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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 11 2026 at 8:35 AM PDT | Next Issuance: | Apr 12 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: 04/11/2026 at 08:35 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 04/11/2026 at 08:00 AM PDT
# Maximum Observed Stage: 7.25 Feet
# Maximum Observed Flow: 450 cfs
#
# Earliest Date & Time of Maximum Forecast: 04/12/2026 at 02:00 AM PDT
# Maximum Forecast Stage: 9.68 Feet
# Maximum Forecast Flow: 2579 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
04/06/2026 08 AM PDT 7.00 344 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 6.85 286 - Normal
04/08/2026 08 AM PDT 6.84 282 - Normal
04/08/2026 09 AM PDT 6.84 282 0 Normal
04/08/2026 10 AM PDT 6.84 282 0 Normal
04/08/2026 11 AM PDT 6.84 282 0 Normal
04/08/2026 12 PM PDT 6.84 282 0 Normal
04/08/2026 01 PM PDT 6.84 282 0 Normal
04/08/2026 02 PM PDT 6.83 279 - Normal
04/08/2026 03 PM PDT 6.83 279 0 Normal
04/08/2026 04 PM PDT 6.83 279 0 Normal
04/08/2026 05 PM PDT 6.84 282 + Normal
04/08/2026 06 PM PDT 6.84 282 0 Normal
04/08/2026 07 PM PDT 6.84 282 0 Normal
04/08/2026 08 PM PDT 6.84 282 0 Normal
04/08/2026 09 PM PDT 6.83 279 - Normal
04/08/2026 10 PM PDT 6.83 279 0 Normal
04/08/2026 11 PM PDT 6.82 275 - Normal
04/09/2026 12 AM PDT 6.80 268 - Normal
04/09/2026 01 AM PDT 6.80 268 0 Normal
04/09/2026 02 AM PDT 6.79 264 - Normal
04/09/2026 03 AM PDT 6.79 264 0 Normal
04/09/2026 04 AM PDT 6.78 261 - Normal
04/09/2026 05 AM PDT 6.79 264 + Normal
04/09/2026 06 AM PDT 6.78 261 - Normal
04/09/2026 07 AM PDT 6.78 261 0 Normal
04/09/2026 08 AM PDT 6.77 257 - Normal
04/09/2026 09 AM PDT 6.77 257 0 Normal
04/09/2026 10 AM PDT 6.76 254 - Normal
04/09/2026 11 AM PDT 6.77 257 + Normal
04/09/2026 12 PM PDT 6.77 257 0 Normal
04/09/2026 01 PM PDT 6.79 264 + Normal
04/09/2026 02 PM PDT 6.79 264 0 Normal
04/09/2026 03 PM PDT 6.78 261 - Normal
04/09/2026 04 PM PDT 6.79 264 + Normal
04/09/2026 05 PM PDT 6.79 264 0 Normal
04/09/2026 06 PM PDT 6.81 271 + Normal
04/09/2026 07 PM PDT 6.82 275 + Normal
04/09/2026 08 PM PDT 6.83 279 + Normal
04/09/2026 09 PM PDT 6.83 279 0 Normal
04/09/2026 10 PM PDT 6.83 279 0 Normal
04/09/2026 11 PM PDT 6.82 275 - Normal
04/10/2026 12 AM PDT 6.81 271 - Normal
04/10/2026 01 AM PDT 6.81 271 0 Normal
04/10/2026 02 AM PDT 6.82 275 + Normal
04/10/2026 03 AM PDT 6.84 282 + Normal
04/10/2026 04 AM PDT 6.88 297 + Normal
04/10/2026 05 AM PDT 6.88 297 0 Normal
04/10/2026 06 AM PDT 6.90 305 + Normal
04/10/2026 07 AM PDT 6.90 305 0 Normal
04/10/2026 08 AM PDT 6.92 312 + Normal
04/10/2026 09 AM PDT 6.92 312 0 Normal
04/10/2026 10 AM PDT 6.93 316 + Normal
04/10/2026 11 AM PDT 6.94 320 + Normal
04/10/2026 12 PM PDT 6.96 328 + Normal
04/10/2026 01 PM PDT 6.97 332 + Normal
04/10/2026 02 PM PDT 6.99 340 + Normal
04/10/2026 03 PM PDT 6.98 336 - Normal
04/10/2026 04 PM PDT 6.97 332 - Normal
04/10/2026 05 PM PDT 6.99 340 + Normal
04/10/2026 06 PM PDT 7.00 344 + Normal
04/10/2026 07 PM PDT 7.03 357 + Normal
04/10/2026 08 PM PDT 7.03 357 0 Normal
04/10/2026 09 PM PDT 7.04 361 + Normal
04/10/2026 10 PM PDT 7.06 369 + Normal
04/10/2026 11 PM PDT 7.08 378 + Normal
04/11/2026 12 AM PDT 7.09 382 + Normal
04/11/2026 01 AM PDT 7.11 391 + Normal
04/11/2026 02 AM PDT 7.13 400 + Normal
04/11/2026 03 AM PDT 7.17 416 + Normal
04/11/2026 04 AM PDT 7.20 429 + Normal
04/11/2026 05 AM PDT 7.19 425 - Normal
04/11/2026 06 AM PDT 7.21 433 + Normal
04/11/2026 07 AM PDT 7.22 437 + Normal
04/11/2026 08 AM PDT 7.25 450 + Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
04/11/2026 09 AM PDT 7.28 463 Normal
04/11/2026 10 AM PDT 7.31 476 + Normal
04/11/2026 11 AM PDT 7.35 494 + Normal
04/11/2026 12 PM PDT 7.40 517 + Normal
04/11/2026 01 PM PDT 7.46 545 + Normal
04/11/2026 02 PM PDT 7.55 589 + Normal
04/11/2026 03 PM PDT 7.72 677 + Normal
04/11/2026 04 PM PDT 8.02 878 + Normal
04/11/2026 05 PM PDT 8.44 1214 + Normal
04/11/2026 06 PM PDT 8.80 1555 + Normal
04/11/2026 07 PM PDT 9.07 1844 + Normal
04/11/2026 08 PM PDT 9.26 2061 + Normal
04/11/2026 09 PM PDT 9.40 2228 + Normal
04/11/2026 10 PM PDT 9.50 2350 + Normal
04/11/2026 11 PM PDT 9.57 2438 + Normal
04/12/2026 12 AM PDT 9.63 2514 + Normal
04/12/2026 01 AM PDT 9.66 2553 + Normal
04/12/2026 02 AM PDT 9.68 2579 + Normal
04/12/2026 03 AM PDT 9.68 2579 0 Normal
04/12/2026 04 AM PDT 9.65 2540 - Normal
04/12/2026 05 AM PDT 9.62 2502 - Normal
04/12/2026 06 AM PDT 9.58 2451 - Normal
04/12/2026 07 AM PDT 9.54 2400 - Normal
04/12/2026 08 AM PDT 9.50 2350 - Normal
04/12/2026 09 AM PDT 9.45 2289 - Normal
04/12/2026 10 AM PDT 9.40 2228 - Normal
04/12/2026 11 AM PDT 9.34 2155 - Normal
04/12/2026 12 PM PDT 9.28 2084 - Normal
04/12/2026 01 PM PDT 9.23 2026 - Normal
04/12/2026 02 PM PDT 9.18 1968 - Normal
04/12/2026 03 PM PDT 9.12 1900 - Normal
04/12/2026 04 PM PDT 9.06 1833 - Normal
04/12/2026 05 PM PDT 8.99 1756 - Normal
04/12/2026 06 PM PDT 8.93 1691 - Normal
04/12/2026 07 PM PDT 8.87 1628 - Normal
04/12/2026 08 PM PDT 8.83 1586 - Normal
04/12/2026 09 PM PDT 8.80 1555 - Normal
04/12/2026 10 PM PDT 8.79 1545 - Normal
04/12/2026 11 PM PDT 8.78 1534 - Normal
04/13/2026 12 AM PDT 8.78 1534 0 Normal
04/13/2026 01 AM PDT 8.77 1524 - Normal
04/13/2026 02 AM PDT 8.77 1524 0 Normal
04/13/2026 03 AM PDT 8.76 1514 - Normal
04/13/2026 04 AM PDT 8.73 1484 - Normal
04/13/2026 05 AM PDT 8.70 1454 - Normal
04/13/2026 06 AM PDT 8.67 1424 - Normal
04/13/2026 07 AM PDT 8.64 1395 - Normal
04/13/2026 08 AM PDT 8.61 1367 - Normal
04/13/2026 09 AM PDT 8.59 1348 - Normal
04/13/2026 10 AM PDT 8.57 1330 - Normal
04/13/2026 11 AM PDT 8.55 1312 - Normal
04/13/2026 12 PM PDT 8.53 1294 - Normal
04/13/2026 01 PM PDT 8.52 1285 - Normal
04/13/2026 02 PM PDT 8.51 1276 - Normal
04/13/2026 03 PM PDT 8.50 1267 - Normal
04/13/2026 04 PM PDT 8.49 1258 - Normal
04/13/2026 05 PM PDT 8.49 1258 0 Normal
04/13/2026 06 PM PDT 8.48 1249 - Normal
04/13/2026 07 PM PDT 8.48 1249 0 Normal
04/13/2026 08 PM PDT 8.47 1240 - Normal
04/13/2026 09 PM PDT 8.47 1240 0 Normal
04/13/2026 10 PM PDT 8.47 1240 0 Normal
04/13/2026 11 PM PDT 8.47 1240 0 Normal
04/14/2026 12 AM PDT 8.47 1240 0 Normal
04/14/2026 01 AM PDT 8.46 1232 - Normal
04/14/2026 02 AM PDT 8.46 1232 0 Normal
04/14/2026 03 AM PDT 8.46 1232 0 Normal
04/14/2026 04 AM PDT 8.46 1232 0 Normal
04/14/2026 05 AM PDT 8.45 1223 - Normal
04/14/2026 06 AM PDT 8.44 1214 - Normal
04/14/2026 07 AM PDT 8.44 1214 0 Normal
04/14/2026 08 AM PDT 8.43 1205 - Normal
04/14/2026 09 AM PDT 8.42 1197 - Normal
04/14/2026 10 AM PDT 8.41 1188 - Normal
04/14/2026 11 AM PDT 8.40 1180 - Normal
04/14/2026 12 PM PDT 8.39 1171 - Normal
04/14/2026 01 PM PDT 8.38 1163 - Normal
04/14/2026 02 PM PDT 8.37 1154 - Normal
04/14/2026 03 PM PDT 8.36 1146 - Normal
04/14/2026 04 PM PDT 8.35 1137 - Normal
04/14/2026 05 PM PDT 8.33 1121 - Normal
04/14/2026 06 PM PDT 8.32 1112 - Normal
04/14/2026 07 PM PDT 8.31 1104 - Normal
04/14/2026 08 PM PDT 8.30 1096 - Normal
04/14/2026 09 PM PDT 8.29 1088 - Normal
04/14/2026 10 PM PDT 8.29 1088 0 Normal
04/14/2026 11 PM PDT 8.27 1071 - Normal
04/15/2026 12 AM PDT 8.26 1063 - Normal
04/15/2026 01 AM PDT 8.25 1055 - Normal
04/15/2026 02 AM PDT 8.25 1055 0 Normal
04/15/2026 03 AM PDT 8.24 1047 - Normal
04/15/2026 04 AM PDT 8.23 1039 - Normal
04/15/2026 05 AM PDT 8.22 1031 - Normal
04/15/2026 06 AM PDT 8.22 1031 0 Normal
04/15/2026 07 AM PDT 8.21 1023 - Normal
04/15/2026 08 AM PDT 8.20 1015 - Normal
04/15/2026 09 AM PDT 8.19 1007 - Normal
04/15/2026 10 AM PDT 8.19 1007 0 Normal
04/15/2026 11 AM PDT 8.18 999 - Normal
04/15/2026 12 PM PDT 8.17 992 - Normal
04/15/2026 01 PM PDT 8.17 992 0 Normal
04/15/2026 02 PM PDT 8.16 984 - Normal
04/15/2026 03 PM PDT 8.16 984 0 Normal
04/15/2026 04 PM PDT 8.15 976 - Normal
04/15/2026 05 PM PDT 8.15 976 0 Normal
04/15/2026 06 PM PDT 8.14 968 - Normal
04/15/2026 07 PM PDT 8.13 961 - Normal
04/15/2026 08 PM PDT 8.13 961 0 Normal
04/15/2026 09 PM PDT 8.13 961 0 Normal
04/15/2026 10 PM PDT 8.13 961 0 Normal
04/15/2026 11 PM PDT 8.14 968 + Normal
04/16/2026 12 AM PDT 8.15 976 + Normal
04/16/2026 01 AM PDT 8.17 992 + Normal
04/16/2026 02 AM PDT 8.18 999 + Normal
04/16/2026 03 AM PDT 8.20 1015 + Normal
04/16/2026 04 AM PDT 8.23 1039 + Normal
04/16/2026 05 AM PDT 8.26 1063 + 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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