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:

Apr 29 2025 at 8:37 AM PDT

Next Issuance:

Apr 30 2025 at 9:00 AM PDT

Action/Monitor: 50.5 Feet

Minor Flood: 55.0 Feet

Moderate Flood: 66.0 Feet

Major Flood: 67.0 Feet

Plot Type:

Please Note:
1) 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.

2) At extremely low river flows, the "Observed (Raw Data)" may show readings below the lower end of the available rating table, while the "Observed (Simulated)" will only show values at the bottom of the rating table, creating a potential discrepancy between the two readings.

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
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
2020*	1,410	40.39	Dec 4, 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)

Tonight: Mostly clear in the evening then becoming mostly cloudy. Lows 51 to 59. Northwest winds up to 10 mph.

Wednesday: Mostly cloudy in the morning then clearing. Highs 77 to 85. Northwest winds up to 10 mph.

Wednesday Night: Clear. Lows 52 to 58. Northwest winds up to 10 mph.

Thursday: Sunny. Highs 77 to 85. Northwest winds up to 10 mph.

Thursday Night: Clear. Lows 50 to 56. Northwest winds up to 10 mph.

Friday: Sunny. Highs 74 to 83.

Friday Night: Mostly cloudy. Lows 49 to 56.

Saturday: Mostly cloudy with a slight chance of rain showers. Highs 59 to 69.

Saturday Night and Sunday: Partly cloudy with a slight chance of rain showers. Lows 44 to 52. Highs 60 to 70.

Sunday Night through Monday Night: Mostly clear. Lows 46 to 55. Highs 63 to 73.

Tuesday: Sunny, warmer. Highs 71 to 81.

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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