CNRFC - Hydrology - Observed River/Reservoir Conditions

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

Monitor Stage: 8.2 Feet

Flood Stage: 11.2 Feet

Plot Type:

Observed Data Credit
	Raw streamflow data is provided by the US Geological Survey (USGS). View USGS Data for this station location.

Historical Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2022*	4,270	9.37	Dec 24, 2021
2021*	1,120	7.31	Dec 29, 2020
2020*	6,680	10.78	Apr 10, 2020
2019*	29,500	15.07	Feb 14, 2019
2018*	1,830	7.18	Jan 10, 2018
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

Impacts - E19 Information
8.2 Feet	Personnel begin regular patrols along the levee.
11.2 Feet	Vandegrift Road has begun to flood downstream of the gage. Stuart Mesa Road closures can be expected.
13.3 Feet	Vandegrift Road flooded for several miles downstream of the gage site. Stuart Mesa Road is flooded near the bridge.
16.0 Feet	Widespread inundation on Camp Pendleton with base evacuations likely. 01/16/1993 - flood of record.

Official 7 Day National Weather Service Forecast (CAZ043)

Tonight: Mostly cloudy. A slight chance of rain this evening, then a chance of rain overnight. Lows 49 to 55. Areas of winds west 10 mph. Chance of measurable precipitation 30 percent.

Friday: Cloudy. A chance of rain in the morning. Highs 62 to 65. Areas of winds west 10 to 15 mph. Gusts to 25 mph in the afternoon. Chance of measurable precipitation 40 percent.

Friday Night: Cloudy with a slight chance of rain in the evening, then partly cloudy overnight. Lows 51 to 56. Areas of winds west 10 to 15 mph. Gusts to 25 mph in the evening. Chance of measurable precipitation 20 percent.

Saturday: Partly cloudy. Highs 63 to 66 near the coast to 67 inland. Areas of winds south 10 to 15 mph.

Saturday Night: Partly cloudy. Patchy fog overnight. Lows 48 to 53. Areas of winds southwest 10 mph in the evening becoming light.

Sunday: Partly cloudy with patchy fog in the morning and becoming mostly sunny. Highs 66 to 70 near the coast to 71 inland.

Sunday Night: Mostly clear in the evening and becoming partly cloudy overnight with patchy fog. Lows 51 to 56.

Monday: Partly cloudy with patchy fog in the morning and becoming mostly sunny. Highs 67 to 72 near the coast to 72 inland.

Monday Night: Mostly clear in the evening and becoming mostly cloudy overnight with patchy fog. Lows 52 to 55.

Tuesday: Partly cloudy with patchy fog in the morning and Becoming mostly sunny. Highs 67 to 71 near the coast to 72 inland.

Tuesday Night: Partly cloudy. Patchy fog overnight. Lows 52 to 55.

Wednesday: Mostly cloudy with patchy fog in the morning and Becoming partly cloudy. Highs 67 to 71 near the coast to 72 inland.

Wednesday Night: Mostly clear in the evening and becoming partly cloudy overnight with patchy fog. Lows 52 to 56.

Thursday: Mostly cloudy with patchy fog in the morning and Becoming partly cloudy. Highs 67 to 71 near the coast to 71 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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