It covers 2.0 square miles (5.2 km2) and contains 10.2 billion ft3 (289 million m3) of ice.

[1] Sharing the same source of ice as the northern South Mowich Glacier, the Puyallup Glacier begins as a branch off the ice stream that flow out of the Sunset Amphitheater.

Leaving the large expanse of ice, the glacier flows down a small valley, it narrows significantly as it turns northwestward.

From there on, the glacier is dirty and ends on steep, uneven terrain at about 6,000 ft (1,800 m).

[2] The glacier gives rise to the Puyallup River.