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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 10 2026 at 7:31 AM PDT | Next Issuance: | May 11 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: 05/10/2026 at 07:32 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 05/05/2026 at 07:00 PM PDT
# Maximum Observed Stage: 3.38 Feet
# Maximum Observed Flow: 505 cfs
#
# Earliest Date & Time of Maximum Forecast: 05/10/2026 at 08:00 AM PDT
# Maximum Forecast Stage: 2.91 Feet
# Maximum Forecast Flow: 395 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
05/05/2026 07 AM PDT 3.29 483 Normal
05/05/2026 08 AM PDT 3.30 486 + Normal
05/05/2026 09 AM PDT 3.31 488 + Normal
05/05/2026 10 AM PDT 3.32 491 + Normal
05/05/2026 11 AM PDT 3.32 491 0 Normal
05/05/2026 12 PM PDT 3.34 496 + Normal
05/05/2026 01 PM PDT 3.34 496 0 Normal
05/05/2026 02 PM PDT 3.35 498 + Normal
05/05/2026 03 PM PDT 3.35 498 0 Normal
05/05/2026 04 PM PDT 3.36 500 + Normal
05/05/2026 05 PM PDT 3.37 502 + Normal
05/05/2026 06 PM PDT 3.37 502 0 Normal
05/05/2026 07 PM PDT 3.38 505 + Normal
05/05/2026 08 PM PDT 3.37 502 - Normal
05/05/2026 09 PM PDT 3.37 502 0 Normal
05/05/2026 10 PM PDT 3.37 502 0 Normal
05/05/2026 11 PM PDT 3.37 502 0 Normal
05/06/2026 12 AM PDT 3.36 500 - Normal
05/06/2026 01 AM PDT 3.35 498 - Normal
05/06/2026 02 AM PDT 3.35 498 0 Normal
05/06/2026 03 AM PDT 3.35 498 0 Normal
05/06/2026 04 AM PDT 3.33 493 - Normal
05/06/2026 05 AM PDT 3.33 493 0 Normal
05/06/2026 06 AM PDT 3.33 493 0 Normal
05/06/2026 07 AM PDT 3.32 491 - Normal
05/06/2026 08 AM PDT 3.32 491 0 Normal
05/06/2026 09 AM PDT 3.31 488 - Normal
05/06/2026 10 AM PDT 3.31 488 0 Normal
05/06/2026 11 AM PDT 3.30 486 - Normal
05/06/2026 12 PM PDT 3.29 483 - Normal
05/06/2026 01 PM PDT 3.29 483 0 Normal
05/06/2026 02 PM PDT 3.29 483 0 Normal
05/06/2026 03 PM PDT 3.28 481 - Normal
05/06/2026 04 PM PDT 3.27 478 - Normal
05/06/2026 05 PM PDT 3.27 478 0 Normal
05/06/2026 06 PM PDT 3.27 478 0 Normal
05/06/2026 07 PM PDT 3.25 474 - Normal
05/06/2026 08 PM PDT 3.25 474 0 Normal
05/06/2026 09 PM PDT 3.23 469 - Normal
05/06/2026 10 PM PDT 3.23 469 0 Normal
05/06/2026 11 PM PDT 3.22 466 - Normal
05/07/2026 12 AM PDT 3.21 464 - Normal
05/07/2026 01 AM PDT 3.21 464 0 Normal
05/07/2026 02 AM PDT 3.20 461 - Normal
05/07/2026 03 AM PDT 3.20 461 0 Normal
05/07/2026 04 AM PDT 3.19 459 - Normal
05/07/2026 05 AM PDT 3.18 457 - Normal
05/07/2026 06 AM PDT 3.18 457 0 Normal
05/07/2026 07 AM PDT 3.18 457 0 Normal
05/07/2026 08 AM PDT 3.17 454 - Normal
05/07/2026 09 AM PDT 3.17 454 0 Normal
05/07/2026 10 AM PDT 3.17 454 0 Normal
05/07/2026 11 AM PDT 3.17 454 0 Normal
05/07/2026 12 PM PDT 3.17 454 0 Normal
05/07/2026 01 PM PDT 3.15 450 - Normal
05/07/2026 02 PM PDT 3.15 450 0 Normal
05/07/2026 03 PM PDT 3.15 450 0 Normal
05/07/2026 04 PM PDT 3.15 450 0 Normal
05/07/2026 05 PM PDT 3.14 447 - Normal
05/07/2026 06 PM PDT 3.14 447 0 Normal
05/07/2026 07 PM PDT 3.14 447 0 Normal
05/07/2026 08 PM PDT 3.13 445 - Normal
05/07/2026 09 PM PDT 3.13 445 0 Normal
05/07/2026 10 PM PDT 3.12 443 - Normal
05/07/2026 11 PM PDT 3.11 440 - Normal
05/08/2026 12 AM PDT 3.11 440 0 Normal
05/08/2026 01 AM PDT 3.11 440 0 Normal
05/08/2026 02 AM PDT 3.10 438 - Normal
05/08/2026 03 AM PDT 3.10 438 0 Normal
05/08/2026 04 AM PDT 3.10 438 0 Normal
05/08/2026 05 AM PDT 3.09 436 - Normal
05/08/2026 06 AM PDT 3.09 436 0 Normal
05/08/2026 07 AM PDT 3.09 436 0 Normal
05/08/2026 08 AM PDT 3.08 433 - Normal
05/08/2026 09 AM PDT 3.09 436 + Normal
05/08/2026 10 AM PDT 3.08 433 - Normal
05/08/2026 11 AM PDT 3.08 433 0 Normal
05/08/2026 12 PM PDT 3.07 431 - Normal
05/08/2026 01 PM PDT 3.07 431 0 Normal
05/08/2026 02 PM PDT 3.06 429 - Normal
05/08/2026 03 PM PDT 3.06 429 0 Normal
05/08/2026 04 PM PDT 3.06 429 0 Normal
05/08/2026 05 PM PDT 3.05 427 - Normal
05/08/2026 06 PM PDT 3.05 427 0 Normal
05/08/2026 07 PM PDT 3.04 424 - Normal
05/08/2026 08 PM PDT 3.05 427 + Normal
05/08/2026 09 PM PDT 3.04 424 - Normal
05/08/2026 10 PM PDT 3.04 424 0 Normal
05/08/2026 11 PM PDT 3.04 424 0 Normal
05/09/2026 12 AM PDT 3.03 422 - Normal
05/09/2026 01 AM PDT 3.03 422 0 Normal
05/09/2026 02 AM PDT 3.02 420 - Normal
05/09/2026 03 AM PDT 3.02 420 0 Normal
05/09/2026 04 AM PDT 3.01 417 - Normal
05/09/2026 05 AM PDT 3.02 420 + Normal
05/09/2026 06 AM PDT 3.01 417 - Normal
05/09/2026 07 AM PDT 3.01 417 0 Normal
05/09/2026 08 AM PDT 3.01 417 0 Normal
05/09/2026 09 AM PDT 3.01 417 0 Normal
05/09/2026 10 AM PDT 3.01 417 0 Normal
05/09/2026 11 AM PDT 3.01 417 0 Normal
05/09/2026 12 PM PDT 3.00 415 - Normal
05/09/2026 01 PM PDT 3.00 415 0 Normal
05/09/2026 02 PM PDT 3.00 415 0 Normal
05/09/2026 03 PM PDT 2.99 413 - Normal
05/09/2026 04 PM PDT 2.99 413 0 Normal
05/09/2026 05 PM PDT 2.99 413 0 Normal
05/09/2026 06 PM PDT 2.98 411 - Normal
05/09/2026 07 PM PDT 2.97 409 - Normal
05/09/2026 08 PM PDT 2.97 409 0 Normal
05/09/2026 09 PM PDT 2.96 406 - Normal
05/09/2026 10 PM PDT 2.95 404 - Normal
05/09/2026 11 PM PDT 2.94 402 - Normal
05/10/2026 12 AM PDT 2.94 402 0 Normal
05/10/2026 01 AM PDT 2.94 402 0 Normal
05/10/2026 02 AM PDT 2.93 400 - Normal
05/10/2026 03 AM PDT 2.92 398 - Normal
05/10/2026 04 AM PDT 2.92 398 0 Normal
05/10/2026 05 AM PDT 2.92 398 0 Normal
05/10/2026 06 AM PDT 2.92 398 0 Normal
05/10/2026 07 AM PDT 2.91 395 - Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
05/10/2026 08 AM PDT 2.91 395 Normal
05/10/2026 09 AM PDT 2.90 393 - Normal
05/10/2026 10 AM PDT 2.90 393 0 Normal
05/10/2026 11 AM PDT 2.90 393 0 Normal
05/10/2026 12 PM PDT 2.89 391 - Normal
05/10/2026 01 PM PDT 2.89 391 0 Normal
05/10/2026 02 PM PDT 2.88 389 - Normal
05/10/2026 03 PM PDT 2.88 389 0 Normal
05/10/2026 04 PM PDT 2.88 389 0 Normal
05/10/2026 05 PM PDT 2.88 389 0 Normal
05/10/2026 06 PM PDT 2.86 385 - Normal
05/10/2026 07 PM PDT 2.86 385 0 Normal
05/10/2026 08 PM PDT 2.86 385 0 Normal
05/10/2026 09 PM PDT 2.85 382 - Normal
05/10/2026 10 PM PDT 2.85 382 0 Normal
05/10/2026 11 PM PDT 2.85 382 0 Normal
05/11/2026 12 AM PDT 2.84 380 - Normal
05/11/2026 01 AM PDT 2.84 380 0 Normal
05/11/2026 02 AM PDT 2.84 380 0 Normal
05/11/2026 03 AM PDT 2.84 380 0 Normal
05/11/2026 04 AM PDT 2.83 378 - Normal
05/11/2026 05 AM PDT 2.83 378 0 Normal
05/11/2026 06 AM PDT 2.83 378 0 Normal
05/11/2026 07 AM PDT 2.83 378 0 Normal
05/11/2026 08 AM PDT 2.83 378 0 Normal
05/11/2026 09 AM PDT 2.82 376 - Normal
05/11/2026 10 AM PDT 2.82 376 0 Normal
05/11/2026 11 AM PDT 2.82 376 0 Normal
05/11/2026 12 PM PDT 2.82 376 0 Normal
05/11/2026 01 PM PDT 2.81 374 - Normal
05/11/2026 02 PM PDT 2.81 374 0 Normal
05/11/2026 03 PM PDT 2.81 374 0 Normal
05/11/2026 04 PM PDT 2.81 374 0 Normal
05/11/2026 05 PM PDT 2.81 374 0 Normal
05/11/2026 06 PM PDT 2.80 372 - Normal
05/11/2026 07 PM PDT 2.79 370 - Normal
05/11/2026 08 PM PDT 2.79 370 0 Normal
05/11/2026 09 PM PDT 2.79 370 0 Normal
05/11/2026 10 PM PDT 2.79 370 0 Normal
05/11/2026 11 PM PDT 2.79 370 0 Normal
05/12/2026 12 AM PDT 2.78 368 - Normal
05/12/2026 01 AM PDT 2.78 368 0 Normal
05/12/2026 02 AM PDT 2.78 368 0 Normal
05/12/2026 03 AM PDT 2.78 368 0 Normal
05/12/2026 04 AM PDT 2.77 366 - Normal
05/12/2026 05 AM PDT 2.77 366 0 Normal
05/12/2026 06 AM PDT 2.77 366 0 Normal
05/12/2026 07 AM PDT 2.77 366 0 Normal
05/12/2026 08 AM PDT 2.77 366 0 Normal
05/12/2026 09 AM PDT 2.76 364 - Normal
05/12/2026 10 AM PDT 2.76 364 0 Normal
05/12/2026 11 AM PDT 2.76 364 0 Normal
05/12/2026 12 PM PDT 2.76 364 0 Normal
05/12/2026 01 PM PDT 2.75 361 - Normal
05/12/2026 02 PM PDT 2.75 361 0 Normal
05/12/2026 03 PM PDT 2.75 361 0 Normal
05/12/2026 04 PM PDT 2.75 361 0 Normal
05/12/2026 05 PM PDT 2.74 359 - Normal
05/12/2026 06 PM PDT 2.73 357 - Normal
05/12/2026 07 PM PDT 2.73 357 0 Normal
05/12/2026 08 PM PDT 2.73 357 0 Normal
05/12/2026 09 PM PDT 2.73 357 0 Normal
05/12/2026 10 PM PDT 2.73 357 0 Normal
05/12/2026 11 PM PDT 2.72 355 - Normal
05/13/2026 12 AM PDT 2.72 355 0 Normal
05/13/2026 01 AM PDT 2.72 355 0 Normal
05/13/2026 02 AM PDT 2.72 355 0 Normal
05/13/2026 03 AM PDT 2.71 353 - Normal
05/13/2026 04 AM PDT 2.71 353 0 Normal
05/13/2026 05 AM PDT 2.71 353 0 Normal
05/13/2026 06 AM PDT 2.71 353 0 Normal
05/13/2026 07 AM PDT 2.71 353 0 Normal
05/13/2026 08 AM PDT 2.70 351 - Normal
05/13/2026 09 AM PDT 2.70 351 0 Normal
05/13/2026 10 AM PDT 2.70 351 0 Normal
05/13/2026 11 AM PDT 2.70 351 0 Normal
05/13/2026 12 PM PDT 2.70 351 0 Normal
05/13/2026 01 PM PDT 2.69 349 - Normal
05/13/2026 02 PM PDT 2.69 349 0 Normal
05/13/2026 03 PM PDT 2.69 349 0 Normal
05/13/2026 04 PM PDT 2.69 349 0 Normal
05/13/2026 05 PM PDT 2.69 349 0 Normal
05/13/2026 06 PM PDT 2.67 345 - Normal
05/13/2026 07 PM PDT 2.67 345 0 Normal
05/13/2026 08 PM PDT 2.67 345 0 Normal
05/13/2026 09 PM PDT 2.67 345 0 Normal
05/13/2026 10 PM PDT 2.67 345 0 Normal
05/13/2026 11 PM PDT 2.66 343 - Normal
05/14/2026 12 AM PDT 2.66 343 0 Normal
05/14/2026 01 AM PDT 2.66 343 0 Normal
05/14/2026 02 AM PDT 2.66 343 0 Normal
05/14/2026 03 AM PDT 2.66 343 0 Normal
05/14/2026 04 AM PDT 2.65 341 - Normal
05/14/2026 05 AM PDT 2.65 341 0 Normal
05/14/2026 06 AM PDT 2.65 341 0 Normal
05/14/2026 07 AM PDT 2.65 341 0 Normal
05/14/2026 08 AM PDT 2.65 341 0 Normal
05/14/2026 09 AM PDT 2.64 339 - Normal
05/14/2026 10 AM PDT 2.64 339 0 Normal
05/14/2026 11 AM PDT 2.64 339 0 Normal
05/14/2026 12 PM PDT 2.64 339 0 Normal
05/14/2026 01 PM PDT 2.63 337 - Normal
05/14/2026 02 PM PDT 2.63 337 0 Normal
05/14/2026 03 PM PDT 2.63 337 0 Normal
05/14/2026 04 PM PDT 2.63 337 0 Normal
05/14/2026 05 PM PDT 2.63 337 0 Normal
05/14/2026 06 PM PDT 2.62 335 - Normal
05/14/2026 07 PM PDT 2.61 333 - Normal
05/14/2026 08 PM PDT 2.61 333 0 Normal
05/14/2026 09 PM PDT 2.61 333 0 Normal
05/14/2026 10 PM PDT 2.61 333 0 Normal
05/14/2026 11 PM PDT 2.61 333 0 Normal
05/15/2026 12 AM PDT 2.60 331 - Normal
05/15/2026 01 AM PDT 2.60 331 0 Normal
05/15/2026 02 AM PDT 2.60 331 0 Normal
05/15/2026 03 AM PDT 2.60 331 0 Normal
05/15/2026 04 AM PDT 2.60 331 0 Normal
05/15/2026 05 AM PDT 2.59 329 - 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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