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

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MERCED RIVER - YOSEMITE NP AT HAPPY ISLES (HPIC1)
Latitude: 37.73º NLongitude: 119.56º WElevation: 4017 Feet
Location: Mariposa County in CaliforniaRiver Group: San Joaquin
Issuance Time: May 25 2019 at 8:47 AM PDTNext Issuance: May 26 2019 at 9:00 AM PDT
Monitor Stage: N/A Flood Stage: 8.0 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
2017
5,210
8.45
Jun 20, 2017
2016
2,490
6.30
May 14, 2016
2015
882
4.25
Feb 9, 2015
2014
1,190
4.71
May 16, 2014
2013
1,750
5.50
Apr 30, 2013
 Historical High Stage/Flow Events (Period of Record - Aug 1915 to Present)
1997
10,100
13.27
Jan 2, 1997
1956
9,840
12.73
Dec 23, 1955
1951
9,260
11.55
Nov 18, 1950
Location Photographs
ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ192)
Today: Showers, south winds around 25 mph in the morning. Snow showers in the morning, then snow showers and slight chance of thunderstorms in the afternoon. Near the crest, snow showers through the day. Slight chance of thunderstorms in the afternoon. Over higher elevations, southwest winds 25 to 35 mph. Windy. Snow accumulation up to 7 inches. Snow level 6000 feet. Highs 38 to 46 at 5000 feet and 29 to 38 at 8000 feet. Gusts up to 45 mph in the morning.

Tonight: Slight chance of thunderstorms in the evening, chance of showers. Near the crest, a 50 percent chance of thunderstorms in the evening. Mostly cloudy with a chance of snow showers. Snow level 5500 feet. Lows 32 to 37 at 5000 feet and 22 to 28 at 8000 feet.

Memorial Day: Mostly cloudy. Slight chance of showers in the morning. Near the crest, slight chance of snow showers in the morning. Chance of snow showers and slight chance of thunderstorms in the afternoon. Chance of precipitation 40 percent. Not as cool. Snow level 7500 feet. Highs 45 to 55 at 5000 feet and 36 to 46 at 8000 feet.

Monday Night: Mostly cloudy in the evening then becoming partly cloudy. Lows 37 to 43 at 5000 feet and 27 to 33 at 8000 feet.

Tuesday: Mostly cloudy. A 50 percent chance of showers in the afternoon. Not as cool. Snow level above 8000 feet. Highs 56 to 64 at 5000 feet and 45 to 55 at 8000 feet. North winds around 25 mph over higher elevations.

Tuesday Night: Partly cloudy in the evening then becoming mostly cloudy. Lows 41 to 47 at 5000 feet and 30 to 38 at 8000 feet.

Wednesday: Mostly cloudy. A 50 percent chance of showers in the afternoon. Highs 60 to 68 at 5000 feet and 48 to 58 at 8000 feet.

Wednesday Night: Mostly cloudy. Chance of snow showers and slight chance of showers in the evening. Chance of precipitation 40 percent. Lows 43 to 49 at 5000 feet and 31 to 39 at 8000 feet.

Thursday: Mostly cloudy with a chance of showers. Chance of snow showers in the afternoon. Chance of precipitation 50 percent. Highs 62 to 70 at 5000 feet and 49 to 59 at 8000 feet.

Thursday Night: Partly cloudy with a chance of snow showers and slight chance of showers in the evening, then mostly cloudy after midnight. Chance of precipitation 30 percent. Lows 44 to 50 at 5000 feet and 33 to 39 at 8000 feet.

Friday: Mostly cloudy with a 50 percent chance of showers. Highs 63 to 70 at 5000 feet and 50 to 60 at 8000 feet.

Friday Night: Mostly cloudy with a 40 percent chance of showers in the evening, then partly cloudy after midnight. Lows 46 to 52 at 5000 feet and 34 to 42 at 8000 feet.

Saturday: Mostly cloudy with a 50 percent chance of showers. Highs 64 to 72 at 5000 feet and 52 to 62 at 8000 feet.
Impacts - E19 Information
7.0 FeetCampgrounds at North Pines and Housekeeping Camp begin to flood.
9.5 FeetSubstantial road flooding occurs at Sentinel Crossover, Wosky Pond, and Chapel Meadow. Water is approximately one foot deep on the road through Chapel Meadow.
10.0 FeetNorthside and Southside Drive are impassable to vehicles. Water comes 1.5 feet up the side of the Yosemite Creek Lift Station and 1 to 2 inches above the foundation of pumps that control the Housekeeping Camp Lift Station. Water flows two feet over the "swinging bridge".
13.27 FeetFlood of record - January 2, 1997.
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 Joaquin Valley-Hanford 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.