The Gridley River is a 6.3-mile-long (10.1 km)^[1] river in southern New Hampshire in the United States. It is a tributary of the Contoocook River, part of the Merrimack River watershed. Most of the river's length is within the town of Sharon.

Quick Facts Location, Country ...

Gridley River
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Location
Country	United States
State	New Hampshire
County	Hillsborough
Towns	New Ipswich, Sharon, Peterborough
Physical characteristics
Source	Wapack Range
• location	New Ipswich
• coordinates	42°46′45″N 71°53′28″W
• elevation	1,480 ft (450 m)
Mouth	Contoocook River
• location	Peterborough
• coordinates	42°50′8″N 71°58′36″W
• elevation	818 ft (249 m)
Length	6.3 mi (10.1 km)

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The Gridley River begins in the northwestern corner of New Ipswich, New Hampshire, on the western slopes of Kidder Mountain in the Wapack Range. The small stream flows west into Tophet Swamp, where it picks up a tributary from the northeast. The river soon enters the town of Sharon and heads north through wetlands and intervening steep patches, reaching the Contoocook River just within the southwestern corner of Peterborough.^[2]

• List of rivers of New Hampshire