CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

SAN JOAQUIN RIVER - NEWMAN (NWMC1)

Latitude: 37.35º N	Longitude: 120.98º W	Elevation: 90 Feet
Location: Merced County in California		Bulletin Group: San Joaquin		River Group: San Joaquin

Issuance Time:

Dec 26 2025 at 9:01 AM PST

Next Issuance:

Dec 26 2025 at 3:00 PM PST

Action/Monitor: 63.0 Feet

Minor Flood: 69.4 Feet

Moderate Flood: 70.7 Feet

Major Flood: 71.7 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
Note: Water Year 2025 is currently showing peak daily mean values. These will be updated to instantaneous peaks in the coming months.
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2025*	4,630	58.49	Mar 21, 2025
2024*	5,330	59.44	Mar 6, 2024
2023*	19,800	65.93	Mar 17, 2023
2022*	1,260	51.74	Dec 30, 2021
2021*	1,760	53.26	Feb 1, 2021
Historical High Stage/Flow Events (Period of Record - Apr 1912 to Present) - Ranked by Flow
1997*	36,200	66.14	Jan 28, 1997
1938*	33,000	18.50	Mar 07, 1938
1983*	30,700	65.78	Mar 04, 1983
1969*	28,000	65.90	Feb 26, 1969
2006*	24,600	66.26	Apr 09, 2006
1980*	23,500	65.26	Feb 25, 1980
* Discharge affected by regulation or diversion

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
71.7 Feet	Top of levee rb
70.4 Feet	Danger stage.
70.0 Feet	Flood water reaches the top of the levee that surrounds the Newman waste water treatment plant.
69.4 Feet	Project flood stage.
66.26 Feet	Peak stage of record. 4/9/2006
66.14 Feet	1/28/1997
65.0 Feet	The fisherman's bend trailer park north of hills ferry road begins to flood.
64.0 Feet	The Wastewater Treatment Plant begins taking on river water and flood pumping begins.
63.6 Feet	Sand slough will flow.
63.0 Feet	Monitor stage. Levee patrols required.
62.0 Feet	Water seepage begins outside the levee along the river, near the newman waste water treatment plant.
55.0 Feet	The city of Newman Wastewater Treatment Plant (WWTP) begins to flood at the lowest point. Newman Police Department shooting range a the WWTP is also affected.

Official 7 Day National Weather Service Forecast (CAZ302)

Tonight: Mostly cloudy with a 50 percent chance of rain. Lows in the mid 40s. South winds up to 5 mph.

Saturday: Mostly sunny. Highs in the lower 50s. Northwest winds up to 10 mph.

Saturday Night: Partly cloudy in the evening then becoming mostly cloudy. Lows around 40. Northwest winds up to 5 mph.

Sunday: Mostly cloudy in the morning then clearing. Highs in the upper 40s. Northwest winds up to 5 mph.

Sunday Night: Partly cloudy. Lows in the mid 30s. Northwest winds up to 5 mph.

Monday through Tuesday Night: Partly cloudy. Highs in the upper 40s. Lows in the upper 30s.

Wednesday: Mostly cloudy. Highs around 50.

Wednesday Night: Cloudy with a 40 percent chance of rain. Near steady temperature in the mid 40s.

New Years Day and Thursday Night: Cloudy with a 50 percent chance of rain. Highs around 50. Lows in the mid 40s.

Friday: Partly sunny with a 50 percent chance of rain. Highs in the lower 50s.

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 San Joaquin Valley-Hanford 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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Verification - Historical Graphical RVF
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