2025-12-29T09:00:00-08:00
* WHAT...Temperatures as low as 33 to 36 degrees will result in frost formation. * WHERE...Elevations below 2,000 feet in the Motherlode, Carquinez Strait and Delta, Central and Southern Sacramento Valley, and Northern San Joaquin Valley. * WHEN...From 1 AM to 9 AM PST Monday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. * ADDITIONAL DETAILS...Frost formation may be inhibited by northerly flow along and west of Interstate 5, or in areas where fog forms early on in the night.
Summary
The river features several obstacles, including boulders and rapids, making it best suited for intermediate and advanced paddlers. The best time of year to float this section of water is in the spring, when the water levels are high, with a recommended flow of 500-1000 cfs. Paddlers should use caution when navigating the river, as there are several sections with strong currents and potential hazards. Overall, the Yankee Jim Road to Ponderosa Way Shirttail River Run offers an exciting and challenging adventure for experienced paddlers.
River Run Details
| Last Updated | 2023-06-13 |
| River Levels | 1390 cfs (1.86 ft) |
| Percent of Normal | 200% |
| Optimal Range | 500-5000 cfs |
| Status | Runnable |
| Class Level | II to III |
| Elevation | 717 ft |
| Run Length | 5.0 Mi |
| Gradient | 21 FPM |
| Streamflow Discharge | 2160 cfs |
| Gauge Height | 2.5 ft |
| Reporting Streamgage | USGS 11427000 |
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