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
2023*
11,100
11.73
Jan 16, 2023
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
 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: Partly cloudy. Highs 70 to 75. Areas of winds south 10 to 15 mph.

Tonight: Partly cloudy in the evening and becoming cloudy. Lows 56 to 61. Areas of winds south 10 mph.

Tuesday: Mostly cloudy in the morning and becoming partly cloudy. Highs 72 to 77. Areas of winds south 10 mph.

Tuesday Night: Partly cloudy in the evening and becoming cloudy. Lows 56 to 60. Areas of winds south 10 mph in the evening becoming light.

Juneteenth: Cloudy in the morning and becoming partly cloudy. Highs 71 to 76. Areas of winds south 10 mph.

Wednesday Night: Partly cloudy in the evening and becoming cloudy. Lows 56 to 60.

Thursday: Cloudy in the morning and becoming partly cloudy. Patchy fog in the morning. Highs 69 to 74 near the coast to 74 inland.

Thursday Night: Partly cloudy in the evening and becoming cloudy. Lows 56 to 61.

Friday: Cloudy in the morning and becoming partly cloudy. Patchy fog in the morning. Highs 70 to 75 near the coast to 76 inland.

Friday Night: Partly cloudy in the evening and becoming cloudy. Lows around 60.

Saturday: Cloudy in the morning and becoming partly cloudy. Patchy fog in the morning. Highs 71 to 76 near the coast to 79 inland.

Saturday Night: Partly cloudy in the evening and becoming cloudy. Lows 60 to 64.

Sunday: Cloudy in the morning and becoming partly cloudy. Patchy fog in the morning. Highs 72 to 77 near the coast to 80 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.