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The Columbia River is the largest river in the Pacific Northwest region of North America. The river forms in the Rocky Mountains of British Columbia, Canada. It flows northwest and then south into the U.S. state of Washington, then turns west to form most of the border between Washington and the state of Oregon before emptying into the Pacific Ocean. The river is 1,243 miles long, and its largest tributary is the Snake River. Its drainage basin is roughly the size of France and extends into seven states of the United States and one Canadian province. The fourth-largest river in the United States by volume, the Columbia has the greatest flow of any river entering the Pacific outside of Asia, and the 36th greatest discharge of any river in the world.
The United States Army Corps of Engineers (USACE) is a direct reporting unit and engineer formation of the United States Army that has three primary mission areas: Engineer Regiment, military construction, and civil works. The day-to-day activities of the three mission areas are administered by a lieutenant general known as the chief of engineers/commanding general. The chief of engineers commands the Engineer Regiment, comprising combat engineer, rescue, construction, dive, and other specialty units, and answers directly to the Chief of Staff of the Army. Combat engineers, sometimes called sappers, form an integral part of the Army's combined arms team and are found in all Army service components: Regular Army, National Guard, and Army Reserve. Their duties are to breach obstacles; construct fighting positions, fixed/floating bridges, and obstacles and defensive positions; place and detonate explosives; conduct route clearance operations; emplace and detect landmines; and fight as provisional infantry when required. For the military construction mission, the chief of engineers is directed and supervised by the Assistant Secretary of the Army for installations, environment, and energy, whom the President appoints and the Senate confirms. Military construction relates to construction on military bases and worldwide installations.
Rocky Reach Dam is a run-of-the-river hydroelectric dam in the U.S. state of Washington owned and operated by Chelan County Public Utility District. It has 11 generators rated in total 1300 MW. The project is on the Columbia River in north central Washington state about seven miles (11 km) upstream from the city of Wenatchee. The dam is 473 miles (761 km) above the mouth of the Columbia. The reservoir impounded by the dam is Lake Entiat. The project provides energy for more than 7 million people throughout the Pacific Northwest.
Wanapum Dam is a run-of-the-river hydroelectric project located on the Columbia River downstream (south) from Vantage, Washington where Interstate 90 crosses the Columbia from Grant County into Kittitas County. It is owned by the Grant County Public Utility District. Its reservoir is named Lake Wanapum.
Priest Rapids Dam is a hydroelectric, concrete gravity dam; located on the Columbia River, between the Yakima Firing Range and the Hanford Nuclear Reservation, and bridges Yakima County and Grant County, in the U.S. state of Washington. The dam is 24 miles south of the town of Vantage, and 47 miles northwest of the city of Richland. It is located at mile marker 397.1 from the mouth of the Columbia. It is owned by the Grant County Public Utility District (PUD). Priest Rapids, for which the dam was named, are now submerged beneath the dam's reservoir.
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Mossyrock Dam is a concrete arch-gravity dam on the Cowlitz River near Mossyrock in Lewis County, Washington, United States. The reservoir created by the dam is called Riffe Lake. The primary purpose of the dam is hydroelectric production while flood control is a secondary function. The dam is the tallest in Washington state and its hydroelectric power station supplies 40% of Tacoma Power's electricity.
The Snohomish County Public Utility District is a public utility agency providing power to over 367,000 customers in Snohomish County and on Camano Island, Washington. It provides water service to about 23,000 customers in the northeast section of the Snohomish County.
The Portland District is one of the five districts within the Northwestern Division of the United States Army Corps of Engineers. The Portland District is made up of some 1,100 civilian and 6 military personnel.
The 1948 Columbia River flood was a regional flood that occurred in the Pacific Northwest of the United States and Canada. Large portions of the Columbia River watershed were impacted, including the Portland area, Eastern Washington, northeastern Oregon, Idaho Panhandle, northwestern Montana, and southeastern British Columbia. A publication of the U.S. Geological Survey in 1949 stated property damage reached $102.7 million, 250,000 acres of farmland were flooded, 20,000 acres of land were damaged or destroyed, and at least 16 died in the flood ; estimates for total deaths from the flood go as high as 102. Among the damage was the complete destruction of Vanport, in the Portland metropolitan area, which was the second largest city in Oregon at the time. The flood was largely caused by rapid melting of above-average snowpack by heavy precipitation and warm temperatures. It remains the second largest flood recorded on the river.
References
- ↑ "Public Law 516-81st Congress" (PDF). U.S. Fish & Wildlife Service. Retrieved March 15, 2020.
- ↑ Columbia River Treaty: History and 2014/2024 Review (PDF) (Report). Bonneville Power Administration and the U.S. Army Corps of Engineers. April 2008. Archived from the original (PDF) on June 4, 2011.
- ↑ Priest Rapids Hydroelectric Project No. 2114 Public Utility District No. 2 of Grant County Final Application for New License, Exhibit B: Project Operation and Resource Utilization (PDF) (Report). October 2003. Archived from the original (PDF) on 2013-01-17. Retrieved 2008-10-05.
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