Overview of Hubbard Glacier
Located in south-central Alaska north of Yakutat, with its origins in Yukon Territory, Canada, Hubbard Glacier is the largest tidewater glacier in North America. The highest source of snow accumulation is at approximately 11,000 feet, traveling 76-miles towards the 6-mile wide terminus at sea level in Disenchantment Bay and Russell Fiord. The terminus reaches as high as 100-meters above sea level, equivalent to the height of a 30-story building. Valerie Glacier joins Hubbard from the northwest approximately 6-miles from the terminus. Unlike the vast majority of glaciers, Hubbard Glacier has been both thickening and advancing since the International Boundary Commission first mapped it in 1895.
Twice in the recent past the terminus has dammed Russell Fiord by pinning proglacial sediment against Gilbert Point, first from June to October 1986, and more recently from June to August 2002. During both events, Russell Fjord’s water level rose significantly. This filling of Russell Fiord threatens to overtop the banks of the fjord, overflowing into the Situk River, flooding and eroding surrounding areas. A future damming event is likely given the glaciers continued advancing behavior.
We have monitoring sites located on Haenke Island and Gilbert Point. Gilbert Point has a climate station, a laser ranging system for measuring the terminus distance from Gilbert Point, a satellite-linked time-lapse camera, and a high-resolution DSLR time-lapse camera. Haenke Island has a fully equipped climate station. These data are updated regularly and can be viewed in near real-time on the Real-time Data and Real-time Images pages.