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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 13 2026 at 7:17 AM PDT | Next Issuance: | May 14 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: 05/13/2026 at 07:19 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 05/08/2026 at 07:00 PM PDT
# Maximum Observed Stage: 6.83 Feet
# Maximum Observed Flow: 310 cfs
#
# Earliest Date & Time of Maximum Forecast: 05/13/2026 at 08:00 AM PDT
# Maximum Forecast Stage: 6.60 Feet
# Maximum Forecast Flow: 234 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
05/08/2026 07 AM PDT 6.82 307 Normal
05/08/2026 08 AM PDT 6.82 307 0 Normal
05/08/2026 09 AM PDT 6.81 303 - Normal
05/08/2026 10 AM PDT 6.81 303 0 Normal
05/08/2026 11 AM PDT 6.82 307 + Normal
05/08/2026 12 PM PDT 6.82 307 0 Normal
05/08/2026 01 PM PDT 6.82 307 0 Normal
05/08/2026 02 PM PDT 6.82 307 0 Normal
05/08/2026 03 PM PDT 6.82 307 0 Normal
05/08/2026 04 PM PDT 6.83 310 + Normal
05/08/2026 05 PM PDT 6.83 310 0 Normal
05/08/2026 06 PM PDT 6.83 310 0 Normal
05/08/2026 07 PM PDT 6.83 310 0 Normal
05/08/2026 08 PM PDT 6.82 307 - Normal
05/08/2026 09 PM PDT 6.82 307 0 Normal
05/08/2026 10 PM PDT 6.81 303 - Normal
05/08/2026 11 PM PDT 6.80 300 - Normal
05/09/2026 12 AM PDT 6.79 296 - Normal
05/09/2026 01 AM PDT 6.78 293 - Normal
05/09/2026 02 AM PDT 6.78 293 0 Normal
05/09/2026 03 AM PDT 6.77 289 - Normal
05/09/2026 04 AM PDT 6.77 289 0 Normal
05/09/2026 05 AM PDT 6.77 289 0 Normal
05/09/2026 06 AM PDT 6.76 286 - Normal
05/09/2026 07 AM PDT 6.76 286 0 Normal
05/09/2026 08 AM PDT 6.77 289 + Normal
05/09/2026 09 AM PDT 6.77 289 0 Normal
05/09/2026 10 AM PDT 6.75 283 - Normal
05/09/2026 11 AM PDT 6.75 283 0 Normal
05/09/2026 12 PM PDT 6.76 286 + Normal
05/09/2026 01 PM PDT 6.76 286 0 Normal
05/09/2026 02 PM PDT 6.76 286 0 Normal
05/09/2026 03 PM PDT 6.76 286 0 Normal
05/09/2026 04 PM PDT 6.77 289 + Normal
05/09/2026 05 PM PDT 6.77 289 0 Normal
05/09/2026 06 PM PDT 6.77 289 0 Normal
05/09/2026 07 PM PDT 6.77 289 0 Normal
05/09/2026 08 PM PDT 6.76 286 - Normal
05/09/2026 09 PM PDT 6.76 286 0 Normal
05/09/2026 10 PM PDT 6.75 283 - Normal
05/09/2026 11 PM PDT 6.75 283 0 Normal
05/10/2026 12 AM PDT 6.74 279 - Normal
05/10/2026 01 AM PDT 6.73 276 - Normal
05/10/2026 02 AM PDT 6.72 273 - Normal
05/10/2026 03 AM PDT 6.72 273 0 Normal
05/10/2026 04 AM PDT 6.71 270 - Normal
05/10/2026 05 AM PDT 6.72 273 + Normal
05/10/2026 06 AM PDT 6.72 273 0 Normal
05/10/2026 07 AM PDT 6.71 270 - Normal
05/10/2026 08 AM PDT 6.71 270 0 Normal
05/10/2026 09 AM PDT 6.71 270 0 Normal
05/10/2026 10 AM PDT 6.71 270 0 Normal
05/10/2026 11 AM PDT 6.72 273 + Normal
05/10/2026 12 PM PDT 6.71 270 - Normal
05/10/2026 01 PM PDT 6.71 270 0 Normal
05/10/2026 02 PM PDT 6.71 270 0 Normal
05/10/2026 03 PM PDT 6.70 266 - Normal
05/10/2026 04 PM PDT 6.71 270 + Normal
05/10/2026 05 PM PDT 6.72 273 + Normal
05/10/2026 06 PM PDT 6.72 273 0 Normal
05/10/2026 07 PM PDT 6.72 273 0 Normal
05/10/2026 08 PM PDT 6.72 273 0 Normal
05/10/2026 09 PM PDT 6.72 273 0 Normal
05/10/2026 10 PM PDT 6.71 270 - Normal
05/10/2026 11 PM PDT 6.70 266 - Normal
05/11/2026 12 AM PDT 6.68 260 - Normal
05/11/2026 01 AM PDT 6.68 260 0 Normal
05/11/2026 02 AM PDT 6.67 257 - Normal
05/11/2026 03 AM PDT 6.67 257 0 Normal
05/11/2026 04 AM PDT 6.67 257 0 Normal
05/11/2026 05 AM PDT 6.67 257 0 Normal
05/11/2026 06 AM PDT 6.67 257 0 Normal
05/11/2026 07 AM PDT 6.67 257 0 Normal
05/11/2026 08 AM PDT 6.65 250 - Normal
05/11/2026 09 AM PDT 6.65 250 0 Normal
05/11/2026 10 AM PDT 6.65 250 0 Normal
05/11/2026 11 AM PDT 6.65 250 0 Normal
05/11/2026 12 PM PDT 6.66 254 + Normal
05/11/2026 01 PM PDT 6.67 257 + Normal
05/11/2026 02 PM PDT 6.66 254 - Normal
05/11/2026 03 PM PDT 6.66 254 0 Normal
05/11/2026 04 PM PDT 6.66 254 0 Normal
05/11/2026 05 PM PDT 6.67 257 + Normal
05/11/2026 06 PM PDT 6.67 257 0 Normal
05/11/2026 07 PM PDT 6.67 257 0 Normal
05/11/2026 08 PM PDT 6.67 257 0 Normal
05/11/2026 09 PM PDT 6.68 260 + Normal
05/11/2026 10 PM PDT 6.67 257 - Normal
05/11/2026 11 PM PDT 6.66 254 - Normal
05/12/2026 12 AM PDT 6.64 247 - Normal
05/12/2026 01 AM PDT 6.63 244 - Normal
05/12/2026 02 AM PDT 6.63 244 0 Normal
05/12/2026 03 AM PDT 6.62 240 - Normal
05/12/2026 04 AM PDT 6.62 240 0 Normal
05/12/2026 05 AM PDT 6.61 237 - Normal
05/12/2026 06 AM PDT 6.62 240 + Normal
05/12/2026 07 AM PDT 6.62 240 0 Normal
05/12/2026 08 AM PDT 6.62 240 0 Normal
05/12/2026 09 AM PDT 6.62 240 0 Normal
05/12/2026 10 AM PDT 6.61 237 - Normal
05/12/2026 11 AM PDT 6.62 240 + Normal
05/12/2026 12 PM PDT 6.61 237 - Normal
05/12/2026 01 PM PDT 6.62 240 + Normal
05/12/2026 02 PM PDT 6.62 240 0 Normal
05/12/2026 03 PM PDT 6.61 237 - Normal
05/12/2026 04 PM PDT 6.62 240 + Normal
05/12/2026 05 PM PDT 6.63 244 + Normal
05/12/2026 06 PM PDT 6.63 244 0 Normal
05/12/2026 07 PM PDT 6.63 244 0 Normal
05/12/2026 08 PM PDT 6.63 244 0 Normal
05/12/2026 09 PM PDT 6.63 244 0 Normal
05/12/2026 10 PM PDT 6.62 240 - Normal
05/12/2026 11 PM PDT 6.60 234 - Normal
05/13/2026 12 AM PDT 6.59 230 - Normal
05/13/2026 01 AM PDT 6.59 230 0 Normal
05/13/2026 02 AM PDT 6.60 234 + Normal
05/13/2026 03 AM PDT 6.60 234 0 Normal
05/13/2026 04 AM PDT 6.60 234 0 Normal
05/13/2026 05 AM PDT 6.60 234 0 Normal
05/13/2026 06 AM PDT 6.60 234 0 Normal
05/13/2026 07 AM PDT 6.60 234 0 Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
05/13/2026 08 AM PDT 6.60 234 Normal
05/13/2026 09 AM PDT 6.60 234 0 Normal
05/13/2026 10 AM PDT 6.60 234 0 Normal
05/13/2026 11 AM PDT 6.59 230 - Normal
05/13/2026 12 PM PDT 6.59 230 0 Normal
05/13/2026 01 PM PDT 6.59 230 0 Normal
05/13/2026 02 PM PDT 6.59 230 0 Normal
05/13/2026 03 PM PDT 6.59 230 0 Normal
05/13/2026 04 PM PDT 6.59 230 0 Normal
05/13/2026 05 PM PDT 6.59 230 0 Normal
05/13/2026 06 PM PDT 6.59 230 0 Normal
05/13/2026 07 PM PDT 6.59 230 0 Normal
05/13/2026 08 PM PDT 6.59 230 0 Normal
05/13/2026 09 PM PDT 6.59 230 0 Normal
05/13/2026 10 PM PDT 6.59 230 0 Normal
05/13/2026 11 PM PDT 6.59 230 0 Normal
05/14/2026 12 AM PDT 6.59 230 0 Normal
05/14/2026 01 AM PDT 6.59 230 0 Normal
05/14/2026 02 AM PDT 6.59 230 0 Normal
05/14/2026 03 AM PDT 6.59 230 0 Normal
05/14/2026 04 AM PDT 6.58 227 - Normal
05/14/2026 05 AM PDT 6.58 227 0 Normal
05/14/2026 06 AM PDT 6.58 227 0 Normal
05/14/2026 07 AM PDT 6.58 227 0 Normal
05/14/2026 08 AM PDT 6.58 227 0 Normal
05/14/2026 09 AM PDT 6.58 227 0 Normal
05/14/2026 10 AM PDT 6.58 227 0 Normal
05/14/2026 11 AM PDT 6.58 227 0 Normal
05/14/2026 12 PM PDT 6.57 224 - Normal
05/14/2026 01 PM PDT 6.57 224 0 Normal
05/14/2026 02 PM PDT 6.57 224 0 Normal
05/14/2026 03 PM PDT 6.57 224 0 Normal
05/14/2026 04 PM PDT 6.57 224 0 Normal
05/14/2026 05 PM PDT 6.56 221 - Normal
05/14/2026 06 PM PDT 6.56 221 0 Normal
05/14/2026 07 PM PDT 6.56 221 0 Normal
05/14/2026 08 PM PDT 6.56 221 0 Normal
05/14/2026 09 PM PDT 6.56 221 0 Normal
05/14/2026 10 PM PDT 6.56 221 0 Normal
05/14/2026 11 PM PDT 6.56 221 0 Normal
05/15/2026 12 AM PDT 6.55 218 - Normal
05/15/2026 01 AM PDT 6.55 218 0 Normal
05/15/2026 02 AM PDT 6.55 218 0 Normal
05/15/2026 03 AM PDT 6.55 218 0 Normal
05/15/2026 04 AM PDT 6.55 218 0 Normal
05/15/2026 05 AM PDT 6.54 215 - Normal
05/15/2026 06 AM PDT 6.54 215 0 Normal
05/15/2026 07 AM PDT 6.54 215 0 Normal
05/15/2026 08 AM PDT 6.54 215 0 Normal
05/15/2026 09 AM PDT 6.54 215 0 Normal
05/15/2026 10 AM PDT 6.54 215 0 Normal
05/15/2026 11 AM PDT 6.53 211 - Normal
05/15/2026 12 PM PDT 6.53 211 0 Normal
05/15/2026 01 PM PDT 6.53 211 0 Normal
05/15/2026 02 PM PDT 6.53 211 0 Normal
05/15/2026 03 PM PDT 6.52 208 - Normal
05/15/2026 04 PM PDT 6.52 208 0 Normal
05/15/2026 05 PM PDT 6.52 208 0 Normal
05/15/2026 06 PM PDT 6.52 208 0 Normal
05/15/2026 07 PM PDT 6.51 205 - Normal
05/15/2026 08 PM PDT 6.51 205 0 Normal
05/15/2026 09 PM PDT 6.51 205 0 Normal
05/15/2026 10 PM PDT 6.51 205 0 Normal
05/15/2026 11 PM PDT 6.51 205 0 Normal
05/16/2026 12 AM PDT 6.50 202 - Normal
05/16/2026 01 AM PDT 6.50 202 0 Normal
05/16/2026 02 AM PDT 6.50 202 0 Normal
05/16/2026 03 AM PDT 6.50 202 0 Normal
05/16/2026 04 AM PDT 6.50 202 0 Normal
05/16/2026 05 AM PDT 6.49 199 - Normal
05/16/2026 06 AM PDT 6.49 199 0 Normal
05/16/2026 07 AM PDT 6.49 199 0 Normal
05/16/2026 08 AM PDT 6.49 199 0 Normal
05/16/2026 09 AM PDT 6.49 199 0 Normal
05/16/2026 10 AM PDT 6.48 196 - Normal
05/16/2026 11 AM PDT 6.48 196 0 Normal
05/16/2026 12 PM PDT 6.48 196 0 Normal
05/16/2026 01 PM PDT 6.48 196 0 Normal
05/16/2026 02 PM PDT 6.48 196 0 Normal
05/16/2026 03 PM PDT 6.47 193 - Normal
05/16/2026 04 PM PDT 6.47 193 0 Normal
05/16/2026 05 PM PDT 6.47 193 0 Normal
05/16/2026 06 PM PDT 6.47 193 0 Normal
05/16/2026 07 PM PDT 6.47 193 0 Normal
05/16/2026 08 PM PDT 6.47 193 0 Normal
05/16/2026 09 PM PDT 6.47 193 0 Normal
05/16/2026 10 PM PDT 6.47 193 0 Normal
05/16/2026 11 PM PDT 6.47 193 0 Normal
05/17/2026 12 AM PDT 6.47 193 0 Normal
05/17/2026 01 AM PDT 6.47 193 0 Normal
05/17/2026 02 AM PDT 6.47 193 0 Normal
05/17/2026 03 AM PDT 6.46 190 - Normal
05/17/2026 04 AM PDT 6.46 190 0 Normal
05/17/2026 05 AM PDT 6.46 190 0 Normal
05/17/2026 06 AM PDT 6.46 190 0 Normal
05/17/2026 07 AM PDT 6.46 190 0 Normal
05/17/2026 08 AM PDT 6.46 190 0 Normal
05/17/2026 09 AM PDT 6.46 190 0 Normal
05/17/2026 10 AM PDT 6.46 190 0 Normal
05/17/2026 11 AM PDT 6.46 190 0 Normal
05/17/2026 12 PM PDT 6.46 190 0 Normal
05/17/2026 01 PM PDT 6.46 190 0 Normal
05/17/2026 02 PM PDT 6.46 190 0 Normal
05/17/2026 03 PM PDT 6.45 188 - Normal
05/17/2026 04 PM PDT 6.45 188 0 Normal
05/17/2026 05 PM PDT 6.45 188 0 Normal
05/17/2026 06 PM PDT 6.45 188 0 Normal
05/17/2026 07 PM PDT 6.45 188 0 Normal
05/17/2026 08 PM PDT 6.45 188 0 Normal
05/17/2026 09 PM PDT 6.45 188 0 Normal
05/17/2026 10 PM PDT 6.45 188 0 Normal
05/17/2026 11 PM PDT 6.45 188 0 Normal
05/18/2026 12 AM PDT 6.45 188 0 Normal
05/18/2026 01 AM PDT 6.45 188 0 Normal
05/18/2026 02 AM PDT 6.45 188 0 Normal
05/18/2026 03 AM PDT 6.45 188 0 Normal
05/18/2026 04 AM PDT 6.45 188 0 Normal
05/18/2026 05 AM PDT 6.45 188 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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