The Blakley Creek to Miller Creek run is a popular whitewater destination in Montana, offering a challenging and scenic adventure for experienced paddlers. The ideal streamflow range for this section is between 500 and 2,000 cfs, depending on the season and recent precipitation. At lower flows, the rapids become more technical, while at higher flows, they become bigger and faster.

This section of the river is rated as class III-IV, with some difficult rapids and obstacles to navigate. One of the most challenging rapids is called "The Notch," which requires precise maneuvering to avoid a dangerous undercut rock. Other notable obstacles include "Ledge Hole" and "Pinball."

The segment mileage for this run is approximately 12 miles. It begins in Section 26, T4S, R12E, and ends in Section 13, T4S, R21E. The scenery along the way is breathtaking, with towering cliffs, dense forests, and occasional wildlife sightings.

There are specific regulations to be aware of when paddling this section of the river. Boats must have a current Montana Invasive Species Prevention Pass, and all gear must be thoroughly cleaned and dried before entering the water to prevent the spread of invasive species. Additionally, there are restrictions on camping and fires in some areas, so it is important to check with local authorities before setting up camp.

Overall, the Blakley Creek to Miller Creek run is a challenging and rewarding whitewater experience in Montana. Paddlers should be experienced and well-prepared for the rapids and obstacles they will encounter, and should always follow local regulations to protect the environment and ensure the safety of all involved.