Washington Reservoirs

Water Levels Capacity Storage
September 29 2023

washington Reservoir Report

September 29 2023

The history of reservoirs and dams in the USA is closely tied to the country's development and growth. Major river systems like the Colorado, Columbia, and Missouri have been extensively dammed to provide water for irrigation, hydropower, flood control, and recreation. Many of these dams were constructed in the mid-20th century, during a period of rapid infrastructure development, and have since played an essential role in the country's economy and society.

The US has a vast network of dams and reservoirs, with over 90,000 dams across the country, including 2,500 major dams. Many of these dams are located on major river systems, such as the Colorado River, where they have significant hydrological impacts on the river's flow and ecosystem. Dams can also have important climatic impacts, influencing the amount of water available for irrigation, and potentially affecting regional climates. For example, the construction of large reservoirs in arid regions like the Colorado River basin can lead to increased evaporation rates, reducing the amount of water available for other uses. Additionally, climate change may exacerbate existing hydrological and climatic concerns, potentially leading to more frequent and severe droughts and floods in certain regions.

Location Observation 24hr Change (%) Percent Normal (%) Elevation (ft)
Wynoochee Lake Near Grisdale
Washington ID 12035380
767 ft -0.07 100 708.35
Mud Mountain Lake Near Buckley
Washington ID 12098000
908 ft -0.76 100 1253.15
Lake Tapps Near Sumner
Washington ID 12101000
541 ft 0 100 531.36
Howard A Hanson Reservoir Near Palmer
Washington ID 12105800
1,133 ft -0.01 100 1206
Chester Morse Lake At Cedar Falls
Washington ID 12115900
1,547 ft 0 100 1565.28
Cedar Lake (Masonry Pool) Near Cedar Falls
Washington ID 12116060
1,517 ft 0.09 100 1548.55
Sammamish Lake Near Redmond
Washington ID 12122000
26 ft 0.23 100 33
South Fork Tolt Reservoir Near Carnation
Washington ID 12147900
1,724 ft 0.04 100 1771
Diablo Reservoir Near Newhalem
Washington ID 12176500
1,201 ft -0.03 100 1046.7
Baker Lake At Upper Baker Dam Near Concrete
Washington ID 12191600
721 ft 0.02 100 730
Lake Shannon At Concrete
Washington ID 12193000
410 ft 0.06 100 443
Franklin Roosevelt Lake At Grand Coulee Dam
Washington ID 12436000
1,284 ft 0 100 1175.16
Osoyoos Lake Near Oroville
Washington ID 12439000
911 ft 0 None 908.56
Lake Chelan At Purple Point At Stehekin
Washington ID 12451200
1,097 ft -0.01 100 1093.1
Lake Chelan At Chelan
Washington ID 12452000
1,097 ft -0.01 100 1100
Lenore Lk Near Soap Lk
Washington ID 12469500
1,075 ft 0 100 1084.47
Soap Lk Near Soap Lk
Washington ID 12470000
1,070 ft 0 100 1078.46
Moses Lake At Moses Lake
Washington ID 12471000
1,046 ft 0 None 1050
Lake Scanewa Near Kosmos
Washington ID 14233490
-999,999 ft None None 827.97
Castle Lake Nr Mount St Helens Nr Spirit Lake
Washington ID 14240446
2,577 ft 0 None 2579.71

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Largest Reservoirs

By water storage capacity

The USA is home to many of the largest dams in the world, providing essential services such as water storage, hydropower generation, and flood control. Among them, Oroville Dam stands out as the tallest dam in the United States, located in northern California. Another famous dam is the Hoover Dam, located on the Colorado River between Arizona and Nevada. It is a major tourist attraction and an engineering marvel of the modern era, providing hydropower and water storage for millions of people.

Other notable dams in the USA include the Glen Canyon Dam in Arizona, which is the second-highest concrete arch dam in the country, and the Grand Coulee Dam in Washington, which is the largest electric power-producing facility in the USA. These dams are a critical component of the country's infrastructure, providing essential services for the economy, society, and the environment.

Reservoir Storage Capacity (acre-ft)

Drought Levels

By water storage capacity

The number and distribution of dams and reservoirs in the USA have been significantly impacted by climate change. The changing climate has led to changes in precipitation patterns, increased evaporation rates, and more frequent and severe droughts and floods in certain regions. These factors have influenced the management and operations of dams and reservoirs across the country.

Reservoir Storage Capacity (acre-ft) Percent of Normal (%)

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