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: Oct 17 2021 at 7:33 AM PDTNext Issuance: Oct 18 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)** - 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)
Tonight: Partly cloudy in the evening, then mostly cloudy with a slight chance of rain overnight. Lows 52 to 57. Light winds. Chance of measurable precipitation 20 percent.

Monday: Mostly cloudy with a chance of rain in the morning, then partly cloudy with a slight chance of rain in the afternoon. Highs 64 to 69. Light winds. Chance of measurable precipitation 40 percent.

Monday Night: Partly cloudy. Cooler. Lows 45 to 50. Light winds.

Tuesday: Partly cloudy in the morning and becoming mostly sunny. Highs 65 to 70. Light winds.

Tuesday Night: Partly cloudy. Patchy fog overnight. Lows 47 to 52. Light winds.

Wednesday: Partly cloudy. Patchy fog in the morning. Highs 68 to 73.

Wednesday Night: Partly cloudy. Patchy fog overnight. Lows 50 to 55.

Thursday: Partly cloudy. Patchy fog in the morning. Highs 68 to 73 near the coast to 72 to 77 inland.

Thursday Night: Partly cloudy. Patchy fog overnight. Lows 51 to 56.

Friday: Partly cloudy. Patchy fog in the morning. Highs 67 to 72 near the coast to 71 to 76 inland.

Friday Night: Partly cloudy in the evening and becoming cloudy. Patchy fog overnight. Lows 52 to 57.

Saturday: Mostly cloudy in the morning and becoming cloudy. Patchy fog in the morning. Highs 64 to 69 near the coast to 70 inland.

Saturday Night: Partly cloudy in the evening and becoming mostly cloudy. Slight chance of rain. Lows 52 to 57.

Sunday: Mostly cloudy. Highs 66 to 71.
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.