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 CaliforniaBulletin Group: San JoaquinRiver Group: San Joaquin
Issuance Time: May 24 2024 at 8:13 AM PDTNext Issuance: May 25 2024 at 9:00 AM PDT
Monitor Stage: N/A Flood Stage: 7.5 Feet

Please Note: Each individual timeseries plotted on the graphical river forecast can be toggled on and off by clicking the legend entry above. If the "Observed (Raw Data)" contains bad data and is toggled off, the plot will scale to the remaining timeseries.
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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Year:  
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To view other verification locations, use our Historical Graphical River Forecast Interface.
Historical Stage/Flow Data
Water Year
Peak Discharge (cfs)
Stage (feet)
Date
 Most Recent 5 Years
2023
4,980
8.42
May 23, 2023
2022
2,430
6.25
Oct 25, 2021
2021
1,410
5.02
May 7, 2021
2020
2,160
5.96
Apr 30, 2020
2019
4,240
7.79
Jun 13, 2019
 Historical High Stage/Flow Events (Period of Record - Aug 1915 to Present) - Ranked by Flow
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
Impacts - E19 Information
7.0 FeetCampgrounds at North Pines and Lower Pines begin to flood.
7.5 FeetHousekeeping Camp and Yosemite Valley Backpacker Campground begin to flood.
10.0 FeetNorthside Drive at Wosky Pond, Southside Drive at Chapel Meadow, El Capitan Crossover, and Sentinel Crossover are impassible to vehicles.
13.27 FeetFlood of record - January 2, 1997. $178M in damage to Yosemite Valley.
Official 7 Day National Weather Service Forecast   (CAZ324)
Today: Mostly sunny. Highs 59 to 71. Southwest winds up to 10 mph increasing to 10 to 15 mph in the afternoon.

Tonight: Mostly clear. Lows 42 to 48. Southwest winds up to 10 mph shifting to the east after midnight.

Saturday: Sunny. Highs 59 to 71. Southwest winds up to 5 mph increasing to 5 to 15 mph in the afternoon.

Saturday Night: Mostly clear. Lows 45 to 51. West winds up to 10 mph shifting to the east after midnight.

Sunday: Warmer, sunny. Highs 66 to 78. Southeast winds up to 5 mph shifting to the west in the afternoon.

Sunday Night: Mostly clear. Lows 50 to 56.

Memorial Day: Sunny. Highs 69 to 81.

Monday Night: Mostly clear. Lows 51 to 57.

Tuesday: Sunny. Highs 71 to 81.

Tuesday Night through Wednesday Night: Mostly clear. Lows 51 to 58. Highs 70 to 82.

Thursday: Sunny. Highs 72 to 84.
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.