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)

Tonight: Partly cloudy. Lows around 67. Light winds.

Tuesday: Partly cloudy. Highs 76 to 81 near the coast to 82 to 87 inland. Light winds.

Tuesday Night: Partly cloudy. Lows 64 to 69. Light winds.

Wednesday: Partly cloudy in the morning and becoming mostly sunny. Highs 77 to 82 near the coast to 83 to 88 inland. Light winds.

Wednesday Night: Partly cloudy. Lows around 68. Light winds.

Thursday: Partly cloudy. Highs 78 to 83 near the coast to 84 to 89 inland.

Thursday Night: Partly cloudy. Lows 66 to 71.

Friday: Partly cloudy. Slight chance of showers and thunderstorms in the afternoon. Highs 77 to 82 near the coast to 83 to 88 inland.

Friday Night: Partly cloudy. Patchy fog overnight. Lows 66 to 71.

Saturday: Partly cloudy in the morning and becoming mostly sunny. Patchy fog in the morning. Highs 77 to 82 near the coast to 83 to 88 inland.

Saturday Night: Partly cloudy. Patchy fog overnight. Lows 66 to 71.

Sunday: Partly cloudy. Patchy fog in the morning. Highs 77 to 82 near the coast to 83 to 88 inland.

Sunday Night: Partly cloudy. Patchy fog overnight. Lows 65 to 70.

Monday: Partly cloudy. Highs 76 to 81 near the coast to 81 to 86 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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