The North Popo Agie River, located in Wyoming, is a popular destination for whitewater rafting enthusiasts. The ideal streamflow range for this river is between 200 and 800 cubic feet per second (cfs) depending on the section being run. The river is rated as a class III-IV, which means it is suitable for experienced paddlers with good control and solid river skills. The segment mileage varies depending on the section being run, with the Upper North Popo Agie River having a segment of 5 miles, and the Lower North Popo Agie River having a segment of 9 miles.

The North Popo Agie River has several rapids and obstacles that make it an exciting and challenging ride. Some of the notable rapids include The S-Turn, The Room of Doom, and The Boulder Garden. These rapids provide thrilling drops and technical maneuvers that require paddlers to be skilled and focused.

In terms of regulations, the North Popo Agie River is regulated by the Bureau of Land Management (BLM). The BLM requires all boaters to have a permit for overnight trips, and also mandates the use of a portable toilet to protect the river's water quality. Additionally, all boaters are required to adhere to Leave No Trace principles, which include packing out all trash and minimizing impact on the surrounding environment.

In conclusion, the North Popo Agie River offers a challenging and exhilarating whitewater rafting experience for experienced paddlers. With its ideal streamflow range, class rating, segment mileage, specific river rapids/obstacles, and specific regulations to the area, this river is a must-visit destination for anyone seeking a thrilling whitewater adventure in Wyoming.