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
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.

Historical Stage/Flow Data
Water Year
Peak Discharge (cfs)
Stage (feet)
Date
 Most Recent 5 Years
2018
8,060
10.09
Apr 7, 2018
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
 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: Mostly cloudy. Highs 59 to 66 at 5000 feet and 45 to 51 at 8000 feet.

Tonight: Mostly cloudy. Lows 39 to 47 at 5000 feet and 28 to 36 at 8000 feet.

Saturday: Mostly cloudy. Near the crest, slight chance of snow showers in the afternoon. Over higher elevations, southwest winds 25 to 30 mph with gusts to around 45 mph. Windy. Little or no snow accumulation. Highs 51 to 59 at 5000 feet and 38 to 44 at 8000 feet. Southwest winds around 25 mph with gusts to around 40 mph in the afternoon.

Saturday Night: Mostly cloudy with a 50 percent chance of snow showers. Windy, colder. Lows 27 to 34 at 5000 feet and 16 to 24 at 8000 feet. Southwest winds 25 to 30 mph with gusts to around 45 mph over higher elevations.

Sunday: Snow showers likely and slight chance of thunderstorms. Colder. Chance of precipitation 70 percent. Snow accumulation up to 3 inches. Highs 34 to 42 at 5000 feet and 22 to 28 at 8000 feet. Over higher elevations, north winds around 25 mph in the afternoon. Wind chill readings around 2 below.

Sunday Night: Mostly cloudy with a slight chance of thunderstorms and snow showers in the evening, then partly cloudy after midnight. Windy, colder. Lows 23 to 31 at 5000 feet and 12 to 20 at 8000 feet.

Monday and Monday Night: Mostly clear. Windy. Highs 45 to 53 at 5000 feet and 32 to 38 at 8000 feet. Lows 29 to 37 at 5000 feet and 19 to 27 at 8000 feet.

Tuesday: Sunny. Not as cool. Highs 55 to 63 at 5000 feet and 44 to 50 at 8000 feet.

Tuesday Night: Mostly clear. Lows 33 to 41 at 5000 feet and 23 to 31 at 8000 feet.

Wednesday through Thursday: Partly cloudy. Highs 57 to 65 at 5000 feet and 45 to 51 at 8000 feet. Lows 35 to 43 at 5000 feet and 24 to 32 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.