| Pemigewasset River | |
| Pushpin Map: | New Hampshire#USA |
| Pushpin Map Size: | 250 px |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | New Hampshire |
| Subdivision Type3: | Counties |
| Subdivision Name3: | Grafton, Belknap, Merrimack |
| Subdivision Type4: | Towns and city |
| Subdivision Name4: | Franconia, Lincoln, Woodstock, Thornton, Campton, Plymouth, Holderness, Ashland, Bridgewater, New Hampton, Bristol, Hill, Sanbornton, Franklin |
| Length: | 65miles |
| Source1: | Franconia Notch |
| Source1 Location: | Franconia |
| Source1 Coordinates: | 44.1717°N -71.6872°W |
| Source1 Elevation: | 1980feet |
| Mouth: | Merrimack River |
| Mouth Location: | Franklin |
| Mouth Coordinates: | 43.4364°N -71.6483°W |
| Mouth Elevation: | 262feet |
| Tributaries Left: | Flume Brook, East Branch Pemigewasset River, Mad River, Beebe River, Squam River, Salmon Brook, Winnipesaukee River |
| Tributaries Right: | Moosilauke Brook, Hubbard Brook, West Branch Brook, Baker River, Newfound River, Smith River, Chance Pond Brook |
The Pemigewasset River, known locally as "The Pemi", is a river in the state of New Hampshire, the United States. It is 65miles in length and (with its tributaries) drains approximately 1021sqmi.[1] The name "Pemigewasset" comes from the Abenaki word bemijijoasek [bəmidzidzoasək], meaning "where side (entering) current is".[2]
The Pemigewasset originates at Profile Lake in Franconia Notch State Park, in the town of Franconia. It flows south through the White Mountains and merges with the Winnipesaukee River to form the Merrimack River at Franklin. The Merrimack then flows through southern New Hampshire, northeastern Massachusetts and into the Atlantic Ocean.
The Interstate 93 highway runs parallel with the river between Franconia Notch and New Hampton. The river passes through the communities of Lincoln, North Woodstock, Woodstock, Thornton, Campton, Plymouth, Holderness, Ashland, Bridgewater, Bristol, New Hampton, Hill, Sanbornton, and Franklin.
The river descends over waterfalls in Franconia Notch, including "The Basin", passes cascades in North Woodstock, and drops over Livermore Falls north of Plymouth. The remainder of the northern Pemi, from Lincoln to Ashland, passes over copious gravel bars and attracts numerous boaters and fishermen. Below Ashland, the river is impounded by the Ayers Island Dam, a hydroelectric facility, for over five miles. A short stretch of heavy whitewater is found below the dam, before the river reaches the impoundment zone for the Franklin Falls flood control reservoir. The river crosses one additional hydroelectric dam below Franklin Falls before joining the Winnipesaukee River in the center of Franklin, becoming the Merrimack River.
The Pemigewasset watershed consists of over of rivers and 17000acres of lake, pond, and reservoir area. The watershed comprises about 20 percent of the Merrimack's total watershed area.
Major tributaries include (from north to south):