Caledonia-1 Vermont Representative District, 2002–2012

The Passumpsic River () is a 22.7-mile-long (36.5 km) tributary of the Connecticut River, in Vermont. Though primarily a Caledonia County river, it is the only river to flow through all three counties of the Northeast Kingdom.

Barnet is the primary village and a census-designated place (CDP) in the town of Barnet, Caledonia County, Vermont, United States. As of the 2020 census, the CDP had a population of 127, out of 1,663 in the entire town of Barnet. The village is in southeastern Caledonia County, along the southeast edge of the town of Barnet, sitting on the west bank of the Connecticut River. It is bordered to the southeast, across the river, by the town of Monroe, New Hampshire. Interstate 91 forms the northwest edge of the CDP, with access from Exit 18 (West Barnet Road). I-91 leads north 10 miles (16 km) to St. Johnsbury and south 50 miles (80 km) to White River Junction. U.S. Route 5 passes through the center of the village, paralleling I-91; it leads north 9 miles (14 km) to St. Johnsbury and south 11 miles (18 km) to Wells River.

Barnet is a town in Caledonia County, Vermont, United States. The population was 1,663 at the 2020 census. Barnet contains the locations of Barnet Center, East Barnet, McIndoe Falls, Mosquitoville, Passumpsic and West Barnet. The main settlement of Barnet is recorded as a census-designated place by the U.S. Census Bureau, with a population of 127 at the 2020 census.

The Barnet Center Historic District encompasses a small cluster of buildings and a cemetery, which make up the original town center of Barnet, Vermont. Located on Barnet Center Road, it includes the 1849 Presbyterian church, vestry, and two residences, built between 1790 and 1898, as well as the town's first cemetery and a c. 1915 toolshed. It was the first town in Vermont to be settled by direct immigration from Scotland. The district was listed on the National Register of Historic Places in 1984.

The Thresher Mill is a historic industrial facility on West Barnet Road in Barnet, Vermont. First developed in 1836, it was the last water-powered mill to operate on the Stevens River, lasting into the late 20th century. The property, which includes an original mill dam and a surviving 1872 mill building, as well as archaeological sites of other industrial buildings, was listed on the National Register of Historic Places in 1996. It is now styled Ben's Mill, and is a local museum.

Comerford Reservoir is a 1,029-acre (4 km2) impoundment located on the Connecticut River on the boundary between Vermont and New Hampshire in the United States. The reservoir is formed by the Frank D. Comerford Dam in the towns of Monroe, New Hampshire, and Barnet, Vermont, and impounds water into the towns of Littleton, New Hampshire, and Waterford, Vermont, nearly to the Moore Reservoir upstream on the Connecticut.

Frank D. Comerford Dam is an International Style concrete dam in the Fifteen Mile Falls of the Connecticut River, on the border between the U.S. states of New Hampshire and Vermont. The dam is near Monroe, New Hampshire and Barnet, Vermont. Construction began in 1928 and was completed in 1931. The dam and the power plant were acquired by a subsidiary of Hydro-Québec from Great River Hydro, LLC, in October 2022.Comerford Reservoir is the reservoir created behind the dam, named after Frank D. Comerford, president of the Connecticut River Power Company and the New England Power Company. Hydroelectric power plants have the ability to vary the amount of power generated, depending on the demand. Steam turbine power plants are not as easily "throttled" because of the amount of thermodynamic inertia contained in their systems.

McIndoes Academy is a historic school building on Main Street (United States Route 5) in the McIndoe Falls village of Barnet, Vermont. Built in 1853, it is a prominent local example of Greek Revival architecture, serving as a local high school until 1969. It was listed on the National Register of Historic Places in 1975.

The Phineas Thurston House is a historic house on Old Silo Road (Town Highway 12) in Barnet, Vermont. Built about 1787, it is one of the oldest surviving houses in northeastern Vermont, and one of the best-preserved early houses in Barnet. It was listed on the National Register of Historic Places in 1989.

Monroe is a town in Grafton County, New Hampshire, United States. The population was 864 at the 2020 census, up from 788 at the 2010 census. The town is located along the Connecticut River, across from Barnet, Vermont. It was originally chartered as part of Lyman.

McIndoe Falls is an unincorporated community within the town of Barnet, Vermont, in the United States. It is located in the southeastern corner of Barnet, along the Connecticut River, the state boundary with New Hampshire. A dam on the Connecticut River at the village forms the McIndoes Reservoir, which extends upstream to the village of Barnet. U.S. Route 5 passes north–south through the village. Interstate 91 bypasses the village to the west, with the nearest access being Exit 18 (Barnet), 3 miles (5 km) to the north. McIndoes Falls Road leads east from the center of the village across the Connecticut River to the town of Monroe, New Hampshire. The next river crossing upstream is 2 miles (3 km) to the north near Barnet village, and the next crossing downstream is 8 miles (13 km) south where U.S. Route 302 crosses between Wells River, Vermont, and Woodsville, New Hampshire. McIndoe Falls has a separate ZIP code (05050) from the rest of Barnet. McIndoe Falls was also referred to as McIndoes or McIndoes Falls. The historic McIndoes Academy building is in the village. An 1875 map shows McIndoes Falls. The post office established in 1885 was named McIndoes Falls.

McIndoes Reservoir is a 545-acre (2.21 km2) impoundment on the Connecticut River on the boundary between Vermont and New Hampshire in northern New England. The dam forming the reservoir lies between the communities of McIndoe Falls, Vermont, and Monroe, New Hampshire. Monroe Road (Frazier Road) crosses the reservoir 600 feet (180 m) north (upstream) of the dam, leading west 0.2 miles (0.3 km) to U.S. Route 5 in McIndoe Falls and east the same distance to New Hampshire Route 135 in the center of Monroe. The next river crossing upstream is a bridge carrying the North Monroe Road (Barnet Road), 1.5 miles (2.4 km) north of McIndoe Falls. McIndoe Falls Dam creating the reservoir was built in 1931 as a project of the New England Electric System, along with the nearby Frank D. Comerford Dam. The McIndoes Station power plant has a capacity of 11 megawatts. Both dams are now owned and operated by TransCanada Corporation.