TUNNEL RUN (RALSTON POWERHOUSE TO GREENWOOD)
River Runs • Kayaking • Whitewater
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.
Realtime River Levels
Nf American R A North Fork Dam Ca
USGS 11427000
October 13, 2024
°F
°F
mph
Windspeed
%
Humidity
| Last Updated | 2023-06-13 |
| River Levels | 1390 cfs (1.86 ft) |
| Percent of Normal | 200% |
| Optimal Range | 700-3000 cfs |
| Status | Too Low |
| Class Level | IV- to IV |
| Elevation | 717 ft |
| Run Length | 16.5 Mi |
| Gradient | 23 FPM |
| Streamflow Discharge | 41.8 cfs |
| Gauge Height | 0.3 ft |
| Reporting Streamgage |
Nf American R A North Fork Dam Ca
USGS 11427000 |
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