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MERCED RIVER - HAPPY ISLES (HPIC1)
Latitude:
37.73º N		Longitude:
119.56º W		Elevation:
4017 Feet
Location: Mariposa County in CA
River Group: San Joaquin
Issuance Time: Jun 16 2025 at 6:23 AM PDT
Action/
Monitor:
N/A 		Minor
Flood:
7.5 Ft		Moderate
Flood:
10.0 Ft		Major
Flood:
13.27 Ft
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
Created with Highcharts 9.2.1Date/Time (Pacific)River Level (Feet)Flow (CFS)Probability of Threshold Exceedance​(%)Hourly River Level Threshold Exceedance Probabilities​MERCED RIVER - HAPPY ISLES (HPIC1)​Created: 06/16/2025 at 6:23 AM PDTJun 17​Tue​12amJun 18​Wed​12amJun 19​Thu​12amJun 20​Fri​12amJun 21​Sat​12amJun 16​Mon​12pmJun 17​Tue​12pmJun 18​Wed​12pmJun 19​Thu​12pmJun 20​Fri​12pm3456783647891,3982,1953,1954,40802550751007.5 ft Minor Flood Stage
Created with Highcharts 9.2.1Duration of Peak River​Level Threshold​Exceedance
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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.

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.