Sumner Falls is a 10-foot waterfall on Connecticut River in Sullivan County, New Hampshire, in the Northeastern Highlands region. It lies about 5.8 miles north of Windsor and roughly 60.9 miles northwest of Manchester as the crow flies.
At 10 feet it is on the modest side for New Hampshire, where the typical waterfall with a recorded height stands around 30 feet; it ranks 104th of 115. By form it is a segmented waterfall, splitting into two or more separate streams as it falls.
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. Connecticut River carries 5 recorded waterfalls, and Sumner Falls is the tallest of them.
Sullivan County holds 4 recorded waterfalls, and several are close by. North Hartland Falls, a 40-foot dam waterfall, is about 2.5 miles away across the state line in Vermont. Quechee Village Falls, a 15-foot cascade waterfall, is about 5.9 miles away across the state line in Vermont. Windsor Falls, a tiered waterfall, is about 6.2 miles away across the state line in Vermont.
Sumner Falls is located at 43.5646° N, 72.3803° 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 waterfall yet.