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SAN JOAQUIN RIVER - PATTERSON (PATC1)
| Latitude: 37.49º N | Longitude: 121.08º W | Elevation: 97 Feet | | Forecast Type: Official Location |
| Location: Stanislaus County in California | Bulletin Group: San Joaquin | River Group: San Joaquin |
| Issuance Time: | May 09 2026 at 7:47 AM PDT | Next Issuance: | May 10 2026 at 9:00 AM PDT
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| Action/Monitor: 48.0 Feet | Minor Flood: 54.7 Feet | Moderate Flood: 57.3 Feet | Major Flood: 58.3 Feet |
# Tabular Observed and Forecast Hydrograph Information
#
# Location: San Joaquin River - Patterson (PATC1)
#
# File Generation Time: 05/09/2026 at 07:47 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 05/04/2026 at 08:00 AM PDT
# Maximum Observed Stage: 32.32 Feet
# Maximum Observed Flow: 721 cfs
#
# Earliest Date & Time of Maximum Forecast: 05/09/2026 at 08:00 AM PDT
# Maximum Forecast Stage: 31.97 Feet
# Maximum Forecast Flow: 613 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
05/04/2026 07 AM PDT 32.32 721 Normal
05/04/2026 08 AM PDT 32.32 721 0 Normal
05/04/2026 09 AM PDT 32.31 718 - Normal
05/04/2026 10 AM PDT 32.31 718 0 Normal
05/04/2026 11 AM PDT 32.30 715 - Normal
05/04/2026 12 PM PDT 32.30 715 0 Normal
05/04/2026 01 PM PDT 32.30 715 0 Normal
05/04/2026 02 PM PDT 32.30 715 0 Normal
05/04/2026 03 PM PDT 32.30 715 0 Normal
05/04/2026 04 PM PDT 32.30 715 0 Normal
05/04/2026 05 PM PDT 32.29 711 - Normal
05/04/2026 06 PM PDT 32.30 715 + Normal
05/04/2026 07 PM PDT 32.29 711 - Normal
05/04/2026 08 PM PDT 32.29 711 0 Normal
05/04/2026 09 PM PDT 32.29 711 0 Normal
05/04/2026 10 PM PDT 32.28 708 - Normal
05/04/2026 11 PM PDT 32.28 708 0 Normal
05/05/2026 12 AM PDT 32.28 708 0 Normal
05/05/2026 01 AM PDT 32.28 708 0 Normal
05/05/2026 02 AM PDT 32.28 708 0 Normal
05/05/2026 03 AM PDT 32.27 705 - Normal
05/05/2026 04 AM PDT 32.26 701 - Normal
05/05/2026 05 AM PDT 32.26 701 0 Normal
05/05/2026 06 AM PDT 32.26 701 0 Normal
05/05/2026 07 AM PDT 32.26 701 0 Normal
05/05/2026 08 AM PDT 32.26 701 0 Normal
05/05/2026 09 AM PDT 32.25 698 - Normal
05/05/2026 10 AM PDT 32.25 698 0 Normal
05/05/2026 11 AM PDT 32.25 698 0 Normal
05/05/2026 12 PM PDT 32.24 695 - Normal
05/05/2026 01 PM PDT 32.24 695 0 Normal
05/05/2026 02 PM PDT 32.24 695 0 Normal
05/05/2026 03 PM PDT 32.23 691 - Normal
05/05/2026 04 PM PDT 32.23 691 0 Normal
05/05/2026 05 PM PDT 32.23 691 0 Normal
05/05/2026 06 PM PDT 32.22 688 - Normal
05/05/2026 07 PM PDT 32.22 688 0 Normal
05/05/2026 08 PM PDT 32.21 685 - Normal
05/05/2026 09 PM PDT 32.21 685 0 Normal
05/05/2026 10 PM PDT 32.21 685 0 Normal
05/05/2026 11 PM PDT 32.21 685 0 Normal
05/06/2026 12 AM PDT 32.20 682 - Normal
05/06/2026 01 AM PDT 32.20 682 0 Normal
05/06/2026 02 AM PDT 32.20 682 0 Normal
05/06/2026 03 AM PDT 32.20 682 0 Normal
05/06/2026 04 AM PDT 32.20 682 0 Normal
05/06/2026 05 AM PDT 32.19 678 - Normal
05/06/2026 06 AM PDT 32.19 678 0 Normal
05/06/2026 07 AM PDT 32.19 678 0 Normal
05/06/2026 08 AM PDT 32.18 675 - Normal
05/06/2026 09 AM PDT 32.17 672 - Normal
05/06/2026 10 AM PDT 32.17 672 0 Normal
05/06/2026 11 AM PDT 32.14 663 - Normal
05/06/2026 12 PM PDT 32.12 657 - Normal
05/06/2026 01 PM PDT 32.12 657 0 Normal
05/06/2026 02 PM PDT 32.14 663 + Normal
05/06/2026 03 PM PDT 32.14 663 0 Normal
05/06/2026 04 PM PDT 32.13 660 - Normal
05/06/2026 05 PM PDT 32.12 657 - Normal
05/06/2026 06 PM PDT 32.11 654 - Normal
05/06/2026 07 PM PDT 32.10 651 - Normal
05/06/2026 08 PM PDT 32.09 648 - Normal
05/06/2026 09 PM PDT 32.08 645 - Normal
05/06/2026 10 PM PDT 32.07 642 - Normal
05/06/2026 11 PM PDT 32.06 639 - Normal
05/07/2026 12 AM PDT 32.04 633 - Normal
05/07/2026 01 AM PDT 32.03 630 - Normal
05/07/2026 02 AM PDT 32.03 630 0 Normal
05/07/2026 03 AM PDT 32.01 624 - Normal
05/07/2026 04 AM PDT 32.00 622 - Normal
05/07/2026 05 AM PDT 32.00 622 0 Normal
05/07/2026 06 AM PDT 32.00 622 0 Normal
05/07/2026 07 AM PDT 31.99 619 - Normal
05/07/2026 08 AM PDT 31.98 616 - Normal
05/07/2026 09 AM PDT 32.00 622 + Normal
05/07/2026 10 AM PDT 31.99 619 - Normal
05/07/2026 11 AM PDT 32.00 622 + Normal
05/07/2026 12 PM PDT 32.00 622 0 Normal
05/07/2026 01 PM PDT 32.00 622 0 Normal
05/07/2026 02 PM PDT 31.99 619 - Normal
05/07/2026 03 PM PDT 32.00 622 + Normal
05/07/2026 04 PM PDT 31.99 619 - Normal
05/07/2026 05 PM PDT 32.00 622 + Normal
05/07/2026 06 PM PDT 32.00 622 0 Normal
05/07/2026 07 PM PDT 31.97 613 - Normal
05/07/2026 08 PM PDT 31.99 619 + Normal
05/07/2026 09 PM PDT 31.98 616 - Normal
05/07/2026 10 PM PDT 31.97 613 - Normal
05/07/2026 11 PM PDT 31.97 613 0 Normal
05/08/2026 12 AM PDT 31.97 613 0 Normal
05/08/2026 01 AM PDT 31.96 610 - Normal
05/08/2026 02 AM PDT 31.95 607 - Normal
05/08/2026 03 AM PDT 31.95 607 0 Normal
05/08/2026 04 AM PDT 31.96 610 + Normal
05/08/2026 05 AM PDT 31.96 610 0 Normal
05/08/2026 06 AM PDT 31.95 607 - Normal
05/08/2026 07 AM PDT 31.96 610 + Normal
05/08/2026 08 AM PDT 31.97 613 + Normal
05/08/2026 09 AM PDT 31.96 610 - Normal
05/08/2026 10 AM PDT 31.98 616 + Normal
05/08/2026 11 AM PDT 31.95 607 - Normal
05/08/2026 12 PM PDT 31.98 616 + Normal
05/08/2026 01 PM PDT 31.98 616 0 Normal
05/08/2026 02 PM PDT 31.97 613 - Normal
05/08/2026 03 PM PDT 31.97 613 0 Normal
05/08/2026 04 PM PDT 31.98 616 + Normal
05/08/2026 05 PM PDT 31.97 613 - Normal
05/08/2026 06 PM PDT 31.98 616 + Normal
05/08/2026 07 PM PDT 31.98 616 0 Normal
05/08/2026 08 PM PDT 31.97 613 - Normal
05/08/2026 09 PM PDT 31.98 616 + Normal
05/08/2026 10 PM PDT 31.96 610 - Normal
05/08/2026 11 PM PDT 31.97 613 + Normal
05/09/2026 12 AM PDT 31.96 610 - Normal
05/09/2026 01 AM PDT 31.96 610 0 Normal
05/09/2026 02 AM PDT 31.97 613 + Normal
05/09/2026 03 AM PDT 31.96 610 - Normal
05/09/2026 04 AM PDT 31.97 613 + Normal
05/09/2026 05 AM PDT 31.97 613 0 Normal
05/09/2026 06 AM PDT 31.98 616 + Normal
05/09/2026 07 AM PDT 31.98 616 0 Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
05/09/2026 08 AM PDT 31.97 613 Normal
05/09/2026 09 AM PDT 31.97 613 0 Normal
05/09/2026 10 AM PDT 31.96 610 - Normal
05/09/2026 11 AM PDT 31.96 610 0 Normal
05/09/2026 12 PM PDT 31.96 610 0 Normal
05/09/2026 01 PM PDT 31.95 607 - Normal
05/09/2026 02 PM PDT 31.95 607 0 Normal
05/09/2026 03 PM PDT 31.95 607 0 Normal
05/09/2026 04 PM PDT 31.94 604 - Normal
05/09/2026 05 PM PDT 31.94 604 0 Normal
05/09/2026 06 PM PDT 31.94 604 0 Normal
05/09/2026 07 PM PDT 31.94 604 0 Normal
05/09/2026 08 PM PDT 31.93 601 - Normal
05/09/2026 09 PM PDT 31.93 601 0 Normal
05/09/2026 10 PM PDT 31.93 601 0 Normal
05/09/2026 11 PM PDT 31.93 601 0 Normal
05/10/2026 12 AM PDT 31.93 601 0 Normal
05/10/2026 01 AM PDT 31.93 601 0 Normal
05/10/2026 02 AM PDT 31.93 601 0 Normal
05/10/2026 03 AM PDT 31.93 601 0 Normal
05/10/2026 04 AM PDT 31.92 598 - Normal
05/10/2026 05 AM PDT 31.92 598 0 Normal
05/10/2026 06 AM PDT 31.92 598 0 Normal
05/10/2026 07 AM PDT 31.92 598 0 Normal
05/10/2026 08 AM PDT 31.92 598 0 Normal
05/10/2026 09 AM PDT 31.92 598 0 Normal
05/10/2026 10 AM PDT 31.92 598 0 Normal
05/10/2026 11 AM PDT 31.92 598 0 Normal
05/10/2026 12 PM PDT 31.92 598 0 Normal
05/10/2026 01 PM PDT 31.92 598 0 Normal
05/10/2026 02 PM PDT 31.92 598 0 Normal
05/10/2026 03 PM PDT 31.92 598 0 Normal
05/10/2026 04 PM PDT 31.92 598 0 Normal
05/10/2026 05 PM PDT 31.92 598 0 Normal
05/10/2026 06 PM PDT 31.92 598 0 Normal
05/10/2026 07 PM PDT 31.92 598 0 Normal
05/10/2026 08 PM PDT 31.92 598 0 Normal
05/10/2026 09 PM PDT 31.92 598 0 Normal
05/10/2026 10 PM PDT 31.92 598 0 Normal
05/10/2026 11 PM PDT 31.92 598 0 Normal
05/11/2026 12 AM PDT 31.92 598 0 Normal
05/11/2026 01 AM PDT 31.92 598 0 Normal
05/11/2026 02 AM PDT 31.92 598 0 Normal
05/11/2026 03 AM PDT 31.92 598 0 Normal
05/11/2026 04 AM PDT 31.92 598 0 Normal
05/11/2026 05 AM PDT 31.92 598 0 Normal
05/11/2026 06 AM PDT 31.92 598 0 Normal
05/11/2026 07 AM PDT 31.92 598 0 Normal
05/11/2026 08 AM PDT 31.92 598 0 Normal
05/11/2026 09 AM PDT 31.92 598 0 Normal
05/11/2026 10 AM PDT 31.92 598 0 Normal
05/11/2026 11 AM PDT 31.92 598 0 Normal
05/11/2026 12 PM PDT 31.92 598 0 Normal
05/11/2026 01 PM PDT 31.92 598 0 Normal
05/11/2026 02 PM PDT 31.92 598 0 Normal
05/11/2026 03 PM PDT 31.92 598 0 Normal
05/11/2026 04 PM PDT 31.92 598 0 Normal
05/11/2026 05 PM PDT 31.92 598 0 Normal
05/11/2026 06 PM PDT 31.92 598 0 Normal
05/11/2026 07 PM PDT 31.92 598 0 Normal
05/11/2026 08 PM PDT 31.92 598 0 Normal
05/11/2026 09 PM PDT 31.92 598 0 Normal
05/11/2026 10 PM PDT 31.92 598 0 Normal
05/11/2026 11 PM PDT 31.92 598 0 Normal
05/12/2026 12 AM PDT 31.92 598 0 Normal
05/12/2026 01 AM PDT 31.92 598 0 Normal
05/12/2026 02 AM PDT 31.92 598 0 Normal
05/12/2026 03 AM PDT 31.92 598 0 Normal
05/12/2026 04 AM PDT 31.92 598 0 Normal
05/12/2026 05 AM PDT 31.92 598 0 Normal
05/12/2026 06 AM PDT 31.92 598 0 Normal
05/12/2026 07 AM PDT 31.92 598 0 Normal
05/12/2026 08 AM PDT 31.92 598 0 Normal
05/12/2026 09 AM PDT 31.92 598 0 Normal
05/12/2026 10 AM PDT 31.92 598 0 Normal
05/12/2026 11 AM PDT 31.92 598 0 Normal
05/12/2026 12 PM PDT 31.92 598 0 Normal
05/12/2026 01 PM PDT 31.92 598 0 Normal
05/12/2026 02 PM PDT 31.92 598 0 Normal
05/12/2026 03 PM PDT 31.92 598 0 Normal
05/12/2026 04 PM PDT 31.92 598 0 Normal
05/12/2026 05 PM PDT 31.92 598 0 Normal
05/12/2026 06 PM PDT 31.92 598 0 Normal
05/12/2026 07 PM PDT 31.92 598 0 Normal
05/12/2026 08 PM PDT 31.92 598 0 Normal
05/12/2026 09 PM PDT 31.92 598 0 Normal
05/12/2026 10 PM PDT 31.92 598 0 Normal
05/12/2026 11 PM PDT 31.92 598 0 Normal
05/13/2026 12 AM PDT 31.92 598 0 Normal
05/13/2026 01 AM PDT 31.92 598 0 Normal
05/13/2026 02 AM PDT 31.92 598 0 Normal
05/13/2026 03 AM PDT 31.91 595 - Normal
05/13/2026 04 AM PDT 31.91 595 0 Normal
05/13/2026 05 AM PDT 31.91 595 0 Normal
05/13/2026 06 AM PDT 31.91 595 0 Normal
05/13/2026 07 AM PDT 31.91 595 0 Normal
05/13/2026 08 AM PDT 31.91 595 0 Normal
05/13/2026 09 AM PDT 31.91 595 0 Normal
05/13/2026 10 AM PDT 31.91 595 0 Normal
05/13/2026 11 AM PDT 31.91 595 0 Normal
05/13/2026 12 PM PDT 31.91 595 0 Normal
05/13/2026 01 PM PDT 31.91 595 0 Normal
05/13/2026 02 PM PDT 31.91 595 0 Normal
05/13/2026 03 PM PDT 31.91 595 0 Normal
05/13/2026 04 PM PDT 31.91 595 0 Normal
05/13/2026 05 PM PDT 31.91 595 0 Normal
05/13/2026 06 PM PDT 31.90 593 - Normal
05/13/2026 07 PM PDT 31.90 593 0 Normal
05/13/2026 08 PM PDT 31.90 593 0 Normal
05/13/2026 09 PM PDT 31.90 593 0 Normal
05/13/2026 10 PM PDT 31.90 593 0 Normal
05/13/2026 11 PM PDT 31.90 593 0 Normal
05/14/2026 12 AM PDT 31.90 593 0 Normal
05/14/2026 01 AM PDT 31.90 593 0 Normal
05/14/2026 02 AM PDT 31.90 593 0 Normal
05/14/2026 03 AM PDT 31.90 593 0 Normal
05/14/2026 04 AM PDT 31.90 593 0 Normal
05/14/2026 05 AM PDT 31.89 590 - 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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