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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: | May 17 2026 at 7:38 AM PDT | Next Issuance: | May 18 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: 05/17/2026 at 07:38 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 05/12/2026 at 05:00 PM PDT
# Maximum Observed Stage: 1.79 Feet
# Maximum Observed Flow: 16 cfs
#
# Earliest Date & Time of Maximum Forecast: 05/17/2026 at 08:00 AM PDT
# Maximum Forecast Stage: 1.72 Feet
# Maximum Forecast Flow: 11 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
05/12/2026 07 AM PDT 1.78 15 Normal
05/12/2026 08 AM PDT 1.79 16 + Normal
05/12/2026 09 AM PDT 1.79 16 0 Normal
05/12/2026 10 AM PDT 1.79 16 0 Normal
05/12/2026 11 AM PDT 1.79 16 0 Normal
05/12/2026 12 PM PDT 1.79 16 0 Normal
05/12/2026 01 PM PDT 1.79 16 0 Normal
05/12/2026 02 PM PDT 1.79 16 0 Normal
05/12/2026 03 PM PDT 1.79 16 0 Normal
05/12/2026 04 PM PDT 1.79 16 0 Normal
05/12/2026 05 PM PDT 1.79 16 0 Normal
05/12/2026 06 PM PDT 1.78 15 - Normal
05/12/2026 07 PM PDT 1.78 15 0 Normal
05/12/2026 08 PM PDT 1.78 15 0 Normal
05/12/2026 09 PM PDT 1.78 15 0 Normal
05/12/2026 10 PM PDT 1.77 14 - Normal
05/12/2026 11 PM PDT 1.77 14 0 Normal
05/13/2026 12 AM PDT 1.76 14 - Normal
05/13/2026 01 AM PDT 1.76 14 0 Normal
05/13/2026 02 AM PDT 1.76 14 0 Normal
05/13/2026 03 AM PDT 1.77 14 + Normal
05/13/2026 04 AM PDT 1.77 14 0 Normal
05/13/2026 05 AM PDT 1.77 14 0 Normal
05/13/2026 06 AM PDT 1.77 14 0 Normal
05/13/2026 07 AM PDT 1.78 15 + Normal
05/13/2026 08 AM PDT 1.78 15 0 Normal
05/13/2026 09 AM PDT 1.78 15 0 Normal
05/13/2026 10 AM PDT 1.78 15 0 Normal
05/13/2026 11 AM PDT 1.78 15 0 Normal
05/13/2026 12 PM PDT 1.78 15 0 Normal
05/13/2026 01 PM PDT 1.78 15 0 Normal
05/13/2026 02 PM PDT 1.77 14 - Normal
05/13/2026 03 PM PDT 1.77 14 0 Normal
05/13/2026 04 PM PDT 1.77 14 0 Normal
05/13/2026 05 PM PDT 1.77 14 0 Normal
05/13/2026 06 PM PDT 1.77 14 0 Normal
05/13/2026 07 PM PDT 1.77 14 0 Normal
05/13/2026 08 PM PDT 1.76 14 - Normal
05/13/2026 09 PM PDT 1.76 14 0 Normal
05/13/2026 10 PM PDT 1.75 13 - Normal
05/13/2026 11 PM PDT 1.75 13 0 Normal
05/14/2026 12 AM PDT 1.75 13 0 Normal
05/14/2026 01 AM PDT 1.74 12 - Normal
05/14/2026 02 AM PDT 1.75 13 + Normal
05/14/2026 03 AM PDT 1.75 13 0 Normal
05/14/2026 04 AM PDT 1.76 14 + Normal
05/14/2026 05 AM PDT 1.76 14 0 Normal
05/14/2026 06 AM PDT 1.76 14 0 Normal
05/14/2026 07 AM PDT 1.76 14 0 Normal
05/14/2026 08 AM PDT 1.76 14 0 Normal
05/14/2026 09 AM PDT 1.76 14 0 Normal
05/14/2026 10 AM PDT 1.76 14 0 Normal
05/14/2026 11 AM PDT 1.76 14 0 Normal
05/14/2026 12 PM PDT 1.76 14 0 Normal
05/14/2026 01 PM PDT 1.76 14 0 Normal
05/14/2026 02 PM PDT 1.76 14 0 Normal
05/14/2026 03 PM PDT 1.76 14 0 Normal
05/14/2026 04 PM PDT 1.76 14 0 Normal
05/14/2026 05 PM PDT 1.76 14 0 Normal
05/14/2026 06 PM PDT 1.76 14 0 Normal
05/14/2026 07 PM PDT 1.76 14 0 Normal
05/14/2026 08 PM PDT 1.76 14 0 Normal
05/14/2026 09 PM PDT 1.75 13 - Normal
05/14/2026 10 PM PDT 1.75 13 0 Normal
05/14/2026 11 PM PDT 1.75 13 0 Normal
05/15/2026 12 AM PDT 1.75 13 0 Normal
05/15/2026 01 AM PDT 1.74 12 - Normal
05/15/2026 02 AM PDT 1.75 13 + Normal
05/15/2026 03 AM PDT 1.75 13 0 Normal
05/15/2026 04 AM PDT 1.75 13 0 Normal
05/15/2026 05 AM PDT 1.76 14 + Normal
05/15/2026 06 AM PDT 1.76 14 0 Normal
05/15/2026 07 AM PDT 1.75 13 - Normal
05/15/2026 08 AM PDT 1.75 13 0 Normal
05/15/2026 09 AM PDT 1.75 13 0 Normal
05/15/2026 10 AM PDT 1.76 14 + Normal
05/15/2026 11 AM PDT 1.75 13 - Normal
05/15/2026 12 PM PDT 1.75 13 0 Normal
05/15/2026 01 PM PDT 1.75 13 0 Normal
05/15/2026 02 PM PDT 1.75 13 0 Normal
05/15/2026 03 PM PDT 1.75 13 0 Normal
05/15/2026 04 PM PDT 1.75 13 0 Normal
05/15/2026 05 PM PDT 1.74 12 - Normal
05/15/2026 06 PM PDT 1.74 12 0 Normal
05/15/2026 07 PM PDT 1.74 12 0 Normal
05/15/2026 08 PM PDT 1.74 12 0 Normal
05/15/2026 09 PM PDT 1.74 12 0 Normal
05/15/2026 10 PM PDT 1.73 11 - Normal
05/15/2026 11 PM PDT 1.73 11 0 Normal
05/16/2026 12 AM PDT 1.72 11 - Normal
05/16/2026 01 AM PDT 1.72 11 0 Normal
05/16/2026 02 AM PDT 1.72 11 0 Normal
05/16/2026 03 AM PDT 1.72 11 0 Normal
05/16/2026 04 AM PDT 1.72 11 0 Normal
05/16/2026 05 AM PDT 1.73 11 + Normal
05/16/2026 06 AM PDT 1.73 11 0 Normal
05/16/2026 07 AM PDT 1.73 11 0 Normal
05/16/2026 08 AM PDT 1.73 11 0 Normal
05/16/2026 09 AM PDT 1.73 11 0 Normal
05/16/2026 10 AM PDT 1.73 11 0 Normal
05/16/2026 11 AM PDT 1.73 11 0 Normal
05/16/2026 12 PM PDT 1.73 11 0 Normal
05/16/2026 01 PM PDT 1.73 11 0 Normal
05/16/2026 02 PM PDT 1.73 11 0 Normal
05/16/2026 03 PM PDT 1.73 11 0 Normal
05/16/2026 04 PM PDT 1.73 11 0 Normal
05/16/2026 05 PM PDT 1.73 11 0 Normal
05/16/2026 06 PM PDT 1.73 11 0 Normal
05/16/2026 07 PM PDT 1.73 11 0 Normal
05/16/2026 08 PM PDT 1.73 11 0 Normal
05/16/2026 09 PM PDT 1.73 11 0 Normal
05/16/2026 10 PM PDT 1.72 11 - Normal
05/16/2026 11 PM PDT 1.72 11 0 Normal
05/17/2026 12 AM PDT 1.72 11 0 Normal
05/17/2026 01 AM PDT 1.72 11 0 Normal
05/17/2026 02 AM PDT 1.72 11 0 Normal
05/17/2026 03 AM PDT 1.71 10 - Normal
05/17/2026 04 AM PDT 1.72 11 + Normal
05/17/2026 05 AM PDT 1.72 11 0 Normal
05/17/2026 06 AM PDT 1.72 11 0 Normal
05/17/2026 07 AM PDT 1.72 11 0 Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
05/17/2026 08 AM PDT 1.72 11 Normal
05/17/2026 09 AM PDT 1.72 11 0 Normal
05/17/2026 10 AM PDT 1.72 11 0 Normal
05/17/2026 11 AM PDT 1.72 11 0 Normal
05/17/2026 12 PM PDT 1.72 11 0 Normal
05/17/2026 01 PM PDT 1.72 11 0 Normal
05/17/2026 02 PM PDT 1.72 11 0 Normal
05/17/2026 03 PM PDT 1.72 11 0 Normal
05/17/2026 04 PM PDT 1.72 11 0 Normal
05/17/2026 05 PM PDT 1.72 11 0 Normal
05/17/2026 06 PM PDT 1.72 11 0 Normal
05/17/2026 07 PM PDT 1.72 11 0 Normal
05/17/2026 08 PM PDT 1.72 11 0 Normal
05/17/2026 09 PM PDT 1.72 11 0 Normal
05/17/2026 10 PM PDT 1.72 11 0 Normal
05/17/2026 11 PM PDT 1.72 11 0 Normal
05/18/2026 12 AM PDT 1.72 11 0 Normal
05/18/2026 01 AM PDT 1.72 11 0 Normal
05/18/2026 02 AM PDT 1.72 11 0 Normal
05/18/2026 03 AM PDT 1.72 11 0 Normal
05/18/2026 04 AM PDT 1.72 11 0 Normal
05/18/2026 05 AM PDT 1.71 10 - Normal
05/18/2026 06 AM PDT 1.71 10 0 Normal
05/18/2026 07 AM PDT 1.71 10 0 Normal
05/18/2026 08 AM PDT 1.71 10 0 Normal
05/18/2026 09 AM PDT 1.71 10 0 Normal
05/18/2026 10 AM PDT 1.71 10 0 Normal
05/18/2026 11 AM PDT 1.71 10 0 Normal
05/18/2026 12 PM PDT 1.71 10 0 Normal
05/18/2026 01 PM PDT 1.71 10 0 Normal
05/18/2026 02 PM PDT 1.71 10 0 Normal
05/18/2026 03 PM PDT 1.71 10 0 Normal
05/18/2026 04 PM PDT 1.71 10 0 Normal
05/18/2026 05 PM PDT 1.71 10 0 Normal
05/18/2026 06 PM PDT 1.71 10 0 Normal
05/18/2026 07 PM PDT 1.71 10 0 Normal
05/18/2026 08 PM PDT 1.71 10 0 Normal
05/18/2026 09 PM PDT 1.71 10 0 Normal
05/18/2026 10 PM PDT 1.71 10 0 Normal
05/18/2026 11 PM PDT 1.71 10 0 Normal
05/19/2026 12 AM PDT 1.71 10 0 Normal
05/19/2026 01 AM PDT 1.71 10 0 Normal
05/19/2026 02 AM PDT 1.71 10 0 Normal
05/19/2026 03 AM PDT 1.71 10 0 Normal
05/19/2026 04 AM PDT 1.71 10 0 Normal
05/19/2026 05 AM PDT 1.71 10 0 Normal
05/19/2026 06 AM PDT 1.71 10 0 Normal
05/19/2026 07 AM PDT 1.71 10 0 Normal
05/19/2026 08 AM PDT 1.71 10 0 Normal
05/19/2026 09 AM PDT 1.71 10 0 Normal
05/19/2026 10 AM PDT 1.71 10 0 Normal
05/19/2026 11 AM PDT 1.71 10 0 Normal
05/19/2026 12 PM PDT 1.71 10 0 Normal
05/19/2026 01 PM PDT 1.71 10 0 Normal
05/19/2026 02 PM PDT 1.71 10 0 Normal
05/19/2026 03 PM PDT 1.71 10 0 Normal
05/19/2026 04 PM PDT 1.71 10 0 Normal
05/19/2026 05 PM PDT 1.71 10 0 Normal
05/19/2026 06 PM PDT 1.71 10 0 Normal
05/19/2026 07 PM PDT 1.71 10 0 Normal
05/19/2026 08 PM PDT 1.71 10 0 Normal
05/19/2026 09 PM PDT 1.71 10 0 Normal
05/19/2026 10 PM PDT 1.71 10 0 Normal
05/19/2026 11 PM PDT 1.71 10 0 Normal
05/20/2026 12 AM PDT 1.70 9 - Normal
05/20/2026 01 AM PDT 1.70 9 0 Normal
05/20/2026 02 AM PDT 1.70 9 0 Normal
05/20/2026 03 AM PDT 1.70 9 0 Normal
05/20/2026 04 AM PDT 1.70 9 0 Normal
05/20/2026 05 AM PDT 1.70 9 0 Normal
05/20/2026 06 AM PDT 1.70 9 0 Normal
05/20/2026 07 AM PDT 1.70 9 0 Normal
05/20/2026 08 AM PDT 1.70 9 0 Normal
05/20/2026 09 AM PDT 1.70 9 0 Normal
05/20/2026 10 AM PDT 1.70 9 0 Normal
05/20/2026 11 AM PDT 1.70 9 0 Normal
05/20/2026 12 PM PDT 1.70 9 0 Normal
05/20/2026 01 PM PDT 1.70 9 0 Normal
05/20/2026 02 PM PDT 1.70 9 0 Normal
05/20/2026 03 PM PDT 1.70 9 0 Normal
05/20/2026 04 PM PDT 1.70 9 0 Normal
05/20/2026 05 PM PDT 1.70 9 0 Normal
05/20/2026 06 PM PDT 1.70 9 0 Normal
05/20/2026 07 PM PDT 1.70 9 0 Normal
05/20/2026 08 PM PDT 1.70 9 0 Normal
05/20/2026 09 PM PDT 1.70 9 0 Normal
05/20/2026 10 PM PDT 1.70 9 0 Normal
05/20/2026 11 PM PDT 1.70 9 0 Normal
05/21/2026 12 AM PDT 1.70 9 0 Normal
05/21/2026 01 AM PDT 1.70 9 0 Normal
05/21/2026 02 AM PDT 1.70 9 0 Normal
05/21/2026 03 AM PDT 1.70 9 0 Normal
05/21/2026 04 AM PDT 1.70 9 0 Normal
05/21/2026 05 AM PDT 1.70 9 0 Normal
05/21/2026 06 AM PDT 1.70 9 0 Normal
05/21/2026 07 AM PDT 1.70 9 0 Normal
05/21/2026 08 AM PDT 1.70 9 0 Normal
05/21/2026 09 AM PDT 1.70 9 0 Normal
05/21/2026 10 AM PDT 1.70 9 0 Normal
05/21/2026 11 AM PDT 1.70 9 0 Normal
05/21/2026 12 PM PDT 1.70 9 0 Normal
05/21/2026 01 PM PDT 1.70 9 0 Normal
05/21/2026 02 PM PDT 1.70 9 0 Normal
05/21/2026 03 PM PDT 1.70 9 0 Normal
05/21/2026 04 PM PDT 1.70 9 0 Normal
05/21/2026 05 PM PDT 1.70 9 0 Normal
05/21/2026 06 PM PDT 1.70 9 0 Normal
05/21/2026 07 PM PDT 1.69 9 - Normal
05/21/2026 08 PM PDT 1.69 9 0 Normal
05/21/2026 09 PM PDT 1.69 9 0 Normal
05/21/2026 10 PM PDT 1.69 9 0 Normal
05/21/2026 11 PM PDT 1.69 9 0 Normal
05/22/2026 12 AM PDT 1.69 9 0 Normal
05/22/2026 01 AM PDT 1.69 9 0 Normal
05/22/2026 02 AM PDT 1.69 9 0 Normal
05/22/2026 03 AM PDT 1.69 9 0 Normal
05/22/2026 04 AM PDT 1.69 9 0 Normal
05/22/2026 05 AM PDT 1.69 9 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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