CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

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

Issuance Time:

Jan 24 2025 at 1:21 PM PST

Next Issuance:

Jan 25 2025 at 9:00 AM PST

Action/Monitor: 50.5 Feet

Minor Flood: 55.0 Feet

Moderate Flood: 66.0 Feet

Major Flood: 67.0 Feet

Plot Type:

Please Note: Each individual timeseries plotted on the graphical river forecast can be toggled on and off by clicking the legend entry above. If the "Observed (Raw Data)" contains bad data and is toggled off, the plot will scale to the remaining timeseries.

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

Flood Impacts
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 until late afternoon, then partly cloudy with a chance of rain showers late in the afternoon. Highs 49 to 57. West winds up to 10 mph with gusts to around 20 mph.

Tonight: Mostly cloudy with a chance of rain showers. Lows 37 to 43. Southwest winds around 10 mph shifting to the southeast after midnight.

Sunday: Mostly cloudy. A chance of rain showers in the morning, then a slight chance of rain showers in the afternoon. Highs 49 to 57. Northeast winds around 10 mph with gusts to around 20 mph.

Sunday Night: Partly cloudy with a slight chance of rain showers. Lows 31 to 37. Northwest winds up to 10 mph. Gusts up to 25 mph after midnight.

Monday: Areas of frost in the morning. Sunny. Highs 51 to 58. Northwest winds up to 10 mph.

Monday Night: Clear. Lows 31 to 37.

Tuesday: Sunny. Areas of frost. Highs 54 to 59.

Tuesday Night and Wednesday: Clear. Areas of frost. Lows 30 to 38. Highs 54 to 60.

Wednesday Night: Clear. Lows 32 to 40.

Thursday: Mostly sunny. Patchy frost. Highs 56 to 62.

Thursday Night: Mostly cloudy. Lows 40 to 46.

Friday: Mostly cloudy with a chance of rain. Highs 55 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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