Petersen Glacier, Glacier in Grand Teton National Park, Wyoming, US

Petersen Glacier lies in a cirque on the east flank of the ridge running from Table Mountain over The Wigwams to Littles Peak, immediately west of Cascade Canyon in Grand Teton National Park, at about 3,000 m. Its meltwater drains first into Mica Lake just below the glacier, then via Cascade Creek through Cascade Canyon to Jenny Lake and the Snake River.

The glacier takes its name from Frank Petersen, who made the first recorded ascent of Grand Teton mountain in 1898. This pioneering climb marked an important moment in the mountain's exploration history.

The name honours Frank Petersen, a member of the 1898 party that made one of the first recorded ascents of Grand Teton. The glacier sits in a cirque on the ridge running from Table Mountain past The Wigwams to Littles Peak, and its meltwater feeds Mica Lake before joining Cascade Creek.

The glacier sits in a cirque on the east flank of the ridge running from Table Mountain over The Wigwams to Littles Peak, just west of Cascade Canyon and above Mica Lake. There is no trail to it; approach from the Cascade Canyon trail and expect steep, unmarked terrain at about 3,000 m.

The glacier's runoff carries heavy rock flour, glacial silt that turns the water of Mica Lake, directly below the ice, turquoise. The lake drains via Cascade Creek through Cascade Canyon into Jenny Lake and eventually the Snake River. The glacier is no longer visible in satellite imagery, suggesting it may have disappeared.