What is the Largest Man Made Lake in Washington?

Proceed Studying To See This Wonderful Video

The US has a number of pure and man-made lakes, and they’re situated throughout the 50 states of the nation. Washington, the capital of the nation, has 14 man-made lakes. Learn on to find essentially the most attention-grabbing details in regards to the largest man-made lake in Washington.

The Largest Man-Made Lake In Washington

What is the Largest Man Made Lake in Washington?
The biggest reservoir in Washington is Lake Roosevelt.

©Steve Bower/Shutterstock.com

Franklin Roosevelt Lake (formally generally known as the Columbia Lake or Empire Lake) is the biggest man-made lake (reservoir) in Washington and the sixth largest reservoir within the nation. It was created in 1941 after the development of the Grand Coulee Dam on the Columbia River throughout the tenure of President Franklin Roosevelt, whom the lake was named after.

Roosevelt Lake is the biggest supply of hydroelectric energy within the nation. However way more than this, the lake serves a number of different functions, together with irrigation and water provide. The lake additionally supplies loads of recreation alternatives and serves as a wildlife habitat. The lake can be the house of the “Lake Roosevelt Nationwide Recreation Space” and is managed by the Bureau of Reclamation.

The scale of the lake is roughly 80,000 acres, and it extends over 149 miles between the US-Canada boundary and the Grand Coulee Dam. Its shoreline is about 602 miles, with the capability to retain about three cubic miles of water. Roosevelt Lake is so huge that components of it may be seen in about 5 counties within the northeastern a part of Washington. These embody Ferry County, Lincoln County, Stevens County, Grant Nation, and Okanogan.

The primary supply of influx to Franklin Roosevelt Lake is the Columbia River. Nevertheless, it additionally will get water from different rivers, such because the San Poil and Spokane rivers. The water stage on this reservoir fluctuates relying on the season of the yr. Franklin Roosevelt Lake provides water to the Grand Coulee Dam and serves the Lake Roosevelt Nationwide Recreation Space as effectively. 

Historical past of the Largest Lake in Washington

Earlier than a dam was constructed over it, the Columbia River flooded continually, affecting the lives of Native People that lived within the area again within the 1900s. Whereas the principle objective of the bogus lake was to guard the residents of Washington, its development additionally served an financial objective as a result of it coincided with the Nice Melancholy. 

Throughout this era, the US confronted unemployment and different financial maladies. The then-president, Franklin Roosevelt, created tasks to sort out these points. The development of the Grand Coulee Dam alongside the Colombia River was one in all such tasks. The purpose was to help the financial system, cut back flooding incidences, and function a reservoir. 

After the dam was accomplished in 1933, the Bureau of Reclamation named the impoundment behind the dam the Columbia Reservoir. It was also referred to as the “Empire Lake” within the early years of its completion. Three months after the demise of Franklin Roosevelt in 1945, the title of the lake was modified to Franklin Roosevelt Lake in his honor. Nevertheless, the lake’s surrounding space, just like the “Coulee Dam Leisure Space,” was not re-named till 1997.

Wildlife of the Franklin Roosevelt Lake

Yow will discover walleye in Lake Roosevelt.


There are 75 species of mammals, 10 species of amphibians, 200 species of birds, 15 species of reptiles, and 30 species of fish dwelling within the Franklin Roosevelt Lake and surrounding areas. The lake is dwelling to various fish species just like the smallmouth bass, walleye, burbot, bluegill, brook trout, brown trout, kokanee, sign crayfish, and mountain whitefish.

A number of giant mammals are discovered within the space round Lake Roosevelt. These animals embody black bears, elk, deer, javelins, mountain lions, foxes, and bobcats. 

Roosevelt Lake reptiles and amphibians that may be discovered within the watershed embody the bullfrog, bullsnake, western rattlesnake, western toad, Sonoran mud turtles, and varied salamanders. Birds just like the Canadian geese, songbirds, grebes, snow geese, red-tailed hawks, blackbirds, mallards, and snipes are discovered on the lake as effectively.

Roosevelt Lake and the encircling leisure space usually are not solely dwelling to widespread animal species, but in addition to some endangered species. These embody the bald eagles, Canada lynx, peregrine falcons, grey wolf, woodland caribou, and bull trout.

There are additionally some animal species within the space which can be listed as threatened. A few of them embody white sturgeon, Columbia noticed frog, bull trout, Columbia sharp-tailed grouse, and ferruginous hawk.  

Environmental and Financial Influence of the Largest Man-made Lake in Washington

The Franklin Roosevelt Lake is a man-made lake with an influence on the atmosphere, financial system, and other people of Washington. Primarily, the lake helps to manage the water stage of the Columbia River to maintain it from flooding downstream. The Franklin Roosevelt Lake can be used for irrigation and as a supply of water provide to shut communities. Water provide from the lake additionally helps with agricultural actions within the space.

The lake and the world round it additionally function a rest heart for folks. It supplies an array of away-from-home adventures with a lot of leisure actions similar to boating, tenting, fishing, and swimming. The leisure actions enhance the financial system of the locals via tourism. Hydroelectric energy from the dam additionally contributes positively to the native financial system.

Moreover, the lake has contributed immensely to the preservation and safety of the native ecosystem in Washington. It’s a habitat for various species of fish, birds, reptiles, and mammals. It serves as a protected haven for threatened and endangered species within the state.

The Roosevelt Lake additionally serves as a cultural and historic preservation of the individuals who lived there earlier than the Grand Coulee Dam was constructed.


The US has over 53,000 man-made lakes, with lovely recreation facilities to get pleasure from and expertise nature at its best. Franklin Roosevelt Lake is the biggest within the State of Washington and is of financial and ecological significance to the folks and wildlife of the state. 

Up Subsequent:

Leave a Reply