FRANKLIN ROOSEVELT LAKE AT GRAND COULEE DAM

Reservoir Levels Weather Hydrology


Grand Coulee, located in Okanogan, Washington, is a concrete gravity dam on the Columbia River that was completed in 1941 by the Bureau of Reclamation. Standing at a height of 550 feet with a hydraulic height of 380 feet, this dam serves the primary purpose of flood risk reduction along with irrigation. With a normal storage capacity of 9,562,000 acre-feet and a maximum discharge of 265,000 cubic feet per second, Grand Coulee plays a crucial role in managing water resources in the region.

Owned and operated by the Bureau of Reclamation, Grand Coulee is a significant structure with a high hazard potential and very high risk assessment. The dam spans a length of 5,673 feet and has a spillway width of 1,485 feet, showcasing its impressive scale and engineering design. While the condition assessment of the dam is not available, regular inspections and emergency action plans are in place to ensure its safety and reliability in the face of potential hazards.

As a key component of the water infrastructure in the area, Grand Coulee contributes to the management of the Columbia River and plays a vital role in water supply, flood control, and irrigation for the region. With its strategic location and impressive specifications, this dam stands as a testament to human ingenuity in harnessing and managing water resources amidst changing climatic conditions.

October 9, 2024

°F

°F

mph

Windspeed

%

Humidity

Lake Or Reservoir Water Surface Elevation Above Ngvd 1929, Ft 24hr Change 0%
Percent of Normal 100%
Minimum 1,217.69 ft
2011-05-07
Maximum 1,290 ft
2011-08-02
Average 1,285 ft
Dam_Height 550
Hydraulic_Height 380
Drainage_Area 74100
Year_Completed 1941
Nid_Storage 9562000
River_Or_Stream COLUMBIA RIVER
Structural_Height 550
Primary_Dam_Type Concrete
Foundations Rock
Surface_Area 82300
Dam_Length 5673
Hazard_Potential High
Nid_Height 550

Regional Streamflow

658

Cubic Feet Per Second

3

Cubic Feet Per Second

0

Cubic Feet Per Second

54

Cubic Feet Per Second
5-Day Weather Forecast

16-Day Weather Forecast

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Conconully State Park


Conconully State Park is a popular tourist destination located in Okanogan County, Washington. The park covers 81 acres and is situated in the small town of Conconully. The park is surrounded by beautiful scenery, including two lakes, forests, and the Okanogan River. One of the main reasons to visit Conconully State Park is to enjoy outdoor recreational activities. Visitors can go fishing, boating, swimming, hiking, and camping. The park features two boat launch areas, a swimming area, and a playground. Another point of interest in the park is the historic Conconully Dam. Built in the early 1900s, the dam has ...