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: 7.5 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
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
2018
8,060
10.09
Apr 7, 2018
 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
Official 7 Day National Weather Service Forecast   (CAZ324)
Tonight: Mostly cloudy until early morning then clearing. Lows 39 to 47. Northeast winds up to 5 mph.

Monday: Mostly sunny. Highs 53 to 61. East winds up to 5 mph shifting to the west in the afternoon.

Monday Night: Mostly clear. Lows 34 to 42. Northeast winds up to 5 mph.

Tuesday: Sunny. Highs 50 to 58. Northeast winds up to 5 mph shifting to the north around 5 mph in the afternoon.

Tuesday Night: Mostly clear. Lows 33 to 41. East winds 5 to 10 mph.

Wednesday: Sunny. Highs 52 to 60.

Wednesday Night: Partly cloudy. Lows 36 to 44.

Thursday through Friday Night: Mostly cloudy. Highs 51 to 63. Lows 38 to 47.

Saturday and Saturday Night: Partly cloudy. Highs 56 to 64. Lows 38 to 46.

Sunday: Mostly sunny. Chance of rain in the afternoon. Highs 54 to 64. Chance of rain 30 percent.
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.
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.