Peak Success. The southern summit of Mount Rainier. It was named in 1870 by Stevens and Van Trump on the occasion of their making the first ascent of the mountain. The new map calls it Point Success. Elevation, 14,150 feet above sea level.
Pearl Creek. On the southern slope of the mountain, draining Pyramid Glacier into Kautz Creek. About midway in its course the creek plunges over what are known as Pearl Falls.
Pigeon Creek. Near the north-central boundary of the Park.
Pinnacle Peak. One of the most dominant peaks of the Tatoosh Range in the south-central portion of the Park. Its height is marked at 6,562 feet. On its northern slope lies an ice field called Pinnacle Glacier. The ascent of this peak is attempted by many visitors starting from Paradise Valley.
Plummer Peak. Near the south-central boundary of the Park. The name was suggested by Superintendent Ethan Allen in honor of the late Fred G. Plummer, Geographer of the United States Forest Service.
Point Success. See Peak Success.
Prospector Creek. A tributary of Huckleberry Creek in the northeastern part of the Park.
Ptarmigan Ridge. On the northwestern slope of the mountain, lying north of the North Mowich Glacier and south of the Flett and Russell Glaciers. The name was given on account of the large number of ptarmigan families found there each summer. Named by Prof. J. B. Flett and H. H. Garretson.
Puyallup Cleaver. The large ridge of rocks on the western slope of the mountain, dividing the Puyallup and Tahoma Glaciers.
Puyallup Glacier. On the western slope. Its name comes from the fact that it feeds one of the branches of the Puyallup River.