| Lyman Glacier | |
| Type: | Mountain glacier |
| Location: | Mount Adams, Yakima County, Washington, USA |
| Map: | USA Washington#USA |
| Label Position: | right |
| Map Size: | 225 |
| Coordinates: | 46.2161°N -121.4842°W |
| Coordinates Ref: | [1] |
| Area: | 1.62sqkm in 2006 |
| Length: | 1.4miles |
| Terminus: | Talus |
| Status: | Retreating |
Lyman Glacier is located on the north slopes of Mount Adams a stratovolcano in Gifford Pinchot National Forest in the U.S. state of Washington.[2] The glacier is also within the Yakama Indian Reservation and descends from near the summit of Mount Adams at approximately 11400feet to a terminus near 7800feet. Below 9000feet the glacier splits into three distinct lobes.[2] Lyman Glacier has been in a general state of retreat for over 100 years and lost 34 percent of its surface area between 1904 and 2006.[3]
Lyman Glacier was named after William Denison Lyman by Claude Ewing Rusk because Lyman was one of the first to describe some of Mount Adams' features and history.[4]