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
2019*	29,500	15.07	Feb 14, 2019
2018*	1,830	7.18	Jan 10, 2018
2017*	31,200	14.60	Jan 22, 2017
2016*	1,060	7.14	Jan 7, 2016
2015*	1,550	7.15	Dec 4, 2014
Historical High Stage/Flow Events (Period of Record - Sep 2001 to Present)**
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. Patchy dense fog overnight. Local visibility one quarter mile or less at times overnight. Lows 53 to 59. Light winds.

Sunday: Partly cloudy. Patchy dense fog in the morning. Local visibility one quarter mile or less at times in the morning. Warmer. Highs 77 to 82 near the coast to 84 to 89 inland. Light winds.

Sunday Night: Mostly clear. Lows 52 to 59. Light winds.

Monday: Mostly sunny. Highs 75 to 80 near the coast to 82 to 87 inland. Light winds.

Monday Night: Mostly clear in the evening and becoming partly cloudy. Patchy fog overnight. Lows 52 to 59. Light winds.

Tuesday: Partly cloudy. Patchy fog in the morning. Highs 72 to 77 near the coast to 80 inland.

Tuesday Night: Partly cloudy. Patchy fog overnight. Lows 50 to 58.

Wednesday: Partly cloudy. Patchy fog in the morning. Highs 74 to 79 near the coast to 81 to 86 inland.

Wednesday Night: Mostly clear. Lows 51 to 60.

Thursday: Mostly sunny. Highs 80 to 85 near the coast to 86 to 91 inland.

Thursday Night: Mostly clear in the evening and becoming partly cloudy. Lows 52 to 61.

Friday: Partly cloudy in the morning and becoming mostly sunny. Highs 74 to 79 near the coast to 82 inland.

Friday Night: Partly cloudy in the evening, then mostly cloudy with a slight chance of showers overnight. Lows 54 to 59.

Saturday: Mostly cloudy. Slight chance of showers in the morning, then chance of showers in the afternoon. Highs 65 to 70 near the coast to 71 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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