CNRFC - Hydrology - Observed River/Reservoir Conditions

TUOLUMNE RIVER - MODESTO (MDSC1)

Latitude: 37.63º N	Longitude: 120.99º W	Elevation: 60 Feet
Location: Stanislaus County in California		Bulletin Group: San Joaquin		River Group: San Joaquin

Action/Monitor: 50.5 Feet

Minor Flood: 55.0 Feet

Moderate Flood: 66.0 Feet

Major Flood: 67.0 Feet

Plot Type:

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

Historical Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2023*	10,800	54.79	Mar 31, 2023
2022*	1,710	41.32	Apr 17, 2022
2021*	2,220	42.45	Apr 16, 2021
2020*	1,410	40.39	Dec 4, 2019
2019*	7,210	50.66	Mar 8, 2019
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
* 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
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Impacts - E19 Information
67.0 Feet	Extensive 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 Feet	This is channel capacity through downtown Modesto.

Official 7 Day National Weather Service Forecast (CAZ019)

Today: Mostly sunny. Widespread fog and locally dense in the morning. Haze through the day. Highs around 63. Light winds.

Tonight: Mostly cloudy in the evening then becoming partly cloudy. Haze and patchy fog through the night. Lows 39 to 49. Light winds.

Sunday: Mostly cloudy in the morning then becoming partly cloudy. Haze and widespread fog and locally dense in the morning. Highs 58 to 64. Northwest winds up to 10 mph.

Sunday Night: Mostly clear. Colder. Lows 34 to 44. Light winds.

Monday: Mostly sunny. Highs around 58. Northwest winds up to 10 mph.

Monday Night: Clear. Lows 33 to 43.

Tuesday: Mostly sunny. Highs 56 to 62.

Tuesday Night: Mostly cloudy. Lows 35 to 45.

Wednesday and Wednesday Night: Partly cloudy. Highs around 59. Lows 36 to 46.

Thursday and Thursday Night: Partly cloudy with a slight chance of rain showers. Highs around 59. Lows 38 to 46.

Friday: Mostly cloudy with a chance of rain showers. Highs 54 to 60.

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.

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