Mill Creek is a popular whitewater river run located in California, with an ideal streamflow range of 100-300 cfs. The river run is classified as Class IV-V and covers approximately 11 miles in distance. One of the most notable rapids on the river is the "Toilet Bowl," which is a technical rapid that requires precise maneuvering to avoid rocks and holes.

In addition to the Toilet Bowl, other notable rapids and obstacles on the Mill Creek include the "Sluice Box" and "Three Falls." The Sluice Box is a tight, narrow channel that requires quick thinking and precise paddling to avoid getting pinned against the rocks. Three Falls is a series of waterfalls that are challenging to navigate and require a high level of skill and experience.

As with any whitewater river run, there are specific regulations and rules that must be followed when navigating Mill Creek. One of the most important regulations is the requirement for all participants to wear personal flotation devices (PFDs) at all times while on the river. Additionally, there are restrictions on the use of motorized boats and other equipment that may disturb the natural environment of the river.

In conclusion, Mill Creek is a challenging and exciting whitewater river run that requires a high level of skill and experience to navigate safely. With its Class IV-V rapids and numerous obstacles, it is a popular destination for experienced whitewater enthusiasts. However, it is important to follow all rules and regulations when participating in this activity to ensure the safety of all participants and the preservation of the natural environment.