT 6.89 301 0 Normal
04/09/2026 09 AM PDT 6.89 301 0 Normal
04/09/2026 10 AM PDT 6.89 301 0 Normal
04/09/2026 11 AM PDT 6.89 301 0 Normal
04/09/2026 12 PM PDT 6.89 301 0 Normal
04/09/2026 01 PM PDT 6.88 297 - Normal
04/09/2026 02 PM PDT 6.88 297 0 Normal
04/09/2026 03 PM PDT 6.87 293 - Normal
04/09/2026 04 PM PDT 6.87 293 0 Normal
04/09/2026 05 PM PDT 6.86 290 - Normal
04/09/2026 06 PM PDT 6.86 290 0 Normal
04/09/2026 07 PM PDT 6.85 286 - Normal
04/09/2026 08 PM PDT 6.85 286 0 Normal
04/09/2026 09 PM PDT 6.84 282 - Normal
04/09/2026 10 PM PDT 6.84 282 0 Normal
04/09/2026 11 PM PDT 6.84 282 0 Normal
04/10/2026 12 AM PDT 6.84 282 0 Normal
04/10/2026 01 AM PDT 6.84 282 0 Normal
04/10/2026 02 AM PDT 6.84 282 0 Normal
04/10/2026 03 AM PDT 6.85 286 + Normal
04/10/2026 04 AM PDT 6.85 286 0 Normal
04/10/2026 05 AM PDT 6.85 286 0 Normal
04/10/2026 06 AM PDT 6.86 290 + Normal
04/10/2026 07 AM PDT 6.86 290 0 Normal
04/10/2026 08 AM PDT 6.86 290 0 Normal
04/10/2026 09 AM PDT 6.86 290 0 Normal
04/10/2026 10 AM PDT 6.87 293 + Normal
04/10/2026 11 AM PDT 6.87 293 0 Normal
04/10/2026 12 PM PDT 6.87 293 0 Normal
04/10/2026 01 PM PDT 6.88 297 + Normal
04/10/2026 02 PM PDT 6.88 297 0 Normal
04/10/2026 03 PM PDT 6.89 301 + Normal
04/10/2026 04 PM PDT 6.89 301 0 Normal
04/10/2026 05 PM PDT 6.90 305 + Normal
04/10/2026 06 PM PDT 6.90 305 0 Normal
04/10/2026 07 PM PDT 6.91 308 + Normal
04/10/2026 08 PM PDT 6.91 308 0 Normal
04/10/2026 09 PM PDT 6.92 312 + Normal
04/10/2026 10 PM PDT 6.93 316 + Normal
04/10/2026 11 PM PDT 6.96 328 + Normal
04/11/2026 12 AM PDT 7.00 344 + Normal
04/11/2026 01 AM PDT 7.05 365 + Normal
04/11/2026 02 AM PDT 7.11 391 + Normal
04/11/2026 03 AM PDT 7.17 416 + Normal
04/11/2026 04 AM PDT 7.22 437 + Normal
04/11/2026 05 AM PDT 7.26 454 + 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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