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SAN JOAQUIN RIVER - VERNALIS (VNSC1)
| Latitude: 37.68º N | Longitude: 121.27º W | Elevation: 35 Feet | | | |
| Location: San Joaquin County in California | Bulletin Group: San Joaquin | River Group: San Joaquin |
| Issuance Time: | Jan 21 2026 at 2:31 PM PST | Next Issuance: | Jan 22 2026 at 9:00 AM PST
| |
| Action/Monitor: 24.5 Feet | Minor Flood: 29.0 Feet | Moderate Flood: 32.0 Feet | Major Flood: 37.3 Feet |
# Tabular Observed and Forecast Hydrograph Information
#
# Location: San Joaquin River - Vernalis (VNSC1)
#
# File Generation Time: 01/21/2026 at 02:31 PM PST
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 01/16/2026 at 02:00 PM PST
# Maximum Observed Stage: 10.32 Feet
# Maximum Observed Flow: 2612 cfs
#
# Earliest Date & Time of Maximum Forecast: 01/23/2026 at 05:00 AM PST
# Maximum Forecast Stage: 10.31 Feet
# Maximum Forecast Flow: 2604 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
01/16/2026 02 PM PST 10.32 2612 Normal
01/16/2026 03 PM PST 10.31 2604 - Normal
01/16/2026 04 PM PST 10.31 2604 0 Normal
01/16/2026 05 PM PST 10.31 2604 0 Normal
01/16/2026 06 PM PST 10.30 2596 - Normal
01/16/2026 07 PM PST 10.30 2596 0 Normal
01/16/2026 08 PM PST 10.30 2596 0 Normal
01/16/2026 09 PM PST 10.30 2596 0 Normal
01/16/2026 10 PM PST 10.29 2588 - Normal
01/16/2026 11 PM PST 10.29 2588 0 Normal
01/17/2026 12 AM PST 10.29 2588 0 Normal
01/17/2026 01 AM PST 10.28 2580 - Normal
01/17/2026 02 AM PST 10.28 2580 0 Normal
01/17/2026 03 AM PST 10.27 2572 - Normal
01/17/2026 04 AM PST 10.27 2572 0 Normal
01/17/2026 05 AM PST 10.26 2564 - Normal
01/17/2026 06 AM PST 10.26 2564 0 Normal
01/17/2026 07 AM PST 10.26 2564 0 Normal
01/17/2026 08 AM PST 10.26 2564 0 Normal
01/17/2026 09 AM PST 10.26 2564 0 Normal
01/17/2026 10 AM PST 10.26 2564 0 Normal
01/17/2026 11 AM PST 10.25 2556 - Normal
01/17/2026 12 PM PST 10.25 2556 0 Normal
01/17/2026 01 PM PST 10.25 2556 0 Normal
01/17/2026 02 PM PST 10.25 2556 0 Normal
01/17/2026 03 PM PST 10.25 2556 0 Normal
01/17/2026 04 PM PST 10.25 2556 0 Normal
01/17/2026 05 PM PST 10.24 2547 - Normal
01/17/2026 06 PM PST 10.24 2547 0 Normal
01/17/2026 07 PM PST 10.23 2539 - Normal
01/17/2026 08 PM PST 10.23 2539 0 Normal
01/17/2026 09 PM PST 10.23 2539 0 Normal
01/17/2026 10 PM PST 10.23 2539 0 Normal
01/17/2026 11 PM PST 10.22 2531 - Normal
01/18/2026 12 AM PST 10.22 2531 0 Normal
01/18/2026 01 AM PST 10.21 2523 - Normal
01/18/2026 02 AM PST 10.21 2523 0 Normal
01/18/2026 03 AM PST 10.21 2523 0 Normal
01/18/2026 04 AM PST 10.20 2515 - Normal
01/18/2026 05 AM PST 10.21 2523 + Normal
01/18/2026 06 AM PST 10.20 2515 - Normal
01/18/2026 07 AM PST 10.20 2515 0 Normal
01/18/2026 08 AM PST 10.20 2515 0 Normal
01/18/2026 09 AM PST 10.20 2515 0 Normal
01/18/2026 10 AM PST 10.20 2515 0 Normal
01/18/2026 11 AM PST 10.20 2515 0 Normal
01/18/2026 12 PM PST 10.20 2515 0 Normal
01/18/2026 01 PM PST 10.20 2515 0 Normal
01/18/2026 02 PM PST 10.20 2515 0 Normal
01/18/2026 03 PM PST 10.20 2515 0 Normal
01/18/2026 04 PM PST 10.19 2507 - Normal
01/18/2026 05 PM PST 10.19 2507 0 Normal
01/18/2026 06 PM PST 10.19 2507 0 Normal
01/18/2026 07 PM PST 10.19 2507 0 Normal
01/18/2026 08 PM PST 10.19 2507 0 Normal
01/18/2026 09 PM PST 10.19 2507 0 Normal
01/18/2026 10 PM PST 10.19 2507 0 Normal
01/18/2026 11 PM PST 10.19 2507 0 Normal
01/19/2026 12 AM PST 10.19 2507 0 Normal
01/19/2026 01 AM PST 10.18 2499 - Normal
01/19/2026 02 AM PST 10.18 2499 0 Normal
01/19/2026 03 AM PST 10.18 2499 0 Normal
01/19/2026 04 AM PST 10.18 2499 0 Normal
01/19/2026 05 AM PST 10.17 2491 - Normal
01/19/2026 06 AM PST 10.17 2491 0 Normal
01/19/2026 07 AM PST 10.17 2491 0 Normal
01/19/2026 08 AM PST 10.17 2491 0 Normal
01/19/2026 09 AM PST 10.16 2483 - Normal
01/19/2026 10 AM PST 10.16 2483 0 Normal
01/19/2026 11 AM PST 10.16 2483 0 Normal
01/19/2026 12 PM PST 10.16 2483 0 Normal
01/19/2026 01 PM PST 10.16 2483 0 Normal
01/19/2026 02 PM PST 10.17 2491 + Normal
01/19/2026 03 PM PST 10.17 2491 0 Normal
01/19/2026 04 PM PST 10.16 2483 - Normal
01/19/2026 05 PM PST 10.17 2491 + Normal
01/19/2026 06 PM PST 10.16 2483 - Normal
01/19/2026 07 PM PST 10.16 2483 0 Normal
01/19/2026 08 PM PST 10.16 2483 0 Normal
01/19/2026 09 PM PST 10.15 2475 - Normal
01/19/2026 10 PM PST 10.15 2475 0 Normal
01/19/2026 11 PM PST 10.15 2475 0 Normal
01/20/2026 12 AM PST 10.16 2483 + Normal
01/20/2026 01 AM PST 10.16 2483 0 Normal
01/20/2026 02 AM PST 10.15 2475 - Normal
01/20/2026 03 AM PST 10.15 2475 0 Normal
01/20/2026 04 AM PST 10.15 2475 0 Normal
01/20/2026 05 AM PST 10.15 2475 0 Normal
01/20/2026 06 AM PST 10.15 2475 0 Normal
01/20/2026 07 AM PST 10.15 2475 0 Normal
01/20/2026 08 AM PST 10.15 2475 0 Normal
01/20/2026 09 AM PST 10.15 2475 0 Normal
01/20/2026 10 AM PST 10.15 2475 0 Normal
01/20/2026 11 AM PST 10.15 2475 0 Normal
01/20/2026 12 PM PST 10.15 2475 0 Normal
01/20/2026 01 PM PST 10.14 2467 - Normal
01/20/2026 02 PM PST 10.14 2467 0 Normal
01/20/2026 03 PM PST 10.14 2467 0 Normal
01/20/2026 04 PM PST 10.14 2467 0 Normal
01/20/2026 05 PM PST 10.14 2467 0 Normal
01/20/2026 06 PM PST 10.14 2467 0 Normal
01/20/2026 07 PM PST 10.14 2467 0 Normal
01/20/2026 08 PM PST 10.13 2459 - Normal
01/20/2026 09 PM PST 10.13 2459 0 Normal
01/20/2026 10 PM PST 10.14 2467 + Normal
01/20/2026 11 PM PST 10.13 2459 - Normal
01/21/2026 12 AM PST 10.13 2459 0 Normal
01/21/2026 01 AM PST 10.14 2467 + Normal
01/21/2026 02 AM PST 10.13 2459 - Normal
01/21/2026 03 AM PST 10.13 2459 0 Normal
01/21/2026 04 AM PST 10.13 2459 0 Normal
01/21/2026 05 AM PST 10.13 2459 0 Normal
01/21/2026 06 AM PST 10.13 2459 0 Normal
01/21/2026 07 AM PST 10.13 2459 0 Normal
01/21/2026 08 AM PST 10.13 2459 0 Normal
01/21/2026 09 AM PST 10.13 2459 0 Normal
01/21/2026 10 AM PST 10.13 2459 0 Normal
01/21/2026 11 AM PST 10.13 2459 0 Normal
01/21/2026 12 PM PST 10.13 2459 0 Normal
01/21/2026 01 PM PST 10.13 2459 0 Normal
01/21/2026 02 PM PST 10.13 2459 0 Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
01/21/2026 03 PM PST 10.13 2459 Normal
01/21/2026 04 PM PST 10.13 2459 0 Normal
01/21/2026 05 PM PST 10.13 2459 0 Normal
01/21/2026 06 PM PST 10.13 2459 0 Normal
01/21/2026 07 PM PST 10.13 2459 0 Normal
01/21/2026 08 PM PST 10.12 2451 - Normal
01/21/2026 09 PM PST 10.12 2451 0 Normal
01/21/2026 10 PM PST 10.12 2451 0 Normal
01/21/2026 11 PM PST 10.12 2451 0 Normal
01/22/2026 12 AM PST 10.12 2451 0 Normal
01/22/2026 01 AM PST 10.12 2451 0 Normal
01/22/2026 02 AM PST 10.12 2451 0 Normal
01/22/2026 03 AM PST 10.12 2451 0 Normal
01/22/2026 04 AM PST 10.12 2451 0 Normal
01/22/2026 05 AM PST 10.12 2451 0 Normal
01/22/2026 06 AM PST 10.13 2459 + Normal
01/22/2026 07 AM PST 10.13 2459 0 Normal
01/22/2026 08 AM PST 10.14 2467 + Normal
01/22/2026 09 AM PST 10.14 2467 0 Normal
01/22/2026 10 AM PST 10.15 2475 + Normal
01/22/2026 11 AM PST 10.15 2475 0 Normal
01/22/2026 12 PM PST 10.16 2483 + Normal
01/22/2026 01 PM PST 10.17 2491 + Normal
01/22/2026 02 PM PST 10.18 2499 + Normal
01/22/2026 03 PM PST 10.19 2507 + Normal
01/22/2026 04 PM PST 10.20 2515 + Normal
01/22/2026 05 PM PST 10.21 2523 + Normal
01/22/2026 06 PM PST 10.22 2531 + Normal
01/22/2026 07 PM PST 10.23 2539 + Normal
01/22/2026 08 PM PST 10.24 2547 + Normal
01/22/2026 09 PM PST 10.25 2556 + Normal
01/22/2026 10 PM PST 10.26 2564 + Normal
01/22/2026 11 PM PST 10.27 2572 + Normal
01/23/2026 12 AM PST 10.27 2572 0 Normal
01/23/2026 01 AM PST 10.28 2580 + Normal
01/23/2026 02 AM PST 10.29 2588 + Normal
01/23/2026 03 AM PST 10.29 2588 0 Normal
01/23/2026 04 AM PST 10.30 2596 + Normal
01/23/2026 05 AM PST 10.31 2604 + Normal
01/23/2026 06 AM PST 10.31 2604 0 Normal
01/23/2026 07 AM PST 10.31 2604 0 Normal
01/23/2026 08 AM PST 10.31 2604 0 Normal
01/23/2026 09 AM PST 10.31 2604 0 Normal
01/23/2026 10 AM PST 10.31 2604 0 Normal
01/23/2026 11 AM PST 10.31 2604 0 Normal
01/23/2026 12 PM PST 10.31 2604 0 Normal
01/23/2026 01 PM PST 10.30 2596 - Normal
01/23/2026 02 PM PST 10.30 2596 0 Normal
01/23/2026 03 PM PST 10.29 2588 - Normal
01/23/2026 04 PM PST 10.29 2588 0 Normal
01/23/2026 05 PM PST 10.28 2580 - Normal
01/23/2026 06 PM PST 10.27 2572 - Normal
01/23/2026 07 PM PST 10.27 2572 0 Normal
01/23/2026 08 PM PST 10.26 2564 - Normal
01/23/2026 09 PM PST 10.25 2556 - Normal
01/23/2026 10 PM PST 10.24 2547 - Normal
01/23/2026 11 PM PST 10.23 2539 - Normal
01/24/2026 12 AM PST 10.22 2531 - Normal
01/24/2026 01 AM PST 10.22 2531 0 Normal
01/24/2026 02 AM PST 10.21 2523 - Normal
01/24/2026 03 AM PST 10.20 2515 - Normal
01/24/2026 04 AM PST 10.19 2507 - Normal
01/24/2026 05 AM PST 10.18 2499 - Normal
01/24/2026 06 AM PST 10.17 2491 - Normal
01/24/2026 07 AM PST 10.16 2483 - Normal
01/24/2026 08 AM PST 10.15 2475 - Normal
01/24/2026 09 AM PST 10.14 2467 - Normal
01/24/2026 10 AM PST 10.13 2459 - Normal
01/24/2026 11 AM PST 10.13 2459 0 Normal
01/24/2026 12 PM PST 10.12 2451 - Normal
01/24/2026 01 PM PST 10.11 2443 - Normal
01/24/2026 02 PM PST 10.10 2436 - Normal
01/24/2026 03 PM PST 10.09 2428 - Normal
01/24/2026 04 PM PST 10.08 2420 - Normal
01/24/2026 05 PM PST 10.08 2420 0 Normal
01/24/2026 06 PM PST 10.07 2412 - Normal
01/24/2026 07 PM PST 10.06 2404 - Normal
01/24/2026 08 PM PST 10.05 2396 - Normal
01/24/2026 09 PM PST 10.04 2388 - Normal
01/24/2026 10 PM PST 10.04 2388 0 Normal
01/24/2026 11 PM PST 10.03 2380 - Normal
01/25/2026 12 AM PST 10.02 2373 - Normal
01/25/2026 01 AM PST 10.02 2373 0 Normal
01/25/2026 02 AM PST 10.01 2365 - Normal
01/25/2026 03 AM PST 10.00 2357 - Normal
01/25/2026 04 AM PST 10.00 2357 0 Normal
01/25/2026 05 AM PST 9.99 2349 - Normal
01/25/2026 06 AM PST 9.98 2341 - Normal
01/25/2026 07 AM PST 9.98 2341 0 Normal
01/25/2026 08 AM PST 9.97 2333 - Normal
01/25/2026 09 AM PST 9.97 2333 0 Normal
01/25/2026 10 AM PST 9.96 2326 - Normal
01/25/2026 11 AM PST 9.96 2326 0 Normal
01/25/2026 12 PM PST 9.95 2318 - Normal
01/25/2026 01 PM PST 9.95 2318 0 Normal
01/25/2026 02 PM PST 9.94 2310 - Normal
01/25/2026 03 PM PST 9.94 2310 0 Normal
01/25/2026 04 PM PST 9.93 2302 - Normal
01/25/2026 05 PM PST 9.93 2302 0 Normal
01/25/2026 06 PM PST 9.92 2295 - Normal
01/25/2026 07 PM PST 9.92 2295 0 Normal
01/25/2026 08 PM PST 9.91 2287 - Normal
01/25/2026 09 PM PST 9.91 2287 0 Normal
01/25/2026 10 PM PST 9.91 2287 0 Normal
01/25/2026 11 PM PST 9.90 2279 - Normal
01/26/2026 12 AM PST 9.90 2279 0 Normal
01/26/2026 01 AM PST 9.90 2279 0 Normal
01/26/2026 02 AM PST 9.89 2272 - Normal
01/26/2026 03 AM PST 9.89 2272 0 Normal
01/26/2026 04 AM PST 9.89 2272 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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