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		River Group: Southern California

Monitor Stage: 8.2 Feet

Flood Stage: 11.2 Feet

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
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
2017*	31,200	14.60	Jan 22, 2017
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

Official 7 Day National Weather Service Forecast (CAZ043)

Today: Mostly sunny. Highs around 65 near the coast to 68 inland. Light winds becoming northwest 10 mph this afternoon.

Tonight: Partly cloudy. Lows 42 to 48. Areas of winds northwest 10 mph.

Sunday: Mostly cloudy in the morning and becoming partly cloudy. A slight chance of showers. Highs 62 to 65. Areas of winds northwest 10 to 15 mph. Gusts to 30 mph in the afternoon. Chance of precipitation 20 percent.

Sunday Night: Partly cloudy. Lows 38 to 46. Areas of winds northwest 10 to 15 mph with gusts to 25 mph.

Monday: Mostly sunny. Highs 62 to 65 near the coast to 65 inland. Areas of winds northwest 10 mph.

Monday Night: Clear. Lows 38 to 45.

Tuesday: Sunny. Highs 66 to 69 near the coast to 69 inland.

Tuesday Night: Clear. Lows 39 to 46.

Wednesday: Mostly sunny. Highs 66 to 69 near the coast to 71 inland.

Wednesday Night: Mostly clear. Lows 41 to 48.

Thursday: Mostly sunny. Highs around 71 near the coast to 74 inland.

Thursday Night: Mostly clear. Lows 44 to 51.

Friday: Mostly sunny. Breezy. Highs around 72 near the coast to 75 inland.

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.

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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