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
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)

Today: Partly cloudy in the morning then clearing. Highs 65 to 74. Northwest winds up to 10 mph. Gusts up to 25 mph in the afternoon.

Tonight: Clear. Lows 45 to 53. Northwest winds up to 15 mph. Gusts up to 25 mph in the evening.

Wednesday: Sunny, warmer. Highs 73 to 82. Northwest winds up to 10 mph. Gusts up to 20 mph in the afternoon.

Wednesday Night: Mostly clear. Lows 48 to 54. Northwest winds up to 15 mph.

Thursday: Sunny. Highs 79 to 87. Northwest winds up to 10 mph. Gusts up to 20 mph in the afternoon.

Thursday Night: Partly cloudy. Lows 53 to 59.

Friday: Partly cloudy. Highs 77 to 86.

Friday Night and Saturday: Partly cloudy. Lows 51 to 57. Highs 72 to 82.

Saturday Night and Sunday: Mostly clear. Lows 49 to 55. Highs 69 to 79.

Sunday Night and Monday: Clear. Lows 51 to 59. Highs 75 to 85.

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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