National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

*** IMPORTANT ***  Week of June 16 - Website Data Outage - Due to a major computer upgrade the week of June 16, nearly all data on the CNRFC web site will not be updated. We anticipate the down time to be approximately 4 days. The latest deterministic hydrologic forecasts for official forecast points will continue to be available at the National Water Prediction Service during this time.


MERCED RIVER - 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: Jun 16, 2025 at 6:23 AM PDT
Action/Monitor: N/A Minor Flood: 7.5 FeetModerate Flood: 10.0 FeetMajor Flood: 13.27 Feet
Please Note:Ensemble forecasts produced by CNRFC only consider meteorological uncertainty and do not account for hydrologic uncertainty.
Threshold Exceedance Plot                  Product Information        CSV Ensemble Files (Data in kcfs):  Forecast Group  |  HPIC1

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What information is considered in this forecast?
Verification / Historical Plots
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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: Sunny. Highs 74 to 86. Southwest winds up to 10 mph increasing to 10 to 15 mph in the afternoon.

Tonight: Clear. Lows 53 to 61. Northeast winds up to 10 mph.

Tuesday: Sunny. Highs 75 to 89. Southeast winds up to 5 mph shifting to the west 5 to 15 mph in the afternoon.

Tuesday Night: Clear. Lows 60 to 66. West winds 5 to 10 mph shifting to the east after midnight.

Wednesday: Warmer, sunny. Highs 81 to 93. East winds up to 5 mph shifting to the west in the afternoon.

Wednesday Night through Thursday Night: Clear. Lows 56 to 67. Highs 79 to 91.

Friday and Friday Night: Clear. Highs 72 to 86. Lows 50 to 56.

Saturday through Sunday: Clear. Highs 65 to 80. Lows 43 to 51.