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RUSSIAN RIVER - HACIENDA BRIDGE (RIOC1)
| Latitude: 38.51º N | Longitude: 122.93º W | Elevation: 20 Feet | | Forecast Type: Unofficial Location |
| Location: Sonoma County in California | Bulletin Group: Russian Napa | River Group: Russian Napa |
| Issuance Time: | Aug 18 2026 at 7:08 AM PDT | Next Issuance: | Aug 19 2026 at 9:00 AM PDT
| |
| Action/Monitor: 31.0 Feet | Minor Flood: 34.0 Feet | Moderate Flood: N/A | Major Flood: N/A |
# Tabular Observed and Forecast Hydrograph Information
#
# Location: Russian River - Hacienda Bridge (RIOC1)
#
# File Generation Time: 08/18/2026 at 07:09 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 08/17/2026 at 03:00 PM PDT
# Maximum Observed Stage: 1.27 Feet
# Maximum Observed Flow: 122 cfs
#
# Earliest Date & Time of Maximum Forecast: 08/18/2026 at 08:00 AM PDT
# Maximum Forecast Stage: 1.20 Feet
# Maximum Forecast Flow: 114 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
08/13/2026 07 AM PDT 1.24 118 Normal
08/13/2026 08 AM PDT 1.24 118 0 Normal
08/13/2026 09 AM PDT 1.24 118 0 Normal
08/13/2026 10 AM PDT 1.24 118 0 Normal
08/13/2026 11 AM PDT 1.24 118 0 Normal
08/13/2026 12 PM PDT 1.24 118 0 Normal
08/13/2026 01 PM PDT 1.24 118 0 Normal
08/13/2026 02 PM PDT 1.24 118 0 Normal
08/13/2026 03 PM PDT 1.24 118 0 Normal
08/13/2026 04 PM PDT 1.24 118 0 Normal
08/13/2026 05 PM PDT 1.24 118 0 Normal
08/13/2026 06 PM PDT 1.23 117 - Normal
08/13/2026 07 PM PDT 1.23 117 0 Normal
08/13/2026 08 PM PDT 1.23 117 0 Normal
08/13/2026 09 PM PDT 1.23 117 0 Normal
08/13/2026 10 PM PDT 1.23 117 0 Normal
08/13/2026 11 PM PDT 1.23 117 0 Normal
08/14/2026 12 AM PDT 1.23 117 0 Normal
08/14/2026 01 AM PDT 1.23 117 0 Normal
08/14/2026 02 AM PDT 1.23 117 0 Normal
08/14/2026 03 AM PDT 1.23 117 0 Normal
08/14/2026 04 AM PDT 1.23 117 0 Normal
08/14/2026 05 AM PDT 1.22 116 - Normal
08/14/2026 06 AM PDT 1.22 116 0 Normal
08/14/2026 07 AM PDT 1.22 116 0 Normal
08/14/2026 08 AM PDT 1.22 116 0 Normal
08/14/2026 09 AM PDT 1.22 116 0 Normal
08/14/2026 10 AM PDT 1.22 116 0 Normal
08/14/2026 11 AM PDT 1.22 116 0 Normal
08/14/2026 12 PM PDT 1.22 116 0 Normal
08/14/2026 01 PM PDT 1.22 116 0 Normal
08/14/2026 02 PM PDT 1.22 116 0 Normal
08/14/2026 03 PM PDT 1.22 116 0 Normal
08/14/2026 04 PM PDT 1.21 115 - Normal
08/14/2026 05 PM PDT 1.21 115 0 Normal
08/14/2026 06 PM PDT 1.21 115 0 Normal
08/14/2026 07 PM PDT 1.21 115 0 Normal
08/14/2026 08 PM PDT 1.21 115 0 Normal
08/14/2026 09 PM PDT 1.22 116 + Normal
08/14/2026 10 PM PDT 1.22 116 0 Normal
08/14/2026 11 PM PDT 1.22 116 0 Normal
08/15/2026 12 AM PDT 1.23 117 + Normal
08/15/2026 01 AM PDT 1.23 117 0 Normal
08/15/2026 02 AM PDT 1.23 117 0 Normal
08/15/2026 03 AM PDT 1.23 117 0 Normal
08/15/2026 04 AM PDT 1.23 117 0 Normal
08/15/2026 05 AM PDT 1.23 117 0 Normal
08/15/2026 06 AM PDT 1.23 117 0 Normal
08/15/2026 07 AM PDT 1.23 117 0 Normal
08/15/2026 08 AM PDT 1.23 117 0 Normal
08/15/2026 09 AM PDT 1.23 117 0 Normal
08/15/2026 10 AM PDT 1.23 117 0 Normal
08/15/2026 11 AM PDT 1.23 117 0 Normal
08/15/2026 12 PM PDT 1.23 117 0 Normal
08/15/2026 01 PM PDT 1.23 117 0 Normal
08/15/2026 02 PM PDT 1.23 117 0 Normal
08/15/2026 03 PM PDT 1.23 117 0 Normal
08/15/2026 04 PM PDT 1.24 118 + Normal
08/15/2026 05 PM PDT 1.23 117 - Normal
08/15/2026 06 PM PDT 1.23 117 0 Normal
08/15/2026 07 PM PDT 1.22 116 - Normal
08/15/2026 08 PM PDT 1.22 116 0 Normal
08/15/2026 09 PM PDT 1.23 117 + Normal
08/15/2026 10 PM PDT 1.22 116 - Normal
08/15/2026 11 PM PDT 1.22 116 0 Normal
08/16/2026 12 AM PDT 1.22 116 0 Normal
08/16/2026 01 AM PDT 1.22 116 0 Normal
08/16/2026 02 AM PDT 1.22 116 0 Normal
08/16/2026 03 AM PDT 1.22 116 0 Normal
08/16/2026 04 AM PDT 1.22 116 0 Normal
08/16/2026 05 AM PDT 1.22 116 0 Normal
08/16/2026 06 AM PDT 1.23 117 + Normal
08/16/2026 07 AM PDT 1.23 117 0 Normal
08/16/2026 08 AM PDT 1.23 117 0 Normal
08/16/2026 09 AM PDT 1.23 117 0 Normal
08/16/2026 10 AM PDT 1.24 118 + Normal
08/16/2026 11 AM PDT 1.24 118 0 Normal
08/16/2026 12 PM PDT 1.24 118 0 Normal
08/16/2026 01 PM PDT 1.24 118 0 Normal
08/16/2026 02 PM PDT 1.24 118 0 Normal
08/16/2026 03 PM PDT 1.25 119 + Normal
08/16/2026 04 PM PDT 1.25 119 0 Normal
08/16/2026 05 PM PDT 1.24 118 - Normal
08/16/2026 06 PM PDT 1.24 118 0 Normal
08/16/2026 07 PM PDT 1.24 118 0 Normal
08/16/2026 08 PM PDT 1.25 119 + Normal
08/16/2026 09 PM PDT 1.25 119 0 Normal
08/16/2026 10 PM PDT 1.25 119 0 Normal
08/16/2026 11 PM PDT 1.25 119 0 Normal
08/17/2026 12 AM PDT 1.25 119 0 Normal
08/17/2026 01 AM PDT 1.25 119 0 Normal
08/17/2026 02 AM PDT 1.25 119 0 Normal
08/17/2026 03 AM PDT 1.25 119 0 Normal
08/17/2026 04 AM PDT 1.25 119 0 Normal
08/17/2026 05 AM PDT 1.25 119 0 Normal
08/17/2026 06 AM PDT 1.26 121 + Normal
08/17/2026 07 AM PDT 1.26 121 0 Normal
08/17/2026 08 AM PDT 1.26 121 0 Normal
08/17/2026 09 AM PDT 1.27 122 + Normal
08/17/2026 10 AM PDT 1.27 122 0 Normal
08/17/2026 11 AM PDT 1.27 122 0 Normal
08/17/2026 12 PM PDT 1.27 122 0 Normal
08/17/2026 01 PM PDT 1.27 122 0 Normal
08/17/2026 02 PM PDT 1.27 122 0 Normal
08/17/2026 03 PM PDT 1.27 122 0 Normal
08/17/2026 04 PM PDT 1.26 121 - Normal
08/17/2026 05 PM PDT 1.25 119 - Normal
08/17/2026 06 PM PDT 1.25 119 0 Normal
08/17/2026 07 PM PDT 1.25 119 0 Normal
08/17/2026 08 PM PDT 1.25 119 0 Normal
08/17/2026 09 PM PDT 1.25 119 0 Normal
08/17/2026 10 PM PDT 1.24 118 - Normal
08/17/2026 11 PM PDT 1.24 118 0 Normal
08/18/2026 12 AM PDT 1.24 118 0 Normal
08/18/2026 01 AM PDT 1.24 118 0 Normal
08/18/2026 02 AM PDT 1.23 117 - Normal
08/18/2026 03 AM PDT 1.23 117 0 Normal
08/18/2026 04 AM PDT 1.22 116 - Normal
08/18/2026 05 AM PDT 1.22 116 0 Normal
08/18/2026 06 AM PDT 1.21 115 - Normal
08/18/2026 07 AM PDT 1.21 115 0 Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
08/18/2026 08 AM PDT 1.20 114 Normal
08/18/2026 09 AM PDT 1.19 113 - Normal
08/18/2026 10 AM PDT 1.19 113 0 Normal
08/18/2026 11 AM PDT 1.18 112 - Normal
08/18/2026 12 PM PDT 1.18 112 0 Normal
08/18/2026 01 PM PDT 1.17 111 - Normal
08/18/2026 02 PM PDT 1.17 111 0 Normal
08/18/2026 03 PM PDT 1.16 110 - Normal
08/18/2026 04 PM PDT 1.16 110 0 Normal
08/18/2026 05 PM PDT 1.15 109 - Normal
08/18/2026 06 PM PDT 1.15 109 0 Normal
08/18/2026 07 PM PDT 1.15 109 0 Normal
08/18/2026 08 PM PDT 1.15 109 0 Normal
08/18/2026 09 PM PDT 1.15 109 0 Normal
08/18/2026 10 PM PDT 1.15 109 0 Normal
08/18/2026 11 PM PDT 1.15 109 0 Normal
08/19/2026 12 AM PDT 1.15 109 0 Normal
08/19/2026 01 AM PDT 1.15 109 0 Normal
08/19/2026 02 AM PDT 1.15 109 0 Normal
08/19/2026 03 AM PDT 1.15 109 0 Normal
08/19/2026 04 AM PDT 1.16 110 + Normal
08/19/2026 05 AM PDT 1.16 110 0 Normal
08/19/2026 06 AM PDT 1.16 110 0 Normal
08/19/2026 07 AM PDT 1.15 109 - Normal
08/19/2026 08 AM PDT 1.15 109 0 Normal
08/19/2026 09 AM PDT 1.15 109 0 Normal
08/19/2026 10 AM PDT 1.14 108 - Normal
08/19/2026 11 AM PDT 1.14 108 0 Normal
08/19/2026 12 PM PDT 1.13 107 - Normal
08/19/2026 01 PM PDT 1.12 106 - Normal
08/19/2026 02 PM PDT 1.12 106 0 Normal
08/19/2026 03 PM PDT 1.11 105 - Normal
08/19/2026 04 PM PDT 1.10 104 - Normal
08/19/2026 05 PM PDT 1.10 104 0 Normal
08/19/2026 06 PM PDT 1.09 103 - Normal
08/19/2026 07 PM PDT 1.09 103 0 Normal
08/19/2026 08 PM PDT 1.08 102 - Normal
08/19/2026 09 PM PDT 1.08 102 0 Normal
08/19/2026 10 PM PDT 1.08 102 0 Normal
08/19/2026 11 PM PDT 1.07 101 - Normal
08/20/2026 12 AM PDT 1.07 101 0 Normal
08/20/2026 01 AM PDT 1.07 101 0 Normal
08/20/2026 02 AM PDT 1.06 100 - Normal
08/20/2026 03 AM PDT 1.06 100 0 Normal
08/20/2026 04 AM PDT 1.06 100 0 Normal
08/20/2026 05 AM PDT 1.06 100 0 Normal
08/20/2026 06 AM PDT 1.06 100 0 Normal
08/20/2026 07 AM PDT 1.05 99 - Normal
08/20/2026 08 AM PDT 1.05 99 0 Normal
08/20/2026 09 AM PDT 1.05 99 0 Normal
08/20/2026 10 AM PDT 1.05 99 0 Normal
08/20/2026 11 AM PDT 1.05 99 0 Normal
08/20/2026 12 PM PDT 1.05 99 0 Normal
08/20/2026 01 PM PDT 1.05 99 0 Normal
08/20/2026 02 PM PDT 1.05 99 0 Normal
08/20/2026 03 PM PDT 1.05 99 0 Normal
08/20/2026 04 PM PDT 1.05 99 0 Normal
08/20/2026 05 PM PDT 1.05 99 0 Normal
08/20/2026 06 PM PDT 1.05 99 0 Normal
08/20/2026 07 PM PDT 1.05 99 0 Normal
08/20/2026 08 PM PDT 1.05 99 0 Normal
08/20/2026 09 PM PDT 1.05 99 0 Normal
08/20/2026 10 PM PDT 1.05 99 0 Normal
08/20/2026 11 PM PDT 1.05 99 0 Normal
08/21/2026 12 AM PDT 1.05 99 0 Normal
08/21/2026 01 AM PDT 1.04 98 - Normal
08/21/2026 02 AM PDT 1.04 98 0 Normal
08/21/2026 03 AM PDT 1.04 98 0 Normal
08/21/2026 04 AM PDT 1.04 98 0 Normal
08/21/2026 05 AM PDT 1.05 99 + Normal
08/21/2026 06 AM PDT 1.05 99 0 Normal
08/21/2026 07 AM PDT 1.05 99 0 Normal
08/21/2026 08 AM PDT 1.05 99 0 Normal
08/21/2026 09 AM PDT 1.05 99 0 Normal
08/21/2026 10 AM PDT 1.05 99 0 Normal
08/21/2026 11 AM PDT 1.05 99 0 Normal
08/21/2026 12 PM PDT 1.05 99 0 Normal
08/21/2026 01 PM PDT 1.05 99 0 Normal
08/21/2026 02 PM PDT 1.05 99 0 Normal
08/21/2026 03 PM PDT 1.05 99 0 Normal
08/21/2026 04 PM PDT 1.05 99 0 Normal
08/21/2026 05 PM PDT 1.05 99 0 Normal
08/21/2026 06 PM PDT 1.05 99 0 Normal
08/21/2026 07 PM PDT 1.05 99 0 Normal
08/21/2026 08 PM PDT 1.05 99 0 Normal
08/21/2026 09 PM PDT 1.05 99 0 Normal
08/21/2026 10 PM PDT 1.05 99 0 Normal
08/21/2026 11 PM PDT 1.05 99 0 Normal
08/22/2026 12 AM PDT 1.05 99 0 Normal
08/22/2026 01 AM PDT 1.05 99 0 Normal
08/22/2026 02 AM PDT 1.05 99 0 Normal
08/22/2026 03 AM PDT 1.05 99 0 Normal
08/22/2026 04 AM PDT 1.05 99 0 Normal
08/22/2026 05 AM PDT 1.05 99 0 Normal
08/22/2026 06 AM PDT 1.05 99 0 Normal
08/22/2026 07 AM PDT 1.05 99 0 Normal
08/22/2026 08 AM PDT 1.05 99 0 Normal
08/22/2026 09 AM PDT 1.05 99 0 Normal
08/22/2026 10 AM PDT 1.05 99 0 Normal
08/22/2026 11 AM PDT 1.05 99 0 Normal
08/22/2026 12 PM PDT 1.05 99 0 Normal
08/22/2026 01 PM PDT 1.05 99 0 Normal
08/22/2026 02 PM PDT 1.05 99 0 Normal
08/22/2026 03 PM PDT 1.05 99 0 Normal
08/22/2026 04 PM PDT 1.05 99 0 Normal
08/22/2026 05 PM PDT 1.05 99 0 Normal
08/22/2026 06 PM PDT 1.05 99 0 Normal
08/22/2026 07 PM PDT 1.05 99 0 Normal
08/22/2026 08 PM PDT 1.05 99 0 Normal
08/22/2026 09 PM PDT 1.05 99 0 Normal
08/22/2026 10 PM PDT 1.05 99 0 Normal
08/22/2026 11 PM PDT 1.05 99 0 Normal
08/23/2026 12 AM PDT 1.05 99 0 Normal
08/23/2026 01 AM PDT 1.05 99 0 Normal
08/23/2026 02 AM PDT 1.05 99 0 Normal
08/23/2026 03 AM PDT 1.05 99 0 Normal
08/23/2026 04 AM PDT 1.05 99 0 Normal
08/23/2026 05 AM PDT 1.05 99 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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