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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: | Aug 09 2026 at 7:42 AM PDT | Next Issuance: | Aug 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: 08/09/2026 at 07:42 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 08/04/2026 at 07:00 AM PDT
# Maximum Observed Stage: 31.86 Feet
# Maximum Observed Flow: 832 cfs
#
# Earliest Date & Time of Maximum Forecast: 08/09/2026 at 08:00 AM PDT
# Maximum Forecast Stage: 31.22 Feet
# Maximum Forecast Flow: 622 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
08/04/2026 07 AM PDT 31.86 832 Normal
08/04/2026 08 AM PDT 31.85 828 - Normal
08/04/2026 09 AM PDT 31.85 828 0 Normal
08/04/2026 10 AM PDT 31.84 825 - Normal
08/04/2026 11 AM PDT 31.84 825 0 Normal
08/04/2026 12 PM PDT 31.85 828 + Normal
08/04/2026 01 PM PDT 31.85 828 0 Normal
08/04/2026 02 PM PDT 31.85 828 0 Normal
08/04/2026 03 PM PDT 31.83 821 - Normal
08/04/2026 04 PM PDT 31.83 821 0 Normal
08/04/2026 05 PM PDT 31.82 818 - Normal
08/04/2026 06 PM PDT 31.81 814 - Normal
08/04/2026 07 PM PDT 31.82 818 + Normal
08/04/2026 08 PM PDT 31.83 821 + Normal
08/04/2026 09 PM PDT 31.80 811 - Normal
08/04/2026 10 PM PDT 31.80 811 0 Normal
08/04/2026 11 PM PDT 31.81 814 + Normal
08/05/2026 12 AM PDT 31.79 807 - Normal
08/05/2026 01 AM PDT 31.79 807 0 Normal
08/05/2026 02 AM PDT 31.78 804 - Normal
08/05/2026 03 AM PDT 31.77 800 - Normal
08/05/2026 04 AM PDT 31.78 804 + Normal
08/05/2026 05 AM PDT 31.77 800 - Normal
08/05/2026 06 AM PDT 31.75 793 - Normal
08/05/2026 07 AM PDT 31.75 793 0 Normal
08/05/2026 08 AM PDT 31.74 790 - Normal
08/05/2026 09 AM PDT 31.73 786 - Normal
08/05/2026 10 AM PDT 31.71 779 - Normal
08/05/2026 11 AM PDT 31.72 783 + Normal
08/05/2026 12 PM PDT 31.74 790 + Normal
08/05/2026 01 PM PDT 31.69 772 - Normal
08/05/2026 02 PM PDT 31.69 772 0 Normal
08/05/2026 03 PM PDT 31.68 769 - Normal
08/05/2026 04 PM PDT 31.66 762 - Normal
08/05/2026 05 PM PDT 31.66 762 0 Normal
08/05/2026 06 PM PDT 31.65 759 - Normal
08/05/2026 07 PM PDT 31.63 752 - Normal
08/05/2026 08 PM PDT 31.62 748 - Normal
08/05/2026 09 PM PDT 31.62 748 0 Normal
08/05/2026 10 PM PDT 31.60 742 - Normal
08/05/2026 11 PM PDT 31.59 738 - Normal
08/06/2026 12 AM PDT 31.58 735 - Normal
08/06/2026 01 AM PDT 31.58 735 0 Normal
08/06/2026 02 AM PDT 31.58 735 0 Normal
08/06/2026 03 AM PDT 31.57 731 - Normal
08/06/2026 04 AM PDT 31.56 728 - Normal
08/06/2026 05 AM PDT 31.57 731 + Normal
08/06/2026 06 AM PDT 31.57 731 0 Normal
08/06/2026 07 AM PDT 31.56 728 - Normal
08/06/2026 08 AM PDT 31.56 728 0 Normal
08/06/2026 09 AM PDT 31.57 731 + Normal
08/06/2026 10 AM PDT 31.54 721 - Normal
08/06/2026 11 AM PDT 31.55 725 + Normal
08/06/2026 12 PM PDT 31.59 738 + Normal
08/06/2026 01 PM PDT 31.54 721 - Normal
08/06/2026 02 PM PDT 31.54 721 0 Normal
08/06/2026 03 PM PDT 31.53 718 - Normal
08/06/2026 04 PM PDT 31.51 711 - Normal
08/06/2026 05 PM PDT 31.49 705 - Normal
08/06/2026 06 PM PDT 31.48 701 - Normal
08/06/2026 07 PM PDT 31.47 698 - Normal
08/06/2026 08 PM PDT 31.47 698 0 Normal
08/06/2026 09 PM PDT 31.47 698 0 Normal
08/06/2026 10 PM PDT 31.46 695 - Normal
08/06/2026 11 PM PDT 31.48 701 + Normal
08/07/2026 12 AM PDT 31.44 688 - Normal
08/07/2026 01 AM PDT 31.45 691 + Normal
08/07/2026 02 AM PDT 31.43 685 - Normal
08/07/2026 03 AM PDT 31.41 678 - Normal
08/07/2026 04 AM PDT 31.45 691 + Normal
08/07/2026 05 AM PDT 31.42 682 - Normal
08/07/2026 06 AM PDT 31.42 682 0 Normal
08/07/2026 07 AM PDT 31.42 682 0 Normal
08/07/2026 08 AM PDT 31.38 669 - Normal
08/07/2026 09 AM PDT 31.42 682 + Normal
08/07/2026 10 AM PDT 31.41 678 - Normal
08/07/2026 11 AM PDT 31.38 669 - Normal
08/07/2026 12 PM PDT 31.41 678 + Normal
08/07/2026 01 PM PDT 31.38 669 - Normal
08/07/2026 02 PM PDT 31.36 663 - Normal
08/07/2026 03 PM PDT 31.37 666 + Normal
08/07/2026 04 PM PDT 31.31 648 - Normal
08/07/2026 05 PM PDT 31.31 648 0 Normal
08/07/2026 06 PM PDT 31.29 642 - Normal
08/07/2026 07 PM PDT 31.25 630 - Normal
08/07/2026 08 PM PDT 31.27 636 + Normal
08/07/2026 09 PM PDT 31.24 627 - Normal
08/07/2026 10 PM PDT 31.25 630 + Normal
08/07/2026 11 PM PDT 31.25 630 0 Normal
08/08/2026 12 AM PDT 31.23 624 - Normal
08/08/2026 01 AM PDT 31.23 624 0 Normal
08/08/2026 02 AM PDT 31.22 622 - Normal
08/08/2026 03 AM PDT 31.21 619 - Normal
08/08/2026 04 AM PDT 31.20 616 - Normal
08/08/2026 05 AM PDT 31.19 613 - Normal
08/08/2026 06 AM PDT 31.17 607 - Normal
08/08/2026 07 AM PDT 31.14 598 - Normal
08/08/2026 08 AM PDT 31.14 598 0 Normal
08/08/2026 09 AM PDT 31.13 595 - Normal
08/08/2026 10 AM PDT 31.15 601 + Normal
08/08/2026 11 AM PDT 31.15 601 0 Normal
08/08/2026 12 PM PDT 31.15 601 0 Normal
08/08/2026 01 PM PDT 31.16 604 + Normal
08/08/2026 02 PM PDT 31.14 598 - Normal
08/08/2026 03 PM PDT 31.18 610 + Normal
08/08/2026 04 PM PDT 31.16 604 - Normal
08/08/2026 05 PM PDT 31.15 601 - Normal
08/08/2026 06 PM PDT 31.18 610 + Normal
08/08/2026 07 PM PDT 31.15 601 - Normal
08/08/2026 08 PM PDT 31.18 610 + Normal
08/08/2026 09 PM PDT 31.16 604 - Normal
08/08/2026 10 PM PDT 31.15 601 - Normal
08/08/2026 11 PM PDT 31.17 607 + Normal
08/09/2026 12 AM PDT 31.16 604 - Normal
08/09/2026 01 AM PDT 31.18 610 + Normal
08/09/2026 02 AM PDT 31.20 616 + Normal
08/09/2026 03 AM PDT 31.21 619 + Normal
08/09/2026 04 AM PDT 31.22 622 + Normal
08/09/2026 05 AM PDT 31.20 616 - Normal
08/09/2026 06 AM PDT 31.22 622 + Normal
08/09/2026 07 AM PDT 31.22 622 0 Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
08/09/2026 08 AM PDT 31.22 622 Normal
08/09/2026 09 AM PDT 31.22 622 0 Normal
08/09/2026 10 AM PDT 31.21 619 - Normal
08/09/2026 11 AM PDT 31.21 619 0 Normal
08/09/2026 12 PM PDT 31.20 616 - Normal
08/09/2026 01 PM PDT 31.20 616 0 Normal
08/09/2026 02 PM PDT 31.19 613 - Normal
08/09/2026 03 PM PDT 31.19 613 0 Normal
08/09/2026 04 PM PDT 31.18 610 - Normal
08/09/2026 05 PM PDT 31.18 610 0 Normal
08/09/2026 06 PM PDT 31.17 607 - Normal
08/09/2026 07 PM PDT 31.16 604 - Normal
08/09/2026 08 PM PDT 31.16 604 0 Normal
08/09/2026 09 PM PDT 31.15 601 - Normal
08/09/2026 10 PM PDT 31.14 598 - Normal
08/09/2026 11 PM PDT 31.14 598 0 Normal
08/10/2026 12 AM PDT 31.13 595 - Normal
08/10/2026 01 AM PDT 31.12 593 - Normal
08/10/2026 02 AM PDT 31.11 590 - Normal
08/10/2026 03 AM PDT 31.11 590 0 Normal
08/10/2026 04 AM PDT 31.10 587 - Normal
08/10/2026 05 AM PDT 31.10 587 0 Normal
08/10/2026 06 AM PDT 31.09 584 - Normal
08/10/2026 07 AM PDT 31.09 584 0 Normal
08/10/2026 08 AM PDT 31.08 581 - Normal
08/10/2026 09 AM PDT 31.08 581 0 Normal
08/10/2026 10 AM PDT 31.07 578 - Normal
08/10/2026 11 AM PDT 31.07 578 0 Normal
08/10/2026 12 PM PDT 31.06 575 - Normal
08/10/2026 01 PM PDT 31.06 575 0 Normal
08/10/2026 02 PM PDT 31.05 573 - Normal
08/10/2026 03 PM PDT 31.05 573 0 Normal
08/10/2026 04 PM PDT 31.05 573 0 Normal
08/10/2026 05 PM PDT 31.04 570 - Normal
08/10/2026 06 PM PDT 31.04 570 0 Normal
08/10/2026 07 PM PDT 31.04 570 0 Normal
08/10/2026 08 PM PDT 31.03 567 - Normal
08/10/2026 09 PM PDT 31.03 567 0 Normal
08/10/2026 10 PM PDT 31.03 567 0 Normal
08/10/2026 11 PM PDT 31.02 564 - Normal
08/11/2026 12 AM PDT 31.02 564 0 Normal
08/11/2026 01 AM PDT 31.02 564 0 Normal
08/11/2026 02 AM PDT 31.02 564 0 Normal
08/11/2026 03 AM PDT 31.02 564 0 Normal
08/11/2026 04 AM PDT 31.01 561 - Normal
08/11/2026 05 AM PDT 31.01 561 0 Normal
08/11/2026 06 AM PDT 31.01 561 0 Normal
08/11/2026 07 AM PDT 31.00 559 - Normal
08/11/2026 08 AM PDT 31.00 559 0 Normal
08/11/2026 09 AM PDT 31.00 559 0 Normal
08/11/2026 10 AM PDT 31.00 559 0 Normal
08/11/2026 11 AM PDT 31.00 559 0 Normal
08/11/2026 12 PM PDT 30.99 556 - Normal
08/11/2026 01 PM PDT 30.99 556 0 Normal
08/11/2026 02 PM PDT 30.99 556 0 Normal
08/11/2026 03 PM PDT 30.99 556 0 Normal
08/11/2026 04 PM PDT 30.99 556 0 Normal
08/11/2026 05 PM PDT 30.99 556 0 Normal
08/11/2026 06 PM PDT 30.98 553 - Normal
08/11/2026 07 PM PDT 30.98 553 0 Normal
08/11/2026 08 PM PDT 30.98 553 0 Normal
08/11/2026 09 PM PDT 30.98 553 0 Normal
08/11/2026 10 PM PDT 30.98 553 0 Normal
08/11/2026 11 PM PDT 30.98 553 0 Normal
08/12/2026 12 AM PDT 30.98 553 0 Normal
08/12/2026 01 AM PDT 30.98 553 0 Normal
08/12/2026 02 AM PDT 30.98 553 0 Normal
08/12/2026 03 AM PDT 30.98 553 0 Normal
08/12/2026 04 AM PDT 30.97 550 - Normal
08/12/2026 05 AM PDT 30.97 550 0 Normal
08/12/2026 06 AM PDT 30.97 550 0 Normal
08/12/2026 07 AM PDT 30.97 550 0 Normal
08/12/2026 08 AM PDT 30.97 550 0 Normal
08/12/2026 09 AM PDT 30.97 550 0 Normal
08/12/2026 10 AM PDT 30.97 550 0 Normal
08/12/2026 11 AM PDT 30.97 550 0 Normal
08/12/2026 12 PM PDT 30.97 550 0 Normal
08/12/2026 01 PM PDT 30.97 550 0 Normal
08/12/2026 02 PM PDT 30.97 550 0 Normal
08/12/2026 03 PM PDT 30.97 550 0 Normal
08/12/2026 04 PM PDT 30.96 547 - Normal
08/12/2026 05 PM PDT 30.96 547 0 Normal
08/12/2026 06 PM PDT 30.96 547 0 Normal
08/12/2026 07 PM PDT 30.96 547 0 Normal
08/12/2026 08 PM PDT 30.96 547 0 Normal
08/12/2026 09 PM PDT 30.96 547 0 Normal
08/12/2026 10 PM PDT 30.96 547 0 Normal
08/12/2026 11 PM PDT 30.96 547 0 Normal
08/13/2026 12 AM PDT 30.96 547 0 Normal
08/13/2026 01 AM PDT 30.96 547 0 Normal
08/13/2026 02 AM PDT 30.96 547 0 Normal
08/13/2026 03 AM PDT 30.96 547 0 Normal
08/13/2026 04 AM PDT 30.96 547 0 Normal
08/13/2026 05 AM PDT 30.96 547 0 Normal
08/13/2026 06 AM PDT 30.96 547 0 Normal
08/13/2026 07 AM PDT 30.96 547 0 Normal
08/13/2026 08 AM PDT 30.96 547 0 Normal
08/13/2026 09 AM PDT 30.96 547 0 Normal
08/13/2026 10 AM PDT 30.96 547 0 Normal
08/13/2026 11 AM PDT 30.96 547 0 Normal
08/13/2026 12 PM PDT 30.96 547 0 Normal
08/13/2026 01 PM PDT 30.96 547 0 Normal
08/13/2026 02 PM PDT 30.96 547 0 Normal
08/13/2026 03 PM PDT 30.96 547 0 Normal
08/13/2026 04 PM PDT 30.96 547 0 Normal
08/13/2026 05 PM PDT 30.96 547 0 Normal
08/13/2026 06 PM PDT 30.96 547 0 Normal
08/13/2026 07 PM PDT 30.96 547 0 Normal
08/13/2026 08 PM PDT 30.96 547 0 Normal
08/13/2026 09 PM PDT 30.96 547 0 Normal
08/13/2026 10 PM PDT 30.96 547 0 Normal
08/13/2026 11 PM PDT 30.96 547 0 Normal
08/14/2026 12 AM PDT 30.96 547 0 Normal
08/14/2026 01 AM PDT 30.96 547 0 Normal
08/14/2026 02 AM PDT 30.96 547 0 Normal
08/14/2026 03 AM PDT 30.96 547 0 Normal
08/14/2026 04 AM PDT 30.96 547 0 Normal
08/14/2026 05 AM PDT 30.96 547 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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