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)

Tonight: Partly cloudy this evening, then mostly cloudy with patchy drizzle overnight. Patchy fog overnight. Lows in the lower 60s. Light winds.

Saturday: Patchy fog in the morning. Mostly cloudy with patchy drizzle in the morning, then partly cloudy in the afternoon. Highs in the mid 70s. Light winds.

Saturday Night: Partly cloudy in the evening and becoming mostly cloudy. Patchy fog overnight. Lows in the lower 60s. Light winds.

Sunday: Mostly cloudy in the morning and becoming partly cloudy. Patchy fog in the morning. Highs in the mid 70s. Light winds becoming west 15 mph in the afternoon.

Sunday Night: Partly cloudy in the evening and becoming mostly cloudy. Patchy fog overnight. Lows in the lower 60s. Light winds.

Monday: Cloudy in the morning and becoming mostly sunny. Patchy fog in the morning. Highs in the mid 70s near the coast to in the upper 70s inland.

Monday Night: Mostly clear in the evening and becoming partly cloudy. Patchy fog overnight. Lows in the mid 60s.

Tuesday: Mostly cloudy in the morning and becoming partly cloudy. Patchy fog in the morning. Highs in the upper 70s near the coast to in the lower 80s inland.

Tuesday Night: Mostly clear in the evening and becoming partly cloudy. Patchy fog overnight. Lows in the mid 60s.

Wednesday: Mostly cloudy in the morning and becoming partly cloudy. Patchy fog in the morning. Highs in the upper 70s near the coast to in the lower 80s inland.

Wednesday Night: Mostly clear in the evening and becoming partly cloudy. Patchy fog overnight. Lows in the mid 60s.

Thursday: Mostly cloudy in the morning and becoming mostly sunny. Patchy fog in the morning. Highs in the upper 70s near the coast to in the mid 80s inland.

Thursday Night: Mostly clear in the evening and becoming partly cloudy. Patchy fog overnight. Lows in the mid 60s.

Friday: Partly cloudy in the morning and becoming mostly sunny. Patchy fog in the morning. Highs in the lower 80s near the coast to in the mid 80s 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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