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RUSSIAN RIVER - HACIENDA BRIDGE (RIOC1)
| Latitude: 38.51º N | Longitude: 122.93º W | Elevation: 20 Feet | | Forecast Type: Unofficial Location |
| Location: Sonoma County in California | Bulletin Group: Russian Napa | River Group: Russian Napa |
| Issuance Time: | May 04 2026 at 7:13 AM PDT | Next Issuance: | May 05 2026 at 9:00 AM PDT
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| Action/Monitor: 31.0 Feet | Minor Flood: 34.0 Feet | Moderate Flood: N/A | Major Flood: N/A |
# Tabular Observed and Forecast Hydrograph Information
#
# Location: Russian River - Hacienda Bridge (RIOC1)
#
# File Generation Time: 05/04/2026 at 07:14 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 04/29/2026 at 07:00 AM PDT
# Maximum Observed Stage: 3.91 Feet
# Maximum Observed Flow: 617 cfs
#
# Earliest Date & Time of Maximum Forecast: 05/05/2026 at 04:00 PM PDT
# Maximum Forecast Stage: 3.28 Feet
# Maximum Forecast Flow: 466 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
04/29/2026 07 AM PDT 3.91 617 Normal
04/29/2026 08 AM PDT 3.90 615 - Normal
04/29/2026 09 AM PDT 3.89 612 - Normal
04/29/2026 10 AM PDT 3.88 609 - Normal
04/29/2026 11 AM PDT 3.88 609 0 Normal
04/29/2026 12 PM PDT 3.87 607 - Normal
04/29/2026 01 PM PDT 3.86 604 - Normal
04/29/2026 02 PM PDT 3.86 604 0 Normal
04/29/2026 03 PM PDT 3.85 602 - Normal
04/29/2026 04 PM PDT 3.85 602 0 Normal
04/29/2026 05 PM PDT 3.83 597 - Normal
04/29/2026 06 PM PDT 3.82 594 - Normal
04/29/2026 07 PM PDT 3.81 592 - Normal
04/29/2026 08 PM PDT 3.81 592 0 Normal
04/29/2026 09 PM PDT 3.80 589 - Normal
04/29/2026 10 PM PDT 3.79 586 - Normal
04/29/2026 11 PM PDT 3.78 584 - Normal
04/30/2026 12 AM PDT 3.76 579 - Normal
04/30/2026 01 AM PDT 3.76 579 0 Normal
04/30/2026 02 AM PDT 3.76 579 0 Normal
04/30/2026 03 AM PDT 3.74 574 - Normal
04/30/2026 04 AM PDT 3.74 574 0 Normal
04/30/2026 05 AM PDT 3.73 571 - Normal
04/30/2026 06 AM PDT 3.73 571 0 Normal
04/30/2026 07 AM PDT 3.71 566 - Normal
04/30/2026 08 AM PDT 3.71 566 0 Normal
04/30/2026 09 AM PDT 3.70 564 - Normal
04/30/2026 10 AM PDT 3.69 562 - Normal
04/30/2026 11 AM PDT 3.69 562 0 Normal
04/30/2026 12 PM PDT 3.69 562 0 Normal
04/30/2026 01 PM PDT 3.68 559 - Normal
04/30/2026 02 PM PDT 3.68 559 0 Normal
04/30/2026 03 PM PDT 3.68 559 0 Normal
04/30/2026 04 PM PDT 3.67 557 - Normal
04/30/2026 05 PM PDT 3.66 554 - Normal
04/30/2026 06 PM PDT 3.66 554 0 Normal
04/30/2026 07 PM PDT 3.66 554 0 Normal
04/30/2026 08 PM PDT 3.64 549 - Normal
04/30/2026 09 PM PDT 3.63 547 - Normal
04/30/2026 10 PM PDT 3.63 547 0 Normal
04/30/2026 11 PM PDT 3.61 542 - Normal
05/01/2026 12 AM PDT 3.61 542 0 Normal
05/01/2026 01 AM PDT 3.60 540 - Normal
05/01/2026 02 AM PDT 3.60 540 0 Normal
05/01/2026 03 AM PDT 3.58 535 - Normal
05/01/2026 04 AM PDT 3.58 535 0 Normal
05/01/2026 05 AM PDT 3.58 535 0 Normal
05/01/2026 06 AM PDT 3.57 532 - Normal
05/01/2026 07 AM PDT 3.56 530 - Normal
05/01/2026 08 AM PDT 3.56 530 0 Normal
05/01/2026 09 AM PDT 3.56 530 0 Normal
05/01/2026 10 AM PDT 3.55 528 - Normal
05/01/2026 11 AM PDT 3.55 528 0 Normal
05/01/2026 12 PM PDT 3.54 525 - Normal
05/01/2026 01 PM PDT 3.54 525 0 Normal
05/01/2026 02 PM PDT 3.53 523 - Normal
05/01/2026 03 PM PDT 3.53 523 0 Normal
05/01/2026 04 PM PDT 3.53 523 0 Normal
05/01/2026 05 PM PDT 3.52 521 - Normal
05/01/2026 06 PM PDT 3.52 521 0 Normal
05/01/2026 07 PM PDT 3.52 521 0 Normal
05/01/2026 08 PM PDT 3.51 518 - Normal
05/01/2026 09 PM PDT 3.50 516 - Normal
05/01/2026 10 PM PDT 3.50 516 0 Normal
05/01/2026 11 PM PDT 3.49 514 - Normal
05/02/2026 12 AM PDT 3.48 511 - Normal
05/02/2026 01 AM PDT 3.48 511 0 Normal
05/02/2026 02 AM PDT 3.47 509 - Normal
05/02/2026 03 AM PDT 3.46 507 - Normal
05/02/2026 04 AM PDT 3.46 507 0 Normal
05/02/2026 05 AM PDT 3.45 504 - Normal
05/02/2026 06 AM PDT 3.45 504 0 Normal
05/02/2026 07 AM PDT 3.45 504 0 Normal
05/02/2026 08 AM PDT 3.45 504 0 Normal
05/02/2026 09 AM PDT 3.44 502 - Normal
05/02/2026 10 AM PDT 3.44 502 0 Normal
05/02/2026 11 AM PDT 3.44 502 0 Normal
05/02/2026 12 PM PDT 3.44 502 0 Normal
05/02/2026 01 PM PDT 3.44 502 0 Normal
05/02/2026 02 PM PDT 3.42 497 - Normal
05/02/2026 03 PM PDT 3.42 497 0 Normal
05/02/2026 04 PM PDT 3.42 497 0 Normal
05/02/2026 05 PM PDT 3.42 497 0 Normal
05/02/2026 06 PM PDT 3.41 495 - Normal
05/02/2026 07 PM PDT 3.41 495 0 Normal
05/02/2026 08 PM PDT 3.41 495 0 Normal
05/02/2026 09 PM PDT 3.40 493 - Normal
05/02/2026 10 PM PDT 3.40 493 0 Normal
05/02/2026 11 PM PDT 3.40 493 0 Normal
05/03/2026 12 AM PDT 3.39 491 - Normal
05/03/2026 01 AM PDT 3.39 491 0 Normal
05/03/2026 02 AM PDT 3.38 488 - Normal
05/03/2026 03 AM PDT 3.38 488 0 Normal
05/03/2026 04 AM PDT 3.38 488 0 Normal
05/03/2026 05 AM PDT 3.38 488 0 Normal
05/03/2026 06 AM PDT 3.37 486 - Normal
05/03/2026 07 AM PDT 3.37 486 0 Normal
05/03/2026 08 AM PDT 3.36 484 - Normal
05/03/2026 09 AM PDT 3.36 484 0 Normal
05/03/2026 10 AM PDT 3.36 484 0 Normal
05/03/2026 11 AM PDT 3.35 482 - Normal
05/03/2026 12 PM PDT 3.36 484 + Normal
05/03/2026 01 PM PDT 3.35 482 - Normal
05/03/2026 02 PM PDT 3.35 482 0 Normal
05/03/2026 03 PM PDT 3.35 482 0 Normal
05/03/2026 04 PM PDT 3.35 482 0 Normal
05/03/2026 05 PM PDT 3.33 477 - Normal
05/03/2026 06 PM PDT 3.33 477 0 Normal
05/03/2026 07 PM PDT 3.33 477 0 Normal
05/03/2026 08 PM PDT 3.33 477 0 Normal
05/03/2026 09 PM PDT 3.32 475 - Normal
05/03/2026 10 PM PDT 3.32 475 0 Normal
05/03/2026 11 PM PDT 3.31 473 - Normal
05/04/2026 12 AM PDT 3.30 470 - Normal
05/04/2026 01 AM PDT 3.31 473 + Normal
05/04/2026 02 AM PDT 3.30 470 - Normal
05/04/2026 03 AM PDT 3.29 468 - Normal
05/04/2026 04 AM PDT 3.29 468 0 Normal
05/04/2026 05 AM PDT 3.28 466 - Normal
05/04/2026 06 AM PDT 3.27 464 - Normal
05/04/2026 07 AM PDT 3.27 464 0 Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
05/04/2026 08 AM PDT 3.27 464 Normal
05/04/2026 09 AM PDT 3.26 462 - Normal
05/04/2026 10 AM PDT 3.26 462 0 Normal
05/04/2026 11 AM PDT 3.25 459 - Normal
05/04/2026 12 PM PDT 3.25 459 0 Normal
05/04/2026 01 PM PDT 3.25 459 0 Normal
05/04/2026 02 PM PDT 3.24 457 - Normal
05/04/2026 03 PM PDT 3.24 457 0 Normal
05/04/2026 04 PM PDT 3.24 457 0 Normal
05/04/2026 05 PM PDT 3.23 455 - Normal
05/04/2026 06 PM PDT 3.22 453 - Normal
05/04/2026 07 PM PDT 3.22 453 0 Normal
05/04/2026 08 PM PDT 3.22 453 0 Normal
05/04/2026 09 PM PDT 3.21 451 - Normal
05/04/2026 10 PM PDT 3.21 451 0 Normal
05/04/2026 11 PM PDT 3.21 451 0 Normal
05/05/2026 12 AM PDT 3.21 451 0 Normal
05/05/2026 01 AM PDT 3.21 451 0 Normal
05/05/2026 02 AM PDT 3.21 451 0 Normal
05/05/2026 03 AM PDT 3.21 451 0 Normal
05/05/2026 04 AM PDT 3.21 451 0 Normal
05/05/2026 05 AM PDT 3.21 451 0 Normal
05/05/2026 06 AM PDT 3.22 453 + Normal
05/05/2026 07 AM PDT 3.22 453 0 Normal
05/05/2026 08 AM PDT 3.23 455 + Normal
05/05/2026 09 AM PDT 3.23 455 0 Normal
05/05/2026 10 AM PDT 3.24 457 + Normal
05/05/2026 11 AM PDT 3.25 459 + Normal
05/05/2026 12 PM PDT 3.26 462 + Normal
05/05/2026 01 PM PDT 3.26 462 0 Normal
05/05/2026 02 PM PDT 3.27 464 + Normal
05/05/2026 03 PM PDT 3.27 464 0 Normal
05/05/2026 04 PM PDT 3.28 466 + Normal
05/05/2026 05 PM PDT 3.28 466 0 Normal
05/05/2026 06 PM PDT 3.27 464 - Normal
05/05/2026 07 PM PDT 3.27 464 0 Normal
05/05/2026 08 PM PDT 3.27 464 0 Normal
05/05/2026 09 PM PDT 3.27 464 0 Normal
05/05/2026 10 PM PDT 3.27 464 0 Normal
05/05/2026 11 PM PDT 3.27 464 0 Normal
05/06/2026 12 AM PDT 3.26 462 - Normal
05/06/2026 01 AM PDT 3.26 462 0 Normal
05/06/2026 02 AM PDT 3.25 459 - Normal
05/06/2026 03 AM PDT 3.25 459 0 Normal
05/06/2026 04 AM PDT 3.24 457 - Normal
05/06/2026 05 AM PDT 3.23 455 - Normal
05/06/2026 06 AM PDT 3.23 455 0 Normal
05/06/2026 07 AM PDT 3.22 453 - Normal
05/06/2026 08 AM PDT 3.22 453 0 Normal
05/06/2026 09 AM PDT 3.21 451 - Normal
05/06/2026 10 AM PDT 3.21 451 0 Normal
05/06/2026 11 AM PDT 3.20 449 - Normal
05/06/2026 12 PM PDT 3.19 446 - Normal
05/06/2026 01 PM PDT 3.19 446 0 Normal
05/06/2026 02 PM PDT 3.19 446 0 Normal
05/06/2026 03 PM PDT 3.18 444 - Normal
05/06/2026 04 PM PDT 3.18 444 0 Normal
05/06/2026 05 PM PDT 3.17 442 - Normal
05/06/2026 06 PM PDT 3.16 440 - Normal
05/06/2026 07 PM PDT 3.16 440 0 Normal
05/06/2026 08 PM PDT 3.15 438 - Normal
05/06/2026 09 PM PDT 3.15 438 0 Normal
05/06/2026 10 PM PDT 3.15 438 0 Normal
05/06/2026 11 PM PDT 3.14 436 - Normal
05/07/2026 12 AM PDT 3.14 436 0 Normal
05/07/2026 01 AM PDT 3.13 434 - Normal
05/07/2026 02 AM PDT 3.13 434 0 Normal
05/07/2026 03 AM PDT 3.13 434 0 Normal
05/07/2026 04 AM PDT 3.12 432 - Normal
05/07/2026 05 AM PDT 3.12 432 0 Normal
05/07/2026 06 AM PDT 3.12 432 0 Normal
05/07/2026 07 AM PDT 3.11 430 - Normal
05/07/2026 08 AM PDT 3.11 430 0 Normal
05/07/2026 09 AM PDT 3.10 427 - Normal
05/07/2026 10 AM PDT 3.10 427 0 Normal
05/07/2026 11 AM PDT 3.10 427 0 Normal
05/07/2026 12 PM PDT 3.09 425 - Normal
05/07/2026 01 PM PDT 3.09 425 0 Normal
05/07/2026 02 PM PDT 3.08 423 - Normal
05/07/2026 03 PM PDT 3.08 423 0 Normal
05/07/2026 04 PM PDT 3.08 423 0 Normal
05/07/2026 05 PM PDT 3.07 421 - Normal
05/07/2026 06 PM PDT 3.06 419 - Normal
05/07/2026 07 PM PDT 3.06 419 0 Normal
05/07/2026 08 PM PDT 3.05 417 - Normal
05/07/2026 09 PM PDT 3.05 417 0 Normal
05/07/2026 10 PM PDT 3.05 417 0 Normal
05/07/2026 11 PM PDT 3.04 415 - Normal
05/08/2026 12 AM PDT 3.04 415 0 Normal
05/08/2026 01 AM PDT 3.04 415 0 Normal
05/08/2026 02 AM PDT 3.03 413 - Normal
05/08/2026 03 AM PDT 3.03 413 0 Normal
05/08/2026 04 AM PDT 3.03 413 0 Normal
05/08/2026 05 AM PDT 3.02 411 - Normal
05/08/2026 06 AM PDT 3.02 411 0 Normal
05/08/2026 07 AM PDT 3.02 411 0 Normal
05/08/2026 08 AM PDT 3.01 409 - Normal
05/08/2026 09 AM PDT 3.01 409 0 Normal
05/08/2026 10 AM PDT 3.01 409 0 Normal
05/08/2026 11 AM PDT 3.00 407 - Normal
05/08/2026 12 PM PDT 3.00 407 0 Normal
05/08/2026 01 PM PDT 3.00 407 0 Normal
05/08/2026 02 PM PDT 2.99 405 - Normal
05/08/2026 03 PM PDT 2.99 405 0 Normal
05/08/2026 04 PM PDT 2.99 405 0 Normal
05/08/2026 05 PM PDT 2.98 403 - Normal
05/08/2026 06 PM PDT 2.97 401 - Normal
05/08/2026 07 PM PDT 2.97 401 0 Normal
05/08/2026 08 PM PDT 2.97 401 0 Normal
05/08/2026 09 PM PDT 2.96 399 - Normal
05/08/2026 10 PM PDT 2.96 399 0 Normal
05/08/2026 11 PM PDT 2.96 399 0 Normal
05/09/2026 12 AM PDT 2.96 399 0 Normal
05/09/2026 01 AM PDT 2.95 397 - Normal
05/09/2026 02 AM PDT 2.95 397 0 Normal
05/09/2026 03 AM PDT 2.95 397 0 Normal
05/09/2026 04 AM PDT 2.94 395 - Normal
05/09/2026 05 AM PDT 2.94 395 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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