Branbury is located on the eastern shore of Lake Dunmore at the base of Mt. Moosalamoo. The Green Mountain National Forest is its neighbor to the east. Historically, the 69-acre park operated as a farm at the turn of the century, then a guest house, summer boy's camp and private beach and picnic area. In 1945, it became Branbury (Brandon-Salisbury) State Park.

The park is divided by Route 53. Twenty tent sites and 7 lean-to sites are on one side of the highway in a heavily wooded area, and 17 tent/RV sites are located along the perimeter of a grassy open area near the beach. Flush toilets, hot showers ($), and a dump station are provided. The 1000 foot natural sandy beach, clean, clear Lake Dunmore, and the large open grassy areas make the area very popular for swimming, sunning, or picnicking.