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 Feet
Location: Stanislaus County in CaliforniaBulletin Group: San JoaquinRiver Group: San Joaquin
Action/Monitor: 50.5 FeetMinor Flood: 55.0 FeetModerate Flood: 66.0 FeetMajor Flood: 67.0 Feet

Observed Data Credit
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Raw streamflow data is provided by the US Geological Survey (USGS).
View US Geological Survey (USGS) Data for this station location.

Historical Mean Daily Stage/Flow Data
Water Year
Peak Discharge (cfs)
Stage (feet)
Date
 Most Recent 5 Years
2025* 1,420 40.56 Mar 19, 2025
2024* 5,750 48.86 Mar 3, 2024
2023* 10,800 54.79 Mar 31, 2023
2022* 1,710 41.32 Apr 17, 2022
2021* 2,220 42.45 Apr 16, 2021
 Historical High Stage/Flow Events (Period of Record - February 1895 to Present)** - Ranked by Flow
1951* 57,000 69.19 Dec 9, 1950
1997* 55,800 71.21*** Jan 4, 1997
1956* 37,600 66.43 Dec 25, 1955
1969* 32,600 65.42 Jan 27, 1969
1895 19,600 20.70 Feb 13, 1895
1940* 18,200 63.10 Mar 27, 1940
 * Discharge affected to unknown degree by regulation or diversion
 ** Most recent continuous record back to 1943 with segmented periods back to Feb 1895
 *** Backwater effect caused by debris on railroad trestle 1500 ft downstream of gage
Location Photographs
ESRI™ Locator Map
Flood Impacts
67.0 FeetExtensive flooding occurs. Flows in excess of 40,000 cfs could cause extensive damage to residential, industrial and commercial development in Modesto downstream of gage.
55.0 FeetThis is channel capacity through downtown Modesto.
Official 7 Day National Weather Service Forecast   (CAZ019)
Tonight: Mostly clear. Patchy fog in the late evening and overnight. Lows 37 to 43. Light winds.

Friday: Partly cloudy in the morning then clearing. Patchy fog in the morning. Highs around 56. Light winds.

Friday Night: Mostly clear. Patchy fog after midnight. Lows 40 to 46. Light winds.

Saturday: Patchy fog in the morning. Mostly sunny. Highs around 59. Light winds.

Saturday Night: Mostly clear. Patchy fog. Lows 41 to 47. Light winds.

Sunday: Mostly cloudy. Patchy fog. Highs around 59.

Sunday Night: Partly cloudy. Patchy fog. Lows around 44.

Monday and Monday Night: Partly cloudy. Patchy fog. Highs around 58. Lows 41 to 47.

Tuesday: Mostly cloudy. Patchy fog. Highs around 59.

Tuesday Night: Partly cloudy. Patchy fog. Lows 43 to 49.

Wednesday: Mostly cloudy. Patchy fog. Highs 57 to 63.

Wednesday Night: Mostly clear. Patchy fog. Lows 43 to 49.

Thursday: Partly cloudy. Patchy fog. Highs 58 to 64.
Product Disclaimer

This river graphic is not intended to serve as a substitute for official flood watches, warnings, advisories, or statements issued by the NWS Sacramento Weather Forecast Office. Observations are preliminary and subject to change. River levels identified as "forecast" should be consistent with those contained in official NWS products. River levels identified as "guidance" have significant uncertainty due to future weather or reservoir regulation and are provided for planning purposes only.