The Whitewater River Run on the Atwell Mill Trail Bridge in California is a popular destination for whitewater enthusiasts. The ideal streamflow range for this river run ranges from 500 to 800 cubic feet per second (cfs) and is classed as a Class III to IV rapid, making it suitable for intermediate to advanced level paddlers.

The segment mileage of the Whitewater River Run is about 7 miles, starting at the Atwell Mill Trail Bridge and extending up to the boundary of Sequoia & Kings Canyon National Park. Some of the specific river rapids and obstacles include the S-turn rapid, the Roller Coaster rapid, and the Corner Pocket rapid, which provide exciting and challenging experiences for paddlers.

To ensure safety and protect the environment, there are specific regulations that apply to the area. Paddlers are required to wear life jackets and helmets, and groups are limited to no more than six people per permit. Camping and campfires are not allowed along the riverbank, and visitors are expected to follow Leave No Trace principles.

Overall, the Whitewater River Run on the Atwell Mill Trail Bridge is a thrilling and challenging experience for whitewater enthusiasts. It offers exciting rapids and obstacles, and visitors are expected to follow regulations to ensure safety and protect the environment.