Simms Stream is a 10.4-mile (16.7 km) long  river in northern New Hampshire in the United States. It is a tributary of the Connecticut River, which flows south to Long Island Sound, an arm of the Atlantic Ocean.
Simms Stream is located entirely in the town of Columbia, New Hampshire. It rises near Gadwah Notch in the eastern part of Columbia and flows northwest through logging and farming country to the Connecticut River near the border between Columbia and Colebrook.
- New Hampshire GRANIT state geographic information system Archived 2013-08-03 at the Wayback Machine.
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