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
Issuance Time: May 18 2021 at 8:10 AM PDTNext Issuance: May 19 2021 at 9:00 AM PDT
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.

Verification - Historical Graphical RVF
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Historical Stage/Flow Data
Water Year
Peak Discharge (cfs)
Stage (feet)
Date
 Most Recent 5 Years
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
2016*
1,060
7.14
Jan 7, 2016
 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
ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ043)
Today: Low clouds and drizzle in the morning then partly cloudy. Highs 64 to 69 near the coast to 70 inland. Light winds.

Tonight: Partly cloudy in the evening then low clouds. Lows 53 to 58. Light winds.

Wednesday: Areas of low clouds in the morning then partly cloudy. Highs 66 to 71 near the coast to 71 to 76 inland. Light winds.

Wednesday Night: Partly cloudy in the evening then low clouds. Lows 53 to 58. Light winds.

Thursday: Low clouds in the morning then partly cloudy. Highs 64 to 69. Light winds becoming southwest 15 mph in the afternoon.

Thursday Night: Partly cloudy in the evening then low clouds and drizzle. Lows 52 to 57.

Friday: Low clouds and drizzle in the morning then partly cloudy. Highs around 66.

Friday Night: Partly cloudy in the evening then low clouds. Lows 50 to 55.

Saturday: Low clouds in the morning then partly cloudy. Highs 64 to 69.

Saturday Night: Partly cloudy in the evening then low clouds. Lows 50 to 55.

Sunday: Low clouds in the morning then mostly sunny. Highs 65 to 70 near the coast to 69 to 74 inland.

Sunday Night: Mostly clear in the evening then low clouds. Lows 52 to 57.

Monday: Low clouds in the morning then mostly sunny. Highs 67 to 72 near the coast to 75 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.