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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 19 2026 at 8:24 AM PDT | Next Issuance: | May 20 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: 05/19/2026 at 08:24 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 05/15/2026 at 11:00 AM PDT
# Maximum Observed Stage: 31.51 Feet
# Maximum Observed Flow: 485 cfs
#
# Earliest Date & Time of Maximum Forecast: 05/19/2026 at 09:00 AM PDT
# Maximum Forecast Stage: 31.23 Feet
# Maximum Forecast Flow: 412 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
05/14/2026 08 AM PDT 31.48 477 Normal
05/14/2026 09 AM PDT 31.48 477 0 Normal
05/14/2026 10 AM PDT 31.50 482 + Normal
05/14/2026 11 AM PDT 31.48 477 - Normal
05/14/2026 12 PM PDT 31.49 479 + Normal
05/14/2026 01 PM PDT 31.50 482 + Normal
05/14/2026 02 PM PDT 31.48 477 - Normal
05/14/2026 03 PM PDT 31.48 477 0 Normal
05/14/2026 04 PM PDT 31.48 477 0 Normal
05/14/2026 05 PM PDT 31.48 477 0 Normal
05/14/2026 06 PM PDT 31.51 485 + Normal
05/14/2026 07 PM PDT 31.48 477 - Normal
05/14/2026 08 PM PDT 31.49 479 + Normal
05/14/2026 09 PM PDT 31.50 482 + Normal
05/14/2026 10 PM PDT 31.49 479 - Normal
05/14/2026 11 PM PDT 31.50 482 + Normal
05/15/2026 12 AM PDT 31.50 482 0 Normal
05/15/2026 01 AM PDT 31.50 482 0 Normal
05/15/2026 02 AM PDT 31.50 482 0 Normal
05/15/2026 03 AM PDT 31.50 482 0 Normal
05/15/2026 04 AM PDT 31.50 482 0 Normal
05/15/2026 05 AM PDT 31.49 479 - Normal
05/15/2026 06 AM PDT 31.49 479 0 Normal
05/15/2026 07 AM PDT 31.49 479 0 Normal
05/15/2026 08 AM PDT 31.50 482 + Normal
05/15/2026 09 AM PDT 31.50 482 0 Normal
05/15/2026 10 AM PDT 31.51 485 + Normal
05/15/2026 11 AM PDT 31.51 485 0 Normal
05/15/2026 12 PM PDT 31.47 474 - Normal
05/15/2026 01 PM PDT 31.47 474 0 Normal
05/15/2026 02 PM PDT 31.43 464 - Normal
05/15/2026 03 PM PDT 31.44 466 + Normal
05/15/2026 04 PM PDT 31.42 461 - Normal
05/15/2026 05 PM PDT 31.41 458 - Normal
05/15/2026 06 PM PDT 31.42 461 + Normal
05/15/2026 07 PM PDT 31.41 458 - Normal
05/15/2026 08 PM PDT 31.41 458 0 Normal
05/15/2026 09 PM PDT 31.42 461 + Normal
05/15/2026 10 PM PDT 31.43 464 + Normal
05/15/2026 11 PM PDT 31.42 461 - Normal
05/16/2026 12 AM PDT 31.41 458 - Normal
05/16/2026 01 AM PDT 31.41 458 0 Normal
05/16/2026 02 AM PDT 31.41 458 0 Normal
05/16/2026 03 AM PDT 31.41 458 0 Normal
05/16/2026 04 AM PDT 31.41 458 0 Normal
05/16/2026 05 AM PDT 31.41 458 0 Normal
05/16/2026 06 AM PDT 31.41 458 0 Normal
05/16/2026 07 AM PDT 31.40 456 - Normal
05/16/2026 08 AM PDT 31.37 448 - Normal
05/16/2026 09 AM PDT 31.38 451 + Normal
05/16/2026 10 AM PDT 31.40 456 + Normal
05/16/2026 11 AM PDT 31.41 458 + Normal
05/16/2026 12 PM PDT 31.43 464 + Normal
05/16/2026 01 PM PDT 31.46 472 + Normal
05/16/2026 02 PM PDT 31.47 474 + Normal
05/16/2026 03 PM PDT 31.48 477 + Normal
05/16/2026 04 PM PDT 31.49 479 + Normal
05/16/2026 05 PM PDT 31.46 472 - Normal
05/16/2026 06 PM PDT 31.46 472 0 Normal
05/16/2026 07 PM PDT 31.46 472 0 Normal
05/16/2026 08 PM PDT 31.45 469 - Normal
05/16/2026 09 PM PDT 31.44 466 - Normal
05/16/2026 10 PM PDT 31.44 466 0 Normal
05/16/2026 11 PM PDT 31.42 461 - Normal
05/17/2026 12 AM PDT 31.40 456 - Normal
05/17/2026 01 AM PDT 31.41 458 + Normal
05/17/2026 02 AM PDT 31.39 453 - Normal
05/17/2026 03 AM PDT 31.39 453 0 Normal
05/17/2026 04 AM PDT 31.37 448 - Normal
05/17/2026 05 AM PDT 31.37 448 0 Normal
05/17/2026 06 AM PDT 31.39 453 + Normal
05/17/2026 07 AM PDT 31.40 456 + Normal
05/17/2026 08 AM PDT 31.42 461 + Normal
05/17/2026 09 AM PDT 31.42 461 0 Normal
05/17/2026 10 AM PDT 31.43 464 + Normal
05/17/2026 11 AM PDT 31.45 469 + Normal
05/17/2026 12 PM PDT 31.45 469 0 Normal
05/17/2026 01 PM PDT 31.46 472 + Normal
05/17/2026 02 PM PDT 31.46 472 0 Normal
05/17/2026 03 PM PDT 31.45 469 - Normal
05/17/2026 04 PM PDT 31.47 474 + Normal
05/17/2026 05 PM PDT 31.46 472 - Normal
05/17/2026 06 PM PDT 31.45 469 - Normal
05/17/2026 07 PM PDT 31.44 466 - Normal
05/17/2026 08 PM PDT 31.44 466 0 Normal
05/17/2026 09 PM PDT 31.45 469 + Normal
05/17/2026 10 PM PDT 31.44 466 - Normal
05/17/2026 11 PM PDT 31.43 464 - Normal
05/18/2026 12 AM PDT 31.44 466 + Normal
05/18/2026 01 AM PDT 31.44 466 0 Normal
05/18/2026 02 AM PDT 31.43 464 - Normal
05/18/2026 03 AM PDT 31.43 464 0 Normal
05/18/2026 04 AM PDT 31.41 458 - Normal
05/18/2026 05 AM PDT 31.42 461 + Normal
05/18/2026 06 AM PDT 31.41 458 - Normal
05/18/2026 07 AM PDT 31.40 456 - Normal
05/18/2026 08 AM PDT 31.41 458 + Normal
05/18/2026 09 AM PDT 31.43 464 + Normal
05/18/2026 10 AM PDT 31.43 464 0 Normal
05/18/2026 11 AM PDT 31.44 466 + Normal
05/18/2026 12 PM PDT 31.42 461 - Normal
05/18/2026 01 PM PDT 31.42 461 0 Normal
05/18/2026 02 PM PDT 31.40 456 - Normal
05/18/2026 03 PM PDT 31.40 456 0 Normal
05/18/2026 04 PM PDT 31.38 451 - Normal
05/18/2026 05 PM PDT 31.36 445 - Normal
05/18/2026 06 PM PDT 31.36 445 0 Normal
05/18/2026 07 PM PDT 31.35 443 - Normal
05/18/2026 08 PM PDT 31.35 443 0 Normal
05/18/2026 09 PM PDT 31.34 440 - Normal
05/18/2026 10 PM PDT 31.32 435 - Normal
05/18/2026 11 PM PDT 31.31 433 - Normal
05/19/2026 12 AM PDT 31.31 433 0 Normal
05/19/2026 01 AM PDT 31.29 428 - Normal
05/19/2026 02 AM PDT 31.29 428 0 Normal
05/19/2026 03 AM PDT 31.27 423 - Normal
05/19/2026 04 AM PDT 31.25 417 - Normal
05/19/2026 05 AM PDT 31.24 415 - Normal
05/19/2026 06 AM PDT 31.22 410 - Normal
05/19/2026 07 AM PDT 31.23 412 + Normal
05/19/2026 08 AM PDT 31.23 412 0 Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
05/19/2026 09 AM PDT 31.23 412 Normal
05/19/2026 10 AM PDT 31.23 412 0 Normal
05/19/2026 11 AM PDT 31.23 412 0 Normal
05/19/2026 12 PM PDT 31.23 412 0 Normal
05/19/2026 01 PM PDT 31.23 412 0 Normal
05/19/2026 02 PM PDT 31.23 412 0 Normal
05/19/2026 03 PM PDT 31.23 412 0 Normal
05/19/2026 04 PM PDT 31.22 410 - Normal
05/19/2026 05 PM PDT 31.22 410 0 Normal
05/19/2026 06 PM PDT 31.22 410 0 Normal
05/19/2026 07 PM PDT 31.21 407 - Normal
05/19/2026 08 PM PDT 31.21 407 0 Normal
05/19/2026 09 PM PDT 31.21 407 0 Normal
05/19/2026 10 PM PDT 31.20 405 - Normal
05/19/2026 11 PM PDT 31.20 405 0 Normal
05/20/2026 12 AM PDT 31.20 405 0 Normal
05/20/2026 01 AM PDT 31.19 402 - Normal
05/20/2026 02 AM PDT 31.19 402 0 Normal
05/20/2026 03 AM PDT 31.18 400 - Normal
05/20/2026 04 AM PDT 31.18 400 0 Normal
05/20/2026 05 AM PDT 31.18 400 0 Normal
05/20/2026 06 AM PDT 31.17 398 - Normal
05/20/2026 07 AM PDT 31.17 398 0 Normal
05/20/2026 08 AM PDT 31.16 395 - Normal
05/20/2026 09 AM PDT 31.16 395 0 Normal
05/20/2026 10 AM PDT 31.15 393 - Normal
05/20/2026 11 AM PDT 31.15 393 0 Normal
05/20/2026 12 PM PDT 31.14 390 - Normal
05/20/2026 01 PM PDT 31.14 390 0 Normal
05/20/2026 02 PM PDT 31.14 390 0 Normal
05/20/2026 03 PM PDT 31.14 390 0 Normal
05/20/2026 04 PM PDT 31.13 388 - Normal
05/20/2026 05 PM PDT 31.13 388 0 Normal
05/20/2026 06 PM PDT 31.13 388 0 Normal
05/20/2026 07 PM PDT 31.12 385 - Normal
05/20/2026 08 PM PDT 31.12 385 0 Normal
05/20/2026 09 PM PDT 31.12 385 0 Normal
05/20/2026 10 PM PDT 31.12 385 0 Normal
05/20/2026 11 PM PDT 31.11 383 - Normal
05/21/2026 12 AM PDT 31.11 383 0 Normal
05/21/2026 01 AM PDT 31.11 383 0 Normal
05/21/2026 02 AM PDT 31.11 383 0 Normal
05/21/2026 03 AM PDT 31.11 383 0 Normal
05/21/2026 04 AM PDT 31.11 383 0 Normal
05/21/2026 05 AM PDT 31.10 380 - Normal
05/21/2026 06 AM PDT 31.10 380 0 Normal
05/21/2026 07 AM PDT 31.10 380 0 Normal
05/21/2026 08 AM PDT 31.10 380 0 Normal
05/21/2026 09 AM PDT 31.10 380 0 Normal
05/21/2026 10 AM PDT 31.09 378 - Normal
05/21/2026 11 AM PDT 31.09 378 0 Normal
05/21/2026 12 PM PDT 31.09 378 0 Normal
05/21/2026 01 PM PDT 31.09 378 0 Normal
05/21/2026 02 PM PDT 31.09 378 0 Normal
05/21/2026 03 PM PDT 31.08 376 - Normal
05/21/2026 04 PM PDT 31.08 376 0 Normal
05/21/2026 05 PM PDT 31.08 376 0 Normal
05/21/2026 06 PM PDT 31.08 376 0 Normal
05/21/2026 07 PM PDT 31.08 376 0 Normal
05/21/2026 08 PM PDT 31.08 376 0 Normal
05/21/2026 09 PM PDT 31.07 373 - Normal
05/21/2026 10 PM PDT 31.07 373 0 Normal
05/21/2026 11 PM PDT 31.07 373 0 Normal
05/22/2026 12 AM PDT 31.07 373 0 Normal
05/22/2026 01 AM PDT 31.07 373 0 Normal
05/22/2026 02 AM PDT 31.07 373 0 Normal
05/22/2026 03 AM PDT 31.07 373 0 Normal
05/22/2026 04 AM PDT 31.07 373 0 Normal
05/22/2026 05 AM PDT 31.07 373 0 Normal
05/22/2026 06 AM PDT 31.06 371 - Normal
05/22/2026 07 AM PDT 31.06 371 0 Normal
05/22/2026 08 AM PDT 31.06 371 0 Normal
05/22/2026 09 AM PDT 31.06 371 0 Normal
05/22/2026 10 AM PDT 31.06 371 0 Normal
05/22/2026 11 AM PDT 31.05 368 - Normal
05/22/2026 12 PM PDT 31.05 368 0 Normal
05/22/2026 01 PM PDT 31.05 368 0 Normal
05/22/2026 02 PM PDT 31.05 368 0 Normal
05/22/2026 03 PM PDT 31.05 368 0 Normal
05/22/2026 04 PM PDT 31.05 368 0 Normal
05/22/2026 05 PM PDT 31.04 366 - Normal
05/22/2026 06 PM PDT 31.04 366 0 Normal
05/22/2026 07 PM PDT 31.04 366 0 Normal
05/22/2026 08 PM PDT 31.04 366 0 Normal
05/22/2026 09 PM PDT 31.04 366 0 Normal
05/22/2026 10 PM PDT 31.04 366 0 Normal
05/22/2026 11 PM PDT 31.03 364 - Normal
05/23/2026 12 AM PDT 31.03 364 0 Normal
05/23/2026 01 AM PDT 31.03 364 0 Normal
05/23/2026 02 AM PDT 31.03 364 0 Normal
05/23/2026 03 AM PDT 31.03 364 0 Normal
05/23/2026 04 AM PDT 31.03 364 0 Normal
05/23/2026 05 AM PDT 31.02 361 - Normal
05/23/2026 06 AM PDT 31.02 361 0 Normal
05/23/2026 07 AM PDT 31.02 361 0 Normal
05/23/2026 08 AM PDT 31.02 361 0 Normal
05/23/2026 09 AM PDT 31.02 361 0 Normal
05/23/2026 10 AM PDT 31.02 361 0 Normal
05/23/2026 11 AM PDT 31.02 361 0 Normal
05/23/2026 12 PM PDT 31.01 359 - Normal
05/23/2026 01 PM PDT 31.01 359 0 Normal
05/23/2026 02 PM PDT 31.01 359 0 Normal
05/23/2026 03 PM PDT 31.01 359 0 Normal
05/23/2026 04 PM PDT 31.01 359 0 Normal
05/23/2026 05 PM PDT 31.00 356 - Normal
05/23/2026 06 PM PDT 31.00 356 0 Normal
05/23/2026 07 PM PDT 31.00 356 0 Normal
05/23/2026 08 PM PDT 31.00 356 0 Normal
05/23/2026 09 PM PDT 31.00 356 0 Normal
05/23/2026 10 PM PDT 31.00 356 0 Normal
05/23/2026 11 PM PDT 31.00 356 0 Normal
05/24/2026 12 AM PDT 30.99 354 - Normal
05/24/2026 01 AM PDT 30.99 354 0 Normal
05/24/2026 02 AM PDT 30.99 354 0 Normal
05/24/2026 03 AM PDT 30.99 354 0 Normal
05/24/2026 04 AM PDT 30.99 354 0 Normal
05/24/2026 05 AM PDT 30.99 354 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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