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 18 2021 at 7:55 AM PDTNext Issuance: May 19 2021 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
2020
2,160
5.96
Apr 30, 2020
2019
4,240
7.79
Jun 13, 2019
2018
8,060
10.09
Apr 7, 2018
2017
5,210
8.45
Jun 20, 2017
2016
2,490
6.30
May 14, 2016
 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: Sunny. Highs 67 to 75 at 5000 feet and 56 to 66 at 8000 feet.

Tonight: Mostly clear. Lows 43 to 52 at 5000 feet and 34 to 42 at 8000 feet.

Wednesday: Sunny. Highs 62 to 70 at 5000 feet and 51 to 61 at 8000 feet. Over higher elevations, southwest winds around 25 mph in the afternoon, gusts up to 40 mph in the afternoon.

Wednesday Night: Mostly clear. Breezy, colder. Lows 35 to 44 at 5000 feet and 26 to 34 at 8000 feet. Over higher elevations, southwest winds 25 to 30 mph in the evening. Gusts up to 50 mph over higher elevations.

Thursday: Mostly cloudy. Slight chance of snow showers in the afternoon. Little or no snow accumulation. Highs 50 to 58 at 5000 feet and 37 to 47 at 8000 feet. Gusts up to 40 mph in the afternoon.

Thursday Night: Mostly cloudy with a chance of snow showers in the evening, then partly cloudy with a slight chance of snow showers after midnight. Colder. Chance of snow 40 percent. Lows 31 to 39 at 5000 feet and 22 to 28 at 8000 feet.

Friday: Mostly cloudy with a chance of snow showers. Chance of showers and slight chance of thunderstorms in the afternoon. Chance of precipitation 50 percent. Highs 48 to 54 at 5000 feet and 33 to 43 at 8000 feet.

Friday Night: Mostly cloudy with a slight chance of snow showers in the evening, then partly cloudy after midnight. Lows 33 to 41 at 5000 feet and 22 to 30 at 8000 feet.

Saturday: Mostly cloudy. Chance of showers, snow showers and slight chance of thunderstorms in the afternoon. Not as cool. Chance of precipitation 50 percent. Highs 52 to 60 at 5000 feet and 39 to 49 at 8000 feet.

Saturday Night: Mostly cloudy with a slight chance of snow showers in the evening, then mostly clear after midnight. Lows 35 to 45 at 5000 feet and 25 to 33 at 8000 feet.

Sunday and Sunday Night: Mostly clear. Highs 62 to 68 at 5000 feet and 48 to 58 at 8000 feet. Lows 41 to 51 at 5000 feet and 31 to 39 at 8000 feet.

Monday: Sunny. Not as cool. Highs 69 to 75 at 5000 feet and 55 to 65 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.