Green River ( Duwamish River ) - wikipedia Green River ( Duwamish River ) Green River River Looking upriver from suspension bridge in Isaac Evans Park, Auburn, Washington Country United States State Washington County King Cities Auburn, Kent, Tukwila Source Cascade Range - elevation 3,283 ft ( 1,001 m ) - coordinates 47 ° 8 ′ N 121 ° 18 ′ W ﻿ / ﻿ 47.133 ° N 121.300 ° W ﻿ / 47.133 ; - 121.300 Mouth Duwamish River - elevation 57 ft ( 17 m ) - coordinates 47 ° 28 ′ N 122 ° 15 ′ W ﻿ / ﻿ 47.467 ° N 122.250 ° W ﻿ / 47.467 ; - 122.250 Coordinates : 47 ° 28 ′ N 122 ° 15 ′ W ﻿ / ﻿ 47.467 ° N 122.250 ° W ﻿ / 47.467 ; - 122.250 Length 65 mi ( 105 km ) Basin 440 sq mi ( 1,140 km ) Discharge for Auburn, Washington - average 1,316 cu ft / s ( 37 m / s ) - max 28,100 cu ft / s ( 796 m / s ) - min 81 cu ft / s ( 2 m / s ) Map of the Duwamish / Green River watershed with the Green River highlighted The Green River is a 65 - mile ( 105 km ) long river in the state of Washington in the United States, arising on the western slopes of the Cascade Range south of Interstate 90. The upper Green River valley forms the western approach to Stampede Pass, and was once home to many small railroad and logging towns such as Weston, Lester, Green River Hot Springs, Nagrom, Maywood, Humphreys, Eagle Gorge, Lemolo, and Kanaskat. Shortly before World War I, the City of Tacoma, Washington, filed for water rights on the Green River. Today, much of the upper valley has become a gated water supply watershed for Tacoma and access is heavily restricted, creating controversy among recreation enthusiasts. Between 1880 and 1888, the Northern Pacific Railway explored and surveyed the Green River. The railway constructed the first direct rail link across Washington 's Cascade Range with the opening of their Stampede Tunnel in 1888. Contents 1 History 2 Course 3 Green River Killer 4 See also 5 References 6 External links History Maps showing the changes of course and nomenclature of rivers in the Duwamish Valley, 1899 - 1959. Until 1906, the Green River flowed into the White in downtown Auburn. In 1906, however, the White River changed course above Auburn following a major flood and emptied into the Puyallup River as it does today. The lower portion of the historic White River -- from historic confluence of the White and Green Rivers to the historic confluence with the Black River at Tukwila that forms the Duwamish -- is now considered part of the Green River. Then, with the opening of the Lake Washington Ship Canal in 1916, the lake 's level dropped nearly nine feet and the Black River dried up. From that time forward, the point of the name change from Green to Duwamish is no longer a confluence of rivers, though it has not changed location. Thus, the Green River now becomes the Duwamish River, flowing into the industrialized estuary known as the Duwamish Waterway and thence Elliott Bay in Seattle. By contrast, the White turns south at Auburn, and flows into the Puyallup River and later Commencement Bay in Tacoma. In October 2009, giant sandbags were placed along the levee from Fort Dent through Kent and the Green River Trail was closed to cyclists. The sandbags mitigated the flood potential due to a weakness discovered in the Howard A. Hanson Dam following a January 2009 storm. Repairs strengthening the partially earthen dam by the Army Corps of Engineers have reduced this flood threat significantly. In September 2012, the Green River Trail was reopened following the removal of all giant sandbags. Course Most of the river above and including Eagle Gorge Reservoir are part of the Green River Watershed, which is closed to public access, creating controversy among recreation proponents for some time. West of the Green River Watershed at Kanaskat, the river passes through the Green River Gorge with cliffs rising sharply as much as 300 feet ( 91 m ) from the riverbed. Flaming Geyser State Park, Nolte State Park, and Kanaskat - Palmer State Park are located in this area. The river is a popular tubing spot in the Summer. Downstream from the Green River Gorge is the half - mile wide Green River Valley, where farmland has been protected from development. An attempt to locate a bike trail along the valley walls has encountered fierce resistance from farmers. As a result, bikes must share the road with autos as it winds through the pastoral landscape. At Auburn, the Green River emerges from the Green River Valley and enters the much larger Auburn / Kent Valley, which was created by glacial action during the Pleistocene ice ages, then filled in by river sediments and lahars from Mount Rainier. After flowing generally west from its source, at Auburn the river turns north, entering a zone of light - industrial and retail development. A public multiuse trail runs along the river through most of this valley. Green River killer Main article : Green River Killer The Green River is infamous as the location where the first victims of serial killer Gary Ridgway were found in the early 1980s. Most of these victims were prostitutes that worked an active `` stroll '' along Pacific Highway South. Although only a few bodies were found in the river, the unidentified killer was known as the `` Green River Killer ''. These murders went unsolved for over 20 years. For many years, Dave Reichert led the investigation as a detective of the King County Sheriff 's Office. Ridgway made a plea agreement with King County Prosecuting Attorney Norm Maleng to cooperate with police in order to escape execution. In November 2003, Gary Ridgway pleaded guilty to 48 counts of Aggravated First Degree Murder. King County Superior Court Judge Richard A. Jones sentenced Ridgway to 48 consecutive life sentences. Ridgway will never be eligible for parole. See also List of rivers in Washington Patton Bridge ( Auburn, Washington ) References Jump up ^ Google Earth elevation for Green River source coordinates. Retrieved April 20, 2007. ^ Jump up to : USGS ; U.S. Geological Survey Geographic Names Information System : Green River ; retrieved April 20, 2007. Jump up ^ Google Earth elevation for Green River mouth coordinates. Retrieved April 20, 2007. ^ Jump up to : USGS ; Water Data Report WA - 05 - 1, file : Duwamish River Basin ; retrieved April 20, 2007. Jump up ^ `` The Green - Duwamish : A River System Re-Plumbed '', The Green - Duwamish River : Connecting people with a diverse environment. Duwamish River Cleanup Coalition / TAG. No date, appears to be 2008 or 2009. Jump up ^ `` Green River Trail in Kent to close -- making way for giant sandbags ''. Kent Reporter. October 6, 2009. Retrieved 6 October 2010. Jump up ^ `` All sandbags removed in Kent along Green River Trail ''. Kent Reporter. September 24, 2012. Retrieved 15 November 2015. Jump up ^ `` Green River Regional Trail ''. Archived from the original on 2006 - 07 - 18. Jump up ^ `` Home of the Green River Killer Information Pages ''. Jump up ^ Guillen, 2007. Jump up ^ `` Green River Killings ''. Seattle Times. Jump up ^ `` Aggravated First Degree Murder : RCW 10.95. 020 ''. Jump up ^ `` Sentence for Aggravated First Degree Murder : RCW 10.95. 030 ''. Guillen, Tomas ( 2007 ). `` Serial Killers : Issues Explored Through the Green River Murders '', Pearson Prentice Hall, New Jersey, 2007. External links Wikimedia Commons has media related to Green River ( Washington ). Green River flows and forecasts Interurban / Green River Trail U.S. Army Corps of Engineers website : Howard A. Hanson Dam and Reservoir Historylink essay : Howard A. Hanson Dam Historylink essay : Howard A. Hanson Dam Howard Hanson Dam & the Green River : Depicting the Flood Risk ( video ) Retrieved from `` https://en.wikipedia.org/w/index.php?title=Green_River_(Duwamish_River)&oldid=814902071 '' Categories : Rivers of Washington ( state ) Rivers of King County, Washington Hidden categories : Coordinates on Wikidata Geobox usage tracking for river type All articles with unsourced statements Articles with unsourced statements from April 2007 Talk Contents About Wikipedia Cebuano Español Français 日本 語 Русский Edit links This page was last edited on 11 December 2017, at 16 : 14. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: where does the green river start in washington
Answer: Cascade Range