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
2022*
4,270
9.37
Dec 24, 2021
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
 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
ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ043)
Today: Mostly cloudy. A chance of rain this afternoon. Highs around 65. Light winds becoming west 10 mph this afternoon. Chance of measurable precipitation 30 percent.

Tonight: Mostly cloudy. A chance of rain. Lows 50 to 54. Light winds. Chance of measurable precipitation 30 percent.

Tuesday: Mostly cloudy with a slight chance of showers in the morning, then partly cloudy in the afternoon. Highs around 66. Areas of winds south to 10 mph becoming west 10 mph in the afternoon. Chance of measurable precipitation 20 percent.

Tuesday Night: Partly cloudy. Lows 45 to 50. Areas of winds north 10 mph in the evening becoming light.

Wednesday: Mostly sunny. Highs 64 to 67 near the coast to 68 inland. Light winds becoming west 10 mph in the afternoon.

Wednesday Night: Mostly clear in the evening and becoming partly cloudy. Lows 47 to 51.

Thursday: Partly cloudy in the morning and becoming mostly sunny. Highs 65 to 68.

Thursday Night: Partly cloudy. Lows 48 to 52.

Friday: Mostly cloudy in the morning and becoming partly cloudy. Highs around 64.

Friday Night: Partly cloudy in the evening, then mostly cloudy with a slight chance of rain overnight. Lows around 50.

Saturday: Cloudy with rain likely in the morning, then mostly cloudy with a chance of rain in the afternoon. Highs 60 to 63.

Saturday Night: Mostly cloudy with a chance of showers. Lows 43 to 49.

Sunday: Partly cloudy. A chance of showers. Highs 57 to 61.
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.