What is the name of the thickest temperate glacier in the world?

The thickest known temperate alpine glacier in the world is Taku Glacier in Alaska. Located southeast of Juneau, it reaches a measured ice thickness of about 4,845 feet, or roughly 1,477 metres.

Taku is a tidewater glacier that originates in the Juneau Icefield and flows toward Taku Inlet. It is also the largest glacier in the Juneau Icefield. The glacier’s name comes from the local Tlingit people; earlier explorers referred to it as Schultze Glacier and Foster Glacier before the name Taku became established.

Unlike many glaciers in Alaska and around the world, Taku advanced for much of the late nineteenth and twentieth centuries. Its positive mass balance meant that snowfall and ice accumulation exceeded melting. The glacier has periodically advanced far enough to block the Taku River, creating a lake behind an ice dam that could later break dramatically.

Taku is often confused with Vatnajökull, Perito Moreno or Hubbard Glacier because those are also famous and substantial glaciers. However, the question concerns maximum thickness in a temperate alpine glacier, not total area, length, fame or whether a glacier reaches the sea.