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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 11 2026 at 8:22 AM PDT | Next Issuance: | May 12 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: 05/11/2026 at 08:23 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 05/06/2026 at 08:00 AM PDT
# Maximum Observed Stage: 32.18 Feet
# Maximum Observed Flow: 675 cfs
#
# Earliest Date & Time of Maximum Forecast: 05/11/2026 at 09:00 AM PDT
# Maximum Forecast Stage: 32.11 Feet
# Maximum Forecast Flow: 654 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
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 31.96 610 - Normal
05/09/2026 08 AM PDT 31.97 613 + Normal
05/09/2026 09 AM PDT 31.96 610 - Normal
05/09/2026 10 AM PDT 31.96 610 0 Normal
05/09/2026 11 AM PDT 31.95 607 - Normal
05/09/2026 12 PM PDT 31.95 607 0 Normal
05/09/2026 01 PM PDT 31.95 607 0 Normal
05/09/2026 02 PM PDT 31.96 610 + Normal
05/09/2026 03 PM PDT 31.95 607 - Normal
05/09/2026 04 PM PDT 31.95 607 0 Normal
05/09/2026 05 PM PDT 31.97 613 + Normal
05/09/2026 06 PM PDT 31.97 613 0 Normal
05/09/2026 07 PM PDT 31.98 616 + Normal
05/09/2026 08 PM PDT 31.97 613 - Normal
05/09/2026 09 PM PDT 31.96 610 - Normal
05/09/2026 10 PM PDT 31.97 613 + Normal
05/09/2026 11 PM PDT 31.96 610 - Normal
05/10/2026 12 AM PDT 31.96 610 0 Normal
05/10/2026 01 AM PDT 31.96 610 0 Normal
05/10/2026 02 AM PDT 31.95 607 - Normal
05/10/2026 03 AM PDT 31.95 607 0 Normal
05/10/2026 04 AM PDT 31.95 607 0 Normal
05/10/2026 05 AM PDT 31.95 607 0 Normal
05/10/2026 06 AM PDT 31.97 613 + Normal
05/10/2026 07 AM PDT 31.98 616 + Normal
05/10/2026 08 AM PDT 31.99 619 + Normal
05/10/2026 09 AM PDT 32.01 624 + Normal
05/10/2026 10 AM PDT 32.03 630 + Normal
05/10/2026 11 AM PDT 32.05 636 + Normal
05/10/2026 12 PM PDT 32.07 642 + Normal
05/10/2026 01 PM PDT 32.07 642 0 Normal
05/10/2026 02 PM PDT 32.08 645 + Normal
05/10/2026 03 PM PDT 32.08 645 0 Normal
05/10/2026 04 PM PDT 32.09 648 + Normal
05/10/2026 05 PM PDT 32.09 648 0 Normal
05/10/2026 06 PM PDT 32.09 648 0 Normal
05/10/2026 07 PM PDT 32.09 648 0 Normal
05/10/2026 08 PM PDT 32.09 648 0 Normal
05/10/2026 09 PM PDT 32.09 648 0 Normal
05/10/2026 10 PM PDT 32.09 648 0 Normal
05/10/2026 11 PM PDT 32.08 645 - Normal
05/11/2026 12 AM PDT 32.09 648 + Normal
05/11/2026 01 AM PDT 32.09 648 0 Normal
05/11/2026 02 AM PDT 32.10 651 + Normal
05/11/2026 03 AM PDT 32.11 654 + Normal
05/11/2026 04 AM PDT 32.11 654 0 Normal
05/11/2026 05 AM PDT 32.11 654 0 Normal
05/11/2026 06 AM PDT 32.11 654 0 Normal
05/11/2026 07 AM PDT 32.11 654 0 Normal
05/11/2026 08 AM PDT 32.11 654 0 Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
05/11/2026 09 AM PDT 32.11 654 Normal
05/11/2026 10 AM PDT 32.11 654 0 Normal
05/11/2026 11 AM PDT 32.11 654 0 Normal
05/11/2026 12 PM PDT 32.11 654 0 Normal
05/11/2026 01 PM PDT 32.11 654 0 Normal
05/11/2026 02 PM PDT 32.11 654 0 Normal
05/11/2026 03 PM PDT 32.11 654 0 Normal
05/11/2026 04 PM PDT 32.11 654 0 Normal
05/11/2026 05 PM PDT 32.11 654 0 Normal
05/11/2026 06 PM PDT 32.11 654 0 Normal
05/11/2026 07 PM PDT 32.11 654 0 Normal
05/11/2026 08 PM PDT 32.11 654 0 Normal
05/11/2026 09 PM PDT 32.11 654 0 Normal
05/11/2026 10 PM PDT 32.11 654 0 Normal
05/11/2026 11 PM PDT 32.11 654 0 Normal
05/12/2026 12 AM PDT 32.11 654 0 Normal
05/12/2026 01 AM PDT 32.11 654 0 Normal
05/12/2026 02 AM PDT 32.11 654 0 Normal
05/12/2026 03 AM PDT 32.11 654 0 Normal
05/12/2026 04 AM PDT 32.10 651 - Normal
05/12/2026 05 AM PDT 32.10 651 0 Normal
05/12/2026 06 AM PDT 32.10 651 0 Normal
05/12/2026 07 AM PDT 32.09 648 - Normal
05/12/2026 08 AM PDT 32.09 648 0 Normal
05/12/2026 09 AM PDT 32.09 648 0 Normal
05/12/2026 10 AM PDT 32.08 645 - Normal
05/12/2026 11 AM PDT 32.08 645 0 Normal
05/12/2026 12 PM PDT 32.07 642 - Normal
05/12/2026 01 PM PDT 32.07 642 0 Normal
05/12/2026 02 PM PDT 32.06 639 - Normal
05/12/2026 03 PM PDT 32.06 639 0 Normal
05/12/2026 04 PM PDT 32.05 636 - Normal
05/12/2026 05 PM PDT 32.05 636 0 Normal
05/12/2026 06 PM PDT 32.04 633 - Normal
05/12/2026 07 PM PDT 32.03 630 - Normal
05/12/2026 08 PM PDT 32.03 630 0 Normal
05/12/2026 09 PM PDT 32.02 627 - Normal
05/12/2026 10 PM PDT 32.01 624 - Normal
05/12/2026 11 PM PDT 32.01 624 0 Normal
05/13/2026 12 AM PDT 32.00 622 - Normal
05/13/2026 01 AM PDT 31.99 619 - Normal
05/13/2026 02 AM PDT 31.98 616 - Normal
05/13/2026 03 AM PDT 31.98 616 0 Normal
05/13/2026 04 AM PDT 31.97 613 - Normal
05/13/2026 05 AM PDT 31.96 610 - Normal
05/13/2026 06 AM PDT 31.95 607 - Normal
05/13/2026 07 AM PDT 31.95 607 0 Normal
05/13/2026 08 AM PDT 31.94 604 - Normal
05/13/2026 09 AM PDT 31.93 601 - Normal
05/13/2026 10 AM PDT 31.92 598 - Normal
05/13/2026 11 AM PDT 31.91 595 - Normal
05/13/2026 12 PM PDT 31.91 595 0 Normal
05/13/2026 01 PM PDT 31.90 593 - Normal
05/13/2026 02 PM PDT 31.89 590 - Normal
05/13/2026 03 PM PDT 31.88 587 - Normal
05/13/2026 04 PM PDT 31.87 584 - Normal
05/13/2026 05 PM PDT 31.87 584 0 Normal
05/13/2026 06 PM PDT 31.86 581 - Normal
05/13/2026 07 PM PDT 31.85 578 - Normal
05/13/2026 08 PM PDT 31.84 575 - Normal
05/13/2026 09 PM PDT 31.84 575 0 Normal
05/13/2026 10 PM PDT 31.83 573 - Normal
05/13/2026 11 PM PDT 31.82 570 - Normal
05/14/2026 12 AM PDT 31.81 567 - Normal
05/14/2026 01 AM PDT 31.81 567 0 Normal
05/14/2026 02 AM PDT 31.80 564 - Normal
05/14/2026 03 AM PDT 31.79 561 - Normal
05/14/2026 04 AM PDT 31.79 561 0 Normal
05/14/2026 05 AM PDT 31.78 559 - Normal
05/14/2026 06 AM PDT 31.77 556 - Normal
05/14/2026 07 AM PDT 31.76 553 - Normal
05/14/2026 08 AM PDT 31.76 553 0 Normal
05/14/2026 09 AM PDT 31.75 550 - Normal
05/14/2026 10 AM PDT 31.75 550 0 Normal
05/14/2026 11 AM PDT 31.74 547 - Normal
05/14/2026 12 PM PDT 31.73 545 - Normal
05/14/2026 01 PM PDT 31.73 545 0 Normal
05/14/2026 02 PM PDT 31.72 542 - Normal
05/14/2026 03 PM PDT 31.71 539 - Normal
05/14/2026 04 PM PDT 31.71 539 0 Normal
05/14/2026 05 PM PDT 31.70 536 - Normal
05/14/2026 06 PM PDT 31.70 536 0 Normal
05/14/2026 07 PM PDT 31.69 534 - Normal
05/14/2026 08 PM PDT 31.68 531 - Normal
05/14/2026 09 PM PDT 31.68 531 0 Normal
05/14/2026 10 PM PDT 31.68 531 0 Normal
05/14/2026 11 PM PDT 31.67 528 - Normal
05/15/2026 12 AM PDT 31.67 528 0 Normal
05/15/2026 01 AM PDT 31.66 525 - Normal
05/15/2026 02 AM PDT 31.66 525 0 Normal
05/15/2026 03 AM PDT 31.65 523 - Normal
05/15/2026 04 AM PDT 31.64 520 - Normal
05/15/2026 05 AM PDT 31.64 520 0 Normal
05/15/2026 06 AM PDT 31.64 520 0 Normal
05/15/2026 07 AM PDT 31.63 517 - Normal
05/15/2026 08 AM PDT 31.63 517 0 Normal
05/15/2026 09 AM PDT 31.62 514 - Normal
05/15/2026 10 AM PDT 31.62 514 0 Normal
05/15/2026 11 AM PDT 31.62 514 0 Normal
05/15/2026 12 PM PDT 31.61 512 - Normal
05/15/2026 01 PM PDT 31.61 512 0 Normal
05/15/2026 02 PM PDT 31.60 509 - Normal
05/15/2026 03 PM PDT 31.60 509 0 Normal
05/15/2026 04 PM PDT 31.60 509 0 Normal
05/15/2026 05 PM PDT 31.59 506 - Normal
05/15/2026 06 PM PDT 31.59 506 0 Normal
05/15/2026 07 PM PDT 31.59 506 0 Normal
05/15/2026 08 PM PDT 31.58 503 - Normal
05/15/2026 09 PM PDT 31.58 503 0 Normal
05/15/2026 10 PM PDT 31.58 503 0 Normal
05/15/2026 11 PM PDT 31.57 501 - Normal
05/16/2026 12 AM PDT 31.57 501 0 Normal
05/16/2026 01 AM PDT 31.57 501 0 Normal
05/16/2026 02 AM PDT 31.56 498 - Normal
05/16/2026 03 AM PDT 31.56 498 0 Normal
05/16/2026 04 AM PDT 31.56 498 0 Normal
05/16/2026 05 AM PDT 31.56 498 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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