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NAPA RIVER - SAINT HELENA (SHEC1)
| Latitude: 38.51º N | Longitude: 122.45º W | Elevation: 195 Feet | | Forecast Type: Official Location |
| Location: Napa County in California | Bulletin Group: Russian Napa | River Group: Russian Napa |
| Issuance Time: | Apr 11 2026 at 8:32 AM PDT | Next Issuance: | Apr 12 2026 at 9:00 AM PDT
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| Action/Monitor: 16.0 Feet | Minor Flood: 18.0 Feet | Moderate Flood: 20.0 Feet | Major Flood: 22.0 Feet |
# Tabular Observed and Forecast Hydrograph Information
#
# Location: Napa River - Saint Helena (SHEC1)
#
# File Generation Time: 04/11/2026 at 08:32 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 04/10/2026 at 02:00 PM PDT
# Maximum Observed Stage: 2.03 Feet
# Maximum Observed Flow: 43 cfs
#
# Earliest Date & Time of Maximum Forecast: 04/12/2026 at 01:00 PM PDT
# Maximum Forecast Stage: 3.90 Feet
# Maximum Forecast Flow: 467 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
04/06/2026 08 AM PDT 1.79 16 Normal
04/06/2026 09 AM PDT 1.79 16 0 Normal
04/06/2026 10 AM PDT 1.79 16 0 Normal
04/06/2026 11 AM PDT 1.79 16 0 Normal
04/06/2026 12 PM PDT 1.79 16 0 Normal
04/06/2026 01 PM PDT 1.79 16 0 Normal
04/06/2026 02 PM PDT 1.79 16 0 Normal
04/06/2026 03 PM PDT 1.79 16 0 Normal
04/06/2026 04 PM PDT 1.78 15 - Normal
04/06/2026 05 PM PDT 1.78 15 0 Normal
04/06/2026 06 PM PDT 1.78 15 0 Normal
04/06/2026 07 PM PDT 1.78 15 0 Normal
04/06/2026 08 PM PDT 1.78 15 0 Normal
04/06/2026 09 PM PDT 1.78 15 0 Normal
04/06/2026 10 PM PDT 1.78 15 0 Normal
04/06/2026 11 PM PDT 1.78 15 0 Normal
04/07/2026 12 AM PDT 1.78 15 0 Normal
04/07/2026 01 AM PDT 1.78 15 0 Normal
04/07/2026 02 AM PDT 1.78 15 0 Normal
04/07/2026 03 AM PDT 1.78 15 0 Normal
04/07/2026 04 AM PDT 1.78 15 0 Normal
04/07/2026 05 AM PDT 1.78 15 0 Normal
04/07/2026 06 AM PDT 1.78 15 0 Normal
04/07/2026 07 AM PDT 1.78 15 0 Normal
04/07/2026 08 AM PDT 1.78 15 0 Normal
04/07/2026 09 AM PDT 1.78 15 0 Normal
04/07/2026 10 AM PDT 1.78 15 0 Normal
04/07/2026 11 AM PDT 1.78 15 0 Normal
04/07/2026 12 PM PDT 1.78 15 0 Normal
04/07/2026 01 PM PDT 1.78 15 0 Normal
04/07/2026 02 PM PDT 1.78 15 0 Normal
04/07/2026 03 PM PDT 1.78 15 0 Normal
04/07/2026 04 PM PDT 1.78 15 0 Normal
04/07/2026 05 PM PDT 1.78 15 0 Normal
04/07/2026 06 PM PDT 1.78 15 0 Normal
04/07/2026 07 PM PDT 1.78 15 0 Normal
04/07/2026 08 PM PDT 1.78 15 0 Normal
04/07/2026 09 PM PDT 1.78 15 0 Normal
04/07/2026 10 PM PDT 1.78 15 0 Normal
04/07/2026 11 PM PDT 1.78 15 0 Normal
04/08/2026 12 AM PDT 1.78 15 0 Normal
04/08/2026 01 AM PDT 1.78 15 0 Normal
04/08/2026 02 AM PDT 1.78 15 0 Normal
04/08/2026 03 AM PDT 1.78 15 0 Normal
04/08/2026 04 AM PDT 1.78 15 0 Normal
04/08/2026 05 AM PDT 1.78 15 0 Normal
04/08/2026 06 AM PDT 1.78 15 0 Normal
04/08/2026 07 AM PDT 1.78 15 0 Normal
04/08/2026 08 AM PDT 1.78 15 0 Normal
04/08/2026 09 AM PDT 1.78 15 0 Normal
04/08/2026 10 AM PDT 1.78 15 0 Normal
04/08/2026 11 AM PDT 1.78 15 0 Normal
04/08/2026 12 PM PDT 1.78 15 0 Normal
04/08/2026 01 PM PDT 1.78 15 0 Normal
04/08/2026 02 PM PDT 1.78 15 0 Normal
04/08/2026 03 PM PDT 1.77 14 - Normal
04/08/2026 04 PM PDT 1.77 14 0 Normal
04/08/2026 05 PM PDT 1.78 15 + Normal
04/08/2026 06 PM PDT 1.78 15 0 Normal
04/08/2026 07 PM PDT 1.77 14 - Normal
04/08/2026 08 PM PDT 1.77 14 0 Normal
04/08/2026 09 PM PDT 1.77 14 0 Normal
04/08/2026 10 PM PDT 1.77 14 0 Normal
04/08/2026 11 PM PDT 1.77 14 0 Normal
04/09/2026 12 AM PDT 1.77 14 0 Normal
04/09/2026 01 AM PDT 1.77 14 0 Normal
04/09/2026 02 AM PDT 1.78 15 + Normal
04/09/2026 03 AM PDT 1.77 14 - Normal
04/09/2026 04 AM PDT 1.77 14 0 Normal
04/09/2026 05 AM PDT 1.77 14 0 Normal
04/09/2026 06 AM PDT 1.77 14 0 Normal
04/09/2026 07 AM PDT 1.77 14 0 Normal
04/09/2026 08 AM PDT 1.77 14 0 Normal
04/09/2026 09 AM PDT 1.77 14 0 Normal
04/09/2026 10 AM PDT 1.78 15 + Normal
04/09/2026 11 AM PDT 1.78 15 0 Normal
04/09/2026 12 PM PDT 1.77 14 - Normal
04/09/2026 01 PM PDT 1.77 14 0 Normal
04/09/2026 02 PM PDT 1.77 14 0 Normal
04/09/2026 03 PM PDT 1.77 14 0 Normal
04/09/2026 04 PM PDT 1.77 14 0 Normal
04/09/2026 05 PM PDT 1.77 14 0 Normal
04/09/2026 06 PM PDT 1.77 14 0 Normal
04/09/2026 07 PM PDT 1.77 14 0 Normal
04/09/2026 08 PM PDT 1.78 15 + Normal
04/09/2026 09 PM PDT 1.78 15 0 Normal
04/09/2026 10 PM PDT 1.78 15 0 Normal
04/09/2026 11 PM PDT 1.78 15 0 Normal
04/10/2026 12 AM PDT 1.78 15 0 Normal
04/10/2026 01 AM PDT 1.78 15 0 Normal
04/10/2026 02 AM PDT 1.78 15 0 Normal
04/10/2026 03 AM PDT 1.78 15 0 Normal
04/10/2026 04 AM PDT 1.77 14 - Normal
04/10/2026 05 AM PDT 1.78 15 + Normal
04/10/2026 06 AM PDT 1.79 16 + Normal
04/10/2026 07 AM PDT 2.00 39 + Normal
04/10/2026 08 AM PDT 1.96 34 - Normal
04/10/2026 09 AM PDT 1.91 28 - Normal
04/10/2026 10 AM PDT 1.90 27 - Normal
04/10/2026 11 AM PDT 1.90 27 0 Normal
04/10/2026 12 PM PDT 1.90 27 0 Normal
04/10/2026 01 PM PDT 1.94 32 + Normal
04/10/2026 02 PM PDT 2.03 43 + Normal
04/10/2026 03 PM PDT 2.02 41 - Normal
04/10/2026 04 PM PDT 1.99 37 - Normal
04/10/2026 05 PM PDT 1.96 34 - Normal
04/10/2026 06 PM PDT 1.96 34 0 Normal
04/10/2026 07 PM PDT 1.93 31 - Normal
04/10/2026 08 PM PDT 1.93 31 0 Normal
04/10/2026 09 PM PDT 1.95 33 + Normal
04/10/2026 10 PM PDT 1.91 28 - Normal
04/10/2026 11 PM PDT 1.90 27 - Normal
04/11/2026 12 AM PDT 1.90 27 0 Normal
04/11/2026 01 AM PDT 1.91 28 + Normal
04/11/2026 02 AM PDT 1.92 29 + Normal
04/11/2026 03 AM PDT 1.93 31 + Normal
04/11/2026 04 AM PDT 1.91 28 - Normal
04/11/2026 05 AM PDT 1.90 27 - Normal
04/11/2026 06 AM PDT 1.89 26 - Normal
04/11/2026 07 AM PDT 1.88 25 - Normal
04/11/2026 08 AM PDT 1.87 24 - Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
04/11/2026 09 AM PDT 1.87 24 Normal
04/11/2026 10 AM PDT 1.86 23 - Normal
04/11/2026 11 AM PDT 1.86 23 0 Normal
04/11/2026 12 PM PDT 1.86 23 0 Normal
04/11/2026 01 PM PDT 1.86 23 0 Normal
04/11/2026 02 PM PDT 1.86 23 0 Normal
04/11/2026 03 PM PDT 1.86 23 0 Normal
04/11/2026 04 PM PDT 1.87 24 + Normal
04/11/2026 05 PM PDT 1.88 25 + Normal
04/11/2026 06 PM PDT 1.88 25 0 Normal
04/11/2026 07 PM PDT 1.88 25 0 Normal
04/11/2026 08 PM PDT 1.89 26 + Normal
04/11/2026 09 PM PDT 1.89 26 0 Normal
04/11/2026 10 PM PDT 1.90 27 + Normal
04/11/2026 11 PM PDT 1.93 31 + Normal
04/12/2026 12 AM PDT 1.97 35 + Normal
04/12/2026 01 AM PDT 2.01 40 + Normal
04/12/2026 02 AM PDT 2.02 41 + Normal
04/12/2026 03 AM PDT 2.02 41 0 Normal
04/12/2026 04 AM PDT 2.00 39 - Normal
04/12/2026 05 AM PDT 2.01 40 + Normal
04/12/2026 06 AM PDT 2.09 51 + Normal
04/12/2026 07 AM PDT 2.30 82 + Normal
04/12/2026 08 AM PDT 2.60 134 + Normal
04/12/2026 09 AM PDT 2.95 208 + Normal
04/12/2026 10 AM PDT 3.30 294 + Normal
04/12/2026 11 AM PDT 3.71 409 + Normal
04/12/2026 12 PM PDT 3.88 461 + Normal
04/12/2026 01 PM PDT 3.90 467 + Normal
04/12/2026 02 PM PDT 3.84 448 - Normal
04/12/2026 03 PM PDT 3.75 421 - Normal
04/12/2026 04 PM PDT 3.67 397 - Normal
04/12/2026 05 PM PDT 3.62 382 - Normal
04/12/2026 06 PM PDT 3.59 374 - Normal
04/12/2026 07 PM PDT 3.55 362 - Normal
04/12/2026 08 PM PDT 3.50 348 - Normal
04/12/2026 09 PM PDT 3.46 337 - Normal
04/12/2026 10 PM PDT 3.43 329 - Normal
04/12/2026 11 PM PDT 3.37 312 - Normal
04/13/2026 12 AM PDT 3.29 291 - Normal
04/13/2026 01 AM PDT 3.21 271 - Normal
04/13/2026 02 AM PDT 3.13 251 - Normal
04/13/2026 03 AM PDT 3.05 231 - Normal
04/13/2026 04 AM PDT 2.97 213 - Normal
04/13/2026 05 AM PDT 2.89 195 - Normal
04/13/2026 06 AM PDT 2.82 179 - Normal
04/13/2026 07 AM PDT 2.75 164 - Normal
04/13/2026 08 AM PDT 2.68 150 - Normal
04/13/2026 09 AM PDT 2.61 136 - Normal
04/13/2026 10 AM PDT 2.54 123 - Normal
04/13/2026 11 AM PDT 2.48 112 - Normal
04/13/2026 12 PM PDT 2.42 102 - Normal
04/13/2026 01 PM PDT 2.36 92 - Normal
04/13/2026 02 PM PDT 2.31 83 - Normal
04/13/2026 03 PM PDT 2.27 77 - Normal
04/13/2026 04 PM PDT 2.22 70 - Normal
04/13/2026 05 PM PDT 2.18 64 - Normal
04/13/2026 06 PM PDT 2.15 60 - Normal
04/13/2026 07 PM PDT 2.12 55 - Normal
04/13/2026 08 PM PDT 2.09 51 - Normal
04/13/2026 09 PM PDT 2.06 47 - Normal
04/13/2026 10 PM PDT 2.04 44 - Normal
04/13/2026 11 PM PDT 2.02 41 - Normal
04/14/2026 12 AM PDT 2.01 40 - Normal
04/14/2026 01 AM PDT 1.99 37 - Normal
04/14/2026 02 AM PDT 1.98 36 - Normal
04/14/2026 03 AM PDT 1.96 34 - Normal
04/14/2026 04 AM PDT 1.95 33 - Normal
04/14/2026 05 AM PDT 1.94 32 - Normal
04/14/2026 06 AM PDT 1.94 32 0 Normal
04/14/2026 07 AM PDT 1.93 31 - Normal
04/14/2026 08 AM PDT 1.92 29 - Normal
04/14/2026 09 AM PDT 1.92 29 0 Normal
04/14/2026 10 AM PDT 1.91 28 - Normal
04/14/2026 11 AM PDT 1.91 28 0 Normal
04/14/2026 12 PM PDT 1.90 27 - Normal
04/14/2026 01 PM PDT 1.90 27 0 Normal
04/14/2026 02 PM PDT 1.89 26 - Normal
04/14/2026 03 PM PDT 1.89 26 0 Normal
04/14/2026 04 PM PDT 1.89 26 0 Normal
04/14/2026 05 PM PDT 1.89 26 0 Normal
04/14/2026 06 PM PDT 1.89 26 0 Normal
04/14/2026 07 PM PDT 1.88 25 - Normal
04/14/2026 08 PM PDT 1.88 25 0 Normal
04/14/2026 09 PM PDT 1.88 25 0 Normal
04/14/2026 10 PM PDT 1.88 25 0 Normal
04/14/2026 11 PM PDT 1.88 25 0 Normal
04/15/2026 12 AM PDT 1.88 25 0 Normal
04/15/2026 01 AM PDT 1.87 24 - Normal
04/15/2026 02 AM PDT 1.87 24 0 Normal
04/15/2026 03 AM PDT 1.87 24 0 Normal
04/15/2026 04 AM PDT 1.87 24 0 Normal
04/15/2026 05 AM PDT 1.87 24 0 Normal
04/15/2026 06 AM PDT 1.87 24 0 Normal
04/15/2026 07 AM PDT 1.87 24 0 Normal
04/15/2026 08 AM PDT 1.87 24 0 Normal
04/15/2026 09 AM PDT 1.87 24 0 Normal
04/15/2026 10 AM PDT 1.87 24 0 Normal
04/15/2026 11 AM PDT 1.87 24 0 Normal
04/15/2026 12 PM PDT 1.87 24 0 Normal
04/15/2026 01 PM PDT 1.86 23 - Normal
04/15/2026 02 PM PDT 1.86 23 0 Normal
04/15/2026 03 PM PDT 1.86 23 0 Normal
04/15/2026 04 PM PDT 1.86 23 0 Normal
04/15/2026 05 PM PDT 1.86 23 0 Normal
04/15/2026 06 PM PDT 1.86 23 0 Normal
04/15/2026 07 PM PDT 1.86 23 0 Normal
04/15/2026 08 PM PDT 1.86 23 0 Normal
04/15/2026 09 PM PDT 1.86 23 0 Normal
04/15/2026 10 PM PDT 1.86 23 0 Normal
04/15/2026 11 PM PDT 1.86 23 0 Normal
04/16/2026 12 AM PDT 1.86 23 0 Normal
04/16/2026 01 AM PDT 1.86 23 0 Normal
04/16/2026 02 AM PDT 1.86 23 0 Normal
04/16/2026 03 AM PDT 1.86 23 0 Normal
04/16/2026 04 AM PDT 1.86 23 0 Normal
04/16/2026 05 AM PDT 1.86 23 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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