| ||||||||||||||||||
| MIDDLE FORK COSUMNES RIVER - SOMERSET (SOSC1) | ||||||||||||||||||
| Latitude: 38.62º N | Longitude: 120.70º W | Elevation: 1821 Feet | ||||||||||||||||
| Location: El Dorado County in CA | ||||||||||||||||||
| River Group: San Joaquin | ||||||||||||||||||
| Issuance Time: | Jan 11 2026 at 8:39 AM PST |
| 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: Jan 11 2026 at 8:47 AM PST | ||||||
| Prob | Jan* | Feb | Mar | Apr | May | Jun |
| 10% | 31.7 | 51.5 | 55.0 | 41.5 | 32.8 | 11.5 |
| 25% | 26.6 | 31.9 | 39.3 | 27.6 | 23.4 | 7.3 |
| 50% | 23.8 | 17.7 | 28.7 | 19.1 | 10.9 | 4.7 |
| 75% | 22.0 | 9.1 | 17.9 | 13.0 | 6.4 | 3.7 |
| 90% | 21.7 | 6.2 | 8.5 | 8.5 | 4.8 | 3.2 |
| Mean | + | + | + | + | + | + |
| %Mean | + | + | + | + | + | + |
| Prob | Jul | Aug | Sep | Oct | Nov | Dec |
| 10% | 4.7 | 3.7 | 3.1 | 4.7 | 7.5 | 41.5 |
| 25% | 4.1 | 3.3 | 2.7 | 2.8 | 4.0 | 8.6 |
| 50% | 3.6 | 2.8 | 2.3 | 2.3 | 2.5 | 5.4 |
| 75% | 3.1 | 2.4 | 1.9 | 1.9 | 2.0 | 2.9 |
| 90% | 2.6 | 2.0 | 1.6 | 1.7 | 1.7 | 1.9 |
| Mean | + | + | + | + | + | + |
| %Mean | + | + | + | + | + | + |
| 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 (CAZ067) |
| Tonight: Mostly clear. Lows 36 to 44. Light winds. Monday: Patchy dense fog in the morning. Sunny. Highs 55 to 63. Light winds. Monday Night: Clear. Lows 38 to 46. Light winds. Tuesday: Sunny. Highs 56 to 68. Light winds. Tuesday Night: Clear. Lows 39 to 49. Light winds. Wednesday: Sunny. Highs 57 to 69. Wednesday Night: Clear. Lows 41 to 51. Thursday through Friday Night: Clear. Highs 60 to 70. Lows 41 to 51. Saturday through Sunday: Mostly clear. Highs 59 to 69. Lows 41 to 49. |