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

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
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: Cloudy with a slight chance of rain. Highs around 61. Areas of winds west 10 to 15 mph. Chance of precipitation 20 percent.

Tonight: Cloudy. Rain likely overnight. Lows 47 to 52. Areas of winds south 10 to 20 mph. Gusts to 30 mph overnight. Chance of precipitation 70 percent.

Tuesday: Rain. Rain may be heavy at times. Highs around 59. Areas of winds south 25 to 35 mph. Gusts to 55 mph and becoming 50 mph in the afternoon.

Tuesday Night: A slight chance of thunderstorms. Showers. Locally heavy rainfall possible in the evening. Lows 46 to 50. Areas of winds southwest 20 to 30 mph. Gusts to 45 mph and becoming 40 mph overnight.

Wednesday: Mostly cloudy with a slight chance of thunderstorms. Showers likely. Highs around 58. Areas of winds west 15 to 20 mph with gusts to 30 mph. Chance of precipitation 70 percent.

Wednesday Night: Partly cloudy in the evening and becoming mostly cloudy. A slight chance of showers. Lows 43 to 49.

Thursday: Partly cloudy. Highs around 61.

Thursday Night: Partly cloudy. Lows 42 to 47.

Friday: Partly cloudy. Highs around 63.

Friday Night: Mostly clear in the evening and becoming partly cloudy. Lows 41 to 46.

Saturday: Partly cloudy in the morning and becoming mostly sunny. Highs 61 to 64.

Saturday Night: Mostly clear. Lows 40 to 45.

Sunday: Mostly sunny. Highs 62 to 65.

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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