Pocumtuck (Pocumtuc) was the name of a now extinct tribe of Native Americans who lived in the area prior to 1800.
According to stories ascribed to the tribe, Pocumtuck Ridge and Sugarloaf Mountain were the remains of a giant beaver killed by the giant spirit Hobomock (the same spirit who diverted the course of the Connecticut River in central Connecticut and was cursed to sleep forever as the Sleeping Giant mountain formation).
The Pocumtucks allegedly believed that the beaver lived in an enormous lake that once occupied the Connecticut River Valley:
The Great Beaver, whose pond flowed over the whole basin of Mt. Tom, made havoc among the fish and when these failed he would come ashore and devour Indians.
A pow-wow was held and Hobomock raised, who came to their relief.
With a great stake in hand, he waded the river until he found the beaver, and so hotly chased him that he sought to escape by digging into the ground.
Hobomock saw his plan and his whereabouts, and with his great stake jammed the beaver's head off.
The earth over the beaver's head we call Sugarloaf, his body [Pocumtuck Ridge] lies just to the north of it.

A number of different versions of this story exist, all of them similar.
There may be some scientific truth to the account.
The lake described in the tale is very reminiscent of the post-glacial Lake Hitchcock which occupied the Connecticut River Valley from Burke, Vermont to New Britain, Connecticut 15,000 years ago.
Around this time, a giant beaver species (Castoroides ohioensis) thrived from the post-glacial front to as far south as Florida.
The animals were as large as black bears, weighed up to 450 lbs.,
and had teeth the size of bananas.
A similar legend about the killing of a giant beaver by a helper-spirit and the subsequent transformation of the corpse into a landform occurs among the native Mi'kmaq people of Nova Scotia (see Glooscap).
Pocumtuck (Pocumtuc) was the name of a now extinct tribe of Native Americans who lived in the area prior to 1800. According to stories ascribed to the tribe, Pocumtuck Ridge and Sugarloaf Mountain were the remains of a giant beaver killed by the giant spirit Hobomock (the same spirit who diverted the course of the Connecticut River in central Connecticut and was cursed to sleep forever as the Sleeping Giant mountain formation). The Pocumtucks allegedly believed that the beaver lived in an enormous lake that once occupied the Connecticut River Valley:
The Great Beaver, whose pond flowed over the whole basin of Mt. Tom, made havoc among the fish and when these failed he would come ashore and devour Indians. A pow-wow was held and Hobomock raised, who came to their relief. With a great stake in hand, he waded the river until he found the beaver, and so hotly chased him that he sought to escape by digging into the ground. Hobomock saw his plan and his whereabouts, and with his great stake jammed the beaver's head off. The earth over the beaver's head we call Sugarloaf, his body [Pocumtuck Ridge] lies just to the north of it.
A number of different versions of this story exist, all of them similar. There may be some scientific truth to the account. The lake described in the tale is very reminiscent of the post-glacial Lake Hitchcock which occupied the Connecticut River Valley from Burke, Vermont to New Britain, Connecticut 15,000 years ago. Around this time, a giant beaver species (Castoroides ohioensis) thrived from the post-glacial front to as far south as Florida. The animals were as large as black bears, weighed up to 450 lbs., and had teeth the size of bananas. A similar legend about the killing of a giant beaver by a helper-spirit and the subsequent transformation of the corpse into a landform occurs among the native Mi'kmaq people of Nova Scotia (see Glooscap).
Pocumtuck Range