The Dalles Dam

The Dalles Dam
Name	The Dalles Dam
Country	United States
Location	Columbia River near The Dalles, Oregon, Klickitat County, Washington
Purpose	Hydroelectric power, navigation, flood control
Status	Operational
Construction began	1952
Opening	1957
Owner	United States Army Corps of Engineers
Operator	United States Army Corps of Engineers
Dam type	Concrete gravity, spillway
Dam height	200 ft (approx.)
Reservoir	Lake Celilo
Plant operator	Bonneville Power Administration
Plant capacity	1,810 MW (approx.)

The Dalles Dam The Dalles Dam is a major hydroelectric and navigation facility on the Columbia River near The Dalles, Oregon and the Columbia River Gorge National Scenic Area. Conceived during mid-20th century regional development efforts, it was built to provide flood control, generate electricity for the Pacific Northwest and facilitate river navigation. The project involved federal agencies and shaped relationships among regional governments, Indigenous nations, and energy institutions.

History

Planning for the dam arose amid post-World War II infrastructure expansion involving the Tennessee Valley Authority-era ethos, the U.S. Bureau of Reclamation, and the United States Army Corps of Engineers. Debates involved representatives from Oregon, Washington, and federal legislators including members of the United States Congress committees on public works and energy. The site at the upper end of the Columbia River Gorge was proximate to historic landmarks such as Celilo Falls and trade routes used by Chinookan peoples, Nez Perce, and other Indigenous nations, and the project intersected with treaties like the Treaty of 1855 (WASC) contextually through impacts on fishing rights adjudicated later in cases analogous to United States v. Washington. Labor organizations including the American Federation of Labor and the Congress of Industrial Organizations influenced construction workforce policies, while utilities such as Portland General Electric and agencies like the Bonneville Power Administration negotiated power allocation. Opposition and mitigation discussions involved conservationists affiliated with groups like Sierra Club and regional planners from the Columbia River Inter-Tribal Fish Commission.

Construction and Design

Construction began in the early 1950s under the supervision of the United States Army Corps of Engineers with design input from engineering firms experienced in large concrete gravity dams similar to projects at Grand Coulee Dam and Bonneville Dam. The dam integrates a concrete spillway, navigation locks modeled after designs used on the Mississippi River and powerhouses comparable to those at McNary Dam and John Day Dam. Turbine and generator equipment were procured from manufacturers with pedigrees at facilities such as Westinghouse Electric Corporation and General Electric. Engineering standards referenced by designers included practices promulgated by the American Society of Civil Engineers and flood-frequency analyses akin to those used for Hoover Dam. Construction employed thousands of workers, many represented by the International Brotherhood of Electrical Workers and Operating Engineers Union, and required coordination with agencies like the U.S. Army Corps of Engineers Seattle District and the U.S. Fish and Wildlife Service for mitigation measures.

Operations and Power Generation

The project is operated by the United States Army Corps of Engineers with generation marketed and dispatched by the Bonneville Power Administration, which balances reservoirs and transmission across the Northwest Power and Conservation Council footprint. The powerhouse contains multiple Kaplan-style turbines comparable to installations at Waker Dam-class plants, producing peaking and baseload power fed into the Western Interconnection and transmitted via substations operated by entities like Pacific Power and Avista Corporation. Power sales contracts involve municipal utilities such as Portland General Electric and investor-owned utilities regulated by the Oregon Public Utility Commission and the Washington Utilities and Transportation Commission. Operations coordinate with upstream storage at John Day Dam and downstream releases affecting navigation maintained by the U.S. Army Corps of Engineers Portland District and river traffic by agencies like the U.S. Coast Guard.

Environmental and Ecological Impacts

The dam inundated Celilo Falls and transformed riverine habitat, affecting salmonid runs historically managed by tribal fisheries from the Confederated Tribes of the Warm Springs Reservation of Oregon and the Yakama Nation. Impacts on species including Chinook salmon, Coho salmon, and Steelhead prompted mitigation programs coordinated by the Columbia River Inter-Tribal Fish Commission, National Marine Fisheries Service, and state fish agencies such as the Oregon Department of Fish and Wildlife. Fish passage structures and juvenile bypass systems were modeled after innovations at Bonneville Dam and McNary Dam and informed by research at institutions like Pacific Northwest National Laboratory and Oregon State University. Concerns about changing sediment regimes involved studies by the United States Geological Survey and environmental assessments guided by National Environmental Policy Act processes. Riparian vegetation shifts affected wetland birds monitored by organizations like Audubon Society and habitat restoration projects funded through programs linked to the Bonneville Power Administration mitigation funds.

Cultural and Social Effects

Inundation of Celilo Falls erased a centuries-old cultural and economic hub for Chinookan and other Indigenous communities, displacing fishers and altering treaty-protected practices overseen by bodies such as the Columbia River Inter-Tribal Fish Commission and litigated in forums influenced by United States v. Oregon-style precedents. Local economies in The Dalles, Oregon, Hood River, Oregon, and Klickitat County adjusted from riverine trade to industries including hydroelectric services, agriculture served by irrigation districts like the Wasco County Soil and Water Conservation District, and shipping via inland ports such as Port of The Dalles. Social changes involved demographic shifts documented in studies by University of Oregon and Portland State University, while museums including the Columbia River Maritime Museum and cultural centers run by tribal organizations preserve histories of pre-dam lifeways.

Recreation and Tourism

Reservoir creation produced Lake Celilo, supporting boating, angling, and scenic tourism connected to the Columbia River Gorge National Scenic Area and attractions like Crown Point State Park and Multnomah Falls. State parks such as The Dalles Waterfront Trail and recreational services operated by county parks and private outfitters expanded offerings including windsurfing popularized in zones near Hood River and guided cultural tours coordinated with tribal visitor centers. Recreation management involves agencies like the U.S. Forest Service and the Oregon Parks and Recreation Department, with attention to invasive species surveillance by the Oregon Invasive Species Council.

Future Developments and Management

Future planning addresses climate-driven hydrology changes studied by the Intergovernmental Panel on Climate Change and regional modeling by the Northwest Power and Conservation Council. Upgrades may involve turbine retrofits similar to projects at Bonneville Dam and sediment management strategies informed by U.S. Geological Survey research. Ongoing negotiations among the Bonneville Power Administration, tribal governments including the Confederated Tribes and Bands of the Yakama Nation, state agencies such as the Washington State Department of Ecology, and conservation organizations like The Nature Conservancy aim to balance power, habitat restoration, and cultural preservation. Adaptive management frameworks draw on collaborations with universities including Oregon State University and federal science agencies like the National Oceanic and Atmospheric Administration to guide reservoir operations, fish passage technology, and regional energy planning.

Category:Dams on the Columbia River Category:Hydroelectric power stations in Oregon Category:United States Army Corps of Engineers dams