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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: | Oct 12 2026 at 7:53 AM PDT | Next Issuance: | Oct 13 2026 at 9:00 AM PDT
| |
| Action: 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: 10/12/2026 at 07:53 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 10/12/2026 at 07:00 AM PDT
# Maximum Observed Stage: 30.90 Feet
# Maximum Observed Flow: 531 cfs
#
# Earliest Date & Time of Maximum Forecast: 10/17/2026 at 12:00 AM PDT
# Maximum Forecast Stage: 31.01 Feet
# Maximum Forecast Flow: 561 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
10/07/2026 07 AM PDT 30.41 402 Normal
10/07/2026 08 AM PDT 30.40 400 - Normal
10/07/2026 09 AM PDT 30.41 402 + Normal
10/07/2026 10 AM PDT 30.41 402 0 Normal
10/07/2026 11 AM PDT 30.42 405 + Normal
10/07/2026 12 PM PDT 30.44 410 + Normal
10/07/2026 01 PM PDT 30.43 407 - Normal
10/07/2026 02 PM PDT 30.43 407 0 Normal
10/07/2026 03 PM PDT 30.43 407 0 Normal
10/07/2026 04 PM PDT 30.42 405 - Normal
10/07/2026 05 PM PDT 30.43 407 + Normal
10/07/2026 06 PM PDT 30.44 410 + Normal
10/07/2026 07 PM PDT 30.43 407 - Normal
10/07/2026 08 PM PDT 30.43 407 0 Normal
10/07/2026 09 PM PDT 30.42 405 - Normal
10/07/2026 10 PM PDT 30.42 405 0 Normal
10/07/2026 11 PM PDT 30.42 405 0 Normal
10/08/2026 12 AM PDT 30.43 407 + Normal
10/08/2026 01 AM PDT 30.44 410 + Normal
10/08/2026 02 AM PDT 30.44 410 0 Normal
10/08/2026 03 AM PDT 30.45 412 + Normal
10/08/2026 04 AM PDT 30.46 415 + Normal
10/08/2026 05 AM PDT 30.46 415 0 Normal
10/08/2026 06 AM PDT 30.47 417 + Normal
10/08/2026 07 AM PDT 30.47 417 0 Normal
10/08/2026 08 AM PDT 30.47 417 0 Normal
10/08/2026 09 AM PDT 30.49 423 + Normal
10/08/2026 10 AM PDT 30.50 425 + Normal
10/08/2026 11 AM PDT 30.51 428 + Normal
10/08/2026 12 PM PDT 30.53 433 + Normal
10/08/2026 01 PM PDT 30.54 435 + Normal
10/08/2026 02 PM PDT 30.54 435 0 Normal
10/08/2026 03 PM PDT 30.55 438 + Normal
10/08/2026 04 PM PDT 30.53 433 - Normal
10/08/2026 05 PM PDT 30.54 435 + Normal
10/08/2026 06 PM PDT 30.54 435 0 Normal
10/08/2026 07 PM PDT 30.53 433 - Normal
10/08/2026 08 PM PDT 30.52 430 - Normal
10/08/2026 09 PM PDT 30.53 433 + Normal
10/08/2026 10 PM PDT 30.52 430 - Normal
10/08/2026 11 PM PDT 30.51 428 - Normal
10/09/2026 12 AM PDT 30.52 430 + Normal
10/09/2026 01 AM PDT 30.52 430 0 Normal
10/09/2026 02 AM PDT 30.51 428 - Normal
10/09/2026 03 AM PDT 30.53 433 + Normal
10/09/2026 04 AM PDT 30.53 433 0 Normal
10/09/2026 05 AM PDT 30.52 430 - Normal
10/09/2026 06 AM PDT 30.52 430 0 Normal
10/09/2026 07 AM PDT 30.51 428 - Normal
10/09/2026 08 AM PDT 30.49 423 - Normal
10/09/2026 09 AM PDT 30.48 420 - Normal
10/09/2026 10 AM PDT 30.48 420 0 Normal
10/09/2026 11 AM PDT 30.49 423 + Normal
10/09/2026 12 PM PDT 30.51 428 + Normal
10/09/2026 01 PM PDT 30.54 435 + Normal
10/09/2026 02 PM PDT 30.55 438 + Normal
10/09/2026 03 PM PDT 30.57 443 + Normal
10/09/2026 04 PM PDT 30.58 445 + Normal
10/09/2026 05 PM PDT 30.58 445 0 Normal
10/09/2026 06 PM PDT 30.59 448 + Normal
10/09/2026 07 PM PDT 30.59 448 0 Normal
10/09/2026 08 PM PDT 30.59 448 0 Normal
10/09/2026 09 PM PDT 30.59 448 0 Normal
10/09/2026 10 PM PDT 30.59 448 0 Normal
10/09/2026 11 PM PDT 30.59 448 0 Normal
10/10/2026 12 AM PDT 30.59 448 0 Normal
10/10/2026 01 AM PDT 30.59 448 0 Normal
10/10/2026 02 AM PDT 30.60 451 + Normal
10/10/2026 03 AM PDT 30.61 453 + Normal
10/10/2026 04 AM PDT 30.61 453 0 Normal
10/10/2026 05 AM PDT 30.61 453 0 Normal
10/10/2026 06 AM PDT 30.60 451 - Normal
10/10/2026 07 AM PDT 30.59 448 - Normal
10/10/2026 08 AM PDT 30.58 445 - Normal
10/10/2026 09 AM PDT 30.58 445 0 Normal
10/10/2026 10 AM PDT 30.58 445 0 Normal
10/10/2026 11 AM PDT 30.58 445 0 Normal
10/10/2026 12 PM PDT 30.60 451 + Normal
10/10/2026 01 PM PDT 30.59 448 - Normal
10/10/2026 02 PM PDT 30.58 445 - Normal
10/10/2026 03 PM PDT 30.59 448 + Normal
10/10/2026 04 PM PDT 30.58 445 - Normal
10/10/2026 05 PM PDT 30.61 453 + Normal
10/10/2026 06 PM PDT 30.62 456 + Normal
10/10/2026 07 PM PDT 30.61 453 - Normal
10/10/2026 08 PM PDT 30.62 456 + Normal
10/10/2026 09 PM PDT 30.64 461 + Normal
10/10/2026 10 PM PDT 30.64 461 0 Normal
10/10/2026 11 PM PDT 30.65 464 + Normal
10/11/2026 12 AM PDT 30.66 466 + Normal
10/11/2026 01 AM PDT 30.66 466 0 Normal
10/11/2026 02 AM PDT 30.67 469 + Normal
10/11/2026 03 AM PDT 30.68 472 + Normal
10/11/2026 04 AM PDT 30.69 474 + Normal
10/11/2026 05 AM PDT 30.70 477 + Normal
10/11/2026 06 AM PDT 30.70 477 0 Normal
10/11/2026 07 AM PDT 30.72 482 + Normal
10/11/2026 08 AM PDT 30.72 482 0 Normal
10/11/2026 09 AM PDT 30.74 487 + Normal
10/11/2026 10 AM PDT 30.75 490 + Normal
10/11/2026 11 AM PDT 30.77 495 + Normal
10/11/2026 12 PM PDT 30.77 495 0 Normal
10/11/2026 01 PM PDT 30.78 498 + Normal
10/11/2026 02 PM PDT 30.81 506 + Normal
10/11/2026 03 PM PDT 30.83 512 + Normal
10/11/2026 04 PM PDT 30.85 517 + Normal
10/11/2026 05 PM PDT 30.87 523 + Normal
10/11/2026 06 PM PDT 30.88 525 + Normal
10/11/2026 07 PM PDT 30.89 528 + Normal
10/11/2026 08 PM PDT 30.89 528 0 Normal
10/11/2026 09 PM PDT 30.89 528 0 Normal
10/11/2026 10 PM PDT 30.90 531 + Normal
10/11/2026 11 PM PDT 30.89 528 - Normal
10/12/2026 12 AM PDT 30.89 528 0 Normal
10/12/2026 01 AM PDT 30.88 525 - Normal
10/12/2026 02 AM PDT 30.88 525 0 Normal
10/12/2026 03 AM PDT 30.88 525 0 Normal
10/12/2026 04 AM PDT 30.88 525 0 Normal
10/12/2026 05 AM PDT 30.89 528 + Normal
10/12/2026 06 AM PDT 30.90 531 + Normal
10/12/2026 07 AM PDT 30.90 531 0 Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
10/12/2026 08 AM PDT 30.91 534 Normal
10/12/2026 09 AM PDT 30.91 534 0 Normal
10/12/2026 10 AM PDT 30.92 536 + Normal
10/12/2026 11 AM PDT 30.92 536 0 Normal
10/12/2026 12 PM PDT 30.92 536 0 Normal
10/12/2026 01 PM PDT 30.93 539 + Normal
10/12/2026 02 PM PDT 30.93 539 0 Normal
10/12/2026 03 PM PDT 30.93 539 0 Normal
10/12/2026 04 PM PDT 30.94 542 + Normal
10/12/2026 05 PM PDT 30.94 542 0 Normal
10/12/2026 06 PM PDT 30.94 542 0 Normal
10/12/2026 07 PM PDT 30.95 545 + Normal
10/12/2026 08 PM PDT 30.95 545 0 Normal
10/12/2026 09 PM PDT 30.96 547 + Normal
10/12/2026 10 PM PDT 30.96 547 0 Normal
10/12/2026 11 PM PDT 30.96 547 0 Normal
10/13/2026 12 AM PDT 30.97 550 + Normal
10/13/2026 01 AM PDT 30.97 550 0 Normal
10/13/2026 02 AM PDT 30.97 550 0 Normal
10/13/2026 03 AM PDT 30.98 553 + Normal
10/13/2026 04 AM PDT 30.98 553 0 Normal
10/13/2026 05 AM PDT 30.98 553 0 Normal
10/13/2026 06 AM PDT 30.98 553 0 Normal
10/13/2026 07 AM PDT 30.99 556 + Normal
10/13/2026 08 AM PDT 30.99 556 0 Normal
10/13/2026 09 AM PDT 30.99 556 0 Normal
10/13/2026 10 AM PDT 30.99 556 0 Normal
10/13/2026 11 AM PDT 30.99 556 0 Normal
10/13/2026 12 PM PDT 30.99 556 0 Normal
10/13/2026 01 PM PDT 30.99 556 0 Normal
10/13/2026 02 PM PDT 30.99 556 0 Normal
10/13/2026 03 PM PDT 30.99 556 0 Normal
10/13/2026 04 PM PDT 31.00 559 + Normal
10/13/2026 05 PM PDT 31.00 559 0 Normal
10/13/2026 06 PM PDT 31.00 559 0 Normal
10/13/2026 07 PM PDT 31.00 559 0 Normal
10/13/2026 08 PM PDT 31.00 559 0 Normal
10/13/2026 09 PM PDT 31.00 559 0 Normal
10/13/2026 10 PM PDT 31.00 559 0 Normal
10/13/2026 11 PM PDT 31.00 559 0 Normal
10/14/2026 12 AM PDT 31.00 559 0 Normal
10/14/2026 01 AM PDT 30.99 556 - Normal
10/14/2026 02 AM PDT 30.99 556 0 Normal
10/14/2026 03 AM PDT 30.99 556 0 Normal
10/14/2026 04 AM PDT 30.99 556 0 Normal
10/14/2026 05 AM PDT 30.99 556 0 Normal
10/14/2026 06 AM PDT 30.99 556 0 Normal
10/14/2026 07 AM PDT 30.99 556 0 Normal
10/14/2026 08 AM PDT 30.99 556 0 Normal
10/14/2026 09 AM PDT 30.99 556 0 Normal
10/14/2026 10 AM PDT 30.99 556 0 Normal
10/14/2026 11 AM PDT 30.99 556 0 Normal
10/14/2026 12 PM PDT 30.99 556 0 Normal
10/14/2026 01 PM PDT 30.99 556 0 Normal
10/14/2026 02 PM PDT 30.99 556 0 Normal
10/14/2026 03 PM PDT 30.99 556 0 Normal
10/14/2026 04 PM PDT 30.99 556 0 Normal
10/14/2026 05 PM PDT 30.99 556 0 Normal
10/14/2026 06 PM PDT 30.99 556 0 Normal
10/14/2026 07 PM PDT 30.99 556 0 Normal
10/14/2026 08 PM PDT 30.99 556 0 Normal
10/14/2026 09 PM PDT 30.99 556 0 Normal
10/14/2026 10 PM PDT 30.99 556 0 Normal
10/14/2026 11 PM PDT 30.99 556 0 Normal
10/15/2026 12 AM PDT 30.99 556 0 Normal
10/15/2026 01 AM PDT 30.99 556 0 Normal
10/15/2026 02 AM PDT 30.99 556 0 Normal
10/15/2026 03 AM PDT 30.99 556 0 Normal
10/15/2026 04 AM PDT 30.99 556 0 Normal
10/15/2026 05 AM PDT 30.99 556 0 Normal
10/15/2026 06 AM PDT 30.99 556 0 Normal
10/15/2026 07 AM PDT 30.99 556 0 Normal
10/15/2026 08 AM PDT 30.99 556 0 Normal
10/15/2026 09 AM PDT 30.99 556 0 Normal
10/15/2026 10 AM PDT 30.99 556 0 Normal
10/15/2026 11 AM PDT 30.99 556 0 Normal
10/15/2026 12 PM PDT 30.99 556 0 Normal
10/15/2026 01 PM PDT 30.99 556 0 Normal
10/15/2026 02 PM PDT 30.99 556 0 Normal
10/15/2026 03 PM PDT 30.99 556 0 Normal
10/15/2026 04 PM PDT 30.99 556 0 Normal
10/15/2026 05 PM PDT 30.99 556 0 Normal
10/15/2026 06 PM PDT 30.99 556 0 Normal
10/15/2026 07 PM PDT 30.99 556 0 Normal
10/15/2026 08 PM PDT 30.99 556 0 Normal
10/15/2026 09 PM PDT 30.99 556 0 Normal
10/15/2026 10 PM PDT 30.99 556 0 Normal
10/15/2026 11 PM PDT 30.99 556 0 Normal
10/16/2026 12 AM PDT 30.99 556 0 Normal
10/16/2026 01 AM PDT 30.99 556 0 Normal
10/16/2026 02 AM PDT 30.99 556 0 Normal
10/16/2026 03 AM PDT 30.99 556 0 Normal
10/16/2026 04 AM PDT 30.99 556 0 Normal
10/16/2026 05 AM PDT 30.99 556 0 Normal
10/16/2026 06 AM PDT 31.00 559 + Normal
10/16/2026 07 AM PDT 31.00 559 0 Normal
10/16/2026 08 AM PDT 31.00 559 0 Normal
10/16/2026 09 AM PDT 31.00 559 0 Normal
10/16/2026 10 AM PDT 31.00 559 0 Normal
10/16/2026 11 AM PDT 31.00 559 0 Normal
10/16/2026 12 PM PDT 31.00 559 0 Normal
10/16/2026 01 PM PDT 31.00 559 0 Normal
10/16/2026 02 PM PDT 31.00 559 0 Normal
10/16/2026 03 PM PDT 31.00 559 0 Normal
10/16/2026 04 PM PDT 31.00 559 0 Normal
10/16/2026 05 PM PDT 31.00 559 0 Normal
10/16/2026 06 PM PDT 31.00 559 0 Normal
10/16/2026 07 PM PDT 31.00 559 0 Normal
10/16/2026 08 PM PDT 31.00 559 0 Normal
10/16/2026 09 PM PDT 31.00 559 0 Normal
10/16/2026 10 PM PDT 31.00 559 0 Normal
10/16/2026 11 PM PDT 31.00 559 0 Normal
10/17/2026 12 AM PDT 31.01 561 + Normal
10/17/2026 01 AM PDT 31.01 561 0 Normal
10/17/2026 02 AM PDT 31.01 561 0 Normal
10/17/2026 03 AM PDT 31.01 561 0 Normal
10/17/2026 04 AM PDT 31.01 561 0 Normal
10/17/2026 05 AM PDT 31.01 561 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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