The Mokelumne River in California is a popular destination for whitewater enthusiasts looking for a thrilling ride. The ideal streamflow range for the river is typically between 800-1,200 cfs, although it can vary depending on the time of year and weather conditions. The river is rated as a class III-IV, with some sections reaching class V during high water periods.

The river has several segments that are popular for whitewater rafting and kayaking, including the Electra-Middle Bar section which covers a distance of 9 miles and has a number of challenging rapids such as "Satan's Cesspool" and "Devil's Slide". Another popular segment is the Tiger Creek to Middle Bar section, which covers 7 miles and includes rapids such as "Chaos" and "Pinball".

While the Mokelumne River is a popular destination for whitewater enthusiasts, there are specific regulations that must be followed. For example, all boaters must wear a personal flotation device (PFD) while on the river, and all commercial outfitters must have a permit to operate. In addition, there are restrictions on the number of people allowed on a raft or kayak, and alcohol is not allowed on the river.

Overall, the Mokelumne River is a challenging and exciting destination for whitewater enthusiasts. However, it is important to be prepared and follow all regulations to ensure a safe and enjoyable experience.