CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

SANTA MARGARITA RIVER - YSIDORA (YDRC1)

Latitude: 33.31º N	Longitude: 117.35º W	Elevation: 75 Feet
Location: San Diego County in California		Bulletin Group: Southern California		River Group: San Diego/Inland

Issuance Time:

May 02 2025 at 7:46 AM PDT

Next Issuance:

May 03 2025 at 9:00 AM PDT

Action/Monitor: 8.2 Feet

Minor Flood: 11.2 Feet

Moderate Flood: 13.3 Feet

Major Flood: 16.0 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*	8,250	11.26	Mar 31, 2024
2023*	11,100	11.73	Jan 16, 2023
2022*	4,270	9.37	Dec 24, 2021
2021*	1,120	7.31	Dec 29, 2020
2020*	6,680	10.78	Apr 10, 2020
Historical High Stage/Flow Events (Period of Record - Sep 2001 to Present)** - Ranked by Flow
1993*	44,000***	20.47***	Jan 16, 1993
1927	33,600****	18.00	Feb 16, 1927
2017*	31,200	14.60	Jan 22, 2017
1938	31,000	12.70	Mar 3, 1938
2019*	29,500	15.07	Feb 14, 2019
2005*	25,600***	13.5***	Jan 11, 2005
1980*	24,000***	18.80	Feb 18, 1980

* Discharge affected by regulation or diversion
** Most recent continuous record back to Sep 2001 with segmented periods back to Feb 1923
*** Estimated value
**** Highest flow since regulation by Skinner Reservoir began in 1974

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
16.0 Feet	Major flood, 37,000 cfs. Widespread inundation of Camp Pendleton with evacuations likely. Flood of Record Jan 16, 1993.
13.33 Feet	Moderate flood stage, 17,000 cfs. Vandegrift Road is flooded for several miles downstream of the gage site. Stuart Mesa Road is flooded near the bridge.
11.16 Feet	Minor flood stage, 8,000 cfs. Vandegrift Road has begun to flood downstream of the gage. Stuart Mesa Road closures can be expected.
8.18 Feet	2,500 cfs. The river has reached monitor stage. Personnel begin regular patrols along the levee.

Official 7 Day National Weather Service Forecast (CAZ043)

Today: Cloudy this morning and becoming partly cloudy. Highs 62 to 65 near the coast to 66 inland. Areas of winds northwest to 10 mph becoming west this afternoon.

Tonight: Cloudy. Lows 53 to 57. Areas of winds west 10 mph in the evening becoming light.

Saturday: Cloudy with patchy drizzle in the morning, then partly cloudy in the afternoon. Highs around 62 near the coast to 66 inland. Areas of winds south 10 to 15 mph.

Saturday Night: Mostly cloudy. A slight chance of showers overnight. Lows 50 to 54. Areas of winds west 10 to 15 mph with gusts to 25 mph. Chance of measurable precipitation 20 percent.

Sunday: Mostly cloudy. A chance of showers. Highs 60 to 63. Areas of winds southwest 10 to 15 mph with gusts to 25 mph. Chance of measurable precipitation 30 percent.

Sunday Night: Mostly cloudy with a slight chance of showers. Lows 49 to 54.

Monday: Cloudy in the morning and becoming partly cloudy. Highs 62 to 65.

Monday Night: Partly cloudy. Lows 49 to 54.

Tuesday: Partly cloudy. Highs 66 to 71.

Tuesday Night: Mostly clear. Lows 50 to 54.

Wednesday: Mostly sunny. Highs around 70 near the coast to 72 to 75 inland.

Wednesday Night: Mostly clear in the evening and becoming partly cloudy. Lows 51 to 56.

Thursday: Partly cloudy in the morning and becoming mostly sunny. Highs 69 to 72 near the coast to 74 to 78 inland.

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 Diego 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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