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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: | May 09 2025 at 9:11 AM PDT |
| Please Note: | Ensemble forecasts produced by CNRFC only consider meteorological uncertainty and do not account for hydrologic uncertainty. Flow data on this product are unregulated / full natural flow. |
| Monthly Probability Plot |
| Monthly Streamflow Volume (1000s of Acre-Feet) Data Updated: May 09 2025 at 9:14 AM PDT | ||||||
| Prob | May* | Jun | Jul | Aug | Sep | Oct |
| 10% | 91.8 | 52.8 | 22.1 | 5.5 | 2.5 | 6.3 |
| 25% | 88.0 | 47.6 | 18.1 | 4.7 | 2.2 | 2.4 |
| 50% | 83.1 | 42.4 | 15.1 | 4.1 | 1.9 | 1.6 |
| 75% | 79.5 | 38.8 | 13.3 | 3.8 | 1.8 | 1.2 |
| 90% | 77.7 | 36.5 | 11.9 | 3.7 | 1.7 | 1.1 |
| Mean | 79.5 | 69.5 | 31.6 | 7.5 | 2.7 | 2.9 |
| %Mean | 104.5 | 61.0 | 47.8 | 54.7 | 70.4 | 55.2 |
| Prob | Nov | Dec | Jan | Feb | Mar | Apr |
| 10% | 8.9 | 10.9 | 13.0 | 16.7 | 34.4 | 55.6 |
| 25% | 4.5 | 4.3 | 6.4 | 10.7 | 21.4 | 49.9 |
| 50% | 2.4 | 2.6 | 4.0 | 5.5 | 17.1 | 39.8 |
| 75% | 1.6 | 1.6 | 1.6 | 3.9 | 13.0 | 30.3 |
| 90% | 1.2 | 1.3 | 1.4 | 2.3 | 8.5 | 25.3 |
| Mean | 3.9 | 4.9 | 7.7 | 8.1 | 15.8 | 39.6 |
| %Mean | 61.5 | 53.1 | 51.9 | 67.9 | 108.2 | 100.5 |
| Note 1: %Mean is the "Median forecast monthly value (50%)" divided by the "monthly mean" (displayed as a %) | ||||||
| Note 2: For current month, graphic represents remaining forecast only, text represents observed + remaining forecast. | ||||||
| Location Photographs | ||
| ESRI™ Locator Map |
| Official 7 Day National Weather Service Forecast (CAZ324) |
| Today: Warmer, sunny. Highs 72 to 84. South winds up to 5 mph shifting to the southwest in the afternoon. Tonight: Mostly clear. Lows 54 to 62. Northeast winds up to 5 mph. Saturday: Sunny. Highs 74 to 84. Southeast winds up to 10 mph shifting to the southwest in the afternoon. Saturday Night: Mostly clear. Lows 52 to 58. Southwest winds 5 to 10 mph with gusts to around 25 mph shifting to the southeast after midnight. Sunday: Sunny. Highs 64 to 74. South winds up to 10 mph increasing to southwest 10 to 20 mph with gusts to around 35 mph in the afternoon. Sunday Night and Monday: Cooler. Mostly clear. Lows in the upper 40s. Highs 53 to 65. Monday Night: Colder. Mostly cloudy. Chance of rain in the evening, then chance of rain and snow after midnight. Lows 35 to 41. Chance of precipitation 50 percent. Tuesday: Mostly sunny. Chance of rain showers in the afternoon. Highs 45 to 55. Chance of showers 40 percent. Tuesday Night: Mostly cloudy in the evening then clearing. Lows 34 to 40. Wednesday: Not as cool. Sunny. Highs 54 to 64. Wednesday Night: Partly cloudy. Lows 40 to 46. Thursday: Warmer, sunny. Highs 60 to 70. |
| Flood Impacts | |
| 13.27 Feet | Flood of Record: 1/2/97. $178 million in damage to Yosemite Valley. |
| 10.0 Feet | Northside Drive at Wosky Pond, Southside Drive at Chapel Meadow, El Capitan crossover, and Sentinel crossover are impassable to vehicles. |
| 8.2 Feet | Swinging Bridge overtops. Water on road at Northside Drive, Southsie Drive, El Capitan crossover, and Sentinel crossover. |
| 7.5 Feet | Flood Stage. Housekeeping camp and Yosemite Valley backpacker campground begin to flood. |
| 7.0 Feet | North Pines and Lower Pines campgrounds begin flooding. |