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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: | Sep 12 2026 at 7:43 AM PDT | Next Issuance: | Sep 13 2026 at 9:00 AM PDT
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| 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: 09/12/2026 at 07:43 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 09/07/2026 at 12:00 PM PDT
# Maximum Observed Stage: 30.74 Feet
# Maximum Observed Flow: 487 cfs
#
# Earliest Date & Time of Maximum Forecast: 09/16/2026 at 10:00 PM PDT
# Maximum Forecast Stage: 30.37 Feet
# Maximum Forecast Flow: 393 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
09/07/2026 07 AM PDT 30.71 479 Normal
09/07/2026 08 AM PDT 30.72 482 + Normal
09/07/2026 09 AM PDT 30.73 485 + Normal
09/07/2026 10 AM PDT 30.74 487 + Normal
09/07/2026 11 AM PDT 30.74 487 0 Normal
09/07/2026 12 PM PDT 30.74 487 0 Normal
09/07/2026 01 PM PDT 30.73 485 - Normal
09/07/2026 02 PM PDT 30.71 479 - Normal
09/07/2026 03 PM PDT 30.67 469 - Normal
09/07/2026 04 PM PDT 30.66 466 - Normal
09/07/2026 05 PM PDT 30.65 464 - Normal
09/07/2026 06 PM PDT 30.61 453 - Normal
09/07/2026 07 PM PDT 30.60 451 - Normal
09/07/2026 08 PM PDT 30.58 445 - Normal
09/07/2026 09 PM PDT 30.57 443 - Normal
09/07/2026 10 PM PDT 30.56 440 - Normal
09/07/2026 11 PM PDT 30.55 438 - Normal
09/08/2026 12 AM PDT 30.53 433 - Normal
09/08/2026 01 AM PDT 30.52 430 - Normal
09/08/2026 02 AM PDT 30.51 428 - Normal
09/08/2026 03 AM PDT 30.50 425 - Normal
09/08/2026 04 AM PDT 30.49 423 - Normal
09/08/2026 05 AM PDT 30.48 420 - Normal
09/08/2026 06 AM PDT 30.44 410 - Normal
09/08/2026 07 AM PDT 30.40 400 - Normal
09/08/2026 08 AM PDT 30.39 398 - Normal
09/08/2026 09 AM PDT 30.38 395 - Normal
09/08/2026 10 AM PDT 30.36 390 - Normal
09/08/2026 11 AM PDT 30.34 385 - Normal
09/08/2026 12 PM PDT 30.35 388 + Normal
09/08/2026 01 PM PDT 30.32 380 - Normal
09/08/2026 02 PM PDT 30.28 371 - Normal
09/08/2026 03 PM PDT 30.27 368 - Normal
09/08/2026 04 PM PDT 30.26 366 - Normal
09/08/2026 05 PM PDT 30.21 354 - Normal
09/08/2026 06 PM PDT 30.22 356 + Normal
09/08/2026 07 PM PDT 30.21 354 - Normal
09/08/2026 08 PM PDT 30.19 349 - Normal
09/08/2026 09 PM PDT 30.20 352 + Normal
09/08/2026 10 PM PDT 30.19 349 - Normal
09/08/2026 11 PM PDT 30.19 349 0 Normal
09/09/2026 12 AM PDT 30.19 349 0 Normal
09/09/2026 01 AM PDT 30.19 349 0 Normal
09/09/2026 02 AM PDT 30.18 347 - Normal
09/09/2026 03 AM PDT 30.18 347 0 Normal
09/09/2026 04 AM PDT 30.18 347 0 Normal
09/09/2026 05 AM PDT 30.17 345 - Normal
09/09/2026 06 AM PDT 30.11 333 - Normal
09/09/2026 07 AM PDT 30.10 332 - Normal
09/09/2026 08 AM PDT 30.09 330 - Normal
09/09/2026 09 AM PDT 30.06 325 - Normal
09/09/2026 10 AM PDT 30.06 325 0 Normal
09/09/2026 11 AM PDT 30.07 327 + Normal
09/09/2026 12 PM PDT 30.10 332 + Normal
09/09/2026 01 PM PDT 30.12 335 + Normal
09/09/2026 02 PM PDT 30.14 338 + Normal
09/09/2026 03 PM PDT 30.17 345 + Normal
09/09/2026 04 PM PDT 30.19 349 + Normal
09/09/2026 05 PM PDT 30.19 349 0 Normal
09/09/2026 06 PM PDT 30.19 349 0 Normal
09/09/2026 07 PM PDT 30.19 349 0 Normal
09/09/2026 08 PM PDT 30.17 345 - Normal
09/09/2026 09 PM PDT 30.15 340 - Normal
09/09/2026 10 PM PDT 30.14 338 - Normal
09/09/2026 11 PM PDT 30.14 338 0 Normal
09/10/2026 12 AM PDT 30.14 338 0 Normal
09/10/2026 01 AM PDT 30.15 340 + Normal
09/10/2026 02 AM PDT 30.14 338 - Normal
09/10/2026 03 AM PDT 30.14 338 0 Normal
09/10/2026 04 AM PDT 30.14 338 0 Normal
09/10/2026 05 AM PDT 30.15 340 + Normal
09/10/2026 06 AM PDT 30.15 340 0 Normal
09/10/2026 07 AM PDT 30.11 333 - Normal
09/10/2026 08 AM PDT 30.06 325 - Normal
09/10/2026 09 AM PDT 30.07 327 + Normal
09/10/2026 10 AM PDT 30.07 327 0 Normal
09/10/2026 11 AM PDT 30.05 323 - Normal
09/10/2026 12 PM PDT 30.04 322 - Normal
09/10/2026 01 PM PDT 30.05 323 + Normal
09/10/2026 02 PM PDT 30.06 325 + Normal
09/10/2026 03 PM PDT 30.06 325 0 Normal
09/10/2026 04 PM PDT 30.07 327 + Normal
09/10/2026 05 PM PDT 30.07 327 0 Normal
09/10/2026 06 PM PDT 30.07 327 0 Normal
09/10/2026 07 PM PDT 30.09 330 + Normal
09/10/2026 08 PM PDT 30.11 333 + Normal
09/10/2026 09 PM PDT 30.11 333 0 Normal
09/10/2026 10 PM PDT 30.12 335 + Normal
09/10/2026 11 PM PDT 30.14 338 + Normal
09/11/2026 12 AM PDT 30.15 340 + Normal
09/11/2026 01 AM PDT 30.15 340 0 Normal
09/11/2026 02 AM PDT 30.16 342 + Normal
09/11/2026 03 AM PDT 30.17 345 + Normal
09/11/2026 04 AM PDT 30.17 345 0 Normal
09/11/2026 05 AM PDT 30.17 345 0 Normal
09/11/2026 06 AM PDT 30.15 340 - Normal
09/11/2026 07 AM PDT 30.15 340 0 Normal
09/11/2026 08 AM PDT 30.17 345 + Normal
09/11/2026 09 AM PDT 30.18 347 + Normal
09/11/2026 10 AM PDT 30.20 352 + Normal
09/11/2026 11 AM PDT 30.23 359 + Normal
09/11/2026 12 PM PDT 30.25 364 + Normal
09/11/2026 01 PM PDT 30.27 368 + Normal
09/11/2026 02 PM PDT 30.27 368 0 Normal
09/11/2026 03 PM PDT 30.27 368 0 Normal
09/11/2026 04 PM PDT 30.27 368 0 Normal
09/11/2026 05 PM PDT 30.28 371 + Normal
09/11/2026 06 PM PDT 30.29 373 + Normal
09/11/2026 07 PM PDT 30.28 371 - Normal
09/11/2026 08 PM PDT 30.25 364 - Normal
09/11/2026 09 PM PDT 30.25 364 0 Normal
09/11/2026 10 PM PDT 30.25 364 0 Normal
09/11/2026 11 PM PDT 30.24 361 - Normal
09/12/2026 12 AM PDT 30.25 364 + Normal
09/12/2026 01 AM PDT 30.25 364 0 Normal
09/12/2026 02 AM PDT 30.24 361 - Normal
09/12/2026 03 AM PDT 30.23 359 - Normal
09/12/2026 04 AM PDT 30.23 359 0 Normal
09/12/2026 05 AM PDT 30.23 359 0 Normal
09/12/2026 06 AM PDT 30.23 359 0 Normal
09/12/2026 07 AM PDT 30.23 359 0 Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
09/12/2026 08 AM PDT 30.23 359 Normal
09/12/2026 09 AM PDT 30.23 359 0 Normal
09/12/2026 10 AM PDT 30.23 359 0 Normal
09/12/2026 11 AM PDT 30.23 359 0 Normal
09/12/2026 12 PM PDT 30.23 359 0 Normal
09/12/2026 01 PM PDT 30.23 359 0 Normal
09/12/2026 02 PM PDT 30.22 356 - Normal
09/12/2026 03 PM PDT 30.22 356 0 Normal
09/12/2026 04 PM PDT 30.22 356 0 Normal
09/12/2026 05 PM PDT 30.22 356 0 Normal
09/12/2026 06 PM PDT 30.22 356 0 Normal
09/12/2026 07 PM PDT 30.22 356 0 Normal
09/12/2026 08 PM PDT 30.22 356 0 Normal
09/12/2026 09 PM PDT 30.22 356 0 Normal
09/12/2026 10 PM PDT 30.22 356 0 Normal
09/12/2026 11 PM PDT 30.22 356 0 Normal
09/13/2026 12 AM PDT 30.22 356 0 Normal
09/13/2026 01 AM PDT 30.22 356 0 Normal
09/13/2026 02 AM PDT 30.22 356 0 Normal
09/13/2026 03 AM PDT 30.23 359 + Normal
09/13/2026 04 AM PDT 30.23 359 0 Normal
09/13/2026 05 AM PDT 30.23 359 0 Normal
09/13/2026 06 AM PDT 30.23 359 0 Normal
09/13/2026 07 AM PDT 30.23 359 0 Normal
09/13/2026 08 AM PDT 30.23 359 0 Normal
09/13/2026 09 AM PDT 30.23 359 0 Normal
09/13/2026 10 AM PDT 30.23 359 0 Normal
09/13/2026 11 AM PDT 30.24 361 + Normal
09/13/2026 12 PM PDT 30.24 361 0 Normal
09/13/2026 01 PM PDT 30.24 361 0 Normal
09/13/2026 02 PM PDT 30.24 361 0 Normal
09/13/2026 03 PM PDT 30.25 364 + Normal
09/13/2026 04 PM PDT 30.25 364 0 Normal
09/13/2026 05 PM PDT 30.25 364 0 Normal
09/13/2026 06 PM PDT 30.25 364 0 Normal
09/13/2026 07 PM PDT 30.25 364 0 Normal
09/13/2026 08 PM PDT 30.26 366 + Normal
09/13/2026 09 PM PDT 30.26 366 0 Normal
09/13/2026 10 PM PDT 30.26 366 0 Normal
09/13/2026 11 PM PDT 30.27 368 + Normal
09/14/2026 12 AM PDT 30.27 368 0 Normal
09/14/2026 01 AM PDT 30.27 368 0 Normal
09/14/2026 02 AM PDT 30.27 368 0 Normal
09/14/2026 03 AM PDT 30.27 368 0 Normal
09/14/2026 04 AM PDT 30.27 368 0 Normal
09/14/2026 05 AM PDT 30.27 368 0 Normal
09/14/2026 06 AM PDT 30.28 371 + Normal
09/14/2026 07 AM PDT 30.28 371 0 Normal
09/14/2026 08 AM PDT 30.28 371 0 Normal
09/14/2026 09 AM PDT 30.28 371 0 Normal
09/14/2026 10 AM PDT 30.28 371 0 Normal
09/14/2026 11 AM PDT 30.29 373 + Normal
09/14/2026 12 PM PDT 30.29 373 0 Normal
09/14/2026 01 PM PDT 30.29 373 0 Normal
09/14/2026 02 PM PDT 30.29 373 0 Normal
09/14/2026 03 PM PDT 30.29 373 0 Normal
09/14/2026 04 PM PDT 30.29 373 0 Normal
09/14/2026 05 PM PDT 30.30 376 + Normal
09/14/2026 06 PM PDT 30.30 376 0 Normal
09/14/2026 07 PM PDT 30.30 376 0 Normal
09/14/2026 08 PM PDT 30.30 376 0 Normal
09/14/2026 09 PM PDT 30.30 376 0 Normal
09/14/2026 10 PM PDT 30.30 376 0 Normal
09/14/2026 11 PM PDT 30.30 376 0 Normal
09/15/2026 12 AM PDT 30.31 378 + Normal
09/15/2026 01 AM PDT 30.31 378 0 Normal
09/15/2026 02 AM PDT 30.31 378 0 Normal
09/15/2026 03 AM PDT 30.31 378 0 Normal
09/15/2026 04 AM PDT 30.31 378 0 Normal
09/15/2026 05 AM PDT 30.31 378 0 Normal
09/15/2026 06 AM PDT 30.32 380 + Normal
09/15/2026 07 AM PDT 30.32 380 0 Normal
09/15/2026 08 AM PDT 30.32 380 0 Normal
09/15/2026 09 AM PDT 30.32 380 0 Normal
09/15/2026 10 AM PDT 30.32 380 0 Normal
09/15/2026 11 AM PDT 30.32 380 0 Normal
09/15/2026 12 PM PDT 30.32 380 0 Normal
09/15/2026 01 PM PDT 30.32 380 0 Normal
09/15/2026 02 PM PDT 30.33 383 + Normal
09/15/2026 03 PM PDT 30.33 383 0 Normal
09/15/2026 04 PM PDT 30.33 383 0 Normal
09/15/2026 05 PM PDT 30.33 383 0 Normal
09/15/2026 06 PM PDT 30.33 383 0 Normal
09/15/2026 07 PM PDT 30.33 383 0 Normal
09/15/2026 08 PM PDT 30.33 383 0 Normal
09/15/2026 09 PM PDT 30.34 385 + Normal
09/15/2026 10 PM PDT 30.34 385 0 Normal
09/15/2026 11 PM PDT 30.34 385 0 Normal
09/16/2026 12 AM PDT 30.34 385 0 Normal
09/16/2026 01 AM PDT 30.34 385 0 Normal
09/16/2026 02 AM PDT 30.34 385 0 Normal
09/16/2026 03 AM PDT 30.34 385 0 Normal
09/16/2026 04 AM PDT 30.34 385 0 Normal
09/16/2026 05 AM PDT 30.34 385 0 Normal
09/16/2026 06 AM PDT 30.35 388 + Normal
09/16/2026 07 AM PDT 30.35 388 0 Normal
09/16/2026 08 AM PDT 30.35 388 0 Normal
09/16/2026 09 AM PDT 30.35 388 0 Normal
09/16/2026 10 AM PDT 30.35 388 0 Normal
09/16/2026 11 AM PDT 30.35 388 0 Normal
09/16/2026 12 PM PDT 30.35 388 0 Normal
09/16/2026 01 PM PDT 30.35 388 0 Normal
09/16/2026 02 PM PDT 30.36 390 + Normal
09/16/2026 03 PM PDT 30.36 390 0 Normal
09/16/2026 04 PM PDT 30.36 390 0 Normal
09/16/2026 05 PM PDT 30.36 390 0 Normal
09/16/2026 06 PM PDT 30.36 390 0 Normal
09/16/2026 07 PM PDT 30.36 390 0 Normal
09/16/2026 08 PM PDT 30.36 390 0 Normal
09/16/2026 09 PM PDT 30.36 390 0 Normal
09/16/2026 10 PM PDT 30.37 393 + Normal
09/16/2026 11 PM PDT 30.37 393 0 Normal
09/17/2026 12 AM PDT 30.37 393 0 Normal
09/17/2026 01 AM PDT 30.37 393 0 Normal
09/17/2026 02 AM PDT 30.37 393 0 Normal
09/17/2026 03 AM PDT 30.37 393 0 Normal
09/17/2026 04 AM PDT 30.37 393 0 Normal
09/17/2026 05 AM PDT 30.37 393 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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