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
Action/Monitor: N/A Minor Flood: 7.5 FeetModerate Flood: 10.0 FeetMajor Flood: 13.27 Feet

Observed Data Credit
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Raw streamflow data is provided by the US Geological Survey (USGS).
View US Geological Survey (USGS) Data for this station location.

Historical Stage/Flow Data
Water Year
Peak Discharge (cfs)
Stage (feet)
Date
 Most Recent 5 Years
2024
2,980
6.80
May 19, 2024
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
 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
Flood Impacts
13.27 FeetFlood of Record: 1/2/97. $178 million in damage to Yosemite Valley.
10.0 FeetNorthside Drive at Wosky Pond, Southside Drive at Chapel Meadow, El Capitan crossover, and Sentinel crossover are impassable to vehicles.
8.2 FeetSwinging Bridge overtops. Water on road at Northside Drive, Southsie Drive, El Capitan crossover, and Sentinel crossover.
7.5 FeetFlood Stage. Housekeeping camp and Yosemite Valley backpacker campground begin to flood.
7.0 FeetNorth Pines and Lower Pines campgrounds begin flooding.
Official 7 Day National Weather Service Forecast   (CAZ324)
Today: Rain showers likely and slight chance of thunderstorms in the late morning and early afternoon. Rain likely and chance of thunderstorms late in the afternoon. Highs 44 to 54. Southwest winds up to 10 mph. Chance of precipitation 60 percent.

Tonight: Mostly cloudy with a 40 percent chance of thunderstorms in the evening, then clear after midnight. Lows 34 to 40. Northeast winds up to 10 mph.

Wednesday: Warmer, sunny. Highs 55 to 65. Northeast winds up to 5 mph shifting to the west in the afternoon.

Wednesday Night: Mostly cloudy in the evening then clearing. Lows 41 to 47. West winds up to 10 mph shifting to the east after midnight.

Thursday: Warmer, sunny. Highs 61 to 73. Southeast winds up to 5 mph shifting to the west in the afternoon.

Thursday Night through Friday Night: Mostly cloudy. Lows 45 to 52. Highs 61 to 73.

Saturday: Partly sunny. Highs 52 to 62.

Saturday Night: Mostly cloudy with a 30 percent chance of rain in the evening, then partly cloudy after midnight. Lows 39 to 45.

Sunday: Partly sunny. Highs 50 to 60.

Sunday Night: Mostly cloudy in the evening then clearing. Lows 40 to 46.

Monday: Warmer, sunny. Highs 61 to 71.
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.