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: May 11 2026 at 8:22 AM PDTNext Issuance: May 12 2026 at 9:00 AM 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:  05/11/2026 at 08:23 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  05/06/2026 at 08:00 AM PDT
# Maximum Observed Stage:                       37.34 Feet
# Maximum Observed Flow:                        321 cfs
#
# Earliest Date & Time of Maximum Forecast:     05/14/2026 at 08:00 PM PDT
# Maximum Forecast Stage:                       36.89 Feet
# Maximum Forecast Flow:                        204 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  05/06/2026 08 AM PDT           37.34            321                        Normal
  05/06/2026 09 AM PDT           37.32            315         -              Normal
  05/06/2026 10 AM PDT           37.30            310         -              Normal
  05/06/2026 11 AM PDT           37.30            310         0              Normal
  05/06/2026 12 PM PDT           37.29            307         -              Normal
  05/06/2026 01 PM PDT           37.28            304         -              Normal
  05/06/2026 02 PM PDT           37.28            304         0              Normal
  05/06/2026 03 PM PDT           37.27            301         -              Normal
  05/06/2026 04 PM PDT           37.27            301         0              Normal
  05/06/2026 05 PM PDT           37.27            301         0              Normal
  05/06/2026 06 PM PDT           37.26            299         -              Normal
  05/06/2026 07 PM PDT           37.26            299         0              Normal
  05/06/2026 08 PM PDT           37.25            296         -              Normal
  05/06/2026 09 PM PDT           37.24            293         -              Normal
  05/06/2026 10 PM PDT           37.23            291         -              Normal
  05/06/2026 11 PM PDT           37.23            291         0              Normal
  05/07/2026 12 AM PDT           37.23            291         0              Normal
  05/07/2026 01 AM PDT           37.22            288         -              Normal
  05/07/2026 02 AM PDT           37.21            285         -              Normal
  05/07/2026 03 AM PDT           37.20            283         -              Normal
  05/07/2026 04 AM PDT           37.19            280         -              Normal
  05/07/2026 05 AM PDT           37.18            277         -              Normal
  05/07/2026 06 AM PDT           37.17            275         -              Normal
  05/07/2026 07 AM PDT           37.16            272         -              Normal
  05/07/2026 08 AM PDT           37.15            270         -              Normal
  05/07/2026 09 AM PDT           37.14            267         -              Normal
  05/07/2026 10 AM PDT           37.13            264         -              Normal
  05/07/2026 11 AM PDT           37.14            267         +              Normal
  05/07/2026 12 PM PDT           37.12            262         -              Normal
  05/07/2026 01 PM PDT           37.12            262         0              Normal
  05/07/2026 02 PM PDT           37.11            259         -              Normal
  05/07/2026 03 PM PDT           37.11            259         0              Normal
  05/07/2026 04 PM PDT           37.12            262         +              Normal
  05/07/2026 05 PM PDT           37.12            262         0              Normal
  05/07/2026 06 PM PDT           37.14            267         +              Normal
  05/07/2026 07 PM PDT           37.12            262         -              Normal
  05/07/2026 08 PM PDT           37.11            259         -              Normal
  05/07/2026 09 PM PDT           37.09            254         -              Normal
  05/07/2026 10 PM PDT           37.08            251         -              Normal
  05/07/2026 11 PM PDT           37.06            246         -              Normal
  05/08/2026 12 AM PDT           37.05            244         -              Normal
  05/08/2026 01 AM PDT           37.04            241         -              Normal
  05/08/2026 02 AM PDT           37.03            239         -              Normal
  05/08/2026 03 AM PDT           37.02            236         -              Normal
  05/08/2026 04 AM PDT           37.02            236         0              Normal
  05/08/2026 05 AM PDT           37.01            234         -              Normal
  05/08/2026 06 AM PDT           37.00            231         -              Normal
  05/08/2026 07 AM PDT           37.01            234         +              Normal
  05/08/2026 08 AM PDT           37.00            231         -              Normal
  05/08/2026 09 AM PDT           37.00            231         0              Normal
  05/08/2026 10 AM PDT           37.00            231         0              Normal
  05/08/2026 11 AM PDT           36.99            229         -              Normal
  05/08/2026 12 PM PDT           36.99            229         0              Normal
  05/08/2026 01 PM PDT           36.99            229         0              Normal
  05/08/2026 02 PM PDT           36.98            226         -              Normal
  05/08/2026 03 PM PDT           36.98            226         0              Normal
  05/08/2026 04 PM PDT           36.98            226         0              Normal
  05/08/2026 05 PM PDT           36.97            224         -              Normal
  05/08/2026 06 PM PDT           36.97            224         0              Normal
  05/08/2026 07 PM PDT           36.97            224         0              Normal
  05/08/2026 08 PM PDT           36.97            224         0              Normal
  05/08/2026 09 PM PDT           36.96            221         -              Normal
  05/08/2026 10 PM PDT           36.96            221         0              Normal
  05/08/2026 11 PM PDT           36.97            224         +              Normal
  05/09/2026 12 AM PDT           36.97            224         0              Normal
  05/09/2026 01 AM PDT           36.97            224         0              Normal
  05/09/2026 02 AM PDT           36.96            221         -              Normal
  05/09/2026 03 AM PDT           36.95            219         -              Normal
  05/09/2026 04 AM PDT           36.95            219         0              Normal
  05/09/2026 05 AM PDT           36.96            221         +              Normal
  05/09/2026 06 AM PDT           36.95            219         -              Normal
  05/09/2026 07 AM PDT           36.96            221         +              Normal
  05/09/2026 08 AM PDT           36.96            221         0              Normal
  05/09/2026 09 AM PDT           36.97            224         +              Normal
  05/09/2026 10 AM PDT           36.96            221         -              Normal
  05/09/2026 11 AM PDT           36.97            224         +              Normal
  05/09/2026 12 PM PDT           36.97            224         0              Normal
  05/09/2026 01 PM PDT           36.96            221         -              Normal
  05/09/2026 02 PM PDT           36.95            219         -              Normal
  05/09/2026 03 PM PDT           36.95            219         0              Normal
  05/09/2026 04 PM PDT           36.94            216         -              Normal
  05/09/2026 05 PM PDT           36.94            216         0              Normal
  05/09/2026 06 PM PDT           36.94            216         0              Normal
  05/09/2026 07 PM PDT           36.93            214         -              Normal
  05/09/2026 08 PM PDT           36.93            214         0              Normal
  05/09/2026 09 PM PDT           36.93            214         0              Normal
  05/09/2026 10 PM PDT           36.93            214         0              Normal
  05/09/2026 11 PM PDT           36.92            212         -              Normal
  05/10/2026 12 AM PDT           36.91            209         -              Normal
  05/10/2026 01 AM PDT           36.91            209         0              Normal
  05/10/2026 02 AM PDT           36.90            207         -              Normal
  05/10/2026 03 AM PDT           36.89            204         -              Normal
  05/10/2026 04 AM PDT           36.89            204         0              Normal
  05/10/2026 05 AM PDT           36.89            204         0              Normal
  05/10/2026 06 AM PDT           36.89            204         0              Normal
  05/10/2026 07 AM PDT           36.88            202         -              Normal
  05/10/2026 08 AM PDT           36.88            202         0              Normal
  05/10/2026 09 AM PDT           36.89            204         +              Normal
  05/10/2026 10 AM PDT           36.89            204         0              Normal
  05/10/2026 11 AM PDT           36.89            204         0              Normal
  05/10/2026 12 PM PDT           36.89            204         0              Normal
  05/10/2026 01 PM PDT           36.89            204         0              Normal
  05/10/2026 02 PM PDT           36.88            202         -              Normal
  05/10/2026 03 PM PDT           36.88            202         0              Normal
  05/10/2026 04 PM PDT           36.88            202         0              Normal
  05/10/2026 05 PM PDT           36.88            202         0              Normal
  05/10/2026 06 PM PDT           36.87            199         -              Normal
  05/10/2026 07 PM PDT           36.87            199         0              Normal
  05/10/2026 08 PM PDT           36.87            199         0              Normal
  05/10/2026 09 PM PDT           36.86            197         -              Normal
  05/10/2026 10 PM PDT           36.85            195         -              Normal
  05/10/2026 11 PM PDT           36.85            195         0              Normal
  05/11/2026 12 AM PDT           36.84            192         -              Normal
  05/11/2026 01 AM PDT           36.84            192         0              Normal
  05/11/2026 02 AM PDT           36.86            197         +              Normal
  05/11/2026 03 AM PDT           36.88            202         +              Normal
  05/11/2026 04 AM PDT           36.88            202         0              Normal
  05/11/2026 05 AM PDT           36.87            199         -              Normal
  05/11/2026 06 AM PDT           36.87            199         0              Normal
  05/11/2026 07 AM PDT           36.87            199         0              Normal
  05/11/2026 08 AM PDT           36.87            199         0              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  05/11/2026 09 AM PDT           36.87            199                        Normal
  05/11/2026 10 AM PDT           36.87            199         0              Normal
  05/11/2026 11 AM PDT           36.87            199         0              Normal
  05/11/2026 12 PM PDT           36.87            199         0              Normal
  05/11/2026 01 PM PDT           36.87            199         0              Normal
  05/11/2026 02 PM PDT           36.87            199         0              Normal
  05/11/2026 03 PM PDT           36.87            199         0              Normal
  05/11/2026 04 PM PDT           36.87            199         0              Normal
  05/11/2026 05 PM PDT           36.87            199         0              Normal
  05/11/2026 06 PM PDT           36.87            199         0              Normal
  05/11/2026 07 PM PDT           36.87            199         0              Normal
  05/11/2026 08 PM PDT           36.87            199         0              Normal
  05/11/2026 09 PM PDT           36.87            199         0              Normal
  05/11/2026 10 PM PDT           36.87            199         0              Normal
  05/11/2026 11 PM PDT           36.87            199         0              Normal
  05/12/2026 12 AM PDT           36.87            199         0              Normal
  05/12/2026 01 AM PDT           36.87            199         0              Normal
  05/12/2026 02 AM PDT           36.87            199         0              Normal
  05/12/2026 03 AM PDT           36.87            199         0              Normal
  05/12/2026 04 AM PDT           36.87            199         0              Normal
  05/12/2026 05 AM PDT           36.88            202         +              Normal
  05/12/2026 06 AM PDT           36.88            202         0              Normal
  05/12/2026 07 AM PDT           36.88            202         0              Normal
  05/12/2026 08 AM PDT           36.88            202         0              Normal
  05/12/2026 09 AM PDT           36.88            202         0              Normal
  05/12/2026 10 AM PDT           36.88            202         0              Normal
  05/12/2026 11 AM PDT           36.88            202         0              Normal
  05/12/2026 12 PM PDT           36.88            202         0              Normal
  05/12/2026 01 PM PDT           36.88            202         0              Normal
  05/12/2026 02 PM PDT           36.88            202         0              Normal
  05/12/2026 03 PM PDT           36.88            202         0              Normal
  05/12/2026 04 PM PDT           36.88            202         0              Normal
  05/12/2026 05 PM PDT           36.88            202         0              Normal
  05/12/2026 06 PM PDT           36.88            202         0              Normal
  05/12/2026 07 PM PDT           36.88            202         0              Normal
  05/12/2026 08 PM PDT           36.88            202         0              Normal
  05/12/2026 09 PM PDT           36.88            202         0              Normal
  05/12/2026 10 PM PDT           36.88            202         0              Normal
  05/12/2026 11 PM PDT           36.88            202         0              Normal
  05/13/2026 12 AM PDT           36.88            202         0              Normal
  05/13/2026 01 AM PDT           36.88            202         0              Normal
  05/13/2026 02 AM PDT           36.88            202         0              Normal
  05/13/2026 03 AM PDT           36.88            202         0              Normal
  05/13/2026 04 AM PDT           36.88            202         0              Normal
  05/13/2026 05 AM PDT           36.88            202         0              Normal
  05/13/2026 06 AM PDT           36.88            202         0              Normal
  05/13/2026 07 AM PDT           36.88            202         0              Normal
  05/13/2026 08 AM PDT           36.88            202         0              Normal
  05/13/2026 09 AM PDT           36.88            202         0              Normal
  05/13/2026 10 AM PDT           36.88            202         0              Normal
  05/13/2026 11 AM PDT           36.88            202         0              Normal
  05/13/2026 12 PM PDT           36.88            202         0              Normal
  05/13/2026 01 PM PDT           36.88            202         0              Normal
  05/13/2026 02 PM PDT           36.88            202         0              Normal
  05/13/2026 03 PM PDT           36.88            202         0              Normal
  05/13/2026 04 PM PDT           36.88            202         0              Normal
  05/13/2026 05 PM PDT           36.88            202         0              Normal
  05/13/2026 06 PM PDT           36.88            202         0              Normal
  05/13/2026 07 PM PDT           36.88            202         0              Normal
  05/13/2026 08 PM PDT           36.88            202         0              Normal
  05/13/2026 09 PM PDT           36.88            202         0              Normal
  05/13/2026 10 PM PDT           36.88            202         0              Normal
  05/13/2026 11 PM PDT           36.88            202         0              Normal
  05/14/2026 12 AM PDT           36.88            202         0              Normal
  05/14/2026 01 AM PDT           36.88            202         0              Normal
  05/14/2026 02 AM PDT           36.88            202         0              Normal
  05/14/2026 03 AM PDT           36.88            202         0              Normal
  05/14/2026 04 AM PDT           36.88            202         0              Normal
  05/14/2026 05 AM PDT           36.88            202         0              Normal
  05/14/2026 06 AM PDT           36.88            202         0              Normal
  05/14/2026 07 AM PDT           36.88            202         0              Normal
  05/14/2026 08 AM PDT           36.88            202         0              Normal
  05/14/2026 09 AM PDT           36.88            202         0              Normal
  05/14/2026 10 AM PDT           36.88            202         0              Normal
  05/14/2026 11 AM PDT           36.88            202         0              Normal
  05/14/2026 12 PM PDT           36.88            202         0              Normal
  05/14/2026 01 PM PDT           36.88            202         0              Normal
  05/14/2026 02 PM PDT           36.88            202         0              Normal
  05/14/2026 03 PM PDT           36.88            202         0              Normal
  05/14/2026 04 PM PDT           36.88            202         0              Normal
  05/14/2026 05 PM PDT           36.88            202         0              Normal
  05/14/2026 06 PM PDT           36.88            202         0              Normal
  05/14/2026 07 PM PDT           36.88            202         0              Normal
  05/14/2026 08 PM PDT           36.89            204         +              Normal
  05/14/2026 09 PM PDT           36.89            204         0              Normal
  05/14/2026 10 PM PDT           36.89            204         0              Normal
  05/14/2026 11 PM PDT           36.89            204         0              Normal
  05/15/2026 12 AM PDT           36.89            204         0              Normal
  05/15/2026 01 AM PDT           36.89            204         0              Normal
  05/15/2026 02 AM PDT           36.89            204         0              Normal
  05/15/2026 03 AM PDT           36.89            204         0              Normal
  05/15/2026 04 AM PDT           36.89            204         0              Normal
  05/15/2026 05 AM PDT           36.89            204         0              Normal
  05/15/2026 06 AM PDT           36.89            204         0              Normal
  05/15/2026 07 AM PDT           36.89            204         0              Normal
  05/15/2026 08 AM PDT           36.89            204         0              Normal
  05/15/2026 09 AM PDT           36.89            204         0              Normal
  05/15/2026 10 AM PDT           36.89            204         0              Normal
  05/15/2026 11 AM PDT           36.89            204         0              Normal
  05/15/2026 12 PM PDT           36.89            204         0              Normal
  05/15/2026 01 PM PDT           36.89            204         0              Normal
  05/15/2026 02 PM PDT           36.89            204         0              Normal
  05/15/2026 03 PM PDT           36.89            204         0              Normal
  05/15/2026 04 PM PDT           36.89            204         0              Normal
  05/15/2026 05 PM PDT           36.89            204         0              Normal
  05/15/2026 06 PM PDT           36.89            204         0              Normal
  05/15/2026 07 PM PDT           36.89            204         0              Normal
  05/15/2026 08 PM PDT           36.89            204         0              Normal
  05/15/2026 09 PM PDT           36.89            204         0              Normal
  05/15/2026 10 PM PDT           36.89            204         0              Normal
  05/15/2026 11 PM PDT           36.89            204         0              Normal
  05/16/2026 12 AM PDT           36.89            204         0              Normal
  05/16/2026 01 AM PDT           36.89            204         0              Normal
  05/16/2026 02 AM PDT           36.89            204         0              Normal
  05/16/2026 03 AM PDT           36.89            204         0              Normal
  05/16/2026 04 AM PDT           36.89            204         0              Normal
  05/16/2026 05 AM PDT           36.89            204         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.