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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 08 2026 at 7:21 AM PDT | Next Issuance: | Apr 08 2026 at 3:00 PM 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: 04/08/2026 at 07:21 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 04/03/2026 at 07:00 AM PDT
# Maximum Observed Stage: 7.72 Feet
# Maximum Observed Flow: 677 cfs
#
# Earliest Date & Time of Maximum Forecast: 04/12/2026 at 02:00 AM PDT
# Maximum Forecast Stage: 10.09 Feet
# Maximum Forecast Flow: 3136 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
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 7.01 348 - Normal
04/06/2026 07 AM PDT 7.00 344 - Normal
04/06/2026 08 AM PDT 7.00 344 0 Normal
04/06/2026 09 AM PDT 6.99 340 - Normal
04/06/2026 10 AM PDT 6.99 340 0 Normal
04/06/2026 11 AM PDT 7.00 344 + Normal
04/06/2026 12 PM PDT 6.99 340 - Normal
04/06/2026 01 PM PDT 7.00 344 + Normal
04/06/2026 02 PM PDT 6.99 340 - 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 6.99 340 0 Normal
04/06/2026 08 PM PDT 6.98 336 - Normal
04/06/2026 09 PM PDT 6.98 336 0 Normal
04/06/2026 10 PM PDT 6.97 332 - Normal
04/06/2026 11 PM PDT 6.96 328 - Normal
04/07/2026 12 AM PDT 6.95 324 - Normal
04/07/2026 01 AM PDT 6.95 324 0 Normal
04/07/2026 02 AM PDT 6.94 320 - Normal
04/07/2026 03 AM PDT 6.94 320 0 Normal
04/07/2026 04 AM PDT 6.92 312 - Normal
04/07/2026 05 AM PDT 6.92 312 0 Normal
04/07/2026 06 AM PDT 6.92 312 0 Normal
04/07/2026 07 AM PDT 6.92 312 0 Normal
04/07/2026 08 AM PDT 6.91 308 - Normal
04/07/2026 09 AM PDT 6.90 305 - Normal
04/07/2026 10 AM PDT 6.90 305 0 Normal
04/07/2026 11 AM PDT 6.90 305 0 Normal
04/07/2026 12 PM PDT 6.90 305 0 Normal
04/07/2026 01 PM PDT 6.90 305 0 Normal
04/07/2026 02 PM PDT 6.90 305 0 Normal
04/07/2026 03 PM PDT 6.90 305 0 Normal
04/07/2026 04 PM PDT 6.90 305 0 Normal
04/07/2026 05 PM PDT 6.90 305 0 Normal
04/07/2026 06 PM PDT 6.90 305 0 Normal
04/07/2026 07 PM PDT 6.91 308 + Normal
04/07/2026 08 PM PDT 6.91 308 0 Normal
04/07/2026 09 PM PDT 6.90 305 - Normal
04/07/2026 10 PM PDT 6.89 301 - Normal
04/07/2026 11 PM PDT 6.88 297 - Normal
04/08/2026 12 AM PDT 6.87 293 - Normal
04/08/2026 01 AM PDT 6.86 290 - Normal
04/08/2026 02 AM PDT 6.85 286 - Normal
04/08/2026 03 AM PDT 6.85 286 0 Normal
04/08/2026 04 AM PDT 6.85 286 0 Normal
04/08/2026 05 AM PDT 6.86 290 + Normal
04/08/2026 06 AM PDT 6.86 290 0 Normal
04/08/2026 07 AM PDT 6.86 290 0 Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
04/08/2026 08 AM PDT 6.86 290 Normal
04/08/2026 09 AM PDT 6.86 290 0 Normal
04/08/2026 10 AM PDT 6.86 290 0 Normal
04/08/2026 11 AM PDT 6.86 290 0 Normal
04/08/2026 12 PM PDT 6.86 290 0 Normal
04/08/2026 01 PM PDT 6.86 290 0 Normal
04/08/2026 02 PM PDT 6.85 286 - Normal
04/08/2026 03 PM PDT 6.85 286 0 Normal
04/08/2026 04 PM PDT 6.84 282 - Normal
04/08/2026 05 PM PDT 6.84 282 0 Normal
04/08/2026 06 PM PDT 6.83 279 - Normal
04/08/2026 07 PM PDT 6.83 279 0 Normal
04/08/2026 08 PM PDT 6.83 279 0 Normal
04/08/2026 09 PM PDT 6.82 275 - Normal
04/08/2026 10 PM PDT 6.82 275 0 Normal
04/08/2026 11 PM PDT 6.82 275 0 Normal
04/09/2026 12 AM PDT 6.82 275 0 Normal
04/09/2026 01 AM PDT 6.82 275 0 Normal
04/09/2026 02 AM PDT 6.82 275 0 Normal
04/09/2026 03 AM PDT 6.83 279 + Normal
04/09/2026 04 AM PDT 6.83 279 0 Normal
04/09/2026 05 AM PDT 6.84 282 + Normal
04/09/2026 06 AM PDT 6.84 282 0 Normal
04/09/2026 07 AM PDT 6.85 286 + Normal
04/09/2026 08 AM PDT 6.85 286 0 Normal
04/09/2026 09 AM PDT 6.86 290 + Normal
04/09/2026 10 AM PDT 6.86 290 0 Normal
04/09/2026 11 AM PDT 6.86 290 0 Normal
04/09/2026 12 PM PDT 6.87 293 + Normal
04/09/2026 01 PM PDT 6.87 293 0 Normal
04/09/2026 02 PM PDT 6.87 293 0 Normal
04/09/2026 03 PM PDT 6.87 293 0 Normal
04/09/2026 04 PM PDT 6.87 293 0 Normal
04/09/2026 05 PM PDT 6.87 293 0 Normal
04/09/2026 06 PM PDT 6.86 290 - Normal
04/09/2026 07 PM PDT 6.86 290 0 Normal
04/09/2026 08 PM PDT 6.86 290 0 Normal
04/09/2026 09 PM PDT 6.85 286 - Normal
04/09/2026 10 PM PDT 6.85 286 0 Normal
04/09/2026 11 PM PDT 6.84 282 - Normal
04/10/2026 12 AM PDT 6.84 282 0 Normal
04/10/2026 01 AM PDT 6.83 279 - Normal
04/10/2026 02 AM PDT 6.83 279 0 Normal
04/10/2026 03 AM PDT 6.82 275 - Normal
04/10/2026 04 AM PDT 6.82 275 0 Normal
04/10/2026 05 AM PDT 6.81 271 - Normal
04/10/2026 06 AM PDT 6.81 271 0 Normal
04/10/2026 07 AM PDT 6.80 268 - Normal
04/10/2026 08 AM PDT 6.80 268 0 Normal
04/10/2026 09 AM PDT 6.80 268 0 Normal
04/10/2026 10 AM PDT 6.80 268 0 Normal
04/10/2026 11 AM PDT 6.80 268 0 Normal
04/10/2026 12 PM PDT 6.80 268 0 Normal
04/10/2026 01 PM PDT 6.81 271 + Normal
04/10/2026 02 PM PDT 6.81 271 0 Normal
04/10/2026 03 PM PDT 6.83 279 + Normal
04/10/2026 04 PM PDT 6.85 286 + Normal
04/10/2026 05 PM PDT 6.90 305 + Normal
04/10/2026 06 PM PDT 7.00 344 + Normal
04/10/2026 07 PM PDT 7.13 400 + Normal
04/10/2026 08 PM PDT 7.32 481 + Normal
04/10/2026 09 PM PDT 7.51 569 + Normal
04/10/2026 10 PM PDT 7.72 677 + Normal
04/10/2026 11 PM PDT 7.97 842 + Normal
04/11/2026 12 AM PDT 8.22 1031 + Normal
04/11/2026 01 AM PDT 8.41 1188 + Normal
04/11/2026 02 AM PDT 8.54 1303 + Normal
04/11/2026 03 AM PDT 8.60 1358 + Normal
04/11/2026 04 AM PDT 8.62 1376 + Normal
04/11/2026 05 AM PDT 8.61 1367 - Normal
04/11/2026 06 AM PDT 8.58 1339 - Normal
04/11/2026 07 AM PDT 8.54 1303 - Normal
04/11/2026 08 AM PDT 8.51 1276 - Normal
04/11/2026 09 AM PDT 8.49 1258 - Normal
04/11/2026 10 AM PDT 8.48 1249 - Normal
04/11/2026 11 AM PDT 8.47 1240 - Normal
04/11/2026 12 PM PDT 8.48 1249 + Normal
04/11/2026 01 PM PDT 8.51 1276 + Normal
04/11/2026 02 PM PDT 8.57 1330 + Normal
04/11/2026 03 PM PDT 8.69 1444 + Normal
04/11/2026 04 PM PDT 8.88 1638 + Normal
04/11/2026 05 PM PDT 9.10 1877 + Normal
04/11/2026 06 PM PDT 9.30 2108 + Normal
04/11/2026 07 PM PDT 9.47 2313 + Normal
04/11/2026 08 PM PDT 9.62 2502 + Normal
04/11/2026 09 PM PDT 9.74 2657 + Normal
04/11/2026 10 PM PDT 9.86 2817 + Normal
04/11/2026 11 PM PDT 9.95 2940 + Normal
04/12/2026 12 AM PDT 10.02 3037 + Normal
04/12/2026 01 AM PDT 10.07 3108 + Normal
04/12/2026 02 AM PDT 10.09 3136 + Normal
04/12/2026 03 AM PDT 10.07 3108 - Normal
04/12/2026 04 AM PDT 10.02 3037 - Normal
04/12/2026 05 AM PDT 9.95 2940 - Normal
04/12/2026 06 AM PDT 9.89 2858 - Normal
04/12/2026 07 AM PDT 9.82 2764 - Normal
04/12/2026 08 AM PDT 9.76 2684 - Normal
04/12/2026 09 AM PDT 9.71 2618 - Normal
04/12/2026 10 AM PDT 9.66 2553 - Normal
04/12/2026 11 AM PDT 9.61 2489 - Normal
04/12/2026 12 PM PDT 9.56 2425 - Normal
04/12/2026 01 PM PDT 9.52 2375 - Normal
04/12/2026 02 PM PDT 9.47 2313 - Normal
04/12/2026 03 PM PDT 9.42 2252 - Normal
04/12/2026 04 PM PDT 9.35 2167 - Normal
04/12/2026 05 PM PDT 9.29 2096 - Normal
04/12/2026 06 PM PDT 9.22 2014 - Normal
04/12/2026 07 PM PDT 9.17 1957 - Normal
04/12/2026 08 PM PDT 9.13 1911 - Normal
04/12/2026 09 PM PDT 9.10 1877 - Normal
04/12/2026 10 PM PDT 9.09 1866 - Normal
04/12/2026 11 PM PDT 9.09 1866 0 Normal
04/13/2026 12 AM PDT 9.09 1866 0 Normal
04/13/2026 01 AM PDT 9.09 1866 0 Normal
04/13/2026 02 AM PDT 9.08 1855 - Normal
04/13/2026 03 AM PDT 9.06 1833 - Normal
04/13/2026 04 AM PDT 9.02 1789 - Normal
04/13/2026 05 AM PDT 8.98 1745 - 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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