The Largest Dam in Each of the 50 States

For the formation of lakes and water management, dams are essential. Reservoirs are man-made lakes created as river water behind the dams rises. The water from the dams can be used for drinking water and as a source of power for towns. Dams come in four varieties: buttress, arch, gravity, and embankment dams.


In America, this is the most prevalent kind of dam. These constructions are composed of clay or rock. To prevent leakage through the cracks in the rock, they may have clay coatings.


These are dams made of concrete that retain water by using their own weight. The water-retention side of the dam is straight. Gravity Dam construction is costly as well because a lot of concrete is used.


This kind buffers the dam on the downstream side with a set of buttresses or supports.


Their form is curved. The water is held in the reservoir by their curved shape. They don’t require as many materials and are thinner than other types of dams.

There are more than nine thousand dams in the United States! The figures encompass those residing in the US territory of Puerto Rico and Guam as well. The biggest dams in each of the 50 states will be discussed in this article. The ones in the US territories of Puerto Rico and Guam will not be included in this.

Hoover Dam Is The Largest Dam In Arizona and Nevada!

This entry includes entries from both Nevada and Arizona. The height of the Hoover is 726 feet. It’s a gravity dam and arch. This structure, which was built in 1936, has assisted with irrigation, energy production, and flood control near the Colorado River, which separates Nevada and Arizona. The Hoover required 3.3 million cubic feet of concrete to construct.

Green Lake Dam In Alaska

In comparison to the other structures on this list, this one is rather new. It is 160 feet high and 1,130 feet long. The facility is involved in water conversion and is situated south of Sitka, Alaska. Sitka, Alaska is located in the Gulf of Alaska on Banarof Island’s western coast. Green Lake, a naturally occurring lake nourished by glacier runoff, is impoundment.

Lewis Smith Dam In Alabama

The height of the Lewis Smith building is 300 feet. It contributed to Lewis Smith Lake’s formation in 1961. Its primary goals are to assist in managing river flow and generating hydroelectric power along the Black Warrior River’s Sipsey Fork. Relocating a number of homes and tombs helped create the structure’s pathway. However, historically, it’s unknown how many homes and people were affected by its construction. There are two electric generators within.

Bull Shoals Dam In Arkansas

Many households and businesses in Arkansas and Missouri benefit from the electricity provided by this entry from Arkansas. The massive Bull Shoals is 2,566 feet in length. Bull Shoals Lake was similarly formed by the concrete gravity dam. With seventeen gate bays and a total capacity of 112,000 cubic feet per second, its spillways are rather impressive. In order to mitigate possible floods, the White River’s water flow is regulated in part by the Bull Shoals structure.

Oroville Dam In California

The Oroville structure is an embankment dam in Oroville, California, at 770 feet tall. The tallest dam in the country is located in Northern California. It impounds the second-biggest man-made reservoir in the US, Lake Oroville. Oroville is used extensively in flood control, hydroelectric power generation, and water regulation. It has managed the Feather River’s flow since its founding in 1968 in order to serve industrial water supply businesses in Southern California and the San Joaquin Valley with irrigation.

The primary and emergency spillways seemed to be crumbling in 2017. It resulted in the more than 100,000 people being evacuated. The emergency evacuation was lifted as soon as the water level dropped below the emergency spillway levels.

Morrow Point Dam At Colorado

The Morrow Point Dam is a 468-foot-tall concrete arch construction. It is in the Upper Black Canyon on the Gunnison River. The building is located inside the Curecanti National Recreation Area and forms the Morrow Point Reservoir. The production of hydroelectric power is its main objective.

The Colebrook River Dam In Connecticut

The Colebrook River Dam is Connecticut’s biggest dam. At Farmington River, the construction is shaped like an embankment. It was completed in 1969. It measures 223 feet high by 1,300 feet long. Since its beginning, it has lessened the Farmington River’s catastrophic flooding as well as the Connecticut River’s downstream flooding. These days, the dam provides reservoirs that people use for leisure.

Edgar M. Hoopes Dam In Delaware

The Edgar M. Hoopes Dam is the biggest dam in Delaware. It bears Edgar M. Hoopes’ name, the chief engineer of the Wilmington Water Department. The 135-foot-tall building is known by the moniker Old Mill Stream Dam. It provides service to Delware’s largest reservoir, the Hopes Reservoir. In 1932, during the height of the Great Depression, this structure was built. For leisure purposes, the project designers included park seats, trails, and monuments.

Jim Woodruff Dam In Florida

The Jim Woodruff Dam is located in Sneads, Florida. At ninety-two feet, it’s among the tiniest dams on our list. It impounds Lake Seminole to guarantee appropriate water quality, help with river transportation, and provide hydroelectric power. A businessman from Georgia named James Woodruff Sr. contributed money to assist build the concrete gravity structure.

Carters Dam In Georiga

The massive embankment dam on the Coosawaatee River is 445 feet tall. Its primary goals are power generating and flood control. Carters Lake, with its sixty-two miles of shoreline and 450 feet of depth, was formed by this embankment structure.

Alexander Dam In Hawaii

The Alexander Dam is Hawaii’s largest dam. The structure of the embankment is 125 feet high and 620 feet long. With its 800 million gallon capacity, it can provide irrigation for Wahiawa Stream Mauka’s sugar cane plantations.

Dworshak Dam In Idaho

The North Fork of the Clearwater River is home to this building in Idaho. It aids in the production of hydroelectric power and flood control. Not only is it the third highest concrete dam in the Western Hemisphere, but it’s also the third tallest dam in the United States. Almost 140,000 people visit the three thousand-foot-long concrete gravity structure each year, making it a popular tourist destination these days.

Lake Shelbyville Dam In Illinois

The construction is 3,025 feet long and stands at a height of 128 feet. Concrete and earthfill are used in its construction. To increase the structure’s strength, an internal steel framework buttresses it. It contains five parks surrounding the building site and impounds the Kaskaskia River. There are five marinas available around Lake Shelbyville, in addition to a number of lakeside campers and resorts. Among Illinois’s deepest lakes is Lake Shelbyville.

Brookvale Lake Dam In Indiana

Located in Brookvale Township, Franklin County, Indiana, the structure stands 181 feet tall. This embankment structure aids in the impoundment of the Whitewater River’s east fork. The greatest amount of acre-feet that the embankment can hold is 359,600.

Coralville Dam In Iowa

In 1958, this earth-fill building opened. In Johnson County, Iowa, it produced Coralville Lake’s man-made reservoir. This 132-foot building aids in the Mississippi River’s impoundment. With eleven leisure zones, four beaches, three campgrounds, eighteen boat ramps, and seven trails totaling twenty-nine miles in length, Coralville Lake offers a wide range of recreational possibilities these days.

Cedar Bluff Dam In Kansas

The Smoky Hill River is partially contained by the 12,560 foot long and 202 foot tall Cedar Bluff Embankment. Helping to keep Kansas from experiencing extreme floods is one of the embankment’s goals. 445,095 acres-feet of flood water are under its control. Cedar Bluff Lake was created by the Smoky Hill River being impoundment. Given that Kansas is a large agricultural state with a heavily dependent agricultural economy, the structure aids in conserving water for irrigation.

Dix River Dam In Kentucky

The Dix River Dam, which is 287 feet tall, aids in the impoundment of the river. In Kentucky, it lies between Mercer and Garrard Counties. It’s less known for impounding the Kentucky River and more for building the well-known Herrington Lake. Fortunately, it keeps the river from flooding too much and produces hydroelectricity.

Toledo Bend Dam In Louisiana

Toledo Bend is located between Texas and Louisiana on the Sabine River. Standing at 185 feet, it forms the largest artificial reservoir in the southern United States, Toledo Bend Reservoir. Toledo Bend is a building made of earth fill.

Harris Station Dam In Maine

In Maine, this construction impounds the Kennebec River. This 175-foot concrete gravity structure contributes to the Northeast Somerset region’s hydroelectric power generation. Moosehead Lake is twelve miles from Harris Station. From 1952 to 1954, this building was a part of the Indian Pond Project.

Conowingo Dam In Maryland

Conowingo Reservoir is the product of this 94-foot-tall structure. It is located close to Conowingo, Maryland, at the Susquehanna River’s lower end. It is located five miles from the Pennsylvania border, 45 miles from Baltimore, and nine miles from the Chesapeake Bay. When it was first constructed, it had fifty-three flood control gates and eleven turbine sites.

Wachusett Dam In Massachusettes

The Massachusetts entry on this list is the Wachusett Dam. The 205-foot-tall tower is a component of the Nashua River Watershed and the Greater Boston Water System. It was the biggest reservoir for public water supply in the world when it was finished in 1905. At the time, the project gave immigrants thousands of jobs. Because homes, schools, and churches were demolished during construction, it had an impact on the neighborhood. It was necessary to dig up over 4,000 bodies and transfer them to a new Catholic cemetery.

The Hardy Dam In Michigan

This 2,600-foot long, 120-foot-tall structure is located along the Muskegon River. The structure has formed rivers and reservoirs that are home to a variety of species.

Rapidan Dam In Minnesota

The Rapdian/Blue Earth Construct, a gravity concrete construction rising to a height of 87 feet, is erected to impound the Blue Earth River within the Rapidan Township. The completion year was 1910. Its function is to support the adjacent power plant station’s hydroelectric power generating. The building is located in Minnesota, directly southwest of Mankato. Along the reservoir’s banks and the location of the structure are parks, camping, and river access points.

Sardis Dam In Mississippi

The Sardis is ninety-seven feet tall and more than fifteen thousand feet long. In Lafayette, Mississippi, the barrier dammed the Tallahatchie River and created Sardis Lake. As part of the Yazoo River Headwater Projects, this building was constructed to aid with flood management, particularly along the Mississippi River. Its hydraulic fill helps form the Earth fill by grabbing soil beneath the construction site. The Flood Control Act of 1936 is to blame for this.

Table Rock Dam In Missouri

Standing at a height of 220 feet, the Table Rock structure spans 6,400 feet above the White River. Residents of Branson, Missouri, frequent it as a fishing destination. The Missouri Department of Conservation maintains a fish hatchery downstream from the location, which is used to supply trout for Lake Taneycomo, another lake downstream.

Montana Hungry Horse Dam

More than two million cubic yards of concrete went into building this 564-foot-tall colossus. It facilitates river regulation, hydropower production, recreational activities, flood control, and irrigation. Hungry Horse is located in Northwest Montana along the South Fork of the Flathead River. Fish that are migrating to the Pacific Ocean and the Columbia River Estuary are assisted by Hungry Horse.

Medicine Creek Dam In Nebraska

Medicine Creek is impoundd by the 165-foot-tall Earth-fill Medicine Creek Dam. It’s in Nebraska’s Frontier County. To prevent flooding, this structure impounds the Medicien Creke.

New Hampshire’s Moore Dam

The Moore Dam is an embankment that impounds the Connecticut River. It is 2,920 feet long and 178 feet high. It represents the highest point of the early 1900s-starting Fifteen Miles Fall Hydroelectric Project. 3,490 acres make up the entire surface area of the dam. The Moore Reservation, one of the most undeveloped reservoirs in the New England region with small dwellings and commercial buildings, was built by this project. The reservoir portion of the property is owned by TransCanada, which also grants public access.

New Jersey’s Merrill Creek Dam

The deep reservoir and the water structure are located near Merril Creek. It supplies water to the Delaware River power plants. The intended capacity of the Merril Creek Reservoir is fifteen billion gallons of water.

New Mexico’s Navajo Dam

In the New Mexican county of San Juan is the Navajo Reservoir. The dam, an embankment structure 402 feet high, aids in the impoundment of the San Juan River. It is a key component of the Colorado River Storage Project, which placed a strong emphasis on managing water supplies in the upper Colorado River Basin.

New York’s Lewiston Dam

The Lewiston Dam aids in controlling the water levels of the Niagra River. Constructed in 1956 to replace a collapsing power structure, it stands 389 feet tall. Twenty workers lost their lives building the dam, and more than twelve million cubic yards of rock had to be removed. It employs thirteen generators and contributes to Lake Ontario’s water return in Canada.

North Carolina’s Fontana Dam

The Fontana Dam is 2,365 feet long and 480 feet tall. In North Carolina, it impounds the Little Tennessee River. It is the tallest dam in the Eastern United States with 513,000 acres-feet of flood storage capacity.

North Dakota’s Garrison Dam

The Missouri River is impounded by the 210-foot-tall Garrison Dam, an embankment structure. It is located in Central North Dakota’s Mercer and McLean counties. This dam is one of the six that run beside the Missouri River, measuring eleven thousand feet in length.

William Harsha Dam In Ohio

The largest body of water in Ohio aids in Little Miami River impoundment. It spans the Little Miami River and is 1,450 feet long and 200 feet high. It’s a rock-fill construction that repairs its fissures with earth and clay components.

Oklahoma Broken Bow Dam

Overlooking the Mountain Fork River is the Broken Bow structure. It is a structure that is almost 2,750 feet long and 225 feet tall. The Flood Act of 1958 authorized the creation of Broken Bow Lake, which boasts more than 180 miles of shoreline. Huge numbers of bass and trout call it home.

Oregon Cougar Dam

A 519-foot-tall rockfill hydroelectric dam that impounds the South Fork McKenzie River is Oregon’s entry on this list. With two turbine generators, it was finished and put into service in 1964. The Blue River Dam powers it. Additionally, it supports fish populations in various bodies of water around the Northwestern United States by storing and reducing them.

Raystown Dam In Pennsylvania

In Huntingdon County, Pennsylvania, the 1,700-foot-long and 225-foot-tall Earthfill structure aids in the impoundment of the Raystown Branch Juniata River.

Scituate Reservoir Dam In Rhode Island

The Scituate Reservoir is home to the biggest dam in the smallest state in the union. It is an earthfill structure rising to a height of 100 feet that impounds the North Branch Pawtuxet River.

South Carolina’s Jocassee Dam

The largest dam in South Carolina is called Lake Jocassee Dam. It brought about Lake Jocassee. The embankment, which stands 385 feet tall, impounds the Keowee River. 45,700 cubic feet can be held in it in a second. Because of Lake Jocassee, the structure has given people access to recreational activities since it was built in 1973. Many people frequently camp or fish near shorelines.

Oahe Dam In South Dakota

The Missouri River is impoundment by a 245-foot-high embankment located in South Dakota. South Dakota’s Pierre is not far away. The building aids in hydropower production, navigation, and irrigation. The 1944 Flood Control Act gave it permission.

Watauga Dam In Tennessee

The Watauga River is impoundment by a 318-foot-tall rockfill structure located in Tennessee. The construction of the rockfill dam has various benefits, including flood control, irrigation, and recreational opportunities.

Mansfield Dam In Texas

Texas’s entrance is a massive structure rising 278 feet above the Colorado River that aids in its impoundment. The building was finished in 1941. Texas’s 10th Congressional District saw political support thanks to Lyndon B. Johnson. as a result of his structural contributions.

Utah’s Flaming Gorge Dam

It’s amazing to see this 502-foot-tall concrete arch building! As a portion of the Colorado River, it aids in impounding the Green River. As part of the Colorado River Storage Project, which aims to increase water storage throughout the Colorado River, it is one of four storage units. The Flaming Gorge serves as a habitat for numerous trout, bass, catfish, and rattlesnakes.

Vermont’s Waterbury Dam

The Waterbury Dam, which controls the Waterbury Reservoir, is Vermont’s largest dam. Its length is 2,130 feet, and its height is 187 feet. The Winooski River has a history of devastating floods, therefore the dam’s primary goal is to help impound it.The Winooski River rose 10 feet above sea level as a result of the Flood of ’27. Due to the flood, 84 individuals lost their lives. Damage from the flood totaled more than 2.8 million dollars. Many species of animals, including geese, bears, snakes, turtles, and salamanders, call it home today.

Virginia’s Upper Dam At Bath County Pumped Storage Station

The entry from Virginia is a component of a massive plant. It regulates the Little Back Creek’s and Back Creek’s flow. The upper dam is more than 2,200 feet long and 460 feet tall. The Bath County organization was created during the 1970s. The Pumped Storage Station in Bath County can store and drain hydropower as needed, making it akin to a massive battery. In order for coal and nuclear power plants to function effectively, it also helps lower their requirement.

Washington’s Mossyrock Dam

The Mossyrock Dam is Washington’s biggest dam. The Cowlitz River is contained by a concrete arch dam rising to a height of 606 feet. The building was built in 1968 and has been providing electricity to the counties and towns nearby. In 2006, additional electric turbines were installed to aid in the production of more power.

West Virginia’s Pentwell Dam

The state’s floods has been managed by the Summersville Dam since was opened in 1966. The Gauley River is contained by the 390-foot-tall rockfill construction.

Wisconsin’s Hatfield Dam

The Penwell Dam is the tallest dam in Wisconsin. At 44 feet tall, the Pentwell structure is the smallest on this list. This building, which occupies more than 23,000 acres, aids in the production of electricity and the prevention of flooding.

Buffalo Bill Dam In Wyoming

The enormous Wyoming building is located in Wyoming’s northwest and rises to a height of 325 feet. It’s an arch-gravity concrete construction that holds the Shoshone River back.