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: Partly cloudy. Isolated showers this evening. Lows 52 to 57. Areas of winds west to 10 mph this evening becoming light. Chance of measurable precipitation 20 percent.

Monday: Mostly sunny. Highs 70 to 74. Areas of winds northeast to 10 mph becoming northwest with gusts to 30 mph in the afternoon.

Monday Night: Mostly clear. Lows 55 to 59. Areas of winds northwest 10 to 15 mph with gusts to 30 mph in the evening becoming light.

Tuesday: Partly cloudy in the morning and becoming mostly sunny. Highs 71 to 76 near the coast to 75 to 78 inland. Light winds becoming west 10 to 15 mph in the afternoon.

Tuesday Night: Mostly clear. Lows 59 to 62. Areas of winds northwest to 10 mph in the evening becoming light.

Wednesday: Partly cloudy in the morning and becoming mostly sunny. Highs 75 to 80 near the coast to 83 inland.

Wednesday Night: Mostly clear. Lows around 62.

Thursday: Mostly sunny. Highs 81 to 86 near the coast to 87 to 91 inland.

Thursday Night: Mostly clear in the evening and becoming partly cloudy. Lows around 65.

Friday: Partly cloudy in the morning and becoming mostly sunny. Highs 80 to 85 near the coast to 88 to 92 inland.

Friday Night: Mostly clear in the evening and becoming partly cloudy. Lows 63 to 66.

Saturday: Partly cloudy. Highs 79 to 84 near the coast to 86 to 90 inland.

Saturday Night: Mostly clear in the evening and becoming partly cloudy. Lows 60 to 64.

Sunday: Partly cloudy. Highs 76 to 81 near the coast to 84 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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