Planning for the Mossyrock Dam began in the 1940s but opposition from local fishers and Washington State's Fish and Wildlife Department delayed construction. During World War II, the city of Tacoma, Washington, purchased its electricity from the Bonneville Power Administration and from Seattle, with costs of up to $1 million/year. To generate its own electricity, Tacoma City Light (now Tacoma Power) built several dams, including the Mossyrock Dam. Plans for the Mossyrock Dam were announced in 1948 but met stiff opposition. The Washington State Legislature enacted a fish sanctuary on the Cowlitz River that initially blocked the project. Tacoma City sued, with its suit being raised to the US Supreme Court a total of three times. After that, construction of the dam was approved. Construction began in 1965 and ended in 1968. On October 13, 1968, the dam's power plant generated its first electricity.[2] Several towns were forced to evacuate ahead of the rising dam waters including Riffe, Nesika, and Kosmos.[5][6]
Tacoma City Light originally proposed naming the facility the "Homer T. Bone Dam", in honor of Senator Homer Bone of Tacoma.[7]
Power plantedit
The Mossyrock Dam's power plant contains two Francis turbinehydroelectricgenerators, each rated at 150 MW, or 300 MW total capacity. They are fed by three penstocks ranging from 248 – 285 feet in overall length.[citation needed] One of the three penstocks is presently unused, awaiting possible future installation of a third turbine.[8]
Power plant upgradeedit
In 2006, GE Energy was selected to upgrade the two turbines.[citation needed] The $50 million project included replacing the turbines, stators, wicket gates and transformers.[9] Installation of the first generator began in 2008; it began operation in 2009.[10] Replacement of the second generator was completed in late 2010. The power plant upgrade increased the total capacity by 70 MW, with an expected overall energy conversion efficiency of near 95 percent.[4]
^ abWilma, David (December 16, 2002). . History Link.org. Archived from the original on July 26, 2011. Retrieved July 10, 2010.
^Vander Stoep, Isabel (December 28, 2022). "Resident, Utility Clash Over Riffe Lake Amplified by Boat Launch Closures Due to Low Water Levels". The Chronicle. Retrieved June 9, 2023.
^ ab(PDF). NAES Power Contractors. Archived from the original (PDF) on September 26, 2010. Retrieved July 10, 2010.
^Mittge, Brian (June 12, 2015). "Underwater Towns of the Cowlitz River: A Look Back at Kosmos, Nesika and Riffe". The Chronicle. Retrieved October 15, 2021.
^Cowlitz River Project Statistics October 24, 2008, at the Wayback Machine, Tacoma Power
^"Tacoma Power's Mossyrock Dam up for renewable energy award". Tacoma Power. Retrieved July 10, 2010.
^(PDF). City of Tacoma. Archived from the original (PDF) on April 25, 2012. Retrieved July 10, 2010.
Tacoma News Tribune video of the Mossyrock Dam's power plant rebuild
April 11, 2024
mossyrock, concrete, arch, gravity, cowlitz, river, near, mossyrock, lewis, county, washington, united, states, reservoir, created, called, riffe, lake, primary, purpose, hydroelectric, production, while, flood, control, secondary, function, tallest, washingto. 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 1 The dam is the tallest in Washington state 3 and its hydroelectric power station supplies 40 of Tacoma Power s electricity 4 Mossyrock DamLocationLewis County Washington U S Coordinates46 32 4 N 122 25 43 W 46 53444 N 122 42861 W 46 53444 122 42861Construction began1965 59 years ago 1965 Opening date1968 56 years ago 1968 1 Construction cost 117 769 400 2 Operator s City of Tacoma 1 Dam and spillwaysType of damConcrete arch gravityImpoundsCowlitz RiverHeight606 feet 185 m 1 Length1 648 feet 502 m 1 Spillway typeService gate controlledReservoirCreatesRiffe LakeTotal capacity1 685 000 acre feet 2 08 km3 1 Catchment area1 042 square miles 2 700 km2 1 Surface area11 830 acres 4 790 ha 1 Contents 1 History 2 Power plant 2 1 Power plant upgrade 3 See also 4 References 5 External linksHistory editPlanning for the Mossyrock Dam began in the 1940s but opposition from local fishers and Washington State s Fish and Wildlife Department delayed construction During World War II the city of Tacoma Washington purchased its electricity from the Bonneville Power Administration and from Seattle with costs of up to 1 million year To generate its own electricity Tacoma City Light now Tacoma Power built several dams including the Mossyrock Dam Plans for the Mossyrock Dam were announced in 1948 but met stiff opposition The Washington State Legislature enacted a fish sanctuary on the Cowlitz River that initially blocked the project Tacoma City sued with its suit being raised to the US Supreme Court a total of three times After that construction of the dam was approved Construction began in 1965 and ended in 1968 On October 13 1968 the dam s power plant generated its first electricity 2 Several towns were forced to evacuate ahead of the rising dam waters including Riffe Nesika and Kosmos 5 6 Tacoma City Light originally proposed naming the facility the Homer T Bone Dam in honor of Senator Homer Bone of Tacoma 7 Power plant editThe Mossyrock Dam s power plant contains two Francis turbine hydroelectric generators each rated at 150 MW or 300 MW total capacity They are fed by three penstocks ranging from 248 285 feet in overall length citation needed One of the three penstocks is presently unused awaiting possible future installation of a third turbine 8 Power plant upgrade edit In 2006 GE Energy was selected to upgrade the two turbines citation needed The 50 million project included replacing the turbines stators wicket gates and transformers 9 Installation of the first generator began in 2008 it began operation in 2009 10 Replacement of the second generator was completed in late 2010 The power plant upgrade increased the total capacity by 70 MW with an expected overall energy conversion efficiency of near 95 percent 4 See also editList of dams in the Columbia River watershedReferences edit a b c d e f g h Mossyrock Dam Archived July 16 2011 at the Wayback Machine NPDP Dam Directory a b Wilma David December 16 2002 Tacoma City Light s Mossyrock Dam on the Cowlitz River generates electricity on October 13 1968 History Link org Archived from the original on July 26 2011 Retrieved July 10 2010 Vander Stoep Isabel December 28 2022 Resident Utility Clash Over Riffe Lake Amplified by Boat Launch Closures Due to Low Water Levels The Chronicle Retrieved June 9 2023 a b TURBINE GENERATOR UPGRADE TACOMA PUBLIC UTILITIES MOSSYROCK DAM CENTRALIA WA PDF NAES Power Contractors Archived from the original PDF on September 26 2010 Retrieved July 10 2010 Underwater Towns of the Cowlitz River Remembering RIFFE Mittge Brian June 12 2015 Underwater Towns of the Cowlitz River A Look Back at Kosmos Nesika and Riffe The Chronicle Retrieved October 15 2021 Cowlitz River Project Statistics Archived October 24 2008 at the Wayback Machine Tacoma Power Tacoma Power s Mossyrock Dam up for renewable energy award Tacoma Power Retrieved July 10 2010 WEEKLY REPORT TO THE CITY COUNCIL 2 April 2009 PDF City of Tacoma Archived from the original PDF on April 25 2012 Retrieved July 10 2010 External links edit nbsp United States portal nbsp Water portal nbsp Renewable energy portal Tacoma News Tribune video of the Mossyrock Dam s power plant rebuild Retrieved from https en wikipedia org w index php title Mossyrock Dam amp oldid 1193555826, wikipedia, wiki, book, books, library,
