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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: | Mar 27 2026 at 12:45 PM PDT | Next Issuance: | Mar 28 2026 at 9:00 AM 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: 03/27/2026 at 12:45 PM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 03/22/2026 at 08:00 PM PDT
# Maximum Observed Stage: 7.08 Feet
# Maximum Observed Flow: 378 cfs
#
# Earliest Date & Time of Maximum Forecast: 03/27/2026 at 01:00 PM PDT
# Maximum Forecast Stage: 6.91 Feet
# Maximum Forecast Flow: 308 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
03/22/2026 12 PM PDT 7.08 378 Normal
03/22/2026 01 PM PDT 7.07 374 - Normal
03/22/2026 02 PM PDT 7.07 374 0 Normal
03/22/2026 03 PM PDT 7.07 374 0 Normal
03/22/2026 04 PM PDT 7.06 369 - Normal
03/22/2026 05 PM PDT 7.08 378 + Normal
03/22/2026 06 PM PDT 7.08 378 0 Normal
03/22/2026 07 PM PDT 7.07 374 - Normal
03/22/2026 08 PM PDT 7.08 378 + Normal
03/22/2026 09 PM PDT 7.07 374 - Normal
03/22/2026 10 PM PDT 7.06 369 - Normal
03/22/2026 11 PM PDT 7.05 365 - Normal
03/23/2026 12 AM PDT 7.04 361 - Normal
03/23/2026 01 AM PDT 7.04 361 0 Normal
03/23/2026 02 AM PDT 7.03 357 - Normal
03/23/2026 03 AM PDT 7.04 361 + Normal
03/23/2026 04 AM PDT 7.02 352 - Normal
03/23/2026 05 AM PDT 7.03 357 + Normal
03/23/2026 06 AM PDT 7.02 352 - Normal
03/23/2026 07 AM PDT 7.02 352 0 Normal
03/23/2026 08 AM PDT 7.01 348 - Normal
03/23/2026 09 AM PDT 7.01 348 0 Normal
03/23/2026 10 AM PDT 7.01 348 0 Normal
03/23/2026 11 AM PDT 7.01 348 0 Normal
03/23/2026 12 PM PDT 7.01 348 0 Normal
03/23/2026 01 PM PDT 7.01 348 0 Normal
03/23/2026 02 PM PDT 7.01 348 0 Normal
03/23/2026 03 PM PDT 7.02 352 + Normal
03/23/2026 04 PM PDT 7.03 357 + Normal
03/23/2026 05 PM PDT 7.02 352 - Normal
03/23/2026 06 PM PDT 7.03 357 + Normal
03/23/2026 07 PM PDT 7.02 352 - Normal
03/23/2026 08 PM PDT 7.02 352 0 Normal
03/23/2026 09 PM PDT 7.02 352 0 Normal
03/23/2026 10 PM PDT 7.01 348 - Normal
03/23/2026 11 PM PDT 7.01 348 0 Normal
03/24/2026 12 AM PDT 7.00 344 - Normal
03/24/2026 01 AM PDT 6.99 340 - Normal
03/24/2026 02 AM PDT 6.99 340 0 Normal
03/24/2026 03 AM PDT 6.98 336 - Normal
03/24/2026 04 AM PDT 6.98 336 0 Normal
03/24/2026 05 AM PDT 6.99 340 + Normal
03/24/2026 06 AM PDT 6.97 332 - Normal
03/24/2026 07 AM PDT 6.98 336 + Normal
03/24/2026 08 AM PDT 6.98 336 0 Normal
03/24/2026 09 AM PDT 6.97 332 - Normal
03/24/2026 10 AM PDT 6.97 332 0 Normal
03/24/2026 11 AM PDT 6.97 332 0 Normal
03/24/2026 12 PM PDT 6.97 332 0 Normal
03/24/2026 01 PM PDT 6.98 336 + Normal
03/24/2026 02 PM PDT 6.97 332 - Normal
03/24/2026 03 PM PDT 6.97 332 0 Normal
03/24/2026 04 PM PDT 6.98 336 + Normal
03/24/2026 05 PM PDT 6.98 336 0 Normal
03/24/2026 06 PM PDT 6.99 340 + Normal
03/24/2026 07 PM PDT 6.98 336 - Normal
03/24/2026 08 PM PDT 6.98 336 0 Normal
03/24/2026 09 PM PDT 6.98 336 0 Normal
03/24/2026 10 PM PDT 6.97 332 - Normal
03/24/2026 11 PM PDT 6.98 336 + Normal
03/25/2026 12 AM PDT 6.95 324 - Normal
03/25/2026 01 AM PDT 6.95 324 0 Normal
03/25/2026 02 AM PDT 6.94 320 - Normal
03/25/2026 03 AM PDT 6.93 316 - Normal
03/25/2026 04 AM PDT 6.94 320 + Normal
03/25/2026 05 AM PDT 6.93 316 - Normal
03/25/2026 06 AM PDT 6.93 316 0 Normal
03/25/2026 07 AM PDT 6.93 316 0 Normal
03/25/2026 08 AM PDT 6.93 316 0 Normal
03/25/2026 09 AM PDT 6.94 320 + Normal
03/25/2026 10 AM PDT 6.93 316 - Normal
03/25/2026 11 AM PDT 6.92 312 - Normal
03/25/2026 12 PM PDT 6.93 316 + Normal
03/25/2026 01 PM PDT 6.93 316 0 Normal
03/25/2026 02 PM PDT 6.94 320 + Normal
03/25/2026 03 PM PDT 6.93 316 - Normal
03/25/2026 04 PM PDT 6.93 316 0 Normal
03/25/2026 05 PM PDT 6.94 320 + Normal
03/25/2026 06 PM PDT 6.94 320 0 Normal
03/25/2026 07 PM PDT 6.93 316 - Normal
03/25/2026 08 PM PDT 6.94 320 + Normal
03/25/2026 09 PM PDT 6.94 320 0 Normal
03/25/2026 10 PM PDT 6.94 320 0 Normal
03/25/2026 11 PM PDT 6.94 320 0 Normal
03/26/2026 12 AM PDT 6.97 332 + Normal
03/26/2026 01 AM PDT 6.99 340 + Normal
03/26/2026 02 AM PDT 7.01 348 + Normal
03/26/2026 03 AM PDT 7.01 348 0 Normal
03/26/2026 04 AM PDT 7.01 348 0 Normal
03/26/2026 05 AM PDT 7.00 344 - Normal
03/26/2026 06 AM PDT 7.00 344 0 Normal
03/26/2026 07 AM PDT 7.00 344 0 Normal
03/26/2026 08 AM PDT 6.99 340 - Normal
03/26/2026 09 AM PDT 6.99 340 0 Normal
03/26/2026 10 AM PDT 6.98 336 - Normal
03/26/2026 11 AM PDT 6.98 336 0 Normal
03/26/2026 12 PM PDT 6.99 340 + Normal
03/26/2026 01 PM PDT 6.99 340 0 Normal
03/26/2026 02 PM PDT 6.98 336 - Normal
03/26/2026 03 PM PDT 6.98 336 0 Normal
03/26/2026 04 PM PDT 6.99 340 + Normal
03/26/2026 05 PM PDT 6.99 340 0 Normal
03/26/2026 06 PM PDT 7.00 344 + Normal
03/26/2026 07 PM PDT 6.98 336 - Normal
03/26/2026 08 PM PDT 6.98 336 0 Normal
03/26/2026 09 PM PDT 6.98 336 0 Normal
03/26/2026 10 PM PDT 6.97 332 - Normal
03/26/2026 11 PM PDT 6.96 328 - Normal
03/27/2026 12 AM PDT 6.95 324 - Normal
03/27/2026 01 AM PDT 6.93 316 - Normal
03/27/2026 02 AM PDT 6.93 316 0 Normal
03/27/2026 03 AM PDT 6.92 312 - Normal
03/27/2026 04 AM PDT 6.91 308 - Normal
03/27/2026 05 AM PDT 6.91 308 0 Normal
03/27/2026 06 AM PDT 6.90 305 - Normal
03/27/2026 07 AM PDT 6.90 305 0 Normal
03/27/2026 08 AM PDT 6.91 308 + Normal
03/27/2026 09 AM PDT 6.91 308 0 Normal
03/27/2026 10 AM PDT 6.91 308 0 Normal
03/27/2026 11 AM PDT 6.91 308 0 Normal
03/27/2026 12 PM PDT 6.91 308 0 Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
03/27/2026 01 PM PDT 6.91 308 Normal
03/27/2026 02 PM PDT 6.91 308 0 Normal
03/27/2026 03 PM PDT 6.91 308 0 Normal
03/27/2026 04 PM PDT 6.91 308 0 Normal
03/27/2026 05 PM PDT 6.91 308 0 Normal
03/27/2026 06 PM PDT 6.91 308 0 Normal
03/27/2026 07 PM PDT 6.91 308 0 Normal
03/27/2026 08 PM PDT 6.91 308 0 Normal
03/27/2026 09 PM PDT 6.91 308 0 Normal
03/27/2026 10 PM PDT 6.91 308 0 Normal
03/27/2026 11 PM PDT 6.91 308 0 Normal
03/28/2026 12 AM PDT 6.91 308 0 Normal
03/28/2026 01 AM PDT 6.91 308 0 Normal
03/28/2026 02 AM PDT 6.91 308 0 Normal
03/28/2026 03 AM PDT 6.91 308 0 Normal
03/28/2026 04 AM PDT 6.90 305 - Normal
03/28/2026 05 AM PDT 6.90 305 0 Normal
03/28/2026 06 AM PDT 6.90 305 0 Normal
03/28/2026 07 AM PDT 6.90 305 0 Normal
03/28/2026 08 AM PDT 6.90 305 0 Normal
03/28/2026 09 AM PDT 6.89 301 - Normal
03/28/2026 10 AM PDT 6.89 301 0 Normal
03/28/2026 11 AM PDT 6.89 301 0 Normal
03/28/2026 12 PM PDT 6.89 301 0 Normal
03/28/2026 01 PM PDT 6.88 297 - Normal
03/28/2026 02 PM PDT 6.88 297 0 Normal
03/28/2026 03 PM PDT 6.88 297 0 Normal
03/28/2026 04 PM PDT 6.87 293 - Normal
03/28/2026 05 PM PDT 6.87 293 0 Normal
03/28/2026 06 PM PDT 6.87 293 0 Normal
03/28/2026 07 PM PDT 6.87 293 0 Normal
03/28/2026 08 PM PDT 6.86 290 - Normal
03/28/2026 09 PM PDT 6.86 290 0 Normal
03/28/2026 10 PM PDT 6.86 290 0 Normal
03/28/2026 11 PM PDT 6.86 290 0 Normal
03/29/2026 12 AM PDT 6.86 290 0 Normal
03/29/2026 01 AM PDT 6.86 290 0 Normal
03/29/2026 02 AM PDT 6.86 290 0 Normal
03/29/2026 03 AM PDT 6.86 290 0 Normal
03/29/2026 04 AM PDT 6.85 286 - Normal
03/29/2026 05 AM PDT 6.85 286 0 Normal
03/29/2026 06 AM PDT 6.85 286 0 Normal
03/29/2026 07 AM PDT 6.85 286 0 Normal
03/29/2026 08 AM PDT 6.85 286 0 Normal
03/29/2026 09 AM PDT 6.85 286 0 Normal
03/29/2026 10 AM PDT 6.85 286 0 Normal
03/29/2026 11 AM PDT 6.86 290 + Normal
03/29/2026 12 PM PDT 6.86 290 0 Normal
03/29/2026 01 PM PDT 6.86 290 0 Normal
03/29/2026 02 PM PDT 6.86 290 0 Normal
03/29/2026 03 PM PDT 6.86 290 0 Normal
03/29/2026 04 PM PDT 6.86 290 0 Normal
03/29/2026 05 PM PDT 6.86 290 0 Normal
03/29/2026 06 PM PDT 6.86 290 0 Normal
03/29/2026 07 PM PDT 6.86 290 0 Normal
03/29/2026 08 PM PDT 6.86 290 0 Normal
03/29/2026 09 PM PDT 6.86 290 0 Normal
03/29/2026 10 PM PDT 6.86 290 0 Normal
03/29/2026 11 PM PDT 6.86 290 0 Normal
03/30/2026 12 AM PDT 6.86 290 0 Normal
03/30/2026 01 AM PDT 6.86 290 0 Normal
03/30/2026 02 AM PDT 6.86 290 0 Normal
03/30/2026 03 AM PDT 6.86 290 0 Normal
03/30/2026 04 AM PDT 6.86 290 0 Normal
03/30/2026 05 AM PDT 6.86 290 0 Normal
03/30/2026 06 AM PDT 6.86 290 0 Normal
03/30/2026 07 AM PDT 6.86 290 0 Normal
03/30/2026 08 AM PDT 6.86 290 0 Normal
03/30/2026 09 AM PDT 6.86 290 0 Normal
03/30/2026 10 AM PDT 6.86 290 0 Normal
03/30/2026 11 AM PDT 6.86 290 0 Normal
03/30/2026 12 PM PDT 6.86 290 0 Normal
03/30/2026 01 PM PDT 6.86 290 0 Normal
03/30/2026 02 PM PDT 6.86 290 0 Normal
03/30/2026 03 PM PDT 6.86 290 0 Normal
03/30/2026 04 PM PDT 6.86 290 0 Normal
03/30/2026 05 PM PDT 6.86 290 0 Normal
03/30/2026 06 PM PDT 6.86 290 0 Normal
03/30/2026 07 PM PDT 6.86 290 0 Normal
03/30/2026 08 PM PDT 6.86 290 0 Normal
03/30/2026 09 PM PDT 6.86 290 0 Normal
03/30/2026 10 PM PDT 6.86 290 0 Normal
03/30/2026 11 PM PDT 6.86 290 0 Normal
03/31/2026 12 AM PDT 6.86 290 0 Normal
03/31/2026 01 AM PDT 6.86 290 0 Normal
03/31/2026 02 AM PDT 6.86 290 0 Normal
03/31/2026 03 AM PDT 6.86 290 0 Normal
03/31/2026 04 AM PDT 6.86 290 0 Normal
03/31/2026 05 AM PDT 6.86 290 0 Normal
03/31/2026 06 AM PDT 6.86 290 0 Normal
03/31/2026 07 AM PDT 6.87 293 + Normal
03/31/2026 08 AM PDT 6.87 293 0 Normal
03/31/2026 09 AM PDT 6.87 293 0 Normal
03/31/2026 10 AM PDT 6.87 293 0 Normal
03/31/2026 11 AM PDT 6.87 293 0 Normal
03/31/2026 12 PM PDT 6.87 293 0 Normal
03/31/2026 01 PM PDT 6.87 293 0 Normal
03/31/2026 02 PM PDT 6.87 293 0 Normal
03/31/2026 03 PM PDT 6.87 293 0 Normal
03/31/2026 04 PM PDT 6.87 293 0 Normal
03/31/2026 05 PM PDT 6.87 293 0 Normal
03/31/2026 06 PM PDT 6.87 293 0 Normal
03/31/2026 07 PM PDT 6.87 293 0 Normal
03/31/2026 08 PM PDT 6.87 293 0 Normal
03/31/2026 09 PM PDT 6.87 293 0 Normal
03/31/2026 10 PM PDT 6.87 293 0 Normal
03/31/2026 11 PM PDT 6.87 293 0 Normal
04/01/2026 12 AM PDT 6.87 293 0 Normal
04/01/2026 01 AM PDT 6.87 293 0 Normal
04/01/2026 02 AM PDT 6.87 293 0 Normal
04/01/2026 03 AM PDT 6.87 293 0 Normal
04/01/2026 04 AM PDT 6.87 293 0 Normal
04/01/2026 05 AM PDT 6.87 293 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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