Haddam Island State Park

The Thankful Arnold House Museum is an American historic house museum in Haddam, Connecticut. It consists of a gambrel-roofed house built circa 1800, along with a garden and grounds. The museum is open year-round.

The James Hazelton House, also known as the Hazelton-Hayden House, is a historic house at 23 Hayden Hill Road in Haddam, Connecticut. With a construction history dating to about 1720, it is one of the town's oldest buildings, with a long history of ownership by a single prominent local family. The house was listed on the National Register of Historic Places in 1988, and is a contributing property in the Haddam Center Historic District.

The Haddam Center Historic District is a 267-acre (108 ha) historic district encompassing the institutional and residential center of the town of Haddam, Connecticut that was listed on the National Register of Historic Places in 1989 as a result of efforts by the Haddam Historical Society.The town center of Haddam was first laid out in 1662, when land was set aside for a colonial meeting house, a minister's house, and land for the minister. The town's early growth was slow, because the terrain was not very suitable for agriculture. After American independence, the town began to grow more substantially, buoyed by construction of the Middlesex Turnpike along what are now CT 154 and Walkley Hill Road. The town center grew as a stop on the turnpike, and also benefited from traffic along the Connecticut River, which formed its eastern boundary. The introduction of steamship and railroad traffic beginning around 1850 led to a decline in the town's fortunes.The district is basically linear in nature, extending about 2.5 miles (4.0 km) along CT 154 and Walkley Hill Road. It boasts a fine collection of Federal period residential architecture, and a number of institutional and civic buildings constructed in the mid-19th century out of locally quarried granite. It includes the James Hazelton House, at 23 Hayden Hill Rd., which is separately NRHP-listed, as well as the Brainerd Memorial Library.

Haddam Meadows State Park is a public recreation area occupying 175 acres (71 ha) on the west bank of the Connecticut River in the town of Haddam, Connecticut. The state park offers picnicking, fishing, and a boat launch. Park trails lend access to a diversity of riverside landscapes: marsh, beach, sand bar, fern growths, meadow lands, and hardwood forest. The park was established through the donation of land in 1944 by the Edward W. Hazen Foundation. It is managed by the Connecticut Department of Energy and Environmental Protection.

Connecticut Yankee Nuclear Power Plant (CY) was a nuclear power plant located in Haddam Neck, Connecticut. The power plant is on the Connecticut River near the East Haddam Swing Bridge. The plant was commissioned in 1968, ceased electricity production in 1996, and was decommissioned by 2004. The reason for the closure was because operation of the nuclear power station was no longer cost effective. The plant had a capacity of 582MW. Demolition of the containment dome was completed the week of July 17, 2006. Kenneth Nichols, the deputy to Leslie Groves on the Manhattan Project, was a consultant for the Connecticut Yankee and Yankee Rowe nuclear power plants. He said that while the plants were considered "experimental" and were not expected to be competitive with coal and oil, they "became competitive because of inflation … and the large increase in price of coal and oil." The Connecticut Yankee plant was estimated to cost $100 million.

The Salmon River is formed at the confluence of the Blackledge and Jeremy rivers about one mile west of North Westchester, Connecticut. It drains 96,000 acres and courses for 10.4 miles (16.7 km) to Salmon Cove near Moodus where it flows into the Connecticut River. The Salmon River is probably the largest stream and watershed whose sources and mouth are entirely within the limits of Connecticut.There is a popular paddling route along the Salmon River varying in difficulty from quickwater to Class II whitewater. It begins along River Road about 1/10 of a mile south of the river's formation and continues for about 7 miles to the flatwater of Salmon Cove. The Salmon River's substantial drop in elevation over its course provided considerable water power to the textile mills in Moodus during the 19th and early 20th centuries.

George Dudley Seymour State Park is a public recreation area occupying 222 acres (90 ha) on the east bank of the Connecticut River in the town of Haddam, Connecticut. Hurd State Park abuts the park to the north. The park bears the name of George Dudley Seymour (1859-1945), whose philanthropic efforts enabled the state to purchase land for this and several other Connecticut state parks. It is managed by the Connecticut Department of Energy and Environmental Protection.

Hurd State Park is a public recreation area lying adjacent to George Dudley Seymour State Park on the east bank of the Connecticut River in the town of East Hampton, Connecticut. In addition to offering hiking, picnicking, and mountain biking, it is one of four Connecticut state parks that offer primitive camping for boaters on the Connecticut River.

Machimoodus State Park is a public recreation area located on the Salmon River near the village of Moodus in the town of East Haddam, Connecticut. The state park is bordered by Sunrise State Park to the north and by the Salmon River and Salmon Cove to the west and south. The park is managed by the Connecticut Department of Energy and Environmental Protection.

Sunrise State Park (originally Sunrise Resort State Park) is a public recreation area occupying the site of the former Sunrise Resort in the town of East Haddam, Connecticut. The state park encompasses 143 acres (58 ha) on the east shore of Salmon River and shares an entrance with Machimoodus State Park to the south. The park is managed by the Connecticut Department of Energy and Environmental Protection.

Higganum is a village and census-designated place (CDP) in the town of Haddam, a part of Middlesex County, Connecticut, United States. The population was 2,089 at the 2020 census.

Leesville is a village in the town of East Haddam, Middlesex County, Connecticut, United States, on Connecticut Route 151, north of the town center. It was originally named Lord's Mills after a local vegetable oil watermill, the first in Connecticut.