Banks Lake

Banks Lake
Name	Banks Lake
Location	Grant County, Washington, Douglas County, Washington
Type	Reservoir
Inflow	Grand Coulee Dam discharge, Feeder canal (Grand Coulee)
Outflow	Grand Coulee Canal
Basin countries	United States
Area	27,000 acres
Max-depth	180 ft
Volume	1,850,000 acre-feet
Elevation	1,580 ft

Banks Lake Banks Lake is a large reservoir in central Washington (state) created to support the Columbia Basin Project and irrigation in the Columbia Plateau. The impoundment stores water pumped from Franklin D. Roosevelt Lake behind Grand Coulee Dam and conveys it through a network of canals and pumping plants to agricultural lands in Grant County, Washington and Douglas County, Washington. The lake is closely associated with major New Deal–era infrastructure and mid-20th century water engineering projects.

Overview

Banks Lake spans roughly 27,000 acres between the Grand Coulee basalt walls, forming a long, narrow reservoir used primarily for irrigation, flood control, and recreation. The reservoir receives pumped water via the Coulee Dam–era pumping system from Franklin D. Roosevelt Lake and releases flows into the Grand Coulee Canal for delivery to the Potholes Reservoir and the rest of the Columbia Basin Project. The impoundment lies adjacent to the Steamboat Rock State Park peninsula and is framed by lands managed by the Bureau of Reclamation and the Washington Department of Fish and Wildlife.

History and Construction

Construction of the pumping and canal system that created the reservoir was a component of the broader Columbia Basin Project, a United States Bureau of Reclamation initiative authorized under programs promoted during the Great Depression and expanded under wartime mobilization. The development followed the completion of Grand Coulee Dam in 1942 and the later authorization of the Main Canal and pumping plants in the late 1940s and 1950s. Engineering on the site incorporated techniques refined by firms and agencies such as U.S. Army Corps of Engineers contractors and private engineering companies involved in post-World War II infrastructure. The reservoir basin is the scoured remnant of prehistoric floods studied by geologists like J Harlen Bretz, whose work on the Missoula Floods and the Channeled Scablands informed the understanding of the local geomorphology.

Geography and Hydrology

The lake occupies a segment of the Grand Coulee carved into Columbia River basalts, bounded by high cliffs and benches that reflect episodic flood incision from Pleistocene events. Hydrologically, water is lifted from Franklin D. Roosevelt Lake at the pumping plant near Grand Coulee Dam into an upper reservoir and conveyed through the Feeder canal (Grand Coulee) into the impoundment. From there, the Grand Coulee Canal and a series of lateral canals distribute water to irrigation districts such as the East Columbia Basin Irrigation District and the West Canal Company. Seasonal management coordinates with the Bonneville Power Administration power generation schedules and federal water allocation rules stemming from the Reclamation Act and subsequent legislation affecting western water projects.

Ecology and Wildlife

The reservoir and its shoreline provide habitat for species characteristic of the Columbia Plateau and riparian niches, including westslope cutthroat trout and introduced walleye populations managed for angling. Aquatic plants and invertebrate communities support migratory bird concentrations that use nearby wetlands and state parks, attracting species observed on the Pacific Flyway such as American white pelican, Canada goose, and great blue heron. Fishery management is conducted by the Washington Department of Fish and Wildlife in coordination with U.S. Fish and Wildlife Service programs, which also address issues of invasive species like zebra mussel monitoring and habitat restoration projects linked to native salmonid conservation efforts in the broader Columbia River Basin.

Recreation and Tourism

Banks Lake is a regional destination for boating, angling, camping, and hiking anchored by facilities at Steamboat Rock State Park, which offers campgrounds, marinas, and interpretive trails. Recreational fishing targets include smallmouth bass, walleye, and trout, supported by stocking and creel surveys by state agencies and local fishing clubs and outfitters. Water-based events and regional tourism intersect with nearby attractions such as the Grand Coulee Dam visitor center, the Dry Falls geological site, and communities like Coulee City and Electric City, generating year-round visitation that supports hospitality and outdoor recreation businesses.

Management and Operations

Operational control involves the Bureau of Reclamation for water storage and distribution, coordination with the Grant County Public Utility District, and stakeholder irrigation districts that hold water rights and repayment obligations under federal project contracts. Routine operations encompass pumping schedules, maintenance of the Feeder canal (Grand Coulee), seasonal drawdown planning, and coordination with hydroelectric scheduling at Grand Coulee Dam and transmission entities like the Bonneville Power Administration. Environmental compliance necessitates adherence to statutes and regulatory actions overseen by agencies including the Environmental Protection Agency and state-level natural resource departments.

Cultural and Economic Impact

The reservoir fundamentally transformed settlement, agriculture, and employment patterns across the Columbia Basin, enabling irrigation-driven crops such as potatoes, wheat, and apples cultivated by farmers in entities like the Columbia Basin Growers Association and local cooperatives. The project influenced demographic shifts, the growth of towns such as Moses Lake, and recreational economies tied to outdoor tourism and boating services. Cultural narratives reflect interactions between Euro-American development and regional Colville Confederated Tribes and other Indigenous communities whose ancestral landscapes and treaty rights intersect with modern water management and land-use debates.

Category:Lakes of Washington (state) Category:Reservoirs in the United States