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Banks Lake
Location of Banks Lake in Washington, USA.
Location of Banks Lake in Washington, USA.
Banks Lake
Location in Washington (state)
Location of Banks Lake in Washington, USA.
Location of Banks Lake in Washington, USA.
Banks Lake
Location in the United States
Location Grant / Douglas counties, Washington, United States
Coordinates 47°37′12″N 119°18′27″W / 47.62000°N 119.30750°W / 47.62000; -119.30750
Type reservoir
Basin countries United States
Max. length 31 mi (50 km)
Surface area 26,886 acres (10,880 ha) (42 mi²)
Average depth 46 ft (14 m)
Max. depth 177 ft (54 m)
Water volume 1,237,000 acre feet (1.526×109 m3)
Shore length1 135 mi (217 km)
Surface elevation 1,571 ft (479 m)
1 Shore length is not a well-defined measure.

Banks Lake is a 27-mile (43 km) long reservoir in central Washington in the United States.

Part of the Columbia Basin Project, Banks Lake occupies the northern portion of the Grand Coulee, a formerly dry coulee near the Columbia River, formed by the Missoula Floods during the Pleistocene epoch. Grand Coulee Dam, built by the United States Bureau of Reclamation on the Columbia River created Franklin D. Roosevelt Lake, the reservoir on the river behind the dam. The surface of Lake Roosevelt is several hundred feet above the original Columbia River, making it easier to pump water 280 feet (85 m) up and out of the river's canyon into the adjacent Grand Coulee. Two low earth-fill dams, Dry Falls Dam and North Dam, keep the water in the Grand Coulee, thus creating the reservoir named Banks Lake. It is named after Frank A. Banks, the construction supervisor at Grand Coulee Dam.

At the north end of Banks Lake the city of Grand Coulee and the town of Electric City are located. Steamboat Rock State Park is in the north-central portion. The town of Coulee City is at the south end of the lake. From the south end, the water stored in Banks Lake is distributed over a large region for irrigation of the Columbia Basin Project.

Satellite photo

In this summertime photo, the land appears in shades of beige, brown, and green. In contrast to the rugged, irregular contours of local peaks, cultivated land appears as a network of rectangles, some deep green, others beige or tan. Bright green dots reveal fields watered with center-pivot irrigation systems. The greatest concentration of agricultural fields occurs south of the dam. North of the reservoir, vegetated hills predominate. Flatter terrain not under cultivation appears gray-beige, likely resulting from sparse vegetation, especially in the northwest.

Grand Coulee NASA
Banks Lake, Grand Coulee Dam, and Franklin D. Roosevelt Lake 1999 Landsat photo
  • Kirk, Ruth and Carmela Alexander (1995) Exploring Washington's Past: A Road Guide to History, Revised Edition, University of Washington Press, Seattle (1990, revised edition 1995). ISBN: 0-295-97443-5
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