The Paria River in Arizona is a popular whitewater river run with an ideal streamflow range of 150-600 cfs. It is rated as a class II-III, with some sections reaching class IV during high water. The river has a segment mileage of approximately 38 miles from the launch point at White House Campground to Lee's Ferry.

The Paria River features several notable rapids and obstacles, including the House Rock Rapid, located about 9 miles downstream from the launch point, which is a class III-IV rapid with a large boulder in the middle of the channel that creates a challenging obstacle for boaters. Another significant rapid is the Paria Riffle, located about 23 miles downstream, which is a class III rapid that requires precise maneuvering to avoid rocks and shallow areas.

There are specific regulations to the area that must be followed in order to protect the river and surrounding environment. These regulations include obtaining a permit to float the river, following Leave No Trace principles, and adhering to strict camping guidelines to prevent damage to the fragile desert ecosystem.

In conclusion, the Paria River in Arizona offers a thrilling and challenging whitewater experience with a range of rapids and obstacles to navigate. With a specific set of regulations in place, it is important for boaters to follow guidelines to ensure the preservation of this unique and beautiful river system.