Tunnel Run (Ralston Powerhouse To Greenwood)
Class IV- TO IV
STREAMFLOW: 2,570 CFS
Runnable88°, Slight Chance Showers Then Slight Chance T-Storms
The Tunnel Run section of the American River in California is a Class III-IV river run, with a total distance of 7.5 miles from Ralston Powerhouse to Greenwood. This section features a number of challenging rapids, including the infamous "Tunnel Chute" and "Chamberlin Falls." It is best to float this section in the spring months, when the snowmelt provides enough water flow to make the rapids more manageable. The recommended flow for this section is between 1,000 and 2,000 cfs. It is important for rafters and kayakers to be experienced and skilled in navigating Class III-IV rapids, as the Tunnel Run section can be dangerous for beginners.
Weather today, A slight chance of showers between 11am and 2pm, then a slight chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 88. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Chance of precipitation is 20%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
| Status | Runnable |
| Class Level | IV- to IV |
| Elevation | 717 ft |
| Run Length | 16.5 Mi |
| Gradient | 23 FPM |
| Streamflow Discharge | 2570 cfs |
| Gauge Height | 2.8 ft |
| Reporting Streamgage |
Nf American R A North Fork Dam Ca
USGS 11427000 |
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