National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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TUOLUMNE RIVER - MODESTO (MDSC1)
Latitude: 37.63º NLongitude: 120.99º WElevation: 60 FeetForecast Type: Official Location
Location: Stanislaus County in CaliforniaBulletin Group: San JoaquinRiver Group: San Joaquin
Issuance Time: Apr 02 2026 at 8:44 AM PDTNext Issuance: Apr 02 2026 at 3:00 PM PDT
Action/Monitor: 50.5 FeetMinor Flood: 55.0 FeetModerate Flood: 66.0 FeetMajor Flood: 67.0 Feet


# Tabular Observed and Forecast Hydrograph Information
#
# Location: Tuolumne River - Modesto (MDSC1)
#
# File Generation Time:  04/02/2026 at 08:44 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  04/01/2026 at 01:00 AM PDT
# Maximum Observed Stage:                       37.52 Feet
# Maximum Observed Flow:                        407 cfs
#
# Earliest Date & Time of Maximum Forecast:     04/02/2026 at 09:00 AM PDT
# Maximum Forecast Stage:                       37.16 Feet
# Maximum Forecast Flow:                        313 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  03/28/2026 08 AM PDT           37.50            402                        Normal
  03/28/2026 09 AM PDT           37.50            402         0              Normal
  03/28/2026 10 AM PDT           37.49            399         -              Normal
  03/28/2026 11 AM PDT           37.49            399         0              Normal
  03/28/2026 12 PM PDT           37.49            399         0              Normal
  03/28/2026 01 PM PDT           37.50            402         +              Normal
  03/28/2026 02 PM PDT           37.51            404         +              Normal
  03/28/2026 03 PM PDT           37.49            399         -              Normal
  03/28/2026 04 PM PDT           37.47            394         -              Normal
  03/28/2026 05 PM PDT           37.47            394         0              Normal
  03/28/2026 06 PM PDT           37.46            391         -              Normal
  03/28/2026 07 PM PDT           37.45            388         -              Normal
  03/28/2026 08 PM PDT           37.43            383         -              Normal
  03/28/2026 09 PM PDT           37.42            380         -              Normal
  03/28/2026 10 PM PDT           37.41            378         -              Normal
  03/28/2026 11 PM PDT           37.40            375         -              Normal
  03/29/2026 12 AM PDT           37.37            367         -              Normal
  03/29/2026 01 AM PDT           37.36            364         -              Normal
  03/29/2026 02 AM PDT           37.34            359         -              Normal
  03/29/2026 03 AM PDT           37.33            357         -              Normal
  03/29/2026 04 AM PDT           37.32            354         -              Normal
  03/29/2026 05 AM PDT           37.32            354         0              Normal
  03/29/2026 06 AM PDT           37.31            351         -              Normal
  03/29/2026 07 AM PDT           37.31            351         0              Normal
  03/29/2026 08 AM PDT           37.30            349         -              Normal
  03/29/2026 09 AM PDT           37.30            349         0              Normal
  03/29/2026 10 AM PDT           37.30            349         0              Normal
  03/29/2026 11 AM PDT           37.30            349         0              Normal
  03/29/2026 12 PM PDT           37.30            349         0              Normal
  03/29/2026 01 PM PDT           37.30            349         0              Normal
  03/29/2026 02 PM PDT           37.31            351         +              Normal
  03/29/2026 03 PM PDT           37.30            349         -              Normal
  03/29/2026 04 PM PDT           37.31            351         +              Normal
  03/29/2026 05 PM PDT           37.31            351         0              Normal
  03/29/2026 06 PM PDT           37.31            351         0              Normal
  03/29/2026 07 PM PDT           37.31            351         0              Normal
  03/29/2026 08 PM PDT           37.30            349         -              Normal
  03/29/2026 09 PM PDT           37.29            346         -              Normal
  03/29/2026 10 PM PDT           37.28            344         -              Normal
  03/29/2026 11 PM PDT           37.27            341         -              Normal
  03/30/2026 12 AM PDT           37.28            344         +              Normal
  03/30/2026 01 AM PDT           37.27            341         -              Normal
  03/30/2026 02 AM PDT           37.25            336         -              Normal
  03/30/2026 03 AM PDT           37.25            336         0              Normal
  03/30/2026 04 AM PDT           37.24            334         -              Normal
  03/30/2026 05 AM PDT           37.24            334         0              Normal
  03/30/2026 06 AM PDT           37.23            331         -              Normal
  03/30/2026 07 AM PDT           37.22            328         -              Normal
  03/30/2026 08 AM PDT           37.22            328         0              Normal
  03/30/2026 09 AM PDT           37.23            331         +              Normal
  03/30/2026 10 AM PDT           37.24            334         +              Normal
  03/30/2026 11 AM PDT           37.24            334         0              Normal
  03/30/2026 12 PM PDT           37.24            334         0              Normal
  03/30/2026 01 PM PDT           37.23            331         -              Normal
  03/30/2026 02 PM PDT           37.22            328         -              Normal
  03/30/2026 03 PM PDT           37.20            323         -              Normal
  03/30/2026 04 PM PDT           37.21            326         +              Normal
  03/30/2026 05 PM PDT           37.19            321         -              Normal
  03/30/2026 06 PM PDT           37.19            321         0              Normal
  03/30/2026 07 PM PDT           37.18            318         -              Normal
  03/30/2026 08 PM PDT           37.19            321         +              Normal
  03/30/2026 09 PM PDT           37.18            318         -              Normal
  03/30/2026 10 PM PDT           37.18            318         0              Normal
  03/30/2026 11 PM PDT           37.18            318         0              Normal
  03/31/2026 12 AM PDT           37.17            316         -              Normal
  03/31/2026 01 AM PDT           37.17            316         0              Normal
  03/31/2026 02 AM PDT           37.17            316         0              Normal
  03/31/2026 03 AM PDT           37.17            316         0              Normal
  03/31/2026 04 AM PDT           37.18            318         +              Normal
  03/31/2026 05 AM PDT           37.19            321         +              Normal
  03/31/2026 06 AM PDT           37.22            328         +              Normal
  03/31/2026 07 AM PDT           37.24            334         +              Normal
  03/31/2026 08 AM PDT           37.24            334         0              Normal
  03/31/2026 09 AM PDT           37.25            336         +              Normal
  03/31/2026 10 AM PDT           37.25            336         0              Normal
  03/31/2026 11 AM PDT           37.25            336         0              Normal
  03/31/2026 12 PM PDT           37.24            334         -              Normal
  03/31/2026 01 PM PDT           37.23            331         -              Normal
  03/31/2026 02 PM PDT           37.22            328         -              Normal
  03/31/2026 03 PM PDT           37.21            326         -              Normal
  03/31/2026 04 PM PDT           37.20            323         -              Normal
  03/31/2026 05 PM PDT           37.20            323         0              Normal
  03/31/2026 06 PM PDT           37.20            323         0              Normal
  03/31/2026 07 PM PDT           37.21            326         +              Normal
  03/31/2026 08 PM PDT           37.22            328         +              Normal
  03/31/2026 09 PM PDT           37.22            328         0              Normal
  03/31/2026 10 PM PDT           37.23            331         +              Normal
  03/31/2026 11 PM PDT           37.37            367         +              Normal
  04/01/2026 12 AM PDT           37.49            399         +              Normal
  04/01/2026 01 AM PDT           37.52            407         +              Normal
  04/01/2026 02 AM PDT           37.49            399         -              Normal
  04/01/2026 03 AM PDT           37.46            391         -              Normal
  04/01/2026 04 AM PDT           37.43            383         -              Normal
  04/01/2026 05 AM PDT           37.39            372         -              Normal
  04/01/2026 06 AM PDT           37.36            364         -              Normal
  04/01/2026 07 AM PDT           37.33            357         -              Normal
  04/01/2026 08 AM PDT           37.30            349         -              Normal
  04/01/2026 09 AM PDT           37.28            344         -              Normal
  04/01/2026 10 AM PDT           37.27            341         -              Normal
  04/01/2026 11 AM PDT           37.26            339         -              Normal
  04/01/2026 12 PM PDT           37.26            339         0              Normal
  04/01/2026 01 PM PDT           37.25            336         -              Normal
  04/01/2026 02 PM PDT           37.25            336         0              Normal
  04/01/2026 03 PM PDT           37.23            331         -              Normal
  04/01/2026 04 PM PDT           37.24            334         +              Normal
  04/01/2026 05 PM PDT           37.23            331         -              Normal
  04/01/2026 06 PM PDT           37.23            331         0              Normal
  04/01/2026 07 PM PDT           37.22            328         -              Normal
  04/01/2026 08 PM PDT           37.22            328         0              Normal
  04/01/2026 09 PM PDT           37.21            326         -              Normal
  04/01/2026 10 PM PDT           37.20            323         -              Normal
  04/01/2026 11 PM PDT           37.19            321         -              Normal
  04/02/2026 12 AM PDT           37.18            318         -              Normal
  04/02/2026 01 AM PDT           37.17            316         -              Normal
  04/02/2026 02 AM PDT           37.17            316         0              Normal
  04/02/2026 03 AM PDT           37.16            313         -              Normal
  04/02/2026 04 AM PDT           37.16            313         0              Normal
  04/02/2026 05 AM PDT           37.16            313         0              Normal
  04/02/2026 06 AM PDT           37.16            313         0              Normal
  04/02/2026 07 AM PDT           37.16            313         0              Normal
  04/02/2026 08 AM PDT           37.16            313         0              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  04/02/2026 09 AM PDT           37.16            313                        Normal
  04/02/2026 10 AM PDT           37.16            313         0              Normal
  04/02/2026 11 AM PDT           37.16            313         0              Normal
  04/02/2026 12 PM PDT           37.16            313         0              Normal
  04/02/2026 01 PM PDT           37.16            313         0              Normal
  04/02/2026 02 PM PDT           37.16            313         0              Normal
  04/02/2026 03 PM PDT           37.16            313         0              Normal
  04/02/2026 04 PM PDT           37.16            313         0              Normal
  04/02/2026 05 PM PDT           37.16            313         0              Normal
  04/02/2026 06 PM PDT           37.16            313         0              Normal
  04/02/2026 07 PM PDT           37.16            313         0              Normal
  04/02/2026 08 PM PDT           37.15            311         -              Normal
  04/02/2026 09 PM PDT           37.15            311         0              Normal
  04/02/2026 10 PM PDT           37.15            311         0              Normal
  04/02/2026 11 PM PDT           37.15            311         0              Normal
  04/03/2026 12 AM PDT           37.15            311         0              Normal
  04/03/2026 01 AM PDT           37.15            311         0              Normal
  04/03/2026 02 AM PDT           37.15            311         0              Normal
  04/03/2026 03 AM PDT           37.15            311         0              Normal
  04/03/2026 04 AM PDT           37.15            311         0              Normal
  04/03/2026 05 AM PDT           37.15            311         0              Normal
  04/03/2026 06 AM PDT           37.15            311         0              Normal
  04/03/2026 07 AM PDT           37.15            311         0              Normal
  04/03/2026 08 AM PDT           37.15            311         0              Normal
  04/03/2026 09 AM PDT           37.15            311         0              Normal
  04/03/2026 10 AM PDT           37.14            308         -              Normal
  04/03/2026 11 AM PDT           37.14            308         0              Normal
  04/03/2026 12 PM PDT           37.14            308         0              Normal
  04/03/2026 01 PM PDT           37.14            308         0              Normal
  04/03/2026 02 PM PDT           37.14            308         0              Normal
  04/03/2026 03 PM PDT           37.14            308         0              Normal
  04/03/2026 04 PM PDT           37.14            308         0              Normal
  04/03/2026 05 PM PDT           37.14            308         0              Normal
  04/03/2026 06 PM PDT           37.14            308         0              Normal
  04/03/2026 07 PM PDT           37.14            308         0              Normal
  04/03/2026 08 PM PDT           37.14            308         0              Normal
  04/03/2026 09 PM PDT           37.14            308         0              Normal
  04/03/2026 10 PM PDT           37.14            308         0              Normal
  04/03/2026 11 PM PDT           37.14            308         0              Normal
  04/04/2026 12 AM PDT           37.14            308         0              Normal
  04/04/2026 01 AM PDT           37.14            308         0              Normal
  04/04/2026 02 AM PDT           37.14            308         0              Normal
  04/04/2026 03 AM PDT           37.14            308         0              Normal
  04/04/2026 04 AM PDT           37.14            308         0              Normal
  04/04/2026 05 AM PDT           37.14            308         0              Normal
  04/04/2026 06 AM PDT           37.14            308         0              Normal
  04/04/2026 07 AM PDT           37.14            308         0              Normal
  04/04/2026 08 AM PDT           37.14            308         0              Normal
  04/04/2026 09 AM PDT           37.14            308         0              Normal
  04/04/2026 10 AM PDT           37.14            308         0              Normal
  04/04/2026 11 AM PDT           37.14            308         0              Normal
  04/04/2026 12 PM PDT           37.14            308         0              Normal
  04/04/2026 01 PM PDT           37.14            308         0              Normal
  04/04/2026 02 PM PDT           37.14            308         0              Normal
  04/04/2026 03 PM PDT           37.14            308         0              Normal
  04/04/2026 04 PM PDT           37.14            308         0              Normal
  04/04/2026 05 PM PDT           37.14            308         0              Normal
  04/04/2026 06 PM PDT           37.14            308         0              Normal
  04/04/2026 07 PM PDT           37.14            308         0              Normal
  04/04/2026 08 PM PDT           37.14            308         0              Normal
  04/04/2026 09 PM PDT           37.14            308         0              Normal
  04/04/2026 10 PM PDT           37.14            308         0              Normal
  04/04/2026 11 PM PDT           37.14            308         0              Normal
  04/05/2026 12 AM PDT           37.14            308         0              Normal
  04/05/2026 01 AM PDT           37.14            308         0              Normal
  04/05/2026 02 AM PDT           37.14            308         0              Normal
  04/05/2026 03 AM PDT           37.14            308         0              Normal
  04/05/2026 04 AM PDT           37.14            308         0              Normal
  04/05/2026 05 AM PDT           37.14            308         0              Normal
  04/05/2026 06 AM PDT           37.14            308         0              Normal
  04/05/2026 07 AM PDT           37.14            308         0              Normal
  04/05/2026 08 AM PDT           37.14            308         0              Normal
  04/05/2026 09 AM PDT           37.14            308         0              Normal
  04/05/2026 10 AM PDT           37.14            308         0              Normal
  04/05/2026 11 AM PDT           37.14            308         0              Normal
  04/05/2026 12 PM PDT           37.14            308         0              Normal
  04/05/2026 01 PM PDT           37.14            308         0              Normal
  04/05/2026 02 PM PDT           37.14            308         0              Normal
  04/05/2026 03 PM PDT           37.14            308         0              Normal
  04/05/2026 04 PM PDT           37.14            308         0              Normal
  04/05/2026 05 PM PDT           37.14            308         0              Normal
  04/05/2026 06 PM PDT           37.14            308         0              Normal
  04/05/2026 07 PM PDT           37.14            308         0              Normal
  04/05/2026 08 PM PDT           37.14            308         0              Normal
  04/05/2026 09 PM PDT           37.14            308         0              Normal
  04/05/2026 10 PM PDT           37.14            308         0              Normal
  04/05/2026 11 PM PDT           37.14            308         0              Normal
  04/06/2026 12 AM PDT           37.14            308         0              Normal
  04/06/2026 01 AM PDT           37.14            308         0              Normal
  04/06/2026 02 AM PDT           37.14            308         0              Normal
  04/06/2026 03 AM PDT           37.14            308         0              Normal
  04/06/2026 04 AM PDT           37.14            308         0              Normal
  04/06/2026 05 AM PDT           37.14            308         0              Normal
  04/06/2026 06 AM PDT           37.14            308         0              Normal
  04/06/2026 07 AM PDT           37.14            308         0              Normal
  04/06/2026 08 AM PDT           37.14            308         0              Normal
  04/06/2026 09 AM PDT           37.14            308         0              Normal
  04/06/2026 10 AM PDT           37.14            308         0              Normal
  04/06/2026 11 AM PDT           37.14            308         0              Normal
  04/06/2026 12 PM PDT           37.14            308         0              Normal
  04/06/2026 01 PM PDT           37.14            308         0              Normal
  04/06/2026 02 PM PDT           37.14            308         0              Normal
  04/06/2026 03 PM PDT           37.14            308         0              Normal
  04/06/2026 04 PM PDT           37.14            308         0              Normal
  04/06/2026 05 PM PDT           37.14            308         0              Normal
  04/06/2026 06 PM PDT           37.14            308         0              Normal
  04/06/2026 07 PM PDT           37.14            308         0              Normal
  04/06/2026 08 PM PDT           37.14            308         0              Normal
  04/06/2026 09 PM PDT           37.14            308         0              Normal
  04/06/2026 10 PM PDT           37.14            308         0              Normal
  04/06/2026 11 PM PDT           37.14            308         0              Normal
  04/07/2026 12 AM PDT           37.14            308         0              Normal
  04/07/2026 01 AM PDT           37.14            308         0              Normal
  04/07/2026 02 AM PDT           37.14            308         0              Normal
  04/07/2026 03 AM PDT           37.14            308         0              Normal
  04/07/2026 04 AM PDT           37.14            308         0              Normal
  04/07/2026 05 AM PDT           37.14            308         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.