Lake Dunmore is a freshwater lake in Addison County, Vermont. The lake spans the towns of Salisbury and Leicester and has a surface area of 985 acres. Lake Dunmore is over 3 miles long and up to 1 mile wide. The primary source of water is Sucker Brook, which rises in the adjacent Moosalamoo National Recreation Area of the Green Mountain Nation…Lake Dunmore is a freshwater lake in Addison County, Vermont. The lake spans the towns of Salisbury and Leicester and has a surface area of 985 acres. Lake Dunmore is over 3 miles long and up to 1 mile wide. The primary source of water is Sucker Brook, which rises in the adjacent Moosalamoo National Recreation Area of the Green Mountain National Forest. The lake is drained by Leicester River, a tributary to Otter Creek, which in turn empties into Lake Champlain.