Hellgate Falls is a stretch of rapids on Dead Diamond River in Coos County, New Hampshire, in the Northeastern Highlands region. It lies about 19.3 miles east of Colebrook and roughly 100.4 miles northwest of Portland as the crow flies.
The Northeastern Highlands are the mountains of northern New England and the Adirondacks, with spruce-fir on the summits and northern hardwood forest of maple, beech and birch below, and countless lakes and boulder-strewn brooks. Fast mountain streams drop over granite and gneiss ledges in chains of falls and pools. Dead Diamond River carries 2 recorded rapids along its course.
There are 4 recorded rapids in Coos County. MacKeanon Falls, is about 1.7 miles away. Ellingwood Falls, is about 7.1 miles away. Beecher Falls, is about 19.2 miles away across the state line in Vermont.
Hellgate Falls is located at 44.9746° N, 71.1188° W. The listing is based on the World Waterfall Database, one of the sources compiled by the U.S. Geological Survey in its inventory of waterfalls and rapids of the conterminous United States. The creek name is confirmed against the federal Geographic Names Information System. The position was verified on aerial imagery. Details on trails, parking and access have not been documented for this rapid yet.