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: Oct 17 2026 at 7:06 AM PDTNext Issuance: Oct 18 2026 at 9:00 AM PDT
Action: 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:  10/17/2026 at 07:06 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  10/17/2026 at 06:00 AM PDT
# Maximum Observed Stage:                       39.50 Feet
# Maximum Observed Flow:                        1027 cfs
#
# Earliest Date & Time of Maximum Forecast:     10/18/2026 at 11:00 AM PDT
# Maximum Forecast Stage:                       41.06 Feet
# Maximum Forecast Flow:                        1615 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  10/12/2026 07 AM PDT           37.05            235                        Normal
  10/12/2026 08 AM PDT           37.07            241         +              Normal
  10/12/2026 09 AM PDT           37.09            246         +              Normal
  10/12/2026 10 AM PDT           37.10            248         +              Normal
  10/12/2026 11 AM PDT           37.10            248         0              Normal
  10/12/2026 12 PM PDT           37.08            243         -              Normal
  10/12/2026 01 PM PDT           37.07            241         -              Normal
  10/12/2026 02 PM PDT           37.06            238         -              Normal
  10/12/2026 03 PM PDT           37.05            235         -              Normal
  10/12/2026 04 PM PDT           37.04            233         -              Normal
  10/12/2026 05 PM PDT           37.03            230         -              Normal
  10/12/2026 06 PM PDT           37.02            228         -              Normal
  10/12/2026 07 PM PDT           37.01            225         -              Normal
  10/12/2026 08 PM PDT           37.01            225         0              Normal
  10/12/2026 09 PM PDT           37.01            225         0              Normal
  10/12/2026 10 PM PDT           37.02            228         +              Normal
  10/12/2026 11 PM PDT           37.03            230         +              Normal
  10/13/2026 12 AM PDT           37.03            230         0              Normal
  10/13/2026 01 AM PDT           37.04            233         +              Normal
  10/13/2026 02 AM PDT           37.03            230         -              Normal
  10/13/2026 03 AM PDT           37.04            233         +              Normal
  10/13/2026 04 AM PDT           37.04            233         0              Normal
  10/13/2026 05 AM PDT           37.06            238         +              Normal
  10/13/2026 06 AM PDT           37.07            241         +              Normal
  10/13/2026 07 AM PDT           37.07            241         0              Normal
  10/13/2026 08 AM PDT           37.07            241         0              Normal
  10/13/2026 09 AM PDT           37.07            241         0              Normal
  10/13/2026 10 AM PDT           37.07            241         0              Normal
  10/13/2026 11 AM PDT           37.07            241         0              Normal
  10/13/2026 12 PM PDT           37.08            243         +              Normal
  10/13/2026 01 PM PDT           37.08            243         0              Normal
  10/13/2026 02 PM PDT           37.08            243         0              Normal
  10/13/2026 03 PM PDT           37.09            246         +              Normal
  10/13/2026 04 PM PDT           37.09            246         0              Normal
  10/13/2026 05 PM PDT           37.09            246         0              Normal
  10/13/2026 06 PM PDT           37.10            248         +              Normal
  10/13/2026 07 PM PDT           37.09            246         -              Normal
  10/13/2026 08 PM PDT           37.09            246         0              Normal
  10/13/2026 09 PM PDT           37.08            243         -              Normal
  10/13/2026 10 PM PDT           37.07            241         -              Normal
  10/13/2026 11 PM PDT           37.06            238         -              Normal
  10/14/2026 12 AM PDT           37.05            235         -              Normal
  10/14/2026 01 AM PDT           37.03            230         -              Normal
  10/14/2026 02 AM PDT           37.03            230         0              Normal
  10/14/2026 03 AM PDT           37.02            228         -              Normal
  10/14/2026 04 AM PDT           37.02            228         0              Normal
  10/14/2026 05 AM PDT           37.01            225         -              Normal
  10/14/2026 06 AM PDT           37.01            225         0              Normal
  10/14/2026 07 AM PDT           37.01            225         0              Normal
  10/14/2026 08 AM PDT           37.00            223         -              Normal
  10/14/2026 09 AM PDT           37.01            225         +              Normal
  10/14/2026 10 AM PDT           37.01            225         0              Normal
  10/14/2026 11 AM PDT           37.01            225         0              Normal
  10/14/2026 12 PM PDT           37.01            225         0              Normal
  10/14/2026 01 PM PDT           37.02            228         +              Normal
  10/14/2026 02 PM PDT           37.04            233         +              Normal
  10/14/2026 03 PM PDT           37.04            233         0              Normal
  10/14/2026 04 PM PDT           37.04            233         0              Normal
  10/14/2026 05 PM PDT           37.03            230         -              Normal
  10/14/2026 06 PM PDT           37.02            228         -              Normal
  10/14/2026 07 PM PDT           37.01            225         -              Normal
  10/14/2026 08 PM PDT           36.99            220         -              Normal
  10/14/2026 09 PM PDT           36.98            218         -              Normal
  10/14/2026 10 PM PDT           36.97            215         -              Normal
  10/14/2026 11 PM PDT           36.97            215         0              Normal
  10/15/2026 12 AM PDT           36.97            215         0              Normal
  10/15/2026 01 AM PDT           36.97            215         0              Normal
  10/15/2026 02 AM PDT           36.97            215         0              Normal
  10/15/2026 03 AM PDT           36.98            218         +              Normal
  10/15/2026 04 AM PDT           36.98            218         0              Normal
  10/15/2026 05 AM PDT           36.99            220         +              Normal
  10/15/2026 06 AM PDT           36.99            220         0              Normal
  10/15/2026 07 AM PDT           36.99            220         0              Normal
  10/15/2026 08 AM PDT           36.99            220         0              Normal
  10/15/2026 09 AM PDT           37.00            223         +              Normal
  10/15/2026 10 AM PDT           37.00            223         0              Normal
  10/15/2026 11 AM PDT           37.01            225         +              Normal
  10/15/2026 12 PM PDT           37.01            225         0              Normal
  10/15/2026 01 PM PDT           37.02            228         +              Normal
  10/15/2026 02 PM PDT           37.02            228         0              Normal
  10/15/2026 03 PM PDT           37.02            228         0              Normal
  10/15/2026 04 PM PDT           37.03            230         +              Normal
  10/15/2026 05 PM PDT           37.03            230         0              Normal
  10/15/2026 06 PM PDT           37.04            233         +              Normal
  10/15/2026 07 PM PDT           37.04            233         0              Normal
  10/15/2026 08 PM PDT           37.04            233         0              Normal
  10/15/2026 09 PM PDT           37.06            238         +              Normal
  10/15/2026 10 PM PDT           37.08            243         +              Normal
  10/15/2026 11 PM PDT           37.11            251         +              Normal
  10/16/2026 12 AM PDT           37.17            267         +              Normal
  10/16/2026 01 AM PDT           37.23            283         +              Normal
  10/16/2026 02 AM PDT           37.31            304         +              Normal
  10/16/2026 03 AM PDT           37.38            324         +              Normal
  10/16/2026 04 AM PDT           37.47            349         +              Normal
  10/16/2026 05 AM PDT           37.56            375         +              Normal
  10/16/2026 06 AM PDT           37.64            399         +              Normal
  10/16/2026 07 AM PDT           37.72            423         +              Normal
  10/16/2026 08 AM PDT           37.79            444         +              Normal
  10/16/2026 09 AM PDT           37.86            466         +              Normal
  10/16/2026 10 AM PDT           37.92            485         +              Normal
  10/16/2026 11 AM PDT           37.97            500         +              Normal
  10/16/2026 12 PM PDT           38.03            520         +              Normal
  10/16/2026 01 PM PDT           38.06            529         +              Normal
  10/16/2026 02 PM PDT           38.11            545         +              Normal
  10/16/2026 03 PM PDT           38.15            558         +              Normal
  10/16/2026 04 PM PDT           38.21            578         +              Normal
  10/16/2026 05 PM PDT           38.27            598         +              Normal
  10/16/2026 06 PM PDT           38.36            628         +              Normal
  10/16/2026 07 PM PDT           38.47            666         +              Normal
  10/16/2026 08 PM PDT           38.57            701         +              Normal
  10/16/2026 09 PM PDT           38.67            736         +              Normal
  10/16/2026 10 PM PDT           38.77            772         +              Normal
  10/16/2026 11 PM PDT           38.89            815         +              Normal
  10/17/2026 12 AM PDT           39.00            856         +              Normal
  10/17/2026 01 AM PDT           39.09            886         +              Normal
  10/17/2026 02 AM PDT           39.20            923         +              Normal
  10/17/2026 03 AM PDT           39.31            961         +              Normal
  10/17/2026 04 AM PDT           39.40            992         +              Normal
  10/17/2026 05 AM PDT           39.46           1013         +              Normal
  10/17/2026 06 AM PDT           39.50           1027         +              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  10/17/2026 07 AM PDT           39.53           1038                        Normal
  10/17/2026 08 AM PDT           39.56           1048         +              Normal
  10/17/2026 09 AM PDT           39.59           1059         +              Normal
  10/17/2026 10 AM PDT           39.61           1066         +              Normal
  10/17/2026 11 AM PDT           39.64           1077         +              Normal
  10/17/2026 12 PM PDT           39.69           1094         +              Normal
  10/17/2026 01 PM PDT           39.77           1123         +              Normal
  10/17/2026 02 PM PDT           39.88           1163         +              Normal
  10/17/2026 03 PM PDT           40.02           1214         +              Normal
  10/17/2026 04 PM PDT           40.14           1259         +              Normal
  10/17/2026 05 PM PDT           40.25           1300         +              Normal
  10/17/2026 06 PM PDT           40.35           1338         +              Normal
  10/17/2026 07 PM PDT           40.44           1372         +              Normal
  10/17/2026 08 PM PDT           40.52           1403         +              Normal
  10/17/2026 09 PM PDT           40.59           1430         +              Normal
  10/17/2026 10 PM PDT           40.65           1453         +              Normal
  10/17/2026 11 PM PDT           40.71           1476         +              Normal
  10/18/2026 12 AM PDT           40.76           1496         +              Normal
  10/18/2026 01 AM PDT           40.81           1516         +              Normal
  10/18/2026 02 AM PDT           40.85           1531         +              Normal
  10/18/2026 03 AM PDT           40.88           1543         +              Normal
  10/18/2026 04 AM PDT           40.91           1555         +              Normal
  10/18/2026 05 AM PDT           40.94           1567         +              Normal
  10/18/2026 06 AM PDT           40.97           1579         +              Normal
  10/18/2026 07 AM PDT           40.99           1587         +              Normal
  10/18/2026 08 AM PDT           41.01           1595         +              Normal
  10/18/2026 09 AM PDT           41.03           1603         +              Normal
  10/18/2026 10 AM PDT           41.05           1611         +              Normal
  10/18/2026 11 AM PDT           41.06           1615         +              Normal
  10/18/2026 12 PM PDT           41.05           1611         -              Normal
  10/18/2026 01 PM PDT           41.00           1591         -              Normal
  10/18/2026 02 PM PDT           40.93           1563         -              Normal
  10/18/2026 03 PM PDT           40.84           1527         -              Normal
  10/18/2026 04 PM PDT           40.75           1492         -              Normal
  10/18/2026 05 PM PDT           40.67           1461         -              Normal
  10/18/2026 06 PM PDT           40.59           1430         -              Normal
  10/18/2026 07 PM PDT           40.52           1403         -              Normal
  10/18/2026 08 PM PDT           40.46           1380         -              Normal
  10/18/2026 09 PM PDT           40.41           1361         -              Normal
  10/18/2026 10 PM PDT           40.36           1342         -              Normal
  10/18/2026 11 PM PDT           40.31           1323         -              Normal
  10/19/2026 12 AM PDT           40.27           1308         -              Normal
  10/19/2026 01 AM PDT           40.24           1296         -              Normal
  10/19/2026 02 AM PDT           40.21           1285         -              Normal
  10/19/2026 03 AM PDT           40.18           1274         -              Normal
  10/19/2026 04 AM PDT           40.15           1263         -              Normal
  10/19/2026 05 AM PDT           40.13           1255         -              Normal
  10/19/2026 06 AM PDT           40.11           1248         -              Normal
  10/19/2026 07 AM PDT           40.09           1240         -              Normal
  10/19/2026 08 AM PDT           40.08           1237         -              Normal
  10/19/2026 09 AM PDT           40.06           1229         -              Normal
  10/19/2026 10 AM PDT           40.05           1225         -              Normal
  10/19/2026 11 AM PDT           40.03           1218         -              Normal
  10/19/2026 12 PM PDT           40.00           1207         -              Normal
  10/19/2026 01 PM PDT           39.94           1185         -              Normal
  10/19/2026 02 PM PDT           39.86           1156         -              Normal
  10/19/2026 03 PM PDT           39.77           1123         -              Normal
  10/19/2026 04 PM PDT           39.68           1091         -              Normal
  10/19/2026 05 PM PDT           39.59           1059         -              Normal
  10/19/2026 06 PM PDT           39.50           1027         -              Normal
  10/19/2026 07 PM PDT           39.42            999         -              Normal
  10/19/2026 08 PM PDT           39.35            975         -              Normal
  10/19/2026 09 PM PDT           39.28            950         -              Normal
  10/19/2026 10 PM PDT           39.23            933         -              Normal
  10/19/2026 11 PM PDT           39.17            913         -              Normal
  10/20/2026 12 AM PDT           39.13            899         -              Normal
  10/20/2026 01 AM PDT           39.09            886         -              Normal
  10/20/2026 02 AM PDT           39.05            872         -              Normal
  10/20/2026 03 AM PDT           39.01            859         -              Normal
  10/20/2026 04 AM PDT           38.98            848         -              Normal
  10/20/2026 05 AM PDT           38.96            841         -              Normal
  10/20/2026 06 AM PDT           38.94            833         -              Normal
  10/20/2026 07 AM PDT           38.92            826         -              Normal
  10/20/2026 08 AM PDT           38.90            819         -              Normal
  10/20/2026 09 AM PDT           38.89            815         -              Normal
  10/20/2026 10 AM PDT           38.87            808         -              Normal
  10/20/2026 11 AM PDT           38.86            804         -              Normal
  10/20/2026 12 PM PDT           38.85            801         -              Normal
  10/20/2026 01 PM PDT           38.83            793         -              Normal
  10/20/2026 02 PM PDT           38.80            782         -              Normal
  10/20/2026 03 PM PDT           38.75            765         -              Normal
  10/20/2026 04 PM PDT           38.70            747         -              Normal
  10/20/2026 05 PM PDT           38.64            725         -              Normal
  10/20/2026 06 PM PDT           38.58            704         -              Normal
  10/20/2026 07 PM PDT           38.52            683         -              Normal
  10/20/2026 08 PM PDT           38.46            663         -              Normal
  10/20/2026 09 PM PDT           38.41            645         -              Normal
  10/20/2026 10 PM PDT           38.37            632         -              Normal
  10/20/2026 11 PM PDT           38.33            618         -              Normal
  10/21/2026 12 AM PDT           38.30            608         -              Normal
  10/21/2026 01 AM PDT           38.26            595         -              Normal
  10/21/2026 02 AM PDT           38.23            585         -              Normal
  10/21/2026 03 AM PDT           38.21            578         -              Normal
  10/21/2026 04 AM PDT           38.19            572         -              Normal
  10/21/2026 05 AM PDT           38.17            565         -              Normal
  10/21/2026 06 AM PDT           38.15            558         -              Normal
  10/21/2026 07 AM PDT           38.13            552         -              Normal
  10/21/2026 08 AM PDT           38.12            549         -              Normal
  10/21/2026 09 AM PDT           38.10            542         -              Normal
  10/21/2026 10 AM PDT           38.09            539         -              Normal
  10/21/2026 11 AM PDT           38.08            536         -              Normal
  10/21/2026 12 PM PDT           38.07            532         -              Normal
  10/21/2026 01 PM PDT           38.06            529         -              Normal
  10/21/2026 02 PM PDT           38.05            526         -              Normal
  10/21/2026 03 PM PDT           38.05            526         0              Normal
  10/21/2026 04 PM PDT           38.05            526         0              Normal
  10/21/2026 05 PM PDT           38.10            542         +              Normal
  10/21/2026 06 PM PDT           38.17            565         +              Normal
  10/21/2026 07 PM PDT           38.24            588         +              Normal
  10/21/2026 08 PM PDT           38.30            608         +              Normal
  10/21/2026 09 PM PDT           38.34            622         +              Normal
  10/21/2026 10 PM PDT           38.39            639         +              Normal
  10/21/2026 11 PM PDT           38.43            652         +              Normal
  10/22/2026 12 AM PDT           38.46            663         +              Normal
  10/22/2026 01 AM PDT           38.50            676         +              Normal
  10/22/2026 02 AM PDT           38.52            683         +              Normal
  10/22/2026 03 AM PDT           38.55            694         +              Normal
  10/22/2026 04 AM PDT           38.57            701         +              Normal
  10/22/2026 05 AM PDT           38.59            708         +              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.