The Whitewater River Run in Montana is a popular destination for whitewater enthusiasts. The Cedar Log Creek Headwaters to Mainstem section is approximately 14 miles long and is rated as a Class III-IV run. This section of the river features numerous rapids and obstacles, including "Sleeping Giant," "S-Turn," and "Triple Drop."

The ideal streamflow range for this section of the river is between 1,500 and 3,000 cubic feet per second (cfs). However, it is important to note that the river can be dangerous at high flows and should only be attempted by experienced paddlers.

In terms of regulations, all boaters are required to have a Montana fishing license, and it is recommended to carry a first-aid kit and personal flotation device. It is also important to be aware of private property along the river and to respect the owners' rights.

Overall, the Whitewater River Run in Montana offers a thrilling and challenging whitewater experience for experienced paddlers. It is important to check current water levels and to be aware of any potential hazards before attempting this run.