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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: | May 06 2026 at 7:26 AM PDT | Next Issuance: | May 07 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: 05/06/2026 at 07:26 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 05/01/2026 at 08:00 AM PDT
# Maximum Observed Stage: 7.29 Feet
# Maximum Observed Flow: 467 cfs
#
# Earliest Date & Time of Maximum Forecast: 05/06/2026 at 08:00 AM PDT
# Maximum Forecast Stage: 6.95 Feet
# Maximum Forecast Flow: 324 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
05/01/2026 07 AM PDT 7.28 463 Normal
05/01/2026 08 AM PDT 7.29 467 + Normal
05/01/2026 09 AM PDT 7.28 463 - Normal
05/01/2026 10 AM PDT 7.27 459 - Normal
05/01/2026 11 AM PDT 7.28 463 + Normal
05/01/2026 12 PM PDT 7.27 459 - Normal
05/01/2026 01 PM PDT 7.25 450 - Normal
05/01/2026 02 PM PDT 7.26 454 + Normal
05/01/2026 03 PM PDT 7.26 454 0 Normal
05/01/2026 04 PM PDT 7.27 459 + Normal
05/01/2026 05 PM PDT 7.26 454 - Normal
05/01/2026 06 PM PDT 7.26 454 0 Normal
05/01/2026 07 PM PDT 7.26 454 0 Normal
05/01/2026 08 PM PDT 7.25 450 - Normal
05/01/2026 09 PM PDT 7.25 450 0 Normal
05/01/2026 10 PM PDT 7.25 450 0 Normal
05/01/2026 11 PM PDT 7.25 450 0 Normal
05/02/2026 12 AM PDT 7.23 441 - Normal
05/02/2026 01 AM PDT 7.21 433 - Normal
05/02/2026 02 AM PDT 7.20 429 - Normal
05/02/2026 03 AM PDT 7.21 433 + Normal
05/02/2026 04 AM PDT 7.20 429 - Normal
05/02/2026 05 AM PDT 7.19 425 - Normal
05/02/2026 06 AM PDT 7.18 420 - Normal
05/02/2026 07 AM PDT 7.19 425 + Normal
05/02/2026 08 AM PDT 7.19 425 0 Normal
05/02/2026 09 AM PDT 7.20 429 + Normal
05/02/2026 10 AM PDT 7.19 425 - Normal
05/02/2026 11 AM PDT 7.19 425 0 Normal
05/02/2026 12 PM PDT 7.19 425 0 Normal
05/02/2026 01 PM PDT 7.18 420 - Normal
05/02/2026 02 PM PDT 7.18 420 0 Normal
05/02/2026 03 PM PDT 7.18 420 0 Normal
05/02/2026 04 PM PDT 7.18 420 0 Normal
05/02/2026 05 PM PDT 7.18 420 0 Normal
05/02/2026 06 PM PDT 7.18 420 0 Normal
05/02/2026 07 PM PDT 7.19 425 + Normal
05/02/2026 08 PM PDT 7.18 420 - Normal
05/02/2026 09 PM PDT 7.18 420 0 Normal
05/02/2026 10 PM PDT 7.17 416 - Normal
05/02/2026 11 PM PDT 7.16 412 - Normal
05/03/2026 12 AM PDT 7.16 412 0 Normal
05/03/2026 01 AM PDT 7.14 404 - Normal
05/03/2026 02 AM PDT 7.14 404 0 Normal
05/03/2026 03 AM PDT 7.13 400 - Normal
05/03/2026 04 AM PDT 7.13 400 0 Normal
05/03/2026 05 AM PDT 7.12 396 - Normal
05/03/2026 06 AM PDT 7.11 391 - Normal
05/03/2026 07 AM PDT 7.11 391 0 Normal
05/03/2026 08 AM PDT 7.11 391 0 Normal
05/03/2026 09 AM PDT 7.12 396 + Normal
05/03/2026 10 AM PDT 7.11 391 - Normal
05/03/2026 11 AM PDT 7.10 387 - Normal
05/03/2026 12 PM PDT 7.11 391 + Normal
05/03/2026 01 PM PDT 7.11 391 0 Normal
05/03/2026 02 PM PDT 7.10 387 - Normal
05/03/2026 03 PM PDT 7.11 391 + Normal
05/03/2026 04 PM PDT 7.10 387 - Normal
05/03/2026 05 PM PDT 7.11 391 + Normal
05/03/2026 06 PM PDT 7.11 391 0 Normal
05/03/2026 07 PM PDT 7.12 396 + Normal
05/03/2026 08 PM PDT 7.11 391 - Normal
05/03/2026 09 PM PDT 7.11 391 0 Normal
05/03/2026 10 PM PDT 7.10 387 - Normal
05/03/2026 11 PM PDT 7.09 382 - Normal
05/04/2026 12 AM PDT 7.08 378 - Normal
05/04/2026 01 AM PDT 7.08 378 0 Normal
05/04/2026 02 AM PDT 7.08 378 0 Normal
05/04/2026 03 AM PDT 7.08 378 0 Normal
05/04/2026 04 AM PDT 7.08 378 0 Normal
05/04/2026 05 AM PDT 7.08 378 0 Normal
05/04/2026 06 AM PDT 7.07 374 - Normal
05/04/2026 07 AM PDT 7.07 374 0 Normal
05/04/2026 08 AM PDT 7.07 374 0 Normal
05/04/2026 09 AM PDT 7.07 374 0 Normal
05/04/2026 10 AM PDT 7.08 378 + Normal
05/04/2026 11 AM PDT 7.08 378 0 Normal
05/04/2026 12 PM PDT 7.08 378 0 Normal
05/04/2026 01 PM PDT 7.07 374 - Normal
05/04/2026 02 PM PDT 7.10 387 + Normal
05/04/2026 03 PM PDT 7.09 382 - Normal
05/04/2026 04 PM PDT 7.08 378 - Normal
05/04/2026 05 PM PDT 7.09 382 + Normal
05/04/2026 06 PM PDT 7.10 387 + Normal
05/04/2026 07 PM PDT 7.09 382 - Normal
05/04/2026 08 PM PDT 7.08 378 - Normal
05/04/2026 09 PM PDT 7.08 378 0 Normal
05/04/2026 10 PM PDT 7.08 378 0 Normal
05/04/2026 11 PM PDT 7.08 378 0 Normal
05/05/2026 12 AM PDT 7.06 369 - Normal
05/05/2026 01 AM PDT 7.06 369 0 Normal
05/05/2026 02 AM PDT 7.05 365 - Normal
05/05/2026 03 AM PDT 7.05 365 0 Normal
05/05/2026 04 AM PDT 7.04 361 - Normal
05/05/2026 05 AM PDT 7.04 361 0 Normal
05/05/2026 06 AM PDT 7.05 365 + Normal
05/05/2026 07 AM PDT 7.06 369 + Normal
05/05/2026 08 AM PDT 7.07 374 + Normal
05/05/2026 09 AM PDT 7.04 361 - Normal
05/05/2026 10 AM PDT 7.05 365 + Normal
05/05/2026 11 AM PDT 7.05 365 0 Normal
05/05/2026 12 PM PDT 7.04 361 - Normal
05/05/2026 01 PM PDT 7.04 361 0 Normal
05/05/2026 02 PM PDT 7.05 365 + Normal
05/05/2026 03 PM PDT 7.04 361 - Normal
05/05/2026 04 PM PDT 7.05 365 + Normal
05/05/2026 05 PM PDT 7.05 365 0 Normal
05/05/2026 06 PM PDT 7.05 365 0 Normal
05/05/2026 07 PM PDT 7.04 361 - Normal
05/05/2026 08 PM PDT 7.03 357 - Normal
05/05/2026 09 PM PDT 7.02 352 - Normal
05/05/2026 10 PM PDT 7.01 348 - Normal
05/05/2026 11 PM PDT 7.00 344 - Normal
05/06/2026 12 AM PDT 6.99 340 - Normal
05/06/2026 01 AM PDT 6.98 336 - Normal
05/06/2026 02 AM PDT 6.97 332 - Normal
05/06/2026 03 AM PDT 6.97 332 0 Normal
05/06/2026 04 AM PDT 6.96 328 - Normal
05/06/2026 05 AM PDT 6.96 328 0 Normal
05/06/2026 06 AM PDT 6.96 328 0 Normal
05/06/2026 07 AM PDT 6.95 324 - Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
05/06/2026 08 AM PDT 6.95 324 Normal
05/06/2026 09 AM PDT 6.95 324 0 Normal
05/06/2026 10 AM PDT 6.94 320 - Normal
05/06/2026 11 AM PDT 6.94 320 0 Normal
05/06/2026 12 PM PDT 6.94 320 0 Normal
05/06/2026 01 PM PDT 6.93 316 - Normal
05/06/2026 02 PM PDT 6.93 316 0 Normal
05/06/2026 03 PM PDT 6.93 316 0 Normal
05/06/2026 04 PM PDT 6.93 316 0 Normal
05/06/2026 05 PM PDT 6.93 316 0 Normal
05/06/2026 06 PM PDT 6.93 316 0 Normal
05/06/2026 07 PM PDT 6.93 316 0 Normal
05/06/2026 08 PM PDT 6.93 316 0 Normal
05/06/2026 09 PM PDT 6.93 316 0 Normal
05/06/2026 10 PM PDT 6.93 316 0 Normal
05/06/2026 11 PM PDT 6.93 316 0 Normal
05/07/2026 12 AM PDT 6.93 316 0 Normal
05/07/2026 01 AM PDT 6.92 312 - Normal
05/07/2026 02 AM PDT 6.92 312 0 Normal
05/07/2026 03 AM PDT 6.92 312 0 Normal
05/07/2026 04 AM PDT 6.92 312 0 Normal
05/07/2026 05 AM PDT 6.92 312 0 Normal
05/07/2026 06 AM PDT 6.92 312 0 Normal
05/07/2026 07 AM PDT 6.91 308 - Normal
05/07/2026 08 AM PDT 6.91 308 0 Normal
05/07/2026 09 AM PDT 6.91 308 0 Normal
05/07/2026 10 AM PDT 6.91 308 0 Normal
05/07/2026 11 AM PDT 6.90 305 - Normal
05/07/2026 12 PM PDT 6.90 305 0 Normal
05/07/2026 01 PM PDT 6.90 305 0 Normal
05/07/2026 02 PM PDT 6.89 301 - Normal
05/07/2026 03 PM PDT 6.89 301 0 Normal
05/07/2026 04 PM PDT 6.89 301 0 Normal
05/07/2026 05 PM PDT 6.89 301 0 Normal
05/07/2026 06 PM PDT 6.89 301 0 Normal
05/07/2026 07 PM PDT 6.89 301 0 Normal
05/07/2026 08 PM PDT 6.89 301 0 Normal
05/07/2026 09 PM PDT 6.89 301 0 Normal
05/07/2026 10 PM PDT 6.89 301 0 Normal
05/07/2026 11 PM PDT 6.90 305 + Normal
05/08/2026 12 AM PDT 6.90 305 0 Normal
05/08/2026 01 AM PDT 6.90 305 0 Normal
05/08/2026 02 AM PDT 6.90 305 0 Normal
05/08/2026 03 AM PDT 6.90 305 0 Normal
05/08/2026 04 AM PDT 6.89 301 - Normal
05/08/2026 05 AM PDT 6.90 305 + Normal
05/08/2026 06 AM PDT 6.90 305 0 Normal
05/08/2026 07 AM PDT 6.90 305 0 Normal
05/08/2026 08 AM PDT 6.90 305 0 Normal
05/08/2026 09 AM PDT 6.90 305 0 Normal
05/08/2026 10 AM PDT 6.91 308 + Normal
05/08/2026 11 AM PDT 6.91 308 0 Normal
05/08/2026 12 PM PDT 6.91 308 0 Normal
05/08/2026 01 PM PDT 6.91 308 0 Normal
05/08/2026 02 PM PDT 6.91 308 0 Normal
05/08/2026 03 PM PDT 6.91 308 0 Normal
05/08/2026 04 PM PDT 6.90 305 - Normal
05/08/2026 05 PM PDT 6.90 305 0 Normal
05/08/2026 06 PM PDT 6.90 305 0 Normal
05/08/2026 07 PM PDT 6.90 305 0 Normal
05/08/2026 08 PM PDT 6.90 305 0 Normal
05/08/2026 09 PM PDT 6.90 305 0 Normal
05/08/2026 10 PM PDT 6.90 305 0 Normal
05/08/2026 11 PM PDT 6.89 301 - Normal
05/09/2026 12 AM PDT 6.89 301 0 Normal
05/09/2026 01 AM PDT 6.89 301 0 Normal
05/09/2026 02 AM PDT 6.88 297 - Normal
05/09/2026 03 AM PDT 6.88 297 0 Normal
05/09/2026 04 AM PDT 6.87 293 - Normal
05/09/2026 05 AM PDT 6.87 293 0 Normal
05/09/2026 06 AM PDT 6.87 293 0 Normal
05/09/2026 07 AM PDT 6.86 290 - Normal
05/09/2026 08 AM PDT 6.86 290 0 Normal
05/09/2026 09 AM PDT 6.86 290 0 Normal
05/09/2026 10 AM PDT 6.86 290 0 Normal
05/09/2026 11 AM PDT 6.85 286 - Normal
05/09/2026 12 PM PDT 6.85 286 0 Normal
05/09/2026 01 PM PDT 6.85 286 0 Normal
05/09/2026 02 PM PDT 6.84 282 - Normal
05/09/2026 03 PM PDT 6.84 282 0 Normal
05/09/2026 04 PM PDT 6.84 282 0 Normal
05/09/2026 05 PM PDT 6.84 282 0 Normal
05/09/2026 06 PM PDT 6.84 282 0 Normal
05/09/2026 07 PM PDT 6.84 282 0 Normal
05/09/2026 08 PM PDT 6.84 282 0 Normal
05/09/2026 09 PM PDT 6.84 282 0 Normal
05/09/2026 10 PM PDT 6.84 282 0 Normal
05/09/2026 11 PM PDT 6.83 279 - Normal
05/10/2026 12 AM PDT 6.83 279 0 Normal
05/10/2026 01 AM PDT 6.83 279 0 Normal
05/10/2026 02 AM PDT 6.83 279 0 Normal
05/10/2026 03 AM PDT 6.83 279 0 Normal
05/10/2026 04 AM PDT 6.83 279 0 Normal
05/10/2026 05 AM PDT 6.83 279 0 Normal
05/10/2026 06 AM PDT 6.83 279 0 Normal
05/10/2026 07 AM PDT 6.84 282 + Normal
05/10/2026 08 AM PDT 6.84 282 0 Normal
05/10/2026 09 AM PDT 6.85 286 + Normal
05/10/2026 10 AM PDT 6.86 290 + Normal
05/10/2026 11 AM PDT 6.86 290 0 Normal
05/10/2026 12 PM PDT 6.86 290 0 Normal
05/10/2026 01 PM PDT 6.87 293 + Normal
05/10/2026 02 PM PDT 6.87 293 0 Normal
05/10/2026 03 PM PDT 6.87 293 0 Normal
05/10/2026 04 PM PDT 6.87 293 0 Normal
05/10/2026 05 PM PDT 6.87 293 0 Normal
05/10/2026 06 PM PDT 6.87 293 0 Normal
05/10/2026 07 PM PDT 6.86 290 - Normal
05/10/2026 08 PM PDT 6.86 290 0 Normal
05/10/2026 09 PM PDT 6.85 286 - Normal
05/10/2026 10 PM PDT 6.85 286 0 Normal
05/10/2026 11 PM PDT 6.84 282 - Normal
05/11/2026 12 AM PDT 6.83 279 - Normal
05/11/2026 01 AM PDT 6.83 279 0 Normal
05/11/2026 02 AM PDT 6.82 275 - Normal
05/11/2026 03 AM PDT 6.82 275 0 Normal
05/11/2026 04 AM PDT 6.81 271 - Normal
05/11/2026 05 AM PDT 6.81 271 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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