National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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SANTA MARGARITA RIVER - YSIDORA (YDRC1)
Latitude: 33.31º NLongitude: 117.35º WElevation: 75 Feet
Location: San Diego County in CaliforniaRiver Group: Southern California
Monitor Stage: 8.2 FeetFlood Stage: 11.2 Feet

Observed Data Credit
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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
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
2014*
2,230
7.76
Mar 1, 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
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
ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ043)
Today: Partly cloudy. Highs 73 to 78 near the coast to 80 inland. Light winds.

Tonight: Partly cloudy. Lows 47 to 53. Light winds.

Saturday: Partly cloudy. Patchy fog in the morning. Cooler. Highs around 65 near the coast to 69 inland. Light winds.

Saturday Night: Partly cloudy in the evening and becoming mostly cloudy. Lows 48 to 53. Light winds.

Sunday: Mostly cloudy with a slight chance of showers. Highs around 59. Areas of winds southwest 15 mph. Gusts to 25 mph in the afternoon. Chance of measurable precipitation 20 percent.

Sunday Night: Mostly cloudy in the evening and becoming partly cloudy. Chance of showers. Lows 41 to 46.

Monday: Partly cloudy with a slight chance of showers in the morning, then mostly sunny in the afternoon. Highs 60 to 65.

Monday Night: Mostly clear. Lows 41 to 46.

Tuesday: Sunny. Highs around 64 near the coast to 67 inland.

Tuesday Night: Mostly clear. Lows 43 to 48.

Wednesday: Partly cloudy in the morning and becoming mostly sunny. Highs 63 to 68 near the coast to 69 inland.

Wednesday Night: Mostly clear in the evening and becoming partly cloudy. Lows 45 to 50.

Thursday: Partly cloudy. Highs 65 to 70 near the coast to 70 inland.
Impacts - E19 Information
8.2 FeetPersonnel begin regular patrols along the levee.
11.2 FeetVandegrift Road has begun to flood downstream of the gage. Stuart Mesa Road closures can be expected.
13.3 FeetVandegrift Road flooded for several miles downstream of the gage site. Stuart Mesa Road is flooded near the bridge.
16.0 FeetWidespread 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.